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annual report 1976

institut max von laue • paul langevin 156X38042 grenoble cedexfrance tel.(76)9741-11

a W f U w i '

table of contents

EXTERNAL ORGANISATION OF I.L.L Page 4 INTERNAL ORGANISATION OF I.L.L. 1976 6 THE INSTITUT LAUE-LANGEVIN 7 SECRETARIES OF STATE VISIT I.L.L S GENERAL REMARKS ON THE INSTITUTS ACTIVITIES 1976 . . . 9

INSTRUMENTATION Introduction 15 Operating Statistics and proposed instrumentation 20 Instruments which became operational in 1976 24

INSTRUMENT GROUPS Three-axis 27 Time of flight 32 Diffuse scattering 37 Diffraction 40 Nuclear physics 48 Monochromators 54 New techniques 57

COLLEGES 59

Map showing the origin of experimenters in 1976 60

College 2 : Theory 61 College 3 : Fundamental and Nuclear Physics 64 College 4 : Excitations 68 College 5 : Structures 75 College 6 : Liquidsé gases and amorphous materials 78 College 7 : Impurities 82 College 8 : Structural biology 85 College 9 : Chemistry 87

European Molecular Biology Laboratory 90

«SW*S»>(RW!,tf!

TECHNICAL SERVICES 92 REACTOR OPERATION AND INSTRUMENT SUPPORT SERVICES 98 COMPUTING SERVICES 106 ADMINISTRATION 111

INFORMATION 1976

Publications by code number 121 Publications by author 138 Theses presented 147 Conferences at I.L.L 148 Experiments performed 149

I

I

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%^^^mm.

if

View of Gi «noble towards the Belledonne range, with the I LL in the fureground.

external organisation of the institut laue-langevin 1976

associates of the institut

great britain

SCIENCE RESEARCH COUNCIL (SRC)

trance COMMISSARIAT A L'ENERGIE ATOMIQUE

(CEA)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)

west germany

GESELLSCHAFT FUR KERNFORSCHUNG KARLSRUHE (GfK)

steering committee (at its last meeting)

L. Hobbis J. Winter - (CNRS) L. Genzel '•*

B. Fender .1. Paton

P. Crayssel J. Horowitz

- (CNRS) Vice-Chairman • (CEA)

W. Hofbauer W. Menden Chairman

M. Robins Chairman M. Pascal - (CEA) W. Kiose

audit commission

scientific council (at its last meeting)

r A. Abragam - CEN Saclay J. Enderby — Univ. Leicester V. Luzzati - CNRS, Gif-sur-Yv. ^ G. Allen — Univ. Manchester E. Fischer — Univ. Mainz H. Maier-Leibnitz — Dt. Forschungsgemeinsch., Bonn E. Bertaut - CNRS Grenoble A. Guinier - Univ. Paris Sud E. Mitchell — Univ. Reading H. Bilz - MPI Stuttgart W. Hoppe — MPI Martinsried R.Môssbauer — 1 .L.L.— Chairman E. Bradbury — Portsmouth P. Kienl.e — TU Mùnchen H. Stiller - KFA Julicrr

Polytechnic W. Klose - Gf K Karlsruhe T. Waddington — Univ. Durham k R. Elliott — Univ. Oxford J. Lascombe — Univ. Bordeaux J. Yoccoz - IN 2 P 3, Paris

SUBCOMMITTEES OF THE SCIENTIFIC COUNCIL

Structures '

Phys. Chemistry (Crystallogr.l Liauids Nuclear Physics Imperfections Excitations Biochemistry Instruments

Allen Bacon Dransfeld Armbruster Fender Bilz Berkaloff Alefeld Benoit Benaui Enderby Gelletly Friedel Coles Bradbury Bertaut Fischer Collongues Guinier Kienle Mitchell Comes Blow Cribier Jannink Dachs Hertz Moussa Ou ere Cribier Holmes Glaser Lascombe Jagodzinski Powles Smith Seeger Glà'ser Hoppe Mitchell Leadbetter Stiller Waddington Wilke

Thomas Weiss R. Weiss Armin Willis Structures (Magnetic)

Rigny Yoccoz Zittartz Lowde Luzzati North Stuhrmann Witz

Rouit Waddington

Leadbetter Stiller Waddington Wilke

Thomas Weiss R. Weiss Armin Willis Structures (Magnetic)

Rigny Yoccoz Zittartz Lowde Rouit Waddington

same members

Ol

aifss"!*! 1 »*? w ^ ^ g a » ^ ^

05 internal organisation of the institut laue-langevin at 1.12.76

SCIENCE BOARD ' J. Brown B. Dorner T. von Egidy

B. Jacrot J. Joffrin J. White R. Mossbauer

4

DIRECTORATE R. Mossbauer • Director J. Joffrin Co-Director J. White Co-Director MANAGEMENT BOARD

J. Joffrin M. Jacquemain J. White R. Mossbauer A. Plattenteich

COLLEGES (College Secretaries)

COLLEGE 2 THEORY J. Loveluck

COLLEGE 3 NUCLEAR PHYSIOS M. Asghar

COLLEGE 4 EXCITATIONS W. Stirling

COLLEGE 5 STRUCTURES S. Mason

COLLEGE 6 LIQUIDS, GASES AND AMORPHOUS MATERIALS P. Chieux

COLLEGE 7 IMPERFECTIONS A, Heidemann

COLLEGE 8 BIOCHEMISTRY J. Zaccai

COLLEGE g CHEMISTRY S. Howells

INSTRUMENT GROUPS

3 AXIS SPECTROMETERS [ B. Dorner) NUCLEAR PHYSICS INSTRUMENTS AND SPECIAL BEAM EXPERIMENTS

(T. v. Egidy) DIFFRACTOMETERS

(J. Brown) DIFFUSE SCATTERING AND TIME OF FLIGHT SPECTROMETERS

(B. Jacrot) MONOCHROMATORS

(A. Freund)

SERVICES

TECHNICAL, SAFETY AND HEALTH PHYSICS SERVICES

M. Jacquemain

REACTOR OPERATION AND INSTRUMENT SUPPORT SERVICES

Y. Droulers

COMPUTING SERVICES D. Rimmer

ADMINISTRATION A. Plattenteich

SCIENTIFIC SECRETARIAT AND LIBRARY

PROJECTS OFFICE J. Faudo-j J

The institut max von iaue-paul langevin The Institut Max von Laue • Paul Langevin (ILL) at Grenoble was formally founded in January 1967, with the signature of an intergovernmental convention between France and the Federal Republic of Germany. The aim was to provide the scientific community of the affiliated countries with a unique neutron beam facility applica­ble in fields'such as the physics of condensed matter, chemistry, biology, nuclear physics and materials sciences. The construction of the Institut and its high flux reactor was undertaken as a joint French-German project, with a total capital invest­ment of 335 million FF. The reactor went critical in August 1971 and reached its full power of 57 MW for first time in December 1971. The year 1972 saw the start-up of the cold and hot sources, the first instruments and the beginning of the experimental programme. On January 1,1973, the United Kingdom joined the Institut as a third equal partner, contributing its share to the total capital investment. The correspon­ding intergovernmental convention was formally signed in July 1974 by the pertinent ministers from the three affiliated countries.

The ILL is a non-trading company under French civil law. The three countries are re­presented by the following Associates :

— Gesellschaft fur Kernforschung mbH Karlsruhe, Germany — Centre National de la Recherche Scientifique, France — Commissariat à l'Energie Atomique, France — Science Research Council, United Kingdom These Associates are represented on a Steering Committee, which establishes the general rules of the management of the ILL. The Institut is headed by a Director and two Assistant Directors, all with a five year tenure, the former to be nominated alternately by the German and the British Associate, the other two by the remain­ing Associates. A Scientific Council, nominated by the Associates, advises the Directors on the scientific programme and on practical aspects relating to its opera­tion.

The scientific user's community of the ILL is represented in 8 Subcommittees of the Scientific Council, which meet twice a year to select those research proposals which are to be carried out at the neutron beam facilities of the I LL. A further Subcommit­tee of the Scientific Council deals with questions of instrumentation, serving as a discussion platform between the ILL and its external users. The purpose of the ILL thus differs fundamentally from most other research insti­tutes. It is a central facility created so that chemistry, physics, biology and metal­lurgy specialists from laboratories in the partner countries can use the unique power of neutron techniques to broaden the attack on their problems. Designing and ope­rating instruments and helping the visiting users to carry out their experiments is thus the principal task of the Institute's own scientists. The experimental use of the instruments by ILL staff is subject to the same approval system as their use by exter­nal teams.

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<Jù ;;ILS.....W SECRETARIES OF STATE VISIT ILL

In 1976 the Institut was visited by the Secretaries of state responsible for research in two of the three member countries. In January Mr. Fred Mulley, the British Secretary of State for Education and Science, spent a day at the ILL during which he visited the Reactor and talked to a number of members of staff. On 4 March Dr. Volker Hauff, the German Parliamentary Secretary of State at the Federal Ministry of Research and Technology, also toured the Reactor operating area and experimental halls. The photographs show Mr. Mulley in the Reactor Control Room and Dr. Hauff being shown the triple-axis spectrometer IN2.

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14

Instrumentation

introduction The instrument construction programme continued vigorously in 1976, subject to the limits of finance and staff. Only one new instrument was finished but four should be completed in 1977. The development of a number of instruments at the ILL since the start of normal reactor operation is shown in Figure 3, which also reflects the fact that the number of instrument positions is approaching saturation. This is particularly true for instruments which need cold neutron beams. There is a growing demand in this area and the only alternatives open, apart from constructing another cold source (which is being studied In connection with the long-term scientific future of the ILL), are to increase the utilisation of existing beams and to shut down some instruments.

t , NUMBER OF OPERATIONAL INSTRUMENTS

30 , , 28 £.7

24 z

20

OF

NORM

AL

IR O

PERA

TIO

n - £5 fl

>f 5

il ' III $& YEAR >> 1971 1972 JAN. JAN. JAN. JAN. JAN.

1973 1974 1975 1976 1977

Fig. 3 Development of the number of operational instruments.

T" ^wTC'-^r-y^^^rw-'J^i^.^a^SgaîM^S

Jj^fntMbe arrangement and instruments at the HF.R.of the LL iS f

—".—-• "» ~ - — •• n.^vwnii.ii

The operation of the instruments has been generally satisfactory because of con­tinuous investment in them, although many instruments are now showing the effects of hiving been designed and built for approximately five years. For example, the speed of movement of many instruments suffers, not only because of crowding on the central control computers CARINE and NICOLE, but also because of the mechanics used, relays due to the computers have been reduced by re-arrangements and by giving some instruments into dedicated computer control, and the new NICOLE replacement will help in this respect. A new type of mechanical drive Is being developed for IN12.

New instrument groups were formed in 1976 in order to facilitate improvements and operation of the existing machines. Each croup is headed by a Senior Scientist and assisted by a Group Coordinator, and in come cases an Engineer has been attached to a new group. The Central Group, created in 1S75, has continued to work well, but because of the considerable lack of technicians, many of the rpem-bers of it have had to work for long periods attached to given instruments during 1976.

The demand for time on instruments at the ILL has continued to increase and Figure 4 shows a breakdown of the requested and allocated days on different instruments during 1975 and 1976. The pattern shows a strong interest in all areas, with particularly high over-subscription in the inelastic scattering and nuclear physics areas. In addition to the growth of scheduled experiments, an increased

number of test experiments has b6v.n encouraged in response to requests from a number of Subcommittees of the Scientific Council. On some instruments definite periods of time for test experiments have been set aside and these also give some flexibility for experiments on samples which deteriorate rapidly etc.

One area which has grown considerably is the area of special beam experiments. These experiments usually stay at the ILL for many months and some of the activities going on are summarised in the tables whtah follow. It is expected that this class of experiment will grow and, as a result, special funding arrangements may have to be made since the cost for each experiment is much greater than for the other types of experiment at the ILL.

New instruments at present in the planning stags meet both the criterion of in­novation from the point of view of technique, and satisfaction of demand in the most over-loaded areas. The ILL will continue this policy of instrument develop­ment and some of the details are summarised in the annexed tables.

•H 17

S î 8 OHE CF SCENTFIC COUNCIL

Fid. 4 Development of the number of instrument days used for experiments during the last 2 years of reactor operation.

H 18

,. . . , t . . . l r . - . * - „ . ,L.*.ii,~..* • • ^ • - ^ ^ ^ . ' 1 . - ^ _ • • - = * - - " * — " • - - - - ^ ^

A cutaway view of the reactor and some of the associated beam tubes

19

INSTRUMENT OPERATING STATISTICS

THE REACTOR HAS OPERATED FOR 2G2.4 DAVS DURING THE YEAR.

(5.1 days were recuperated by

Instruments Total operating timt (days)

Loss of beam tin» (days)

Coil. Coll. 4

Coll. 5

Coll. 6

Coll. 7

Coll. 9

Coll. a

Inttrnal test.feasibility. and instrument improve ment experiments.

INI 231.1 313 73.1 25.8 '53.6 48.8 29.8 IN2 234.9 27.6 180.7 21.9 223 7.6 2.0 IN3 203.0 69.4 116.4 47 6 22.B 17.2

IN4 233.7 26.7 10.8 31.9 82.9 39.7 18.5 IN5 212.8 49.6 22.9 85.3 34.2 69.5 1.0 IN7 127.2 136.2 3.7 14.0 104.5 IN8 231.6 30.8 136.3 6.9 12.3 6.4 17.7

INIO 224.7 37.7 36.6 313 47.7 17.5 74.4 17.2

D1A 2545 7.6 201.1 3.0 63 44.5 OtB 247.5 14.9 129.7 14.7 47.7 65.4 D2 241.9 20.5 160.2 43.8 47.9 D3 190.7 71.7 171.7 19.0 D4 249.7 12.7 220.9 6.0 22.8

D5 237.3 26.1 16.2 1273 58.2 356

D6

D7 1792 B3.2 2.7 10.0 133.7 32.8

DS 211.7 60.7 81.8 121.1 8.8

D9 232.7 29.7 159.9 19.9 52.9

DIO 231H 31.4 103 165.7 5.0 60.0 J

D11A 233.1 293 63 19 J} 593 94.9 43.2 10.4 |

D11B 1

012 i DI3 2445 17.9 244.5

DIS 99.7 33.2 94.1 46

016 171.9 90.5 60.7 87.2 3.0 21.0

017

PN1 210.0 62.4 185.0 25.0

PN2 230.0 32.4 220.0 10.0. \

PN3 <G1> 237.8 24.6 231.6 6.0 .'

PN3 (G2/3I 172.2 90.2 100.2 12.0

PN4 433 483

PN5 .

\ 20

(JANUARY TO DECEMBER 1976)

|? 6.7 DAYS WERE AFFECTED BY UNSCHEDULED SHUT-DOWNS

H extending the operating cycle)

Instrument out of commission for modification* until 7/2/76

L o » of beam lime includes chopper end guide replacement

Instrument mod If icetlon end uprating in progreu. Daley» due to counter housing manufactun diffieuitiai.

18.0 days of effective beam time Ion due to a computer fault

Lou of beam time includes 14 days for instillation of new shielding

Instrument modification* end tests continued until September 1976

Loss of beam time includes changing instrument mode to polarised neutrons

Loss of beam time mainly due to control computer (CA3INE) difficulties

Test time includes commissioning of 4 circle closed loop cryostat

Continuation of instrument test and calibration programme

14 approved experiments earned out - Instrument to be fully scheduled from January 1977

61 experiments carried out • crystal m o w c spread, reflectivity, topography, etc.

Full scheduling commenced 21/6/76

During 1976 this instrument was out of commission for 1.5 reactor cycles- modifications

Programme of commissioning experiment* in progress

_ Operational time includes decay measurements during shut down period. Loti of beam time includes 21 days for source changing modifications

__ . Loss of beam time includes 1 reactor cycle for PDP-11 replacement and 21 days for source changing modifications

_ Use restricted by experimental requirement and positioning of PN3 (G.11

_ Installation proceeding-commissioning w.a.1. April 1977.

v-j-21

TABLE II • PROJECTS IN PROGRESS (1976)

IN12 Conventional triple axis spectrometer on e cold neutron guide. Completion o l the mone^romator assembly and Tanzboden was «fleeted during 1976 am] It Is expected that preliminary evaluation experiments wilt com­mence in October 1977.

IN9 Time-of-flight spectrometer with poljrfwd proton filter. The development of this instrument re-commenced in May 76 after being moved to • permanent position taking a watte beam from IN10. Polarization by the filter is 90% with a transmission of 45% and 2% for parallel and anti-parallel spins respectively. Electronic «ability and reliability have been increased during 1976 following die loan of equipment from the Rutherford Laboratory. Development work is continuing.

IN11 During 1976 work continued to complete the mechanical installation of this Instrument. Software and computer control requirements were also completed. Tests were continued during the year an the development of pola­rised beam benders and the final version resulting from this work will be installed in February 1S77. Conse­quently the f lnt spin-echo tens will commence in the Spring of 1977.

D11B This small angle and diffuse scattering spectrometer is mechanically operational. Oetecjori and electronics linked to the PDP 11/40 have been successfully tested and software development has continued. Cryostat and sample changer, developed by ILL / Rutherford Laboratory, have been tesiad. Further extensive tests ere conti­nuing.

D18A The construction of this neutron interferometer continued during the y*v. An X-ray beam has been incor­porated into the design and will be used for alignment purposes. The instrument will be operational during the course of 1977.

PN5 The installation of this ultra-cold neutron source continued during the year. Tne external guides have been tested and the in-pile section is ready for installation. The completed facility should be ready in May, 1977 end will have 3 measuring positions.

TABLE III - PROJECTS UNDER DEFINITION

IN 106 The scientific and technical definition of this instrument is now complete. Experimental conditions envisaged ere as for the present IN10 . Further progress on this protect is dependent upon the budgetary situation.

IN13 This backseatterhtg spectrometer with an anergy range up to 200 ueV is now fully defined. Further progress on this project H alto dependent upon the budgetary situation.

D I S S Polarised neutron version of the neutron interferometer.

I N 5 8 This proposal, for a new high resolution time-of-flight spectrometer, was submitted to the Instrument Sub­committee of the Scientific Council in October 1976. Work b continuing on the scientific definition and siting of this instrument.

TABLE IV - SPECIAL PROJECTS

Polarisation Devices

D19lmulttdetector)

Monochromators

Development work on new lechnlqu. for producing polarised neutrons hat been concentrated in two areas : supermkror polariser* and polarising baam benders. Wïiih the former davica, a polarisation efficiency of batter than 99% has been achieved, whilst the joint I LL/Rutherford Laboratory project to construct a polarised btam bander lor 1N11 hat resulted in the successful testing of tht prototype version. The manu­facture of two definitive benders for IN11 Is almost complete'

Construction of this 2-dimcnslonal multidetecior was started in 1976 after feasibility studii. in mid-1975-With 512 horizontal and 16 v M lie* I aliments in high pressure •'He pas it wiH have good resolution and ef­ficiency at retathreiv thort wavelengths, and will be used for high resolution protein crystallography « well as for biological and chemical problems.

With its own data coUuction end processing system, 0 1 9 will be used from aarly 1978 as an autonomous

unit on Iha existing diftractometeri D8, D9 and D16.

During 1976 maximum effort was concentrated on monodiromators for long wavelength neutrons, resulting In iha production of Ge and Si crystals showing considerable improvement. In addition, the anisotropic mosaic spread can be controlled during production. A joint project by the M J M . r Stuttgart and I L L to develop and produce good quality Béryllium single crystals was commenced during the year and has already shown promising results.

TABLE V - SPECIAL EXPERIMENTS

Instrument Beam Experiment Ti t le Position Number

S 4 H 1 8 L 03 03-010 Magnetic moment of the neuiron

3 6 H 2 6 U 07-04-002A In-Oeam N.M.R. (03-03-052 <n, p ) , (n , a ) in n-def icient nuclei

S 10 H 2 2 W J03-03053 ( n , a l , ( n , 7 a ) in medium and heavy nuclei |o3-03-054 (n , a 1. (n , 1) of heavy isotopes

S 13 H 1 7 U / M 06 02-009 He surface S 20 H 2 4 W 07-03-045 Neutron Topography

5 21 H 2 4 W 05-01-100 High precision lattice parameters

S 2 2 I H 3 03-03-008 Neutron bott le (ultra cold neutrons)

S 2 3 I H 3 03-03-007 Neutron Storage ring (ultra cold neutrons)

S 2 S H 22 M 03-03-011 Protein content in seeds

5 2 8 H 2 3 L 0303-015 Isotope separator - OSTIS S 30 H 25 M 03-04-001 Concentration profiles by (n , a ) and ( n , p) reactions S 32 H 14 (special) 01-003R h/m determination

S 3 3 H 14 03-03-018R ga/gv f r o m free (îdecay S 3 6 H 14 03-03-037 Parity violat ion in < 1 4 C d « n d f 'OSn .e t c . S 37 H 18 03-03-038 Neutron half l i fe

I 03-03-054 I n , a ) and I n , f ) o f heavy isotopes

S 3 8 I H 1 < 03 -03-055 Mass distr ibut ion for 231 p a # 2 3 7 f j p („_ f ) reaction

{ 03-03-060 Emission o f 2 l ight particles in 235t j ( n > f )

8 3 9 H 2 2 W 03-03-066 One and t w o phonon decay in n + 3 H e capture (03-03-058 103-03-059

7-directionaI distr ibut ion f rom oriented nuclei S 31 H 2 2 U

(03-03-058 103-03-059 7-7directional correlation after n-capturo

S 4 0 No beam requirement)

03-05-001 Neutr ino cross-section and neutr ino oscillations

S 41 03-05402 PNC effects in polarised neutron optics S 4 2 H 2 5 W 5-16-51 Change of domains in Of e ^

instruments which became operational in 1976 THE LOW-q, HIGH R E S O L U D O M SPECTROMETER D17

D17 is a 2-'axis spectrometer, with multidetector, for scattering experiments in the scattering vector (q) range 5.10"3 A ' 1 ic i.O A 1 , requiring high resolution. It is thus designed for studying high order diffraction peaks of large periodical structures. It can also be operated as a classical small angle scattering spectro­meter and will take in charge part of the small angle scattering experiments cur­rently carried out on D11, an apparatus, up to now, heavily overloaded.

.a -"" - ' ; '

r mi UM

D17 : new small-angle scattering ins-

j trurrwnt

24

D17 is equipped with a LET! BF3-multidetector, 64 x 64 cm 2 in area, with 16000 counting cells each 5 x 5 mm 2 , in a planar X, Y arrangement. This detector is positioned 3 m from the sample and can be rotated around the sample from 0°to 90° from the incident beam direction. The detector can also be placed at 1.5 m from the sample. The incident beam as well as the scattered beam are in vacuum, except for a few centimetres around the sample.

The apparatus is installed at the exit of the cold neutron guide H17 with a beam cross-section size of 3 x 5 cm2. Because of the rather strong curvature of the H17 guide, the range of available neutron wavelengths is restricted to 7.5-30 A. The beam monochromatization is made by velocity selectors'. A first selector already running gives a wavelength resolution AX/X of 10%. A 4% selector will be available in January 1977.

The q resolution Aq, of the apparatus is in a first approximation simply propor­tional to q.AX/X at high scattering angles. At low angles, q depends on the col-limation of the incident beam. A lowest reasonable limit is nevertheless 2 x 10 - 3 A ' - The divergency of the incident beam can be varied between 2.10' 2

rad. and5.10'3rad.

Some ancillary equipment is available : a sample table with a 360°monitored rotation, and a monitored translational sample changer ; a cryostat (4 K to

150 K) with a vertical magnetic field (0 - 20 KCe) ; a chopper allows easy wave­length calibrations and eventually some time-of-flight analysis of the scattered beam, with low energy resolution.

D17 is equipped with a PDP11-40 computer for controlling the experiments and collecting the data. Some data reduction treatment and display are possible on measured spectra. The computer is programmed in FORTRAN.

D17 will be operational for external users in Spring 1977. Some preliminary experiments have shown that the available intensity on the sample at 12 A is very similar to that at D11 for the same collimation, and is higher for longer wavelengths.

To exemplify the resolution and the possibilities of the apparatus. Figures 5 and 6 show the scattering pattern and equatorial intensity obtained after 1 h measure­ment with the 10% AXA resolution on a sample of aligned collagen/D20 fibres. Collagen has a highly crystalline one-dimensional periodical structure with a period of repeat of 668 A. Peak overlapping dr 3 to AX smearing appears beyond the 7th order of diffraction.

HNTEN5ITY

Fig. 6 Intensity scattered by collagen at a function of the icattaring vector in the equatorial plane.

SCATTERING VECTOR

26

instrument group ^three-axis spectrometers^

IN1 IN2 IN3 IN8 IN12

on the hot source (beam tube H8) on thermal beam-tube H13 on guide lube H24 On thermal beam-tube H10 under construction on cold guide H142.

During the year 1976 the instruments IN I , IN2 and IN8 have been in continuous operation, while the construction of IN12 was in progress. As a result of the new instrument group structure, the spectrometer IN3, with much improved capabilities, is now part of the three-axis group.

No major modifications to the other existing instruments was undertaken.'It is generally felt that a significant move towards improved instrument performance should begin with the replacement of the present Carine system ; but so far the outlook has been rather unpromising.

Nevertheless, an effort at simplifying the control hardware through a more sys­tematic use of stepping motors is currently underway and will be implemented on IN12.

IN1 - HOT SOURCE 3-AXIS (J.R.D. Copley and J. Tomkinson) Over the past year, considerable improvements to the radiation safety aspects of the instrument have been completed, with the installation of two 6 LiF beam shutters and a displaceable beam-stop. Essential mainenance work has included the replacement of the cables to the monochromator table and the installation of a new motor to rotate the mono-chromator drum (both items have been the source of frequent instrument break­downs in the past). As a result variable E 0 scans no longer present mechanical problems.

We have acquired a good beryllium crystal which is frequently used as an analyser. The beryllium filter analysing system continues to operate satisfactorily and has been used during approximately a third of the available beam time. Some users would like to see the possibility of improved incident energy definition at the obvious expense of intensity. This would be achieved if higher take-off angles 2 0 M . were available : however, the corresponding modification would not only affect INI itself but also the use of D4 and this for a considerable length

27

of time. Such a step will therefore require a careful discussion and a scientific choice.

IN2 - THERMAL BEAM 3-AXIS WITH A DOUBLE MONOCHROMATOR (B. Dorner, R. Ghosh, and B. Fitzgerald) Apart from the usual Carine problems, IN2 has been running satisfactorily all year. It is used more and more in the fixed incident energy (14 meV), up-scat­tering mode with pyrolytic graphite as monochromator and analyser crystals. Since it is well adapted for the study of low-frequency excitations, an important fraction of the experiments performed on the instrument have to do with dyna­mical studies near phase transitions. For soft phonon mode measurements the large range of available scattering angles around the sample tabla is often very useful.

Changing sample temperature on INZ

For the future a project for a new version of the instrument sharing the H13 beam with a new back-scattering machine (IN13) is presently under study.

IN3 - FOCUSING TRIPLE AXIS SPECTROMETER ON THE GUIDE TUBE H24 (R.Scherm, V.Wagner) At the end of 1975 IN3 has been shut down for 4.5 months to undergo a major reconstruction (G. Gobert, M. Laroumagne, R. Ritter).

28

As a result of this overhaul the position is as follows : 1. Precise, backlash compensated positioning of the angles. 2. On an optical bench system collimators, filters, diaphragms, monitors and the

neutron camera can be placed quickly and reproducibly without any need for realignment.

3. Mylar foil collimators, purchased from the Rutherford Lab. give excellent transmission.

4. A newly designed analyzer shield using Gd-painted curtains allows the de­tector to sweep its full angular range automatically with no one needed .to rearrange shielding blocks.

5. In October 76 the automatic monochromator shielding was installed (H. Beaujard, G. Gobert, P. Tardif). Finally now even IN3 can vary the incident energy automatically.

6. A new vertically curved Cul 11 monochromator has been installed (A. Freund, H. Hustache) : it has increased the flux by a factor 2.S :

E| Cu111 Graphite 002

1.2 THz _ 8.5 x 10s

3.5 0.27 x 10' 1.5 xlO 7

5.3 0.55 x10 7 2.0x10? 8.4 |

1x10 7

10.0 THjj

7. Last but not least new programs (F. ReichI, P. Rice, W. Kaiser, V. Wagner) have been written to perform faster and partially automated alignment procedures.

IN3 resumed scheduled operation on February 7 1976. Thanks to the modi­fications described above,the spectrometer has become a very versatile ins­trument. Resolution can be adapted quickly to the experimental needs both in the classical and focusing mode of operation. The time wasted for alignment is reduced to a few hours.

Except for the steady complaints about the slowness and frequent break­downs of the Carine computer end electronics the instrument is now ope­rating very satisfactorily.

Monochromator assembly on IN3

IN8 - THERMAL BEAM 3-AXIS (R. Currat, R. Pynn and C. Escribe) INS has been in high demand all year because of its high flux and low background, particularly in the medium energy transfer range (5 to 15 THzl. The instrument is now fully equipped with graphite and beryllium filter supports on the incident and scattered beams. Improvements to the monochromator-drum drive unit, sample goniometer and beam stop are underway. A variable vertical curvature device installed at the monochromator position has been tested using a 15-piece pyrolytic graphite assembly. The flux gain, as mea­sured on a small sample, is a factor of 2.S at all attainable incident wavelengths (1.5 to 4 ÂÏ. Similar developments are in progress using Copper and Germanium crystals.

IN12 - 3-AXIS ON A COLD GUIDE (W. Stirling) Construction of this instrument is under way with the monochromator to be assembled and in position during January 1977. First tests of the complete ma­chine are scheduled for Summer 1977, although the shortage of electronic staff may hinder the final commissioning. It is unlikely, therefore, that IN12 can per­form scheduled experiments next year.

30 Co-ordinator : Ft. Currat

f -

ÎN8 Monochro-mator assembly with the variable vertical curvature apparatus.

31

I l

S fully operational

instrument group NNtime of flight^ This group covers the following instruments : IN4 'Rotating crystal spectrometer on thermal beam-tube H12 IN5 : Multi-chopper spectrometer on the cold source H16 IN7 'Double monochromator + Fermi chopper spectrometer on the thermal

beam tube H15. IN9 Polarized proton filter on cold guide H14 IN11 Spin echo spectrometer on cold guide H14.

IN4 - ROTATING CRYSTAL SPECTROMETER (J. Suck, C. Carlile) The instrument was operational throughout the year performing 32 experiments in 1976. While last year the shielding of the spectrometer building was completed, in 1976 considerable effort was made to reduce the background coming from the ins­trument's own beam : the flight path is now covered with Cd ; scattering from the cryostat was reduced. The background coming from gas scattering within the secondary spectrometer was partially improved by a beam stop nearer to the sample. To reduce the background further, it is planned to install coarse Cd col­limators in front of the detectors.

The installation of a lifting table now allows the installation of heavy equipment on the sample site. Two furnaces (670 K with good temperature homogeneity and T < 2000 K) will soon be available. The control of the cryostat has been further automated.

A new Fermi chopper was installed and tested up to 15000 RPM. Flux and reso­lution have been studied for the graphite and Cu monochromator ; a comparison of the performance of the rotating crystal with the Fermi chopper is under way.

To overcome the intensity problems the addition of new detectors is planned for 1977.

IN5 - MULTICHOPPER SPECTROMETER (R. Lechner, A. Oianoux, F. Douchin) After a series of tests the IN5 choppers have been running regularly and reliably at 15000 RPM since April 1976. Tests are continuing in order to allow quick changes of the chopper speed. This would allow the user to rapidly adapt wave­length and resolution to physical problems. The range of stable operation of chopper 3 has been extended down to 1666 RPM. This permits the use of

X = 15 A to achieve S ueV resolution at Q < 0.8 A - 1 . The flux at the sample increased by 30% as a consequence of a realignment of the neutron guides between the choppers. The cause of the misalignment (unstable supports ?) will be investigated. IN5 is presently working with 400 detectors. The iistallation of a second series of 400 more is foreseen. Detector supports and shielding have been delivered and improved cabling has been developed. Problems arose with the insulating ceramics ; delivery of all detectors has been delayed until 1977.

Filling the 3He cryostat on IN5

To improve background scattering a He filled sample box has been built. It can accommodate different cryostats and furnaces as well as several samples which can be brought by means of a new sample lift. The instrument was in full operation throughout the year with a total of 44 experi­ments of an average duration of S days. The NICOLE data acquisition system has been working very efficiently. The only major drawback concerning continuous operation is power failures

during the summer period. It is hoped that in 1977 a safe power supply will be­come available. The need for a flexible choice of \ and resolution may be illustrated by the fol­lowing table.

chopper speed use 1976 grange % use 1976

6000 RPM 10% 3 - 6A 38%

10000 34% 6 - 1 0 A 57%

12500 6% 1 0 - 1 1 A 5%

15000 50%

Further development is intended to push towards higher resolution (20000 RPM) and easier variation of the chopper speed. It is hoped that the planned new TOF spectrometer "IN5 bis" will relieve INS in the \ < 6 A region while IN5 will be used even more at long wavelengths.

;1V;

« f:*i V j W ^M ^ «

B«nks of detectors on INS

34

IN7 - DOUBLE MONOCHROMATOR + FERMI SPECTROMETER (A.P. Murani) The modified IN7 spectrometer (consisting of a graphite double monochromator and a single box of He 3 counters ; area : 15 x 30 cm. flight path : 2.35 ml has been used for a few scheduled experiments but mainly for tests and experiments by scientists in Grenoble (CNRS and ILL) and visitors coming to ILL for experi­ments on other instruments. Because of the limited detector area the experiments take rather long periods and consequently the demand for the instrument has been limited • in particular proposers of experiments transferred from IN4 have asked to be delayed until the new counter bank is installed. The latter will increase the detector area by a factor of 6, the maximum possible within the tight limits of the available space. It is hoped to complete the instal lation by the spring of next year.

IN9-POLARIZED PROTON FILTER (G.T. Jenkin, D. Feltin, J.L. Ragazzoni) Work has continued on the optimization of the spin filter for the proposed inelastic instrument IN9. The apparatus became operational again in May, after it had been moved to a position to ure the waste beam from INTO. Neutrons were only available when the transparent doppler machine was used. A Heusler crystal in a compact samarium magnet was obtained as polarizer/monochromator, and a beryllium filter bought to eliminate \/2 for (X :3 — 5 A}. The shielding of the polarizer required considerable attention. A new cavity has been made for the filter to minimize the presence of He 3 in the neutron beam, while at the same time retaining the high polarization in the hy­drogen of the filter. This design has been found to work very well (see ILL publi­cation 76J237T). The 90% polarization enables an estimated transmission of neutrons of 45% and 3% for the spins parallel and antiparallel. with allowance for imperfect polarization from Heusler. The electronics have been radically improved during the year, with the loan of a Rutherford Laboratory N.M.R. system allowing accurate monitoring of nuclear polarization and stabilization of magnetic field. The microwave frequency is now phase locked to a crystal controlled frequency synthesiser enabling a high pola­rization in the filter stable to 1% to be held for 2 weeks. Mains failure is the limi­ting factor. An experiment with the old DIB multidetector has not allowed any observation of a small angle scattering pattern.elimi/iating one area of doubt about this type of filter. The detailed design of the inelastic instrument is now being undertaken.

IN11 -SPIN ECHO SPECTROMETER (J. Hayter and F. Mezei) For most of the year IN11 continued to run in its mirror-testing mode, evaluating supermirrors and a prototype polarising beam-bender (see section on "Develop­ment of new techniques"). The design of IN11 was based on the assumption that a long-wavelength pola­risation analyser would be built which was nearly 2 orders of magnitude smaller and lighter than any existing at the time (early 1974). The excellent performance of the polarising bander now makes this a reality. In the first instance, the machine will use a SO x 30 mm 2 cross-section bender as polariser, and a 50 x 40 mm 2

bender as analyser, both being 200 mm long. Sines October, the machine has been converted back to its original configuration for spin-echo operation. The final 5 m section of guide has been mounted between the velocity selector and the polariser position, tests have been concluded on the magnet control electronics, and the sample-access walkway has been installed.

Coordinator : R.Scherm

instrument group ^diffuse scattering77

This group includes the following instruments :

On the cold guide H15 D7 Diffuse scattering spectrometer D11A : Small angle scattering spectrometer D11B : Small angle and diffuse scattering spectrometer IN10 Backscattering spectrometer.

On the cold guide H16 D16 Four circle Mk6 diffractometer

On the cold guide H17 D17 New small angle and diffuse scattering spectrometer.

1. - APPARATUS IN F'ILL OPERATION D7 - DIFFUSE SCATTERING SPECTROMETER (W. Just, •». Radhakrishna) The instniment was running with unpolarized neutrons for the first three reactor cycles V this year. In June polarized neutrons were installed again, using the Heuslei alloy Cu2AIMn as pohrizer at about 5 A. A dynamical spin flip mode was put into service and is available now as an option to conventional spin flip methods. In this mode the incoming neutron spins are flipped up and down in pseudo-statistical sequence ; the scattered neutrons are registered in 127 time channels per detector. The raw spectra can be cross-correlated on-line (NICOLE) and the result displayed at any time during a measurement. This option repre­sents a powerful means in diffuse magnetic scatvering of discriminating inelastic spin-independent scattering processes.

D11A - SMALL ANGLE SCATTERING SPECTROMETER (K. lbel,J. Haas) The reliability of the DHA-system, of utmost importance with regard to the large number of users and the tight experimental programme,could be further increased. The transfer of the detector is now more easily possible by means of a stable movable crane, the sample area being serviced now by a jib crane. The manual of the instrument is now available in its fifth revised edition. A description has been published in J. Appl. Crystallography Vol. 9, Part 4, August 1976, page296.

IN10 - BACKSCATTERING SPECTROMETER (A. Heidemann, S. Howells) A step motor control system was installed which allows the driving of the step motors o' the sample and the graphite goniometers via the PDP11 computer. A new small analyser consisting of seven concentric analyser ciccles was put into operation. Seven Q values between 0.07 A' 1 and 0.32 A-' can t measured simul­taneously. The system was used for the study of polymers, membranes, liquid crystals and hydrogen in metals. A third Doppler drive which is transparent and "fast" (v < 3 m/s) is under construction. The state of the spectrometer can now be controlled by telephone. Apart from a severe breakdown in June/July where 70% of one reactor cycle was lost due to a memory fault, the'machine was ope­rating satisfactorily.

D16 - FOUR CIRCLE Mk6 DIFFRACTOMETER (G. Zaccai, S. Wilson) This year, D16 has been used for studies on partially oriented samples such as biological membranes and clays in strictly controlled temperature and relative humidity environments, as well as for studies on single crystals where a long wavelength was required, 'or example to examine the dependence of extinction on wavelength. An effective increase of a factor of ten in intensity has been achieved, where large samples have been available, by the installation a 1 5 cm diameter counter and high transmission mylar collimators with an angular divergence of 0.2° in 20 , corresponding to a few hundred Angstroms resolution in real space. The cross-sectional area of sample which can now be illuminated by the neutron beam i s 3 x 5 c m 2 . The flexibility of data collection program on the PDP8 (shared by D15) has been improved by the acquisition of extra core memory. The curved multidetector under construction (D19), will be compatible for use on D16.

2. - APPARATUS UNDER CONSTRUCTION D11B - SMALL ANGLE AND DIFFUSE SCATTERING SPECTROMETER (G. Kostorz, G. Goeltz) After installation of the new vacuum components, D11B has been mechanically operational since November 1975, serving as vacuum vessel for D11A experiments. Detectors and electronics have been linked to the PDP11/40 computer, and the data acquisition path has been tested successfully. Software development has continued for D11B (detector array) and D11A (multidetector), and several programs for data acquisition and on-line data reduction are available. Others are progressing, with emphasis on user-oriented display programs. The link between PDP11 and the central PDP10 computer has been established and tested. A cryo­stat for diffuse scattering experiments and a five/eight position, computer con-

trolled sample changer including a rotational drive have been developed at the Rutherford Laboratory in collaboration with I.L.L These items have been tested for short periods, and the corresponding software is available. More extensive tests are necessary and will take place in 1977. The still unsatisfactory shielding situation on the IN12 side of the instrument will be improved subsequently.

D17 -SMALL.ANGLE AND DIFFUSE SCATTERING SPECTROMETER (M. Roth, P. Timmins). The installation of the new small angle and diffuse scattering machine D17 was completed during this year. The main parts of the spectrometer are a "elocity selector, a chopper for TOF analysis, a special collimator system, a step motor controlled sample table (sample changer), a multidetector (64 x 64 cm 2 , 128 x 128 elements) and a PDP11/40 computer. First tests of the instrument showed that the performance is as expected. The intensity at 11 — 12 A is very similar to that of 011. It is interesting to note the relatively high flux of long (12 — 25 A) wavelength neutrons. Further tests and studies are necessary until March or April 1977. Then the spectrometer will be available for external users. Studies of the use of polarized neutrons on the machine are in progress.

Coordinator : A. HEIDEMANN

39

instrument group ^diffraction instruments^ This group was formed in November 1976 by an amalgamation of the groups powder diffraction (co-ordinator P. Convert), crystallography (A. Hewat) and polarized neutrons (F. Tasset/J. Brown). The special diffractometer 010 was also Included, while the cold neutron diffractometer D16 left for the neutron diffusion group. The group now includes the following instruments.

D1A D1B D2 D3

D4 DS D6/D19 D8 D9 D10A/B DI2 D15 D1B LI4/5/7

High resolution powder diffractometer on thermal guide H22. Multidetector on thermal guide H22. High flux 2-axis diffractometer on thermal beam H11. Two-axis polarized neutron diffractometer with lifting counter on thermal beam H5. Liquids diffractometer on hot beam H8. Three-axis polarization analysis spectrometer on hot beam H4. Modified Laue/2D multidetector tests on thermal guide H24. High flux four circle diffractometer on thermal beam H11. Four circle diffractometer on hot beam H3. Four circle three-axis diffractometer on thermal guide H24. Neutron camera, on thermal guide H23. Four circle Mk6 diffractometer on inclined thermal beam IH4. Neutron interferometer on neutron guide H25. X-ray laboratories.

Most of these machines have passed the initial stages of construction, testing and modification and are fully scheduled for experiments. Emphasis on technical improvements is now centred on two main areas : firstly to widen the range of sample environment, and secondly to increase the speed and ease of data col­lection.

Neutron diffraction still has an enormous potential for development in these two areas. Because neutrons are more penetrating than X-rays, more sophisticated refrigerators, cryostats, furnaces and pressure cells are possible : most of the diffractometers have seen major improvements in this area in 1976, and more are planned for 1977. These improvements, although perhaps "conventional" by normal ILL standards, open up quite new possibilities for crystal structure research : it becomes possible to "force" a structure rather than simply accept it as it is. We can then hope to understand "why" as well as "what" it is.

Increase in the speed and ease of data collection is perhaps only a question of

economics : but then so Is the construction of a high flux reactor. Many of the diffractometers have recently seen a dramatic increase in effective intensity, as much as an order of magnitude. And this for a relatively small investment in new monochromators, especially focusing monochromators, in mechanics and collimators, and in new detectors, especially multidetectors and data acqui­sition systems.

D1A - HIGH RESOLUTION POWDER DIFFRACTOMETER (A.W. Hewat) D1A has operated routinely with its new high efficiency collimator bank (Nticl. Instr. Methods 137, 463). Wavelengths between 1.2 A and 5.7 A can now be selected by simple rotation of a single squashed germanium 'monochromator. A prototype focusing monochromator has been shown to concentrate the beam from 150 mm to 15 mm with a corresponding order of magnitude intensity gain, and a definitive version will be installed early in 1977. This monochromator, using the new ILL technique for producing anisotropic mosaic spread in squash­ed Ge, will give a choice between 1.1 A, 1.38 A and 1.9 A, and will be especially useful for the high pressure techniques being developed with the CNRS Grenoble Laboratory.

DI B - TWO-AXIS DIFFRACTOMETER WITH MULTIDETECTOR (P. Convert/J.L. Buevoz from 1.9.76 with P. Thorel until 31.8.761 The instrument has worked satisfactorily all the year. For kinetic experiments, the dead time between two measurements has been reduced (about 1 second with Carine 3). However the Carine system is not adapted and reduce» the possibilities of D1B : it is impossible to compare two diagrams on the instrument. It is now obvious that it is practically impossible to control an experiment without a new system allowing for immediate data comparison, and eventually primary data evaluation. More and more short experiments are performed for characterisation of samples to be used on other ILL instruments. In 1977, increase of the flux and facilities to change the wavelength are planned.

D2-TWO-AXIS HIGH FLUX DIFFRACTOMETER FOR POWDERS AND SINGLE CRYSTALS iK.R.A. Ziebeck) Throughout 1976 D2 continued to operate efficiently. Improvements to the detector shielding and that of the environment of D2 have minimised the back­ground. The introduction of four mylar sollers before the detectors has increased the detected flux and ensured that the line shapes of the four detectors are uniform end consistent. These small innovations when coupled with an increased "take off" angle on the monochromator have improved both the flux and the resolution. The instrument remains a versatile variable wavelength 2-E is spectrometer.

DIB : set-up for a kinetic experiment

D3-TWO-AXIS POLARIZED NEUTRON DIFFRACTOMETER (J. Brown and F. Tasset) D3 has been in high demand during 1976. It has been used for the determination of magnetic scattering amplitudes from a wide range of materials, mostly ferro­magnetic, antiferomagnette and paramagnetic phases. The commissioning of the 4.8 T asymmetrically wound cryomagnet early in the year has increased its range of application considerably. Experiments can now be done in fields of up to 4.8 T at temperatures between 1.5 K and 400 K.

A suits of programs is now available on the DEC-10 computer which allows rapid evaluation cf the data, and this can lead directly from the D3 dectapes to a magne­tisation ri'jfisity map (see figure 7).

D4 - I "AT-AXIS "LIQUIDS DIFFRACTOMETER" ON THE HOT SOURCE <P.CIi:eL ,dW. Knoll) U'4 iids oe ; fully operational and almost trouble free during 1976. New single crystal s?.:. tfiire sample holders for use at high temperatures represent a major improvement. As well, improved protection has reduced the instrument back­ground to one half its former vatue. Priority in 1977 has been given to impro­ving the effective intensity and we expect to have soon a multidetecior working routinely on this drff ractometer at a wavelength near 0.5 À.

42

Fig. 7 Projection of the pa* rtmagnetic magneti­zation In URh3 on thelllOlpllne.

D5 - THREE-AXIS POLAR IZATION ANALYSIS SPECTROMETER (J. Schweizer) D5 has been used either for magnetic form factor measurements (mostly on single crystals, but also on powders and amorphous materials) or in the polarization analysis setting to separate cross-sections (magnetism, coherent/incoherent scat­tering from liquids). Many experiments have used the cryomagnet which provides a vertical 4.8 T magnetic field. Advantage has been taken of the hot source in experiments where, besides extinction problems, wavelengths smaller than 0.50 A allowed the study of elements which are very absorbing at high-.r X, (e.g. sama­rium). This type of experiment will probably continue (with gadolinium, etc.) since with such short wavelengths no special isotope is needed.

A horizontal electromagnet with a large gap is expected to be available towards the end of 1976. On the one hand, it will allow measurements at large K (access

angle ± 50°) with a 10 KOe horizontal field : on the other hand, using an extra Helmholtz coil in the polarization analysis setting, it will allow a direct compa­rison of cross-sections with the field vertical or horizontal (H//k and H1 k) without modifying the sample environment.

D6/D19 - MODI Fl ED LAUE/2D-MULTIDETECTOR TESTS (S. Wilson) The "hedgehog" diffractometer has undergone a series of tests and has been shown to very largely meet the design specifications of its constructor, B. Klar. A full report has been prepared. It has also been confirmed that to make it a routinely operating instrument would require a considerable expenditure to replace the 100 movable detectors, which are not sufficiently homogeneous and whose positioning motors are too slow. Instead we propose to make a techno­logical jump directly to a two dimensional position sensitive detector <U19) which, after development on D6, will be used as a self-contained system on diffracto-meters such as D8, D9 and D16.

D8 - HIGH FLUX FOUR CIRCLE DIFFRACTOMETER (S. Mason/C. Riekel from 1977) The flux at the sample has been further increased to 8 x 10 7 n/cm2/sec with a new ILL Cu(200) monochromator. For special applications, such as protein crystal­lography. 2 x 10 s n/cm2/sec can be obtained from pyrolytic graphite, but only at the expense of resolution. To match this higher flux, a new control system, based on the POP 11/40 calculator originally used by D14, will be implemented in 1977. A new Fortran program system (ILL report 76B270T) common to D8, D9 and D10 has already simplified and speeded up data collection.

The Displex closed cycle refrigerator, identical with that on D9, now operates routinely at temperatures above 45 K, with the sample usually protected by vanadium or aluminium cans. This, together with the high flux, greatly extends the range of problems possible, so that now a structure can be studied at different temperatures in an acceptable time.

D9 - FOUR CIRCLE DIFFRACTOMETER WITH SHORT WAVELENGTHS (M. Lehmann) D9 on the hot neutron source has relatively good flux (3 x 10 6 n/cm2/sec) at wavelengths much shorter than usual (0.5 to 0.S A). This wavelength can be varied continuously because the a2 collimator moves on air cushions between the water-filled lips of a novel monochromator protection. D9 is unique for work with high spatial resolution on moderately large structures and the short wave­length also makes it interesting where extinction might otherwise be a problem. New monochromators, especially beryllium being developed at the ILL, should increase the flux, and operation will also be speeded by mechanical improvements to the counter support.

44

D9 was the first diffractometer to be equipped with a closed cycle refrigerator operating down to 45 K, and this has proved very popular. In 1977, we hope to have developed a gas flow furnace operating at up to 800°C, again with full three dimensional geometry.

I "3*11

?-c. "/it )P]'H

•?-<*, :f%,h> f

/).:

iKLÂii.,\i^l-\,ÂuLd^&r, •:.uii'_ „22iWU-

Eulerian ample-orienting cradle on diffractometer 09.

D10A/B - FOUR CIRCLE THREE-AXIS DIFFRACTOMETER (C. Zeyen) Since May 1976 a new vertically focusing composite copper monochromator has been in operation. The flux at the sample position was thus increased from 10 6 to2 .10 7 n/cm2/sec.

This allowed for the observation of a number of small effects in the field of dif­fuse, critical, and Huang scattering. The data acquisition rate increased drama­tically so that now the spectrometer is severely handicapped by the slow time­sharing Carine computer system.

This year the flexibility of the 4-circle Helium-cryostat with the analyzer was shown to be particularly useful in a variety of problems such as 6 low temperature structure determinations, 3 diffuse scattering problems, and 2 critical scattering studies.

From June 1977 a new more accurate Eulerlan cradle with a new type of Helium flow cryostat for temperatures as low as 2.6 K will be available. A new epithermal counter shielding is expected to further reduce the background.

D12 - NEUTRON CAMERAS (D. Hohlwein A. Wright from 19771. Neutron film techniques are of exciting interest for a variety of applications stretching from protein crystallography to magnetic structures, structural tran­sitions and critical scattering. In these fields the neutron Weissenberg and Precession cameras can often provide an astonishing contrast as well as a supple­ment to the information available from their X-ray counterparts. The modified Laue camera uses a bent Cu monochromator to select a 7% band of wavelengths so that many reflexions can be excited simultaneously : this compensates to some extent for the lower flux of neutron sources. In 1976 a cryostat attachment was implemented, extending the operating tem­perature of the cameras down to 1.5 K. In 1977 a refrigerator will allow faster operation at temperatures above 10 K, which will be especially interesting for work on phase transitions.

D15 - FOUR CIRCLE DIFFRACTOMETER ON AN INCLINED BEAM (M. Thomas) This instrument became available for scheduling early in 1976, and since then has worked reliably. In the lifting counter mode, the X-circle can be replaced by large cryostats and magnets working down to 1.5 K as on its sister machine D3 ; it is then useful for work on magnetic structures and critical scattering. In 1977, the lifting counter will be computer controlled and extra core is being implemented on the POPS calculator (shared with D16) to permit more sophis­ticated programming. In the four circle mode of operation, programs have been written for avoiding blind spots due to the large X -circle. In 1977 this X -circle will carry a two-stage refrigerator, which will permit temperatures down to 10 K with full three dimensional geometry.

D18A - NEUTRON INTERFEROMETER (W. Bauspiess) This instrument is under construction at the thermal guide H25 following success­ful operation of a prototype machine (S12) in the same position. The instrument is designed to perform Bragg-diffraction interferometry as well as high resolution double crystal diffraction work. A built-in X-ray tube will serve as wavelength standard and a stable source of high intensity for crystal alignment. The instrument will be operational (in a semi-automatic mode) m 1977. On the prototype setup (S12) the measurement of scattering lengths of solid samples has been further developed, to a degree where the resolution (Ab c/b c

~ 10~3) is mainly determined by sample parameters. A standard data evaluation program is available.

Polarization effects have been investigated in the case of simultaneous phase shift and spin rotation of the neutron wave. As predicted, the polarization oscil­lates when the phase of the neutron wave is shifted continuously (e.g. by rotating any non-magnetic sample), even if the magnetic field applied to one partial beam is not changed. Test experiments on gases and magnetic samples have been started.

LI4/5/7 - X-RAY LABORATORIES (M. Thomas, J. Reynal and J. Brown) These machines are used for preliminary crystal alignment and for crystal structure measurements complementing the work on the neutron diffractometers. LI 4 is a four circle automatic (PDP 8) Siemens X-ray diffractometer with a nitrogen cryostat In 1976 the paper tape data collection system was replaced by a simple "silent" magnetic tape terminal, which permits direct transfer to the central DEC-10 computer. LI 5, which is used for photographic measurements and crystal alignment, is being modified to make it safer for the large variety of potential users at the ILL : the original generator has been replaced by a new Philips gene­rator with automatic safety shutters.

Coordinator : A.W. Hewat

47

. , f f ^ t . . . . . ^ ^ ^ t o M H . J

instruments for nuclear physics This group includes four large spectrometers (PN1-PN4) with internal targets at very high neutron flux. They have excellent resolution. The facility for ultra cold neutrons (PNS) and most of the special experiments have recently been allocated to this group.

PN1 Mass Separator for Unslowed Fission Products (LOHENGRIN) on beam tube H9

PN2 Beta Spectrometer (BILL) on the vertical beam tube V3 PN3 Three Curved Crystal Spectrometers (GAMS 1, 2,3) on the through

going beam tube H6/H7 PN4 Ge Anti-Compton and Pair Spectrometers on the through going

beam tube H6/H7 PNB : Ultra-Cold Neutron Source on the inclined beam tube IH3 S1 Gamma AsymnietrySpectrometeronneutronguideH142L S4 Magnetic Moment of the Neutron on neutron guide H18L S10 Neutron Induced Particle Emission on neutron guide H22W S14 Time Reversal Invariance on neutron guide H142L S16 Ternary Fission on inclined beam tube I HI S28 On-Line Mass Separator for Thermally Ionized Fission Products

(OSTIS) on neutron guide H23L S30 Concentration Profiles by Neutron-Induced Particle Emission on

neutron guide H2SM. In addition 6 short-term experiments have been set up on neutron guides.

PN1 - MASS SEPARATOR LOHENGRIN FOR UNSLOWED FISSION PRODUCTS (H. Schrader) The very high demand for this instrument continued in 1976. During 70% of the scheduled reactor operating time 23 visitor experiments were carried out ; 7% of the time had to be used for instrument tests and 23% of the scheduled operating time was lost due to instrument failures or reactor shut-downs. Some 5-year-old instrument components, the Nicole on-line computer and the shortage of techni­cians for maintenance caused some problems. After a continuous running time of 2.5 years the Uranium sputtered from the targets onto the surrounding materials now causes a fission product background of 3%. Therefore special developments are now being tested to reduce this background. The tests will be continued in 1977. A new exit slit was constructed which offers more flexibility for experi­ments and corresponds better to the experimentally determined focal line. Measurements were performed to determine fission yields by scanning, by regis­tration of 7-lines with known absolute intensity and by the collision X-ray method.

^ 48

wjiiMAai TJw i "i in »^*M<a^.

In addition, a new technique for deducing yields by comparing r-spectra from OSTIS and LOHENGRIN was tested. At OSTIS a 0<decay chain has one definite starting point whereas at LOHENGRIN there are many starting points due to the nuclear charge distribution in fission. In nuclear spectroscopy on neutron rich fission products, major results have been obtained on 7-decay schemes, fiend point energies and delayed neutron emission probabilities of 15 nuclei.

PN2 - BETA SPECTROMETER BILL (K. Schreckenbach) During 1976 the bete spectrometer BILL was running continuously for 90% of the time without any major break-down. 17 nuclei have been investigated to provide information on the nuclear structure of these isotopes and on the atomic structure. For instance, the unparalleled resolution allowed the determination of neutron binding energies with a precision of 10 5 (BO eV error on 8 MeV). The precision of the spectrometer was further increased by temperature stabili­sation of the magnets, resulting in a better linearity above 2 MeV. The detectors are now mounted in such a way that they can be adjusted for optimum reso­lution without breaking the vacuum. A new air-tight target changing facility was constructed, which made it possible to use a-active or toxic targets or materials that would otherwise be oxidised in contact with air. This improvement extends considerably the range of interesting targets to be studied with BILL.

PN3 - CURVED CRYSTAL SPECTROMETERS GAMS 1 AND GAMS 2/3 (H. Borner, W.F. Davidson) %

In 1976 the GAMS 1 spectrometer was operational 85% of the time. For the GAMS 2/3 spectrometers this figure is 15% lower due to a computer break-down. Spectra of 7-rays following neutron capture in 12 different targets were studied. On the technical front several improvements were made to the spectrometers and their associated data collection systems. The reliability of the data collection was greatly improved by assigning a separate PDP11/40 computer for control of the GAMS 2/3 spectrometers. At GAMS 1 automation systems for remote-controlled tilting of the main quartz crystal about the beam axis and for adjustirg the control crystal onto the reference y-beam have been developed and have reached the commissioning stage. At GAMS 2/3, in order to augment the trans­mission of lower energy y-rays, an 8 m long evacuated tube has been installed.

A concomitant improvement in source techniques has led to the achievement of better line resolutions. For instance a line width of better than 0.7 sec of arc can be attained on the 24 m spectrometer. In fifth order of diffraction this cor­responds to about 45 eV FWHM on the well known 411 keV 7-line in 1 9 8 H g . An interesting development is the growing interest in the study of transuranium and other actinide nucleides. Consequently modifications to the H6/H7 through-tube for the introduction of a-emitting targets were carried out first of all in prototype fashion for a 2 * 8 C m target. More permanent modifications to enable the safe introduction of further a-emitters are currently in progress.

M 49

*ïft

View of the GAMS 2/3 curved-crystal spectrometers. The white cylindrical housing in the fore­ground contains the quartz crystals. The two arms in the background are the Soller collimators down which the diffracted rays pass.

T - ' y * " • • • •

J

V f t -

'W^Syaa&i^^ia

Interior view of the

cylindrical housing

showing the two cur-

ved quartz crystals

and their clamping

blocks. They share

a common vertical

axis of rotation.

50

PN4 - Ge ANTI-COMPTON AND PAIR SPECTROMETERS (D. Warner) The Ge pair-spectrometer was fully operational throughout 1976. However, the 10-year-old electronic system caused some problems, resulting In failure 15% of the time. Useful data have obtained with a resolution of S keV at 7.7 MeV. The data analysis software has been extended and improved considerably. The operation of the Ge anti-Compton spectrometer was delayed by difficulties in manufacturing a suitable Ge-crystal. Now these problems have been solved with the advantage that the crystal supplied has a 50% higher efficiency and is of Intrinsic rather than Li drifted Ge. The spectrometer should become operational by the end of 1976 with improved specification.

PN5 - ULTRA-COLD NEUTRON SOURCE (P. Ageron) Construction and installation of the ultra-cold neutron source has progressed during 1976. The out-of-pile guides have been tested and tha in-pile part is ready for mounting. The inclined beam tube IH3 made it necessary to build a platform of about 100 m 2 which is 5 m above the ground floor. This platform provides space for the shielding which is currently under installation, and for three measuring positions. The installation of the ultra-cold neutron source should be completed in March 1977. The expected neutron flux b about n/cm2/sec sec for neutron velocities below 6 m/sec and 10000 n/cm2/sec in the velocity range between 10 and 20 m/sec.

Ultra-cold neutron source during construction

51

SI - GAMMA ASYMMETRY SPECTROMETER (B. Vignon) The experimental set-up already described in the 1975 ILL annual report was fully operational and used without any significant modification.

S4 - MAGNETIC MOMENT OF THE NEUTRON (W. Mampe) The set-up to measure the electric dipole moment of the neutron has been trans­formed to allow a precision measurement of the magnetic dipole moment of the neutrons. A beam of slow neutrons (» 100 m/sec) undergoes the same magnetic resonance as a beam of protons from a stream of flowing water. In this way the exactly known magnetic moment of the proton is directly compared to that of the neutron, increasing the precision of the latter by two orders of magnitude.

S14 -T IME REVERSAL INVARIANCE

(B. Vignon - Collaboration ISN Grenoble and Sussex University) To look for a possible violation of T invariance in electromagnetic processes, a detector arrangement of six Nal crystals (3" x 3") was installed which can register 8 relevant angular correlations simultaneously. With a fast electronic system count rates of 2 x 1Qs/sec (above a threshold of 200fteV) could be handled at a desired energy resolution of 10%. The performance of the set-up described and the electronic stabilisation permitted a statistical accuracy of 3 x 10"5 to be obtained in two months.

S28— ON-LINE MASS SEPARATOR OSTIS FOR THERMALLY IONIZED FISSION PRODUCTS (K.D. Wûnsch)

In October and November 1975 OSTIS was installed successfully on neutron guide H23. Since the beginning of 1976 this mass separator worked in a very reliable way, fully benefiting from the high neutron flux. As a consequence there was a very high demand for this instrument. The separator beam was available 73% of the scheduled reactor operating time for 14 different proposals ; 7% of the time was used for instrument tests and modification. The remaining 20% were lost due to instrument failures or reactor shut-downs.

The separator, ' '; by the University of Giessen, is equipped with a variety of detectors in a heavily shielded area. Devices for ion and ^-counting are available. A Ge(Li) and an intrinsic Ge detector are connected to the instrument. This basic set-up allows yield and half-life determination, -y-ray spectroscopy, 0-end point determination with very high precision, and an indirect measurement of delayed neulron emission to ground and excited states. A second Ge detector and four different neutron detectors have been provided by visitors to measure

11 coincidences, delayed neutron emission probabilities or the kinetic energy spectra of the delayed neutrons with three different methods. Important results have been obtained for nuclei far from stability. During the annual shut-down, the first elnzelltns was replaced by a quadrupole doublet increasing the intensity of OSTIS by at least half an order of magnitude. Now extremely neutron-rich isotopes like 9 8 R b and 1 4 7 C s are also available for investigation in 1977.

The experimental set-ups of S10, SI 6 and S30, consisting mainly of the appro­priate detectors in their reaction chambers with the necessary shielding and pum­ping, are not complex technical installations, and are therefore not described here in detail. For scientific results of these and of all other instruments mentioned above, see the section of College 111 in this volume and in the Annex to the Annual Report.

Co-ordinator : G. Siegert

instrument group N\nonochromators//

The group includes the following devices :

013A : Neutron double-crystal diffractometer on thermal guide H24 D13B : High precision neutron double-crystal diffractometer on H24 IJ13C : Neutron single crystal orientation unit on H23 LI2 : X-ray double crystal diffractometer LI3 : Gamma-ray diffractometer

Laboratory for crystal orientation and preparation.

1 - INSTRUMENT DEVELOPMENT

The mechanical tests of the high resolution diffractometer 013B being completed this instrument is now ready for installation on H24. The double-crystal orien­tation unit D13C is also prepared for installation on H23 in January 1977. As the other instruments of the group are working satisfactorily no major modifications have been performed in 1976. As also in earlier years many routine tests of the perfection of single crystals prepared for neutron monochromatization as well as for experiments scheduled on other ILL instruments were carried out in 1976.

2 - DEVELOPMENT OF MONOCHROMATOR MATERIALS

Whereas in the year 1975 monochromator crystals for thermal neutrons have been developed successfully (Cu, NbD), in this year we succeeded to improve consi­derably monochromator crystals for long wavelength neutrons (Ge, Si). The in-beam control of the mosaic spread of these crystals on the T-diffractometer during their plastic deformation at high temperature made it possible to find out more rapidly the optimum deformation parameters i.e. temperature, pressure, orien­tation and dimension of the crystals and increased the reproducibility of the reflec­ting properties. It has now become possible to produce Ge and Si monochro-mators with a mosaic spread ranging from some minutes of arc to several degrees distributed in a homogeneous way. In addition the mosaic spread is highly ani­sotropic because of the special dislocation arrangement. Thus it is possible to vary the mosaic spread during an experiment by simply turning it about an axis normal to the reflecting planes. Fig. 7 shows the variation of the neutron (111) rocking curve width 0, the mosaic spread i) and the neutron peak reflectivity r as a function of this rotation (angle $ ) . Fig. 8 represents the rocking curves with minimum and maximum width using the same crystal of 3 x 3 x 1 cm 3 (re­flection geometry). The anisotropic mosaic spread also has a special advantage for vertical focusing where the vertical mosaic spread can be made several times smaller than the horizontal one.

Variation of the neutron (111) ' " ' ' • 8

rocking curve width ft the mosaic Rocking curves with minimum spread T) and the neutron beam and maximum width using the reflectivity r as a function of the same crystal of 3 x 3 x 1 cm3 rotating angle <|> (reflection geometry).

A new series of ten CuJGe) crystals has been grown and tested, the best were used to improve the performance of the monochromatizing neutron lens for IN3 . In collaboration wi th the Max-Planck-lnstitut in Stuttgart, Germany, the develop­ment of good-quality Beryllium single crystals has been started and first results are promising. These crystals will be of special use for high-energy neutron mono-chromators where improvements are still to be made.

3 - COMPOSITE SYSTEMS A N D BENT C R Y S T A L S

Several vertically focusing composite monochromators have been produced such as 2 0 Cu lamellae glued in a well-oriented way in a frame for vertical focusing on D 1 0 where the overall gain in f lux at about the same resolution was about a factor 2 0 due to the improved reflectivity, the well-adjusted mosaic spread and the focusing effect. The vertically focusing system on I N 3 yielded a factor 2.5 in f lux. I N 8 has been equipped with a device allowing the variation of the radius of vertical focusing. In order to increase still further the spatial homo­geneity of the mosaic structure large monochromator crystals are now routinely composed of several smaller pieces.

4 - D I F F R A C T I O N S T U D I E S OF IMPERFECT C R Y S T A L S

Neutron section topographs have proved t o give valuable information on the large-scale defect structure of deformed and undeformed samples. This technique

permits a mapping of crystal inhomogeneities and is a complementary tool for studying defect structure in single crystals observed on an angular scale by rocking curve measurements. The help of Drs. Schlenker and Baruchel is gratefully acknow­ledged. Other investigations on the more microscopic defect structure of imperfect crystals have been started using electron microscopy and X-ray topography. This work is performed in collaboration with the University of Oxford and is especially concerned with the relation between the neutron diffraction properties and the defect structure of imperfect crystals. The investigation of the diffraction charac­teristics of curved Si crystals have been continued. In particular several reflec­tivity measurements have been performed and interpreted by a simple model previously developed. The neutron space condensation due to an asymmetrical cut (Fankuchen effect) was observed on curved crystals and a design of a focusing monochromator for D8 has been worked out.

Co-ordinator : A. Freund

development of new techniques 1 . - ULTRA COLD NEUTRONS (G. Germain, P. Ageron)

- The progress of the construction of the UCN source (PN5) is described with the instruments for Nuclear Physics.

— The experimental set-up for VCN (very cold neutrons) selection has been used for : - the measurement of the gain of a liquid parahydrogen convenor : about

30 for neutrons 10 m/s < V < 50 m/s compared to room temperature mo­derators.

- the measurements of the transmission of VCN (velocity around 20 m/s) by different neutron guides : about 50% for a straight 6 m long, 6.7 cm diameter electropolished stainless steel guide, about 65% for a curved 6.8 m long, 7 x 7 cm section nickeled glass guide.

2. - STUDY OF COLD NEUTRON SOURCES (A. Robert, P. Agéron)

Preliminary calculations with the 2 dimensions transport code DOT 3, using the method (M. Livolant and al. Cryogenics, February 1969) of two overlapping thermal groups (cold and room temperatures) indicate that a cavity, inside the present H FR cold neutron source, would enhance by a factor of 2 the cold neutron flux in the guide tube direction. More detailed spectrum calculations are in pro­gress.

3. - POLARISATION OF NEUTRONS

3.1 — Supermirror Polarisers (F. Mezei and P. Dagleish) Multilayer thin-film optic techniques have been used to produce neutron mirrors with higher critical angles than are possible with conventional mirrors. Such "super-mirrors" are formed from bilayers successively evaporated with an appropriate thickness gradient. The use of alternating magnetic and non-magnetic materials to form the bilayers permits such a mirror to be polarising. The figure 10 shows results for two such supermirrors, both using Fe and Ag as the bilayer components. The polarising efficiency is better than 99%.

3.2 - Polarising Beam Bender (J.B. Hayter (I.L.L.) and J. Penfold, W.G. Williams (Rutherford Laboratory)). The joint Rutherford Laboratory - I.L.L. project to build a polarising beam bender (ultra-compact multi-channel polarising guide) culminated in summer 1976 with the successful production of a prototype bender of cross-section 5 x 30 mm 2

and 180 mm length.

ioo %

>-r-

t -u u _l u_ LxJ CL

05* î 8 1.0* \5' 8 Fig. 10 C Reflectivity versus incident engle for Fe-Ag supermirrors (8c is the critical angle for a simple Ni mirrori. The structure in the curves results from interference effects in the multilayer system.

Designed to operate above 6 A, the bender had a polarising efficiency > 95% for a spectrum centred on 7 A and with AX/A = i 20%. Transmission was 41% for the (-t- ) spin-state.

Construction of two benders (polariser and analyser) for IN11 is now almost complete. These will have cross-sections 30 x 50 mm 2 and 40 x 50 mm 2 , res­pectively. Both will be 180 mm long, with radius of curvature 6500 mm, giving a beam deflection of 1.5°.

58

colleges

introduction

All the internal scientific activity of the institut is grouped into "colleges" with particular scientific interests.

The following is the current list of colleges : College 2 : Theory College 3 Fundamental and Nuclear Physics College 4 : Excitations College 5 : Structures College 6 : Liquids, gases and amorphous materials College 7 Impurities College 8 : Structural biology College 9 : Chemistry

Each College corresponds to a Subcommittee of the Scientific Council of the I.L.L., which advises the directors on the scientific programme. New research proposals submitted to the I.L.L. will first be examined by the Colleges with respect to their technical feasibility and then be presented to the Council. A further task of the College is to contribute to a smooth carrying-out of the experiments by appointing local contacts and by advising the instrument responsible as well as the Scientific Secretary on the time schedules for the various instruments.

59

In 1976 experimenters came to I.LL. from these research centres or universities

college 2 «theory» I - MEMBERS OF THE COLLEGE

BurkhardtT.W. Derrida B. • Eisenriegler E. Fogedby H.C. Gautier F. Hinkelmann H.J. Iche G. Loveluck J.M. Lovesey S.W. Nozières P. Schuck P. Southern B.W. Trammel G. Word R. Young P.

(From Oct. 1976) (From Oct. 1976) (From Oct. 1976)

(From Oct. 1976)

(To April 1976)

(From May 1976)

(To July 1976) (To Aug. 1976)

I I -VISITING SCIENTISTS

Balcar E.

Beal-Monod M.T. Hubermann B.A.

KaganY. Lewis J.W.E. Licciardello D.

Ring P. Schofield P. Sherrington D.

(Atominstitut Vienna) (Orsay) (Xerox, Palo Alto) (Moscow) (Rutherford Lab.) (Birmingham Univ.) (Munich Univ.) (Harwell) (London Univ.)

(This list does not include short visits of a few days).

Ill-SCIENTIFIC ACTIVITES

The Theory College has experienced another year of flux in its membership, although, this year, primarily an influx, which has resulted in a situation which promises to be comparatively stable, at least for the next two years. However, some flexibility has been retained, in that two positions are occupied by one-year visitors on leave of absence : E. Eisenriegler, from Julich, whose recent work has been concerned with one-dimensional conductors, in particular, aspects re­lated to the electron-phonon interaction, and the possibility of incommensurate phase transitions ; and F. Gautier, from Strasbourg, who has worked extensi­vely in the theory of alloys, in particular, magnetic alloys. In view of the dif­ficulties experienced in attracting French and German theorists to spend longer periods at the ILL, it is intended to continue this practice of encouraging long-term visitors on leave of absence from their home institutions. During the year, the Senior member of the Theory Group, P. Nozières, took up a chair at the University of Grenoble. Happily, he continues to spend a large fraction of his time at the ILL and to take a strong interest in the well-being of the Theory Group.

Besides the long-term visitors, mentioned above, there are a further three new members of the Theory College : B. Derrida, who will work with Nozières ; T.W. Burkhardt, whose field of interest is phase transitions and critical pheno-

mena ; and P. Schuck, the first nuclear theorist to join the College, but who should be joined by a second in a few months time. Without being exhaustive, some of the major areas of interest of the Theory College can be summarized as follows : — Phase transitions and critical phenomena are being studied by real-space re-

normalization group methods. The problems under investigation include the spin-glass. problem (Southern and Young), other models which include the possibility of tricritical points and first-crder phase transitions (Burkhardt), and the effect of surfaces and finite thickness on critical phenomena (Burkhardt and Eisenriegler). Renormalization group methods have also been applied, in recent work by Lovesey, to study departures from hydrodynamic behaviour in low-dimensional fluids : further work related to the theory of fluids is being done by Derrida, who is considering a model, of the Lorentz-attractor type, which describes some aspects of turbulence.

— In the field of many-body theory, one-dimensional conductors are continuing to receive attention by Hinkelmann, who has studied the optical properties of such systems, while Fogedby has applied the field-theoretic techniques, which he developed to study the dynamics of the one-dimensional electron gas to the Wolff model of an almost magnetic impurity in a non-magnetic host. Nozières has also continued his work on magnetic impurities, to consider more realistic models, including the possibility of orbital degeneracy.

Work on many-body theory now includes the study of nuclear matter, by Schuck, who is also conversant with the application of such techniques in solid-state physics, providing our lone nuclear theorist with a desirable overlap with other members of the College.

— The study of the specifically many-body aspects of magnetic impurities is now supplemented by Gautier's much more wide-ranging interest in alloys, recent work including a study of thermodynamic properties of transition metal alloys, which is of relevance to neutron scattering experimentalists in this field, and to other experimental and theoretical work being done in Grenoble.

— The investigation of static and dynamic fluctuations in paramagnets and, in particular, the case of one-dimensional magnets, has continued (Loveluck and Lovesey) with a study of paramagnets in a magnetic field ; the theoretical study is being complemented by a computer simulation for Heisenberg magnets, and a projected experiment at the ILL adds further interest.

— A new interest is the study of superionic conductors (Hinkelmann and Hubermanni which has led to a collaboration in an experimental investigation (Hinkelmann and J.B. Suck).

— Nozières and collaborators have studied several topics which refuse the Pro­crustean bed of the above groupings : with Iche, the study of Brownian motion in the quantum regime was completed, culminating in the thesis of G. Iche ; various problems arising from previous work on chemical desorption were examined ; and a study of terrestrial magnetism has been commenced.

Hnally, the group has greatly benefited from the visits, both long and short term, listed above. G. Tremmel, spending his sabbatical year at the ILL, informed us, in several provocative seminars, of his rather fundamental work on subjects from gamma*ray lasers to the limits of microscopy ; 0. Sherrington interacted with the work on spin glesses, and the visit of D. Licciardello prompted an on-going study of the application of rescaling methods to the electron localization problem : contributions to computer simulation studies on spin dynamics in one-dimensional magnets, and on short-wavelength collective modes on liquids, were made by E. Balcar and J. Lewis, while B.A. Hubermann stimulated work on superionic conductors, and P. Schofield continued work with Lovesey on density fluctuations in small particles.

Secretary : J.M. Loveluck

college 3 «fundamental and nuclear physics» 1 - MEMBERS OF THE COLLEGE Schuck P.

Sellam R. (Grenoble) Almeida J. (I.S.N.1 Siegert G. Asghar M. Vignon B. (I.S.N.) Balestrini S. (Giessenand Warner D.

California) Wûnsch K.D. (Giessen) BerkoS. (Brandeis) Blachot J. Bocquet J.P.

(CENG) (CENG)

II-VISITING SCIENTISTS

Borner H. (Julien) Braumandl F. Alexeev V. (Leningrad) Caster R. (Brookhaven) Andersson G. (CERN) Cavafcjnac J.F. (I.S.N.) Armbruster P. (GSI Darmstadt) Charvet J.L. (I.S.N.) Clark D.D. (Cornell) Crançon J. (CENG) Clerc H.G. (Darmstadt) Davidson W.F. Decker R. (Giessen) Crawford G.I. (Glasgow)

Diggory A.F. Denschlag H.O. (Mainz) Do Huu Phuoc (Lyon) Forte M. (ISPRA) von Egidy T. Gelletly W. (Manchester) Emsallem A. (Lyon) Ha-.iltonW.D. (Sussex) Greene J. GuetC. Hawerkamp K. Hetzelt M.

(Harvard) Hoff R.W. (Livermore) Greene J. GuetC. Hawerkamp K. Hetzelt M.

Kienle P. Klein T.

(Munich) (Melbourne)

Hungerford P. Kratz K.L. (Mainz)

Jeenicke E. (I.S.N.) Leroux B. (Bordeaux) Jung G. Lôbner K.E.G. (Munich) Kaiser W. Miller P. (Oak Ridge) Koglin E. Larysz J.R. MampeW.

Nifenecker H. (Saclayl Koglin E. Larysz J.R. MampeW.

PendleburyJ. (Sussex)

Monnand E. (CENGI Prokofjev P. (Riga) Moussa A. (CENG) Ramsay N. (Harvard) Namenson A. (Washington) Sheline R,K. (Florida) Perrin P.E.J. (CENG) Signarbieux C. (Saclay) Pinston J.A. Sistemich K.. (Julich) Ribon P. Ristori C.

(Saclay) (CENG)

Smith K. (Sussex)

Robson J. (McGill) Smither R.K. (Argonne)

Roussille R. Van Assche P. (Mol)

Scharman P. (Sussex) Wilson R. (Harvard) SchraderH. Wollnik H. (Giessen) Schreckenbach K. Yoccoz J. (Paris) Schussler F. (CENG)

Ill-SCIENTIFIC ACTIVITY

Altogether 93 experiments were done in 1976, on Lohengrin (23), BILL (17), GAMS 1, 2, 3 plus Anti-Compton and Pair spectrometers (12), OSTIS isotope separator (14) and external beams (15).

A - EXPERIMENTS PERFORMED WITH EXTERNAL TARGETS

1. The experiment on alpha-particle accompanied fission of 2 3 6 U was comple­ted. The post-neutron fragment mass was determined from single fragment energy and time-of-flight measurements. About 10 5 correlated events were collected. Good fragment mass resolution and precise a-particle angular distribution were achieved (ILL, CEN-Grenoble, Saclay, Bordeaux).

2. The fragment energy correlations for the odd-even 2 3 7 N p thermal neutron induced sub-barrier fission have been measured with 2 surface barrier silicon detectors. The aim is to compare the fragment mass distribution of an odd-odd fissioning system ( J 3 8 N p ) - not measured up to now - with the well known mass distributions of even-even fissioning systems such as 2 3 6 U . About 1.2 x 10 5 correlated events were recorded. Data are being analysed at present (ILL, CEN-Grenoble, Gent, Moll.

3. The work done on the OSTIS isotope separator was as follows : the delayed neutron emission probability (Pn) values were determined for 94-96p,D

and H3-14*Cs isotopes from simultaneous neutron and lieta measurements. High quality delayed neutron energy spectra for the 93-97 Rb isotopes were measured with 3 He ionization chambers. The BNG mode, where the delayed neutron following 0-decay feeds different excited states of the final nucleus, was studied directly using a coincidence technique ; the partial probabilities of neutrons going to the different excited states of the final nucleus were obtained for the 93-96flb isotopes. High precision (> 6 keV) Qj - values of the 88.89.90,92,93 Rb isotopes were obtained with an intrinsic germanium detector. The level schemes of 143La and 1 4 3 B a were established from y-ray spectra and 7-7 coincidence work. Furthermore, neutron, beta and 7-ray measure­ments helped to determine with a good precision the half-lives of the dif­ferent accessible Rb and Cs isotopes (Giessen, ILL, CEN-Grenoble, Mainz, Glasgow, Orsay, Los Alamos).

4. The population and the decay of the 116 ns half-life shape isomer in 2 3 6 U following the thermal neutron capture by 2 3 5 U was studied with a Ge(Li) diode and an inner shell vacanoy (ISV) detector. The ISV detector helps to separate the fission events from those when there is no fission. The data analysis is not complete yet. (Cornell, Munich, ILL, ISPRA).

5. The charged particle reactions such as (n, a) and (n, p) induced by thermal neutrons, have been carried out on targets of 1 2 9 X e , 7 7 Se, 1 5 5 G d , 1 6 7 E r ,

1"Hf , 5 8 N i , S9Ni, 61(Mi, 209Bi, 132Cs, 12Sxe and 12'Xe. The last three neutron deficient nuclides were produced at the ISOLDE facility at CERN. Moreover, thermal neutron induced fission cross sections of 2 3 2 T h , 2 3 , P a and 237 Np_ and the ternary fission to binary fission ratio (LRA/B) values were obtained for 2 3 1 P a and 237N p ( I L L , Lyon, CERN, Gent, Mol, Go­thenburg).

6. The neutron binding energy of 4025.2 ± 0.6 keV for 1 3 7 X e was determined using the 1 3 6 X e (n, y) 1 3 7 X e reaction. The target was Xe gas enriched to 91.2% in 136x e (Studsvik, ILL).

7. A measurement of the asymmetry in the radiative neutron-proton capture has been performed using polarized cold neutrons on a pàrahydrogen target. The result, A» = {0.6 ± 2.1) x 10 ' 7 , is in agreement with values predicted by various theories of the weak interaction. (Harvard, I.S.N.).

8. The magnetic moment of the neutron is being measured using the split coil technique. Although the measurement is not yet finished with all the necess­ary checks, the data obtained up to now give hope for an improvement of the precision of the previous value by a factor of = 100. (Harvard, ILL, Sussex, Oak Ridge, CEN-Grenoble).

9. The Fresnel diffraction of neutrons of wave-length X = 4.33 A produced by single domain walls in a ferromagnetic foil was observed. This verified the spinor nature of the rotation of fermions (neutrons) by showing that an odd numtsi of 2ir rotations leads to a minus sign in the amplitude of the wave function. (Melbourne, ILL).

10. The work to determine the concentration profiles by (n, a) - and (n, p) -reactions has been continued. Absolute 6 Li /cm 2 and 1 0 B / c m 2 concen­trations were determined (Munich, Berlin).

B - EXPERIMENTS PERFORMED WITH INTERNAL TARGETS WITH THE THREE SPECTROMETERS BILL, GAMS AND LOHENGf.lN.

1. The isotopes studied with the (n, el-reaction with the beta spectrometer BILL were 5«Mn, 80,82a r, 1 Ur jd , H 5 | n , 122,124Sb, l i 7 N d 155s m , 168Er, 162.164Dy, 174yb, 190()s, 196pt, 20OHg, 198/^ , a n c j 249Cm, The Q-values after neutron capture in 1 1 4 Cd and 2 0 0 H g will be determined to an accuracy of about 60 eV. In the case of l 4 7 N d , p r e c j s e values of mul-tipoie mixing ratio M j / E 2 have been obtained for transitions up to 100 keV. The 0, 7 and octopole vibrational states were identified in 2 3 9 U . (ILL, Argonne, Brookhaven, Leningrad, Livermore, Lyon, Manchester, Washington).

2. Nuclides studied with the (n, ? l reaction with GAMS 1, GAMS 2/3, Anti-Compton and Pair spectrometers were 4 4 C a , 80,82p, r, 155sm, 122,124sb, 168 E r_ 162.164 D y , 174 Y b, 191.1930s, 196p t i 2 3 5 a a n d 2 4 9 C m . In the case of 4 4 C a about 70 7-ray transitions were observed below 1.5 MeV. More­over, the various types of data led to a level scheme of 8 0 B r with 55 levels up to an excitation energy of 1.5 MeV and to a level scheme of s 2 B r with 37

levels up to 1.3 MeV. A comparison between the 411.8 KeV r-ray in , 9 8 H g and the 511 keV annihilation line gave the energy of the , 9 8 H g r-ray as 411.805 ± 0.005 keV. The 2 4 9 C m K t t x-ray energies were determined to be K t t 1 = 109.271 + 0.005 keV and K t t 2 = 104.683 ± 0.005 keV. (Preli­minary value). (ILL, Argonne, Belgrade, Brookhaven, ISN, Jiilich, Leningrad, Livermore, Lyon, Manchester, Mol, Washington).

3. The mass separated fission products from Lohengrin were used in different ways to study nuclear spectroscopy of neutron rich nuclei and to get infor­mation on the fission process itself. Decay schemes from tray and yj coinci­dence data were constructed for 1 3 , S n , 1 3 6 T e , 1 4 5 C e , 1 4 5 L a , 1 4 5 B a . The (^•values for 19 nuclides with an accuracy of > 100 keV were determined from the 0-y coincidence work. The y-rays in the final nuclei reached by delayed neutrons were studied for mass chains 85, 94 and 135 with a Ge(Li) detector. The delayed neutron work on other mass chains was continued. The Z-yields as a function of fragment kinetic energy of mass chains 133 and 134 were studied by measurement of r-rays. The work on mass yields, and Z-yields in the light fragment group of 23S(j thermal neutron fission with several direct methods was continued.

The energy loss of fragments in different gases was studied with different ionization chambers. A large ionization defect in the specific ionization was observed with ?<gon gas in the chamber. A few experiments to test different experimental techniques were carried out on the separator, as for instance the collision X-rays for the identification of the nuclear charge in the heavy fission fragment group. (ILL, Brunswick, CENG, Darmstadt, Dublin, Giessen, Glasgow, Ispra, Jiilich, Mainz, Saclay).

Secretary : M. Asghar

college 4 «excitations» I • MEMBERS OF TK= COLLEGE

Castets A. (CNRS) CoeyJ. (CNRS) Copley J.R.D. Currat R. Oorner B. Escribe C. Fitzgerald W. Fogedby H. Ghosh R. Jenkin G. Lechner R.E. Loveluck J. Lovesey S.W. Parisot G. Pynn R. Rossat-Mignod M. (CENG) Scherm R. Southern 13.

(CENG)

Stirling W.G. Suck J.B. Villain J. Wagner V. Young P. Ziebeck K.

I I -VISITING SCIENTISTS

Axe J.D. (BNL) Eisenriegler E. (KFA) Grimm H. (KFA) Holden T.M. (CRNL) Joffrin C. (Léon Brillouin) KoehlerW.C. (ORNL) Lowde R.D. (AERE) Nicklow R. (ORNL) Paul G. (U.New South

Wales) Woods A.D.B. (CRNL)

III-SCIENTIFIC ACTIVITIES

Although the scientific work of College 4 involves use of a wide range of ins­truments including the time-of-flight spectrometers IN4 and IN5 and the back-scattering spectrometer IN10, it is certainly the case that the study at I.L.L. of elementary excitations in condensed matter is centred on the group of triple axis crystal spectrometers (T.A.S.). Of these instruments, I N I , IN2 and IN8 operated in a reasonably reliable manner during 1976, while IN3 was largely rebuilt and now operates most satisfactorily. The existence of the high-flux machine IN8 has allowed many studies hitherto impossible or at best extremely difficult. Unfor­tunately, the "CARINE" computer-control system continues to give problems and leads to considerable losses of instrument time. The new cold-source ins­trument, IN12, is under construction and first tests are planned for the summer of 1977.

In March and October of 1976, the members of Subcommittee 4 - "Excitations" -considered a total of 98 proposals ; this represents an increase of 40% over the figure for 1975. Of this total, the Subcommittee allocated instrument time to

68

Variable curvature monochromator for IN3

67 proposals, 32 of which were in the category "phonon dispersion and lattice dynamics" (04-011, 15 in "anharmonic effects and phase transitions" (04-021, and- 20 in "magnetic excitations" (0403). The largest increase compared with the year 1975 is in the first of these categories. Table Via lists by category the numbers of proposals submitted and accepted.

Table Via Number of proposals submitted to the meetings of the Subcommittee "Exci­tations" in 1976.

March October

Category Submitted Accepted Submitted Accepted 04-01 28 19 20 13 04-02 11 8 8 7 04-03 1 5 - 8 16 12

Table VIb Instruments used for experiments September 1976).

in the College ' Excitations' (September. 1975-

Instrument INI IN2 IN3 IN4 IN5 IN8 IN10 D5 D7 D10 N° of experi­mental periods

10 21 12 10 4 24 3 1 1 1

During the past year, approximately 60 distinct College 4 experiments have been performed, many of which used several periods on one or more instruments. Table VIb gives a breakdown of these experimental periods by instrument. As mentioned above, it is obviou: that College 4 experiments make particular use of triple axis instruments, and that the newest spectrometer, IN8, has moved rapidly to a prominent position.

Transferring liquid helium to the cryostat on IN8

With such a large number of experiments it is obviously impossible to discuss each one individually and so, as in previous reports, we have chosen several examples to illustrate the type of work at present being performed. The study of "conventional" phonon dispersion curves continues to be of interest. Measurements have been completed of the dispersion curves of the molecular crystal urea1 and detailed model calculations have been performed. Acoustic modes have been observed in both crystalline and smectic phases of the liquid crystal TBB'A2, while several groups have worked on quasi-two-dimensional ma­terials such as Hgl 23, TaS 2

4 and NaODS.

There has been increasing interest in the effects of electron-phonon interactions, exemplified by an elegant experiment on polysulphur nitride (SN) X

6 in which a sample composed of 12 tiny aligned single-crystals was used to study an anomaly in a longitudinal phonon branch ; it is probable that this difficult experiment would have been impossible on any ILL T.A.S. other than IN8. Similarly a Kohn anomaly and non-commensurate superlattice has been observed in the layer com­pound TaS2 4. The [001] and [100] phonon dispersion curves are shown in Fi­gure 11. Again, IN8 was used, this time with 7 oriented crystals of total volume < 0.01 cm 3 .

As in past years, many proposals were concerned with the dynamics of structural phase transitions. The now more-or-les! standard "central peak" has been observed near the phase transition in the improper ferroelectric RbH3(Se03}2

7, as well as a Brillouin zone-boundary soft-mode. A study has been started of the dynamics of the second-order ferroelectric phase transition which occurs in the material K|TaNb)0 3

8 ; as well as a central peak and damped optic mode there is evidence of an acoustic-optic mode interference. Other work involving the study of anhar-monic effects has been that on mode Gruneisen parameters in Potassium9, invol­ving accurate frequency-shift determinations at pressures up to 4 kbar. The pres­sure dependence of zone boundary phonons in Selenium30 has been used to improve the understanding of the nature of bonding in such semimetallic crystals. The time-off light spectrometers IN4 and IN5 were used by several groups to make phonon density-of-states measurements or to study quasielastic broadening effects. For dhcp Lanthanum11 the phonon density of states has been determined at 4.2 K and room temperature ; using this data in conjunction with tunneling results, information can be obtained on the frequency dependence of the electron-phonon coupling in such superconductors. As part of an investigation on "fast-ion" conductors using several instruments12, the quasielastic scattering from PbF 2

and SrCI2 has been investigated on IN5 ; in the latter compound there are indi­cations of a broadening, attributable to cation diffusion.

Turning now to studies of magnetic materials, we find that the T.A.S. on the hot-source, IN1, still offers an almost unique tool for the study of high energy

71

'.s

13

& c a> 3

0)

[001] [100] 2 -

* . / ' /V \J- L y y

1- \

y / T i

Ftg.11 Room temperature •coustic phonon dis­persion curves of IT2 - TaS2- The phonon anomaly in the H001 L branch has the same wave-vector component es the non-commen­surate distorted lat­tice (Instrument : IN8/IN2).

0 5 0L4. Q3 0 2 0.1 0 0.1 0.2 0.3 0 .4 0-5

Reduced Wave Vector

10 0 REDUCED WWEVECTOR

Fig. 12 Room temperature spin-wave dispersion curves of Fe3Si. (Instrument : IN I ) .

72

magnetic excitations. For example, the room temperature, spin-wave spectrum of the ferromagnetic, intermetailic material Fe3Si 1 3 has been measured out to the zone boundaries • see Fig. 12 - where the excitations have an energy of about 30 THz (~ 124 meVl. The exchange interactions can thus be determined for this substance which has different moments on the different iron sites. Another ex­periment necessitating relatively high energy transfers was that on longitudinal excitons in antiferromagnetic KC0F3 1 4 . Reasonably good energy resolution was needed for this experiment as, at a general wvevector, up to 4 distinct peaks were visible between 4 and 14 TH2, i.e. a phonon and three exciton branches.

Use was made of the other T.A.S. instruments for many other magnetic experi­ments. For example, by application of a uniaxial stress of 500 bar, a monodomain sample of COQ1 5 was obtained, thus allowing the first observation of well-defined magnetic excitations in this antiferromagnet. Previous work on a multi-domain sample produced only extremely broad neutron groups. Another antiferromagnetic material recently investigated is CoCI 2

1 6 where there are 2 low energy excitations arising from the splitting of the degenerate antiferromagnetic modes by the aniso­tropic crystal field.

A technically novel experiment on a very similar system is the study of magnon-phonon hybridisation in F e C I 2

1 7 using polarisation analysis. For this experiment the INB T.A.S. was equipped with a Heusler alloy analysing crystal, magnets and guide fields, so that a separation of "spin-flip" and "non-spin-flip" scattering could be made. Another inelastic scattering experiment involving polarized neutrons was part of the study of Pd 3 F e 1 8 carried out using the D5 spectrometer. In this case, a polarized incident beam and conventional (Cu) analyser were used to separate magnon and phonon contributions to the observed inelastic scattering. The above two experiments may lead to a wider use of polarized neutrons in inelastic scattering investigations at I.L.L.

It would be inappropriate to close this report without extending the thanks of College 4 members to S.W. Lovesey who retired from the position of College Secretary in April after 2 years of extremely efficient service to the College.

Secretary :W.G. Stirling

EXPERIMENTS CITED ABOVE

1. 04-01-O13A Lefebvre, Fouret, Currat 2. 04-02-018A Doucet, Levelut, Lambert, Porquet, Dorner 3. 0401-040 Prevot, Bellmann, Dorner 4. 04-01-078 Ziebeck, Dorner, Stirling, Schôllhorn

e. 04-01-006 Bleif, Dachs, Grimm 6. 04-01-067A Pintschovius, Currat 7. 04-03-029 Grimm, Fitzgerald, Stiller 8. 04-02-030A Courdille, Joffrin, Ziolkiewicz, Currat g. 04-02-015 Meyer, Dolling, Scherm, Paureau, Vettier, Kalus 10. 04-02-016C Teuchert, Meyer, Wendei i i . 04-01-021 Nûcker, Suck 12. 04-01-055 Dickens, Lechner

04-03-020R Dickens, Hayes, Hutchings, Ghosh 13. 04.04.052 Forsyth, Ziebeck 14. 04-03030 Parisot, Satya-Murthy 15. 04-04-040R Wagner, Geick, Ronzaud 16. 04-03-035 Escribe, Ziebeck 17. 0^03-034 Ziebeck, Escribe 18. 04-03-035 Holden, Smith, Cowley, Stirling

college 5 «structures» I - MEMBERS OF THE COLLEGE

Aldebert P. Bartunik H.D. T.U. Munchen Bauspiess W. Brown P.J. Buevoz J.L. Burger N. Cheel V. Convert P. Croset B. Feld R. Filhol A. Fitzgerald W. Freund A. Givord D. Gregory A. Hermann-Ronzaud O. Hewat A.W. Hohlwein D. Jenkin G. Klar B. Lehmann M.S. Leslie M. Mason S.A. Nunes A.C.

Ill SCIENTIFIC ACTIVITIES

During 1976, the four-circle Mark VI diffractometer D15 became available for scheduling, and has substantially reduced the load on D2, D8 and D10. Develop­ment of D6, the multi-counter diffractometer ("hedgehog"! using the modified Laue method, and of D14, the television camera scintillation detector, was halted for lack of resources. However, the first complete structure determination has been reported from D12, the photographic neutron diffraction apparatus, and recently a He cryostat has been fitted to much extend the range of materials studied on this apparatus. As well, planning has begun for D19, a new area de­tector system which will serve a wide range of users from those interested in kinetics of solid state reactions to those studying protein structure. Experiments are now beginning on the neutron interferometer D18, where it is possible for example to measure scattering lengths or study neutron waves in magnetic fields. The scheduled instrument group now includes three powder diffractometers. two polarized neutron diffractometers, three single-crystal diffractometers, D12 and the quasi-elastic scattering 4-circle diffractometer D10. Each of these has

Overs T. Parisot G. Radhakrishna Riekel C. SchweizerJ. CEN-Grenoble Soubeyroux J.L. Tasset F. Thomas M. Thorel P. Timmins P. Wilson S.A. Wolfers P. Wright A. Zeyen C. Ziebeck K.

I I -VISITING SCIENTISTS

Cooper Malcolm J. Univ. of Warwick Lander G. Argonne Fuess H. Univ. of Frankfurt Schneider J.R. H.M.I. Berlin

unique properties, and taken together with the special instruments S20 and S21, and LI2 and LI3 (the T-diffrectometer) referred to elsewhere, constitute a powerful tool for research using diffraction techniques. For "its successful functioning, the ILL will continue to depend on close cooperation with users as is well illustrated by the study on D10 of the phase diagram of CsMnCI32D20 in skew magnetic fields using a superconducting magnet and a cold Eulerian cradle. Below we sum­marize some other recent results. High-resolution neutron powder diffractometry has much enlarged the range of substances whose structural phase transitions may be followed. Work has been possible on the influence of pressure on ferroelectric K H 2 P 0 4 , the structure of uranium and its oxides at high temperature, and the structure of naphthalene at 25 kbar. Hydrogen bromide, methanol and ammonia have been examined at low temperature. Work on resorcinol shows that it is now possible to refine meaningfully as many as 140 structural parameters from a neutron powder pattern. The linear multidetector DIB remains uniquely versatile. Suspected phase tran­sitions may be verified in a matter of hours or even minutes, and the courses of solid-state reactions are now routinely followed by recording changes in the dif­fraction pattern of the system. Further, new results are being obtained in studies of the diffraction from mono- and bilayers on surfaces e.g. Kr/graphite or Ar/Mnl2. Detailed studies of magnetic structure continue : thus FeU 2S 5 orders antifer-romagnetically at about 250 K, the uranium atoms having a small ferromagnetic component. Below 30 K, the uranium orders progressively and modifies the ma­gnetic moments of the iron atoms. On D1B also, several phase transitions of rare-earth oxides bave been followed in the temperature range 1800 to 2500 tC.

Several studies bearing on extinction in single crystals have been completed. Work on yttrium iron garnet has shown that by measuring flipping ratios it is possible to scale directly structure amplitudes measured at different wavelengths. This promises to be a powerful technique for the future. In another study, plastically-deformed single crystals of Cu were examined on the ?-diffractometer and also with short-wavelength neutrons. A "peanut-shell" shaped mosaic distribution accounts successfully for both the y and neutron results whereas a conventional ellipsoidal model does not. Hot neutrons were also indispensable for the location of interstitial F atoms in several disordered phases of YF3 enriched NaYF 4 . The electron density in the short symmetrical hydrogen bond in sodium hydrogen acetate was studied at 90 K by combination of accurate X-ray and neutron dif­fraction data. The effect c.f neglect of T.D.S. in such work is now being inves­tigated.

Much work on phase transitions has been completed, including correlation of the structure of the improper ferroelectric RbH3(Se03)2 with the dynamic properties of the crystal ; and very precise measurements in the critical temperature region for several ferroelectrics using the S21 instrument. The high flux, low background.

and high resolution of D10, operating in the 3-axis mode, made possible the first neutron observation of Huang scattering in neutron-irradiated MgO and r-irradiated 6LiF. Polarized neutron diffraction continues to provide new results. A study on 03 of the magnetization density in partially ordered AU4V shows that the moment is confined to the vanadium sites and hence confirms that vanadium atoms in contact do not have a moment. ExperimeiuS on CoF 2 show that a single 180°-domain antiferromagnetic crystal can be produced under the combined action of pressure and magnetic field. Thus the magnetization distribution of both the magnetoelastic moment and the covalent moment can be determined. An ex­periment on SmCog has shown the feasibilities of studying natural samples (not isotopically depleted) containing Cd, Gd, Sm, etc. by using wavelengths below 0.5 A on D5. The spin density of the N-0 free radical in a single crystal of tanol suberate, the first known purely organic ferromagnet, has been studied. In con­clusion we mention the study of the scattering of polarized neutrons from dyna­mically polarized protons in hydrated lanthanum magnesium nitrate. It has been shown conclusively that the polarization within the sample is inhomogeneous, possibly due to temperature or microwave field gradients in the crystal.

Secretary : S.A. Mason

college 6 «liquids,gases and amorphous materials» I - MEMBERS OF THE COLLEGE

Besnard M. • BelHssent M.C. BlétryJ.H. Carlile C. Chieux P. Copley J. Dianoux A.J. Heidemann A. HigginsJ. Hilton P.

II-SCIENTIFIC ACTIVITIES

HowellsW.S Jal J.F. Klein M. Knoll W. Lechner R. Lovesey S. Marti C. Poncet J.F. Scherm R. Suck J.B. Volino F. Wright A.

As a general trend we might say that 1976 has been characterized by the develop­ment of some highly successful programmes of which a short review is given below. On the other hand there is a non negligible amount (say about 25%) of experiments performed at the limits of either the present state of the theory or of the technique. Unless significant breakthroughs are made, these are often not reported but they are nevertheless characteristic of the actual scientific effort ; a few titles : collective excitations in general, inelastic or quasielastic studies of superionics, glasses, amorphous systems, molecular liquids, binary alloys, extreme temperature or pressure conditions, critical phenomena.

Two meetings have been organized. In March, an informal gathering of all the users working on binary alloys was the occasion to define priorities and to develop e general framework for research in the field. This should be considered as a main success considering the omnipresent dilemma between specific metallurgical problems and general scientific interest. In October, the week of the Scientific Council, a workshop on ionic systems clarified the experimental difficulties to be overcome and reassessed the priorities in this area. Both meetings should be considered extremely fruitful for the promotion of closer collaboration among users, defining priorities and drawing guidelines for instrumental developments.' We hope in the future to systematically hold meetings in the different scientific areas covered by the College.

2.1 - Quantum liquids

The programme of work on the excitations in liquid helium has continued during the past year. Although liquid 4 He is certainly one of the most studied of materials, neutron measurements can still produce valuable information. Using the IN5 spectrometer, a high-resolution measurement has been made of the small-Q phonon dispersion curve in superfluid 4 He. Since long wavelength neutrons (6 to 8 A) could be used, giving improved energy resolution and smaller wave-vectors than hitherto possible (~ 0.C7 < Q (A - ' ) < 1.0), a direct observation of the anomalous dispersion was made. In a second experiment, the pressure depen­dence (0 < p (bar) < 20) of the dispersion curve has been investigated. Another high resolution measurement, this time using the IN3 instrument, was the ac­curate determination of the roton energy at the saturated vapour pressure. By comparison with Raman scattering measurements it has been possible to verify the existence of a two-roton bound-state and to define its binding energy.

Finally, a study has been made of. the excitations in thin films of superfluid 4 He. In a first experiment, graphite powder was used as substrate. Excitations could be observed in films of 3 layers and th:r:ker. A second experiment used oriented "papyex" as substrate. As with the first experiment, no appreciable change occurred in the roton energy compared with bulk helium.

Turing to the lighter isotope 3 He, measurements have been made at improved resolution of the excitation spectra of several mixtures of 4 He in 3 He. The figure 13 shows the excitation spectrum of a 6% ('He) mixture. The particle-hole con­tinuum and single pnonon-roton dispersion curvt merge at about 1.7Â' 1 ; it is not possible to say definitely whether the continuum is below the roton curve, but it certainly deviates from a strict quadratic dispersion.

2.2 - Liquid metals

A large programme which complements previous inelastic experiments has now been completed on liquid Rubidium and should improve our understanding of liquid metals. The structure factor has been measured with an increased ac­curacy over a large k-range, the main peak of the structure factor itself being investigated over a temperature range from 450 K to 1400 K which corresponds to a density variation from 1.42 to 0.98 g/cm3 i.e. approaching the critical con-diti MS. The pressure derivative of S(Q, to) has been successfully obtained and will allow models of the triplet correlation function to be tested.

2.3 - Binary alloys

Previous work on Li alloys using the Bhatia and Thornton formalism and the

20.0-

15.0

« 10.0

7"

• ' ' '*A. v

/

.#'

^ .s

18

16

U

12 -^

.1 0.6 c

B

0-6 &

ï 0.4 UJ

0.2

05 20 r 10 15 Woveveclor transfer

Fig. 13

Experimental end theoretical excitation of 6% 3He-4He. The closed circles are the positions of the phonon-roton peaks, the triangles show wher5 these peaks reach the background level, while the open circles give the positions and widths of the particle-hoie continuum peaks.

"zero al loy" technique has been extended to a detailed study of the Li-Ag and

Li-Na systems.

Segregation effects are investigated in detail for some binary systems such as

Al-Sn.

New single crystal sapphire containers, successfully tested in the case of Fe-C

(5% C) will probably open the way to the study of higher melting peint alloys.

2.4 — Magnetic form factor

The interest in magnetic form factors of simple fluids has been sustained. De­

pending on experimental conditions several approaches are now being used in order

to separate magnetic from nuclear scattering : polarization analysis (liquid iron),

isotopic substitution (liquid iron) comparison between similar systems (nitrogen

versus oxygen gas). Moreover small angle scattering attributed to spin fluctuation

has been observed in liquid iron.

2.5 Molecular liquids

By a systematic study of molecular liquids in the high k-range and at several

wavelengths (or incident energies) a deeper understanding of the inelasticity corrections as well as better values of the intramolecular structure factor has been reached. This has a direct effect on the quality of the inter molecular structure factor determination and comparison with new theoretical approaches such as the RISM model is very promising.

2.6 - Molten salts

The work on partial structure factor determination of molten halides was success­fully extended to RbCI and CuCt. The available statistical accuracy seriously limits further development of the isotopic substitution method and an increased data collection rate such as provided by the multidetector technique is necessary. Critical fluctuations were observed near the liquid-liquid demixing point in the system K in molten KBr. The system seems to behave classically even at tem­peratures very close to T c .

2.7 — Ionic solutions

Continuing progress has been made in the use of isotopic substitution to investigate concentrated ionic solutions in DjO. Solvation effects have been investigated as a function of concentration for the Nickel ion in NiCI 2 and the Chloride ion in NaCt. Preliminary work as a function of temperature and especially pressure also allows very interesting quantitative information on solvation to be obtained in these cases.

2B - Mesophases

Incoherent neutron quasi-elastic scattering of different smectic phases in powder or aligned sample suggest that the accepted model for local order in these phases is not very adequate. The" work has therefore focused on well defined experiments especially in the smectic C and A phases. Using extensively the Elastic Incoherent Structure Factor (EISF) it was shown that the neutron results do not support the existence of an orientational ordering around the long axis as predicted by numerous microscopic theories. Moreover in the smectic A phase, the picture of molecules arranged perpendicular to the smectic plane seems to be incorrect and this is investigated in more detail.

Similar experiments using the EISF concept have proved to j e a powerful tool to distinguish between different types of rotational motion in plastic adamantane. The smectic C - smectic A transition has been accurately investigated. The t i l t angle and its corresponding critical exponent 0 were followed by a method based on rocking curves.

Secretary : P. Chieux

81

college 7 «impurities» I - MEMBERS OF THE COLLEGE

BletryJ. CarlileC.J. Escribe C. Freund A. Goeltz G. Grupp M.

Hayter J. Heidemann A. Heitjans P.

JustW. Kôrblein A. Kostorz G. Mezei F. Murani A. Parisot G. Rachakrishna P. Roth M. SchweizerJ. Stirling W.G.

Univ. of Heidelberg

Univ. of Heidelberg

C.E.N.G.

Univ. of Wiirzburg

Suck J. Thorel P. Wagner V.

Young A.P. Zeyen C. Ziebeck K.

I I -VISITING SCIENTISTS

Anders R.

Fujara F.

Hicks T.

Sôffge F.

(Stierstadt, Mûnchen) (March 76) Univ. of Heidelberg (May 1976) Lucas Heights, Australia Univ. of Mûnchen

III-SCIENTIFIC ACTIVITIES

Out of 99 proposals submitted to the subcommittee in March and October 67 were accepted. A total of 67 experiments concerning this college were carried out in 1976. The instruments used were IN I , IN3, IN4, IN5, IN7, IN10, D7 and D11A. The small angle and diffuse scattering spectrometers D11B and D17 are now in the test phase. They should become operational in 1977 and will then reduce the load on the heavily demanded machines D11A and D7. Present areas of re­search interest in the college fall into three categories :

1. Mixed magnetic systems, 2. Defects and disorder in solids, 3. Diffusive motion in solids.

A great effort was concentrated on the investigation of spin glasses. Diffusion and dynamics of superionic conductors is a field of increasing interest.

1. Mixed magnetic systems Magnetic diffuse scattering of unpolarized neutrons with energy analysis was studied to determine the spin-spin correlation function in space and time for several systems exhibiting various unusual magnetic properties, namely Kondo, Intermediate valence and spin glass behaviour. In the rare earth Kondo alloys CeLaAl2 and CeYAl2 and the "Kondo compound" CeAl2 the concentration and temperature dependence of the quasielastic and in­elastic line width of the crystal field split C e 3 + ions was investigated. From the data an increase of the Kondo temperature from CeLaAl2 to CeAl2 and to CeYAI2 was inferred. In the intermediate valence compound CePd3 an abnormally large and almost temperature independent quasielastic line width and a reduction of the total magnetic cross section was observed indicating only 0.5 electrons in the 4 f shell. In the classical spin glass system AuFe the existence of two species of magnetic moments with different sizes and re­laxation rates above the freezing temperature was deduced from inelastic neutron scattering. (M. Lowenhaupt, E. Holland-Moritz (KFA Jùlich), F. Steglich, H. Scheuer (Universita't Kôln), W. Just (ILL)). Measurements of the dynamics of spins in a Cu 8 at. % Mn alloy (A.P. Murani (ILL), J.L. Tholence (CRTBTI) show no evidence of critical slowing down normally associated with a second order phase transition which is predicted for spin glasses by some recent theories. Also, the temperature of the maxi­mum in the susceptibility is found to be dependent on the time constant of measurement, the neutron scattering data (time constant ~ 1CH s) yield- • ing a significantly higher value compared with that obtained by the con- -ventional ac susceptibility technique (time constant ~ 10"2s). The temperature dependence of the hyperfine interaction on the vanadium sites in V 3 0 7 was studied on IN10. A phase transition at 5.2 K was detected (A. Heidemann (ILL), K. Kosuge (Kyoto)).

2. Defects and disorder in solids Small angle scattering from AlZn was investigated at high temperature and after aging at room temperature to study the supposed changes in decom­position mechanism from spinodal to nucleation-and-growth. An interparticle interference peak of the AI-6.8 at % Zn alloy aged at 133°C was observed at very small angles (D. Allen, R. Stewart (Reading), P. Guyot, G. Lasiaz (Grenoble), M. Roth,G. Kostorz (ILL)).

The study of irradiated GaAs has been terminated and the results are available in a thesis by S. Gupta (S. Gupta, E.U.J. Mitchell, R. Stewart (Reading) G. Kostorz (ILL)). The anisotropy of neutron small angle scattering after fast neutron irradiation of a single crystal was attributed to the shape of

83

the displacement cascades. A programme on Ni based high temperature alloys has been started. The small angle scattering caused by precipitates was studied as a function of aging temperature and time, and uniaxial stress as an additional parameter (R.Miller, R.Stewart (Reading),G. Kostorz (ILL)). The small angle scattering from faceted voids in O'-NiAl was studied further. Model calculations are under way to interpret the results (J.E. Epperson (Stuttgart),G. Kostorz (ILL)).

3. Diffusive motions in solids

The study of hindered diffusion of hydrogen in Nb by quasielastic neutron scattering on IN10 was continued. Despite some experimental effort the predicted tra.islational tunnelling motion could not yet be dectected (D. Richter, T. Springer (KFA Jûlichl). The single particle motion in single crystalline Na was investigated on a microscopic scale by quasielastic neutron scattering on IN10. In general the results are compatible with the model of <111> - jumps for mono-vacancies but there are also characteristic differences which are probably caused by the motion of divacancies. Further work is in progress (A. Seeger (MPI, Stuttgart), G. Goeltz, A. Heidemann (ILL)).

4. In-Beam NMR spectrometry Studies of the electronic structure and atomic diffusion in L[Mg, LiAg and LiCd alloys were performed on the in-beam NMR spectrometer (S6, Heidel­berg group) by measuring the temperature dependence of the spin-lattice relaxation time Jy of 8 L i .

An information meeting on hydrogen in metals 'organized by W. Just, T. Springer) took place on January 23, 1976 at the ILL >>e aim was to gathr,-the various groups which have used the HFR facilities for investigations on hydrogen metal systems, in particular the aspects of self-diffusion, lattice vibrations, structure and density fluctuations. The general aspects were Relation between local modes and the activation energy for diffusion, thr.< influence of the strain field on local density fluctuations of the dissolved hydrogen atoms, diffusion in the presence of traps, direct hydrogen-hydrogen interaction, physical aspects of hydrogen storage in rare earth compounds and in Mg alloys. At the end of the meeting and after a general discussion, the different groups sketched their future programme, in particular at the ILL reactor.

Secretary : A. Heidemann

college 8 «structural biology» I • MEMBERS OF THE COLLEGE

at I.L.L. Bartunik H. Chauvin C. Dianoux A. Haas J. Ibel K. Jacrot B. Mason S.A. TorbetJ. Timmins P.

CENG

Euratom

White J.W. ZaccaiG.

at the E.M.B.L. outstation : Berthet C. Gabriel A. Hulmes O.J.S. Lindley H. Miller A. Ngo Tri H. Tocchetti D. White S.W.

EMBO Fellow

EMBO.Fellow

II-SCIENTIFIC ACTIVITY

Of the. /2 proposals submitted to the Biology Subcommittee of the Science Coun­cil for the two six-month periods of 1976, 53 were accepted. Most were for low angle scattering work using D11A, but there were proposals, as well, for D8 (pro­tein single crystal), D16 (membranes) and IN5, IN10 (inelastic studies). The subcommittee continued the principle of test time on instruments for quick experiments to see whether or not more elaborate studies of a system were war­ranted. It proved to be very successful, with most test experiments leading to well formulated proposals which were subsequently accepted.

In the low angle field, the long term studies on the structure of ribosomes and chromatin are continuing, their progress emphasized by the publications in each subject. In particular, it has been shown that in both the 50s and 30s nbosomal subunits the RNA is located towards the core of the particle with the protein more to the outsic'e. In the chromatin nucleosomes, it has been shown that the protein is locatedtowards the core with the DNA on the outside. The first studies on spherical viruses are now completed. They showed a strong correlation between protein RNA interpénétration and stability in those viruses. The work on the retinal rod outer segment membranes has also been completed and published this year. Using contrast variation, the rhodopsin was found to span the btlayer with small changes in its position on bleaching. Another interesting study, which shows the unique advantage of neutrons for certain structures, is the one on calcified tendon. Calcified tendon is essentially made up of collagen and a calcium mineral. Whereas with X-rays, calcium strongly dominates the scattering, with

85

neutrons, its contribution is comparable to that of collagen. This study located the mineral relative to the collagen in the structure. It is the first example of the successful use of contrast variation in a noncentrosymmetric system. The sensi­tivity of the neutron technique is clearly demonstrated in a study which has been started this year on aminoacyl-t-RNA-synthetases and their interactions with t-RNA. Complex formation between the enzymes (molecular weights bet­ween 1 x 10 s and 2 x 10 5) and the t-RNAs (molecular weights ~ 2.5 x 104> and subsequent dissociation as the stoichiometry is varied have been followed by observing the changes in scattering in solvent conditions where only the enzyme contributes and where both the enzyme and the nucleic acid contribute.

A number of inelastic experiments have been performed in 1976 but it is pre­mature, as yet, to comment on their results except to say that they show the technique to be worth pursuing.

In the single crystal field : At their March meeting, the subcommittee strongly backed protein crystallography as a long term project at the institut, and demanded that an area-sensitive detector be developed to speed up data collection. In the meanwhile, the work on lysozyme is continuing on D8. Preliminary tests (on D17) on virus crystals (unit cell dimensions ~ 400 A 3 ) to estimate the feasibility of a low resolution study to locate the nucleic acid core have been very promising.

An important event in college life, this past year, has been the installation of the Biochemistry Laboratory under the responsibility of B. Jacrot. It is small but well equipped with, amongst other equipment, a spectrophotometer kindly provided by the E.M.B.L. tt has greatly enhanced the quality of experiments on the beams, by allowing last minute sample preparations and controls under much improved conditions. The college has a close and excellent collaboration with the E.M.B.L. outstation, and it is hoped that now long term visitors will be attracted to the Institut for biological work.

Secretary : G. Zaccai

college 9 «chemistry»

CENG

CENG

I - MEMBERS OF THE COLLEGE

Aldebert P. Sartunik H. -Besnard M. Bomchil G. Carlile C. Chauvin C. Chieux P. Dianoux A. Duée E. Fitzgerald W. Ghosh R. Guillermet J. Hayter J. Higgins J. Haas J. HowellsS. Ibel K. Jacrot B: Jenkin G. Lajzerowicz J. Lehmann M. Leslie M. Lovesey S.

Univ. de Grenoble

Mason S. Mathieu J.P. CENG Mezei F. Nunes A. Osborne H. CENG Perry C. MPI, Grenoble Riekel C. Rustichelli F. Schmidt G. Tabony J. Timmins P. Tomkinson J. White J. Wright A.F. Volino F. Zaccai G.

I I-VISITING SCIENTIST

James 0. (University of Queensland, Australia)

III-SCIENTIFIC ACTIVITIES

During the past year 100 experiments have been carried out by this College on 13 different instruments. The most heavily used instruments continue to be :

DIB 6 experiments 39 days D11 21 experiments 38 days IN1B 9 experiments 29 days IN4 8 experiments 33 days IN5 20 experiments 49 days IN10 26 experiments 69 days

A meeting of the European groups studying polymers was hcid again this year at Strasbourg in May. Results on small and wide angle neutron scattering as well as quasielastic neutron scattering were presented.

In polymer mixtures values of Rg have been measured both in the middle and at

87

the edge of the compatibility range {Mainz group).

For polymer solutions, it is now possible to describe the whole temperature-con­centration system by a universal function and the predictions for the critical region have been confirmed experimentally (Saclay group).

Work on block polymers in solutions with varying contrast factors has measured the classical parabolic variation of Rg (apparent) with contrast for a number of systems. Inelastic scattering from n-alkanes ^ - € 3 3 ^ 3 ) has shown that there is quasielastic scattering in the C modification. The translational component of the motion is not controlled by the flip-flop process but by an additional kind of motion unknown up to now in which the time constant is 1.3 x 1 0 s sec. (Fischer, Ewen and Richter, Julien).

In the field of molecular dynamics, the year was marked by the successful measure­ment of tunnelling spectra in two different systems using the IN10 backscattering spectrometer. The spectrum for the N H 4

+ ion in NH4CIO4 showed five pairs of side peaks whose positions could be measured as a function of temperature

e:.£RGY TRANSFER

Fig. 14

Tunnelling spectrum of NH4CIO4 as a function of tempe­rature measured on IN10. (Alefeld, Huiler, Prager and Press, Julien).

(see Fig. 14). The energy level scheme has been unambiguously determined and the intensities established the degeneracies (Julien group). The spectrum for dimethyl diacetylene (hexadiyne) showed a single pair -of peaks corresponding to the lowest torsional level at ~ 1 ueV. Again, as the temperature increased tht side peaks eventually merged into the central quasielastic peak (Oxford group).

Work continues on the structure and dynamics of adsorbed species. The system NH3 on graphon has been measured on D1B and IN10 and shows that the gas clusters around certain aGtive sites with properties reminiscent of the liquid state. Varying the temperature of the sample produces a sc;id-liquid transition, close to that of bulk NH3, which is associated with the rapid diffusion of the N H 3

molecule.

Experiments on the IN1B Beryllium filter spectrometer concerned the supported catalyst Pt-zeolyte and the powder Pt black. Results from the 2eolyte indicate the breaking of Sï-0-Si bonds by atomic hydrogen, while the Pt black results appear to be similar to those from the Pd-H system (Durham and Lyon groups).

Other experiments on IN1B include vibrational studies of some bisbiacetate salts, which confirm the infra-red measurements, and some hydrogen bihalides, where the energy transfers were higher than previous measurements.

Work on IN4 concerning the internal torsional modes of methyl rotors has led to very well resolved spectra and the confirmation of previous results (Durham group).

Secretary : Spencer Howells

european molecular biology laboratory, grenoble The E.M.B.L. Grenoble Outstation was started in September 1975. The raison d'être of the Outstation is the High Flux Beam Nuclear Reactor at the Institut Laue-Langevin. The purpose is twofold, viz. to provide a compact yet compre­hensive biological/biochemical laboratory which will be useful to scientists car­rying out scheduled experiments at I.L.L. and to initiate a programme of research which involves the application of neutron scattering to problems of biological interest. The E.M.B.L. is in the grounds of the C.E.N.G., some 300 m from the Neutron Guide Hall. In January 1977 the gate through the C.E.N.G. security fence will be operable by the I.L.L. magnetic cards.

The service aspect of E.M.B.L. will be run in close collaboration with I.L.L. The intention is to provide a laboratory where visitors can carry out last minute spe­cimen preparation or specimen assay both before and after neutron experiments. Internal or external I.L.L. users are invited to use the E.M.B.L. facilities and, if required, E.M.B.L. staff will provide whatever assistance may be necessary for the successful completion of neutron experiments on biological materials. A list of the equipment available can be obtained from the E.M.B.L. office {ext. 3237). Since the I.L.L. schedule is known well in advance, it is requested that prospective users of the E.M.B.L. give two weeks notice so that staff have adequate time to ensure that the appropriate equipment is working in the correct configuration. Some- E.M.B.L. equipment is actually situated in the I.L.L. under the supervision of Dr. B. Jacrot.

The research programme is at present confined to biological fibres, primarily connective tissue and muscle. It is clear from recent work that the amino-acid sequence of the collagen molecule,which is determined directly by the order of nucleotides in the O.N.A. coding for collagen, in turn determines the axial shift (of 670 A) which occurs between neighbouring molecules when they self-assemble into collagen fibrils. The small-angle X-ray and neutron diffraction patterns can also be related to the molecules of known amino-acid sequence staggered by 670 Â with respect to each other. The one-dimensional character of these biological fibres has permitted an understanding of the structure of a native animal tissue (tendon) to virtually amino-acid resoluthn in one-dimension. This is being used as a basis for interpreting the structure of modified connective tissue such as bone, cartilage and aorta wall.

Exploratory studies are also being carried out by A. Miller (E.M.B.L.I, J.W. White (I.L.L.) and collaborators on the inelastic scattering of neutrons and light by

biological fibres. These measurements of molecular dynamics give information about the microscopic elastic moduli of the molecular components and, of course, these are precisely the aspects of biological fibres which are related to their struc­tural role in biomaterials.

A project has been started by H. Lindley (E.M.B.L.) to determine the amino-acid sequence of the rod portion of the myosin molecule of muscle. This should, by analogy with the collagen work, provide the basis for analysis of the axial intermolecular contacts 4n myofilaments which can be supplemented by similar kinds of studies on the structure and dynamics of muscle.

The staff of the E.M.B.L. consists of five scientists and seven technicians and research assistants. Further appointments remain to be made and will probably broaden the research programme.

A.Miller

technical services

project office 1. In close collaboration with the instrument group coordinators, the Project

Office organises the preparation, administration and control of the investment budget for the experimental activity :

1.1 Improvements have been made on a total of 29 instruments in operation, including major modifications on 12, i *,• ng from the improvement of conditions of use or an increase in measuring range (increased number of detectors on IN5, reconstruction of IN7, improvements on D10, etc.), to satisfying safety standards (new X-ray generator on LI5), and reducing the neutron background as was the case on D16.

1.2 At the same time the new small-angle scattering spectrometer D17, the 3-axis spectrometer IN12, the neutron interferometer D18 and the new ultra-cold neutron source have been partly financed this year.

2. On the technical side, apart from coordinating and fallowing up the construction of the new instruments mentioned above, the Project Office has assisted scientists in th3 preparation of preliminary projects for high resolution instruments such as IN10B and IN13 and the time of flight spectrometer IN5B.

3. In connection with the general improvement of equipment the Project Office has defined, coordinated and financed a programme of measurements to determine the characteristics of shielding material to reduce the neutron background.

Finally the Project Office is assessing the amount of modifications necessary to some instruments or new equipment to enable scientists to work at the ILL with alpha emitting isotopes in acceptable conditions of safety.

mechanical construction and maintenance section The section has been active in the fields of new instruments, maintenance of

instruments in operation and in the improvement of instrument operating conditions. The trend has been towards greater flexibility, faster operation and increased standardisation of components, which has so far given excellent results.

1. New instruments at design, construction or installation stage : D18A, IN12, PN5 (ultra-cold neutrons), D13C completed : IN7, IN11, D17, S13.

2. Additional equipment on : D1B, D4, D9, D11 A, D11B, IN8, PN2.

3. Major modification or maintenance work on : D1A, D2, D3, D5, D7, 09, D10, IN I . IN3, IN5, IN9, IN10, D16, neutron guides for IN5 and I WO, distribution guide for H16.

4. Installation of special instruments : S4, S12, S25, S28, S29, S30, S31.

5. Installation of new neutron guides for :D18, IN11.PN5.

6. Construction work : walkway for IN11/IN12, beam shutter control units, "casemate" for background tests.

7. Tests on equipment involving new techniques : — high-pressure enclosure for multidetector — aerostatic collimator — piezo-electric positioning — differential airtightness labyrinth.

In addition, increasing technical assistance was given, with the provision of new equipment and the loan of measuring and control instruments.

safety and radioprotection section GENERAL SAFETY 1. Safety studies for the Commission Interne de Sécurité (CIS)

Safety analyses and studies of experimental instruments used for irradiating radiotoxic samples, for example : OSTIS, PN2, PN3 (experiment with 244Cm}, D5 (experiment with 242p u}, S10 (uranium targets).

2. Establishment of the regulations necessary for improving working conditions and protecting staff Measurements of harmful effects Measurements of noise and lighting in the PDP 10 room in the neutron guide building.

3. Organization of the Health and Safety Committee (CHS)

93

Examination of work-places, investigations and reports on industrial acci­dents, annual report to the factory inspector, etc.

4. Prevention of accidents Inspection of installations, regular tests on detection systems (fire, flood, explosion, etc). Extension and improvement of the remote alarm system (in the reactor and in building ILL11). Design and construction of an automatic extinction installation for the reactor ventilation filters. Design of a smoke detection system for the computer rooms -Observance of French regulations on periodical tesis and checks on ins­truments using gas under pressure, electrical installations, handling equip­ment, etc.

5. Training and information of staff Training and retraining courses for staff on the practical aspects and regu­lations on equipment for lifting and handling. Training of staff in the use of first aid equipment.

6. Maintenance and checking of emergency equipment Extinguishers, breathing apparatus, individual protective equipment, etc.

7. Control of dangerous samples Assistance to scientists on the control and storage of these samples.

8. Technical aspects of control of access Implementation of the automatic control system for access to the reactor. Extension of the system to the entrance of the swimming pool hall.

RADIOPROTECTION 1. Radioprotection in the installations and ground the experiments

Daily checks on shielding and on irradiated samples, barriers, information and assistance to the scientists and technicians. Periodic checking and sampling (every cycle) of the radioprotection moni­toring circuits (reactor and detritiation).

2. Laboratory analyses Gamma spectrometry of liquid and gaseous samples associated with the operation of the nuclear installations (routine and preventive analyses), D2O and H2O circuits, vacuum pump oil, beam tubes, etc. 600 analyses on liquid samples, 300 on gaseous samples. Analyses by liquid scintillation : 3500 samples analysed in 1976 (D2O and H2O circuits, liquid effluents, pump oil, urine, smear tests, etc).

3. Dosimetry of staff Distribution and control of films, evaluation of the results.

6000 films distributed in 1976 :5000 individual films and 1000 for dosimetry of the environment. 1200 films distributed to non-ILL staff (guest scientists and outside firms). Installation of thermoluminescence dosimetry for staff not working regularly in the reactor and for the environment.

4. Preparation, follow-up and control of work in radioactive areas All decontamination work.

5. Checks and monitoring of liquid and gaseous radioactive waste Analysis before and during disposal, monthly summaries, liaison with the CENG department concerned with aspects of site monitoring.

6. Sorting, processing and control of solid and liquid radioactive waste before their transportation and processing at the CENG.

7. Assistance of Radioprotection in connection with reactor operation problems Leak detection study : surface contamination of the fuel element plates. Start-up source : optimisation of irradiation of the source. Stability measurements of the neutron flux. Analysis of the powsr chamber drift. Analysis of tv;a radiological consequences of an accident in the detritiation plant.

8. Assistance of Radioprotection in connection with experimental operation Studies for the reorganisation of rooms and experimental instruments for work on highly radiotoxic products (transuranîc elements, alpha emitter laboratory, cell for canal 0, nuclear physics instruments PN2, PN3, etc).

9. Radi protect ion assistance to the Project Office Assistance in planning shielding around new experimental instruments. Tests an conventional shielding materials to define their efficiency as regards radioprotection (gamma + n) and background noise (r^h and n e p j t n ) . Activation analysis of the ultra-cold neutron structures to permit a better assessment of the corrosion and shielding aspects. Background noise measurements (Commission on background noise).

10. Training of staff Weekly information meetings on radioprotection for all staff.

11. Safety checks Assistance to the shift supervisor at night and weekends. Systematic checks on working areas, inspections and checks for contami­nation in all the installations. Inspections at the request of the shift sursrvisor (reactor installations) or the scientists (experimental instruments).

production, fittings and maintenance 1. The mechanical engineering and sheet metal workshops, with the same funds

as the previous year, carried out approximately 10,000 hours of work which covered 300 requests, divided as follows : 80% for the experiments, 10% for the reactor and 10% for general requirements. The most noteworthy jobs were a major contribution to the construction of new instruments and the modification of existing ones, details of which are given under the heading "mechanical construction and maintenance section".

2. The "self-service" workshop has been used regularly, as in the past, by about 10 technicians under the supervision of a skilled woikma'n, doing mechanical engineering jobs themselves. Although this workshop is on a small '.cale because of the funds available, the quality of the wo/k has increased consi­derably this year and makes a major contribution to tl;e work required for the experiments.

3. The "special products" workshop, with 1 employee, has continued to pro­duce the usual radioprotection materials (polyurethane/boron carbide, lithium fluoride scintillators, etc).

4. The general "primary materials" store continues to be operated by 1 em­ployee for all the requirements of the Institut.

fittings and maintenance The activities of this group are in the following fields : 1. Design studies, ptacing orders, checking work given to outside firms for new

work or major maintenance or modifications to existing installations. This work amounted to 1,400,000 F and about 50 firms. The most important items were the new security building at the entrance to the ILL, the safety and radioprotection building for sorting and storage of radioactive waste, the installation of equipment to improve the cosine 0 and hence the ef­ficiency of the electrical installations and the emergency supply (150 KVA) for the computers.

2. Part or all of the associated fitting and equ ipment work.

3. Connections to liquid networks and minor associated work for the experi­ments at the request of the scientists.

4. AM handling and transportation within the ILL and to some extent outside.

5. Maintenance and repair of the general technical installations, partly by ILL staff and partly by outside firms. In 1976 this sector caused a considerable increase in the workload because of the general aging of certain installations (lifts, goods lifts, cranes, conduits for liquids and effluents}.

6. Ensuring that installations conform with the appropriate safety regulations.

96

V

and work to improve safety conditions in general.

7. Cleaning and general maintenance of buildings, green spaces and roads by external contracts.

8. Organisation and maintenance of the general furniture for the whole Institut.

» j £ a 3 a a ^ . « M r t B M C ^ ^ a . a i i ,

New security building at the entrance to the ILL.

^ - T 97

reactor operation and instrument support services reactor operation In 1976 The reactor operation schedule was prepared in December 1975 for a total of 6 cycles in 1976. As far as possible the cycles were kept uniform, (starting on a Tuesday with the shut-down on a Thursday).

ACTUAL TIME TABLE Cycle 1-76 : - commenced 6 January, ended 19 February 1976.

There was no noteworthy incident except for an evacuation of the experimental haii on 18.2.76 due to a slight atmospheric contamination (1/100 of maximum permissible concentration! as a result of a leak on PN1. No contamination of staff was found.

Cycle 2-76 : - commenced 2 March, ended 15 April 1976. No noteworthy incidents except for one shut-down followed by an immediate restart. There was also a slight contamination of the swimming pool hall as a result of a source manipulation in canal 0 (PN3) on 1 March 1976. 3 persons received slight external contamination (less than 1000 c/s). An identical incident occurred on 8 April 1976 (external contamination of two operators).

Cycle 3-76 : - commenced 27 April, ended 10 June 1976. No noteworthy incident except for two shut-downs followed by immediate restarts.

Cycle4-76 : -commenced 22 June, shut-down delayed until 8 August 1976, to make up for 48 hours lost during the cycle. During this cycle there were a number of shut-downs gene­rally followed by immediate restarts, except for the shut-down of 4 to 8 July resulting from damage to a cooling circuit. The main cause of these shut-downs was numerous power supply voltage reductions due to storms.

Cycle 5-76 : — commenced 17 August, ended 2 October 1976. The shut-down was delayed by two days to compensate for a shut-down followed by a Xenon poison-out.

During this cycle also there were a number of shut-downs resul­ting from power supply voltage reductions. There was also a contamination incident in the experimental hall due to a leak on the instrument PN1 (Lohengrin) on 27 August 1976. The level of atmospheric contamination inside the-hall reached 02 of the maximum permissible concentration (2.10-7

. Ci/m3). The hall was evacuated for a period of about 5 hours. 25 persons who received external contamination (less than 300 c/s) had to take a shower.

ANNUAL SHUTDOWN FOR MAINTENANCE FROM 2 OCTOBER TO 4 NOVEMBER 1976

Cycle 6-76 : - commenced 4 November, ended 18 December 1976. No noteworthy incident.

DATA FOR 1976

— number of days originally scheduled 266 reduced to 264

— actual number of days of operation 262.4 — actual operating time (% of year) 71.8% — actual operating time in relation to time scheduled 39.3% — number of fuel elements used 6 — number of fuel elements sent for reprocessing 0 — total number of unscheduled shut-downs (*) 28

including short shut-downs 26 with poison-out 2

CAUSES OF THE UNSCHEDULED SHUT-DOWNS — intervention (operation) 5 — electronics, control, electrical engineering ' 7 — release of safety rods 6 — E.D.F. power cuts 9 — mechanical reasons 1

(•) This total includes all incidents involving switching off the safety circuit (except during test periods). This definition includes a larger number of cases than that in 1975.

ANALYSIS OF CAUSES OF SHUT DOWNS The statistics are comparable with those for 1975.

99

a) Safety rods During the second half of the year all the safety rods achieved what is consi­dered to be the optimum state. Nevertheless studies are continuing to attempt to find a replacement solution if new disturbances are observed.

b) The particularly stormy summer of 1976 had a considerable influence on the frequency of shut-downs. Nevertheless, significant progress appears to have been made by the end of the year on the points most sensitive to short power cuts (cold source and heavy water pressurisation system).

c) It should be noted that although the total number of shut-downs is compa­rable to that of 1975, the number of shut-downs prolonged due .0 poison-out decreased from 8 in 1975 to 2 in 1976.

OPERATION OF THE SUB-ASSEMBLIES

The cold and hot sources have continued to operate perfectly as in the preceding year.

The heavy water detritiation piant has operated very satisfactorily. The extraction of tritium is now in normal operation. This installation is operated in such a way as to maintain the tritium activity in the heavy water below 3 Ci/I.

Quantity of heavy water from the HFR treated (1976) approx. 57 000 litres Quantity of tritium extracted approx. 76 000curies Quantity of tritium sent to Marcoule approx. 57 000 curies

No serious problems were caused by any sub-assembly in 1976. It should be noted, however, that an increase in activity in certain areas of the heavy water circuit could raise difficult problems if it should become more serious.

On the other hand the question of reprocessing of fuel elements could raise a difficult problem if it is not settled before September 1977. Similar problems would arise as regards evacuation of tritium if our contacts at Marcoule were to stop their activity in this field completely.

MAJOR WORK AND MODIFICATIONS IN 1976

FUEL ELEMENTS

With a view to the possible reprocessing of fuel elements in the USA, a new method of cutting them up has been developed. Studies have also been carried out to investigate the possibility of prolonging the reactor operation cycle by increasing the uranium content of the fuel elements. No decision has been taken on this subject.

HEAVY WATER

A unit permitting purification of the heavy water by distillation (capacity 50 l/h) has been installed. Preparations for commissioning are in progress.

INTERMEDIARY COOLING CIRCUITS

The removal.of the deposit left in the circuits by the river water was a long and painstaking process and as a result the connection of the experiments was delayed. However, this problem has now been practically solved. The system is being conti­nually extended and is operating satisfactorily.

ELECTRICAL CONTROL

The second computer has gradually come into operation during the year 1976. Certain difficulties still exist but are in the course of resolution. The installation of new teletype machines has proved increasingly necessary, in view of the fre­quency of faults on the existing machines. This operation is in progress. The ionization chambers for the control of the reactor have had to be replaced during the year. The difficulties encountered in connection with these operations have led us to envisage a new system of positioning these chambers.

VENTILATION AND EFFLUENTS

As a result of the contamination incidents in the halls during the year the gaseous effluent system has been improved to eliminate certain problems encountered in the connection between leaving the experiments and reaching the general net­work.

SAFETY RODS

The modifications to the five safety rods have enabled us to eliminate completely the problem of unnecessary releases. It is hoped that the holding stability will now be satisfactory as a result of the precise adjustments which have been carried out. A replacement solution is however under study.

REGULATED POWER SUPPLY TO THE COMPUTERS

A 180 KVA generator permitting the elimination of brief cuts in the power supply to the scientific computers has been installed and tested. It is planned to connect this up at the end of 1976.

wm^ 8** ^^Rài

EL ^ -i^À*&àîïteLfr New heavy water distil­lation unit.

102

sample environment section 1 - VACUUM

— Maintenance of the following stock : . 198 primary pumps . 45 secondary pumps . 39 special groups

17 air pumps 2 air Roots Hibon 4 helitests

— 560 interventions, of which 175 were serious repairs — 550 helium tests for users outside the service.

The maintenance work on vacuum pumps is continually increasing, partly because of the aging of the equipment, and primarily because of the increasing radioactive contamination of certain pumps (approx 1/3 of the stock). It will be increasingly difficult to carry out the necessary work with the present staff.

2 - CRYOGENIC FLUIDS

2.1 — Liquid nitrogen

Consumption -.324 000 litres (+30%) at 0.43 F/litre.

22 — Liquid helium

Supplied by CENG Consumption :41 250 litres (+17.5%). Average cost per litre, including losses : 10 F. Gas supplied under self-service system : 3 000 m 3 . Gas losses: 6 000 m 3 (20%).

It should be noted that the gas losses have doubled in relation to the preceding year, due partly to the poor operation of the recovery system and partly to the negligence of the users.

If the level of these losses should increase further, the self-service supply of liquid helium would have to be reconsidered.

In the near future the return of the gas to the CENG will be effected by a 1 750 m high pressure pipe. The ecrnomy in comparison with the transportation of the cylinders should pay for this pipe in two years.

3 - CRYOSTATS

3.1 — Current operation

With the commissioning of 9 new cryostats, the effective stock is now 43 cryostats, of which 10 cover the range 1.5 to 300 K and 17 are permanently allocated to particular instruments.

Because of the very hard conditions of use to which this equipment is subjected (frequent transportation, change of users, ignorance by certain users of the most elementary rules), the rate of repair and obsolescence is increasing rapidly.

The 156 requests for loans |+ 20%) were all satisfied, although with certain dif­ficulties.

The loss of 2 members of the section's staff Iby death and retirement) caused certain difficulties and at least for a time reduced the quality of the service.

32 — Development

The 1.5 to 300 K variable temperature cryostat, with access to the sample from above, lightweight, compact, and with a very long holding time (5 days), which was developed at the end of 1975 has been tested successfully in actua! use. It seems to be particularly adapted to the I LL's own requirements and has advantages which are almost contradictory, such as : high speed of temperature variation permitting measurements at different temperatures to be carried out quickly without unnecessary delay between the points, and sufficient stability for measure­ments of critical phenomena (< 0.01 K). All users who have handled this cryostat have shown an interest in being allocated one.

The body of this cryostat will most probably be taken as the standard for future ILL cryostats. It should, however, not be forgotten that there are on the market closed circuit cooling machines which are very reliable and permit temperatures of 8 to 10 K to be obtained. These machines do not consume any cryogenic liquid and their cost is thus recovered in less than 2 years. In order to limit the increase in expenditure on cryogenic liquids, or even to reduce this expenditure, it is important that the ILL should make available the necessary funds to pur­chase a sufficient quantity of these machines.

3.3 — Very low temperatures (T < 1 K)

All development is at present stopped because of the death of Mr. Prati. It is hoped that his replacement during the first half of 1977 will permit a general purpose instrument to be put in service before the end of the year.

'. - FURNACES Routine operation is now normally provided. Special requirements (very high

stability or temperature) have become apparent and the necessary developments are in progress, generally in very close collaboration with the scientists concerned.

instrument operation section The technicians and engineers of this Service, which now numbers 43, are res­ponsible for the technical support to the operational instruments and have there­fore continued to be under great pressure, particularly due to the shortage of technicians. Because the demand for technical assistance exceeded the supply, some instruments were forced to operate below the maximum potential, being obliged to refuse experiments.

During the year reorganisations were made with the object of concentrating the technical support into larger groups for greater efficiency. Four instrument groups and three 'service groups' (Monochromator, Chemistry and Central groups) were formed, the experimental halls team was added to the Central Group, and the Circuits group of the reactor undertook to carry out, through the Central group, all work concerning cooling water and active effluent lines.

A major contribution was made to the installation of the platform for the ultra-cold neutron facility, D17, D18, IN9 and the modification to the D16 shielding.

As part of the responsibilities of the Central Group, personnel have assisted in the optimisation of D15 and IN11, the continued development of multilayer polarisera, the adaptation of a micro-balance to a cryostat, the development of an ultra­high vacuum system for surface studies, development and testing with the Ins­trument Control and Daft Acquisition Service of a new multidetector, and the safety study for the irradiation of a sample of P u 2 4 2 ? . The study has been com­pleted for a laboratory suitable for the handling of some particularly hazardous materials,.eg transuranic elements, and the project is now under discussion.

The standardisation of the operation of the beam shutters in the Neutron Guide Hall was completed, and also a memory system to indicate the actual state and the immediate previous state of each secondary beam shutter. Thus, in the event of closure of the main shutter, experiments may now be restarted by shift staff with a minimum of delay.

During the "n^ual shut-down of the reactor, the opportunity was taken to paint all of the >oc: area and exposed concrete surfaces in the Neutron Guide Hall to reduce the dust problem. Also the floor surface of the experimental zones of IN10, D7, D1B and the Canal Technique were modified as the previous plastic surface was unable to withstand the thermal shock from the accidental spilling of liquid nitrogen.

computing services

introduction During 1976 there were no major organisational or technical developments, and the year has been chiefly characterised by problems connected with .manpower shortages and budget restrictions.

The instruments are now being used more intensively than in the initial years of operation and some of the hardware is beginning to show signs of age. In con­sequence, the maintenance and replacement of existing systems has become the predominant activity.

The DEC System 10 Centra! Computer continues to provide general facilities for scientific computing, including data analysis and archiving, but it has not been possible to augment the configuration in proportion to the demand, and this has led to considerable difficulties.

Nevertheless, ad members of the Department have appreciated the Institut's problems and have cooperated well in keeping all systems functioning.

1 instrument control and data acquisition service

The Service is responsible for developments, improvements and maintenance of ILL electronic equipment, instrument control electronics, instrument com­puter systems and detectors.

1.1 - CARINE Systems [ CARINE1 : D1A, D1B, D2, D5, D8, D9 CARINE2 :D10, IN1JN2, IN3, IN8 CARINE 3 : Stand-by, test and develop­

ment, individual use by DIBor D8]

Technical improvements to a number of diffractometers have highlighted the fact thut computer response delays now constitute the most serious bottleneck for many experiments. To insulate the triple-axis machines from these problems, they

have been grouped together on CARINE 2, and the standby system, CAR INE 3, is allocated to either D1B or D8 (the instruments which usually make the most stringent demands) when it is not otherwise needed.

The possible use of microprocessors to speedup the electronics is under exami­nation. However maintenance of the existing electronics is fully occupying the existing staff and the implementation of major changes will not be easy.

Work has continued on unifying the applications software but again has been delayed by more urgent maintenance problems.

1.2 - NICOLE Systems [ NICOLE 1 :D7, D11A.IN4, IN5.PN1 NICOLE 2 : Stand-by, test and development!

In view of the decision to replace NICOLE by something more modern and flex­ible, development work is now restricted to supporting instrument modifications, in particular the neutron polariser and spin flippers on D7.

The protected power supply, installed at the end of the year, should improve reliability considerably. Because of the frequency of electrical storms during the summer, power interruption was the principal cause of system failure during 1976.

1.3 - PDP-11 Systems [ D3, D6, D8, D11A/B, D14, D17, IN10, IN11, PN2, PN3, LI7, S4]

PN2 (BILL) has acquired a small PDP 11/10, enabling it to be independent of PN3, and now runs well. The three GAMS spectrometers which constitue PN3 continued to have mutual interference problems however, and a small PDP 11/04 had to be installed in order that GAMS II and III could be separated from GAMS I. This now works well.

The termination of the Arndt camera project, D14, has released a small PDP 11/40. This is being upgraded and assigned to D8, this being the instrument that would gain most in improved response time by being removed from CARINE.

The very powerful PDP11/40 based system for D17 became operational in Sep­tember. It contains several novel features, including good on-line data inspection facilities and direct data transmission to the Central Computer and it will take a little time for the most efficient use of these facilities to become understood. The equivalent system for D11A/B became ready for live testing at the end of the year.

Of the established systems, considerable effort has been put into D3and IN10 in connection with instrument modifications. For IN10 and GAMS I there has been

developed a module which generates audio signals as a function of the operational state of the system and which has been linked to the local telephone extension. This enables the scientist to check on the running state of his instrument at any time simply by making a telephone call to the Institut.

1.4 — Other instrument systems

To provide a certain level of automatic data acquisition for IN9 during its feasibi­lity tests a system based on an INTEL 8080 microprocessor has been installed. This is the first time that a microprocessor has been so used at ILL and its perfor­mance is being watched with interest.

The system controlling D15 and D16 continues to cause problems, particularly the interface between the electronics and the PDP 8/E computer. For the new inter­ferometer D18A, there are as yet no resources available for a control computer, but the electronics is well advanced.

1.5 — General electronics

This group provides a service of loans and repairs of electronic control and measur­ing devices for the whole Institut. The demand for such facilities continues to rise,

and it is becoming difficult to ensure a continuously available supply. Essential maintenance of such equipment is now so time-consuming that it is leaving little time for the implementation of new modules.

1.6 — Detectors

New banks of detectors with their associated electronics have been installed on IN7, D11B, IN9. The two-dimensional area detector has been installed on D17 and the associated high speed logic has also been implemented on D11 A.

A specification has been agreed for a portable one-dimensional (banana-type) multidetector, which will be usable on such instruments as D8, D9, D16, and implementation has commenced.

Work has also proceeded on the production of detectors for monitoring purposes.

The Arndt camera project, D14, has now been terminated.

1.7 — Computer maintenance

In view of the rising costs of external maintenance support, ILL has entered into a new contract with the Digital Equipment Corporation (DECI, whereby

108

all computers serviced by them 'r'DP-IO, four PDP 11/20s, two PDP 8s) are hand­led by the resident technicians with a priority determined by ILL. Hence when simultaneous faults occur there may be a lengthy delay before some of them can be repaired. Consideration is being given to the proposal that maintenance of PDP 11/20s should be undertaken by ILL technicians (as are the nine other PDP 11s) since this maintenance team is now well trained on DEC equipment and operating very efficiently.

The number of faults being reported outsit ' normal working hours appears to be decreasing. Regular users are becoming more familiar with system idiosyncrasies and can often either resolve minor problems themselves or know how to prevent them occurring.

2 central computer service The amount of experimental data being transferred to the DEC System 10 Central Computer has for the moment levelled off at about 200M words/year. This reflects the absence of new instruments being commissioned.

Demand for Computing Time continues to rise however as scientists are learning to use more sophisticated correction and analysis programs. The central processor recorded 3200 hours activity in 1976, an increase of 25% over the 1975 usage. This does not reflect the real demand however since the system is saturated for almost the whole time it is under operator control. To alleviate this problem scientists are permitted to operate the machine themselves oversight ano v week­ends but this is not regarded as a satisfactory solution.

In this situation the operational staff have to be very firm in denying access to unauthorised users. However with many experiments now being performed by joint teams consisting of both ILL and visiting scientists it is hard to establish and enforce realistic rules on this matter.

It is also unfortunate that budgetary restrictions have prevented any significant enhancement of the configuration in 1976 or any improvement or extension to the. Computer Room. There is now serious concern about whether the system can cope with future commitments, such as the direct links to D11 and D17 and the additional data that will be generated by the more extensive use of multidetectors.

The additions to the system hardware have been : — 1 disk drive (total now 7) — 1 'Versatec' electrostatic plotter (running off-line! — 1 Tektronix 4010 graphics terminal {total now 2),

The system team divides its time between essential system developments and assistance to users. In the former area may be mentioned : — incorporation of new software supplied by DEC — software for cassette terminal — software for electrostatic printer — changes in experiment data file structures necessitated by the online transfer

of data f rom D11 and D17.

In respect of assistance to users, the most satisfactory aspect is that problems connected with writing data tapes for visitors to take home appear to have been almost resoived. It is now very rare to receive reports of visitors having difficulty in reading or understanding their data. There have also been improvements in the fields of numerical analysis, notably with better random number generator and facilities for handling numbers to any desired precision.

During the year the task of transferring a suite of management services programs relating to travel and training from an external bureau machine to the System 10 was undertaken on behalf of the Social Relations and Guest Scientists Service. These are now running and their day-today use has been handed over to members of that Service.

PDP 10 terminal room.

administration

The administration department comprises the Personnel, Social Relations and Finance sections. Agreement was reached towards the end of 1976 between the Management and the unions on a draft "Convention d'Entreprise" (Internal Agreement), which takes account of the particular situation of the ILL. This draft now has to be approved by the Steering Committee.

personnel A continual increase in the amount and complexity of staff administration work resulted in an internal reorganisation of the Personnel Section, to increase its efficiency and to avoid as far as possible excessive administrative procedures.

The recruitment effort in the United Kingdom has been continued in order to achieve a better balance between the nationalities. Mention should also be made of the work in connection with internal transfers in order to cope better with the existing workload.

I STAFF SITUATION

Categories

(1) w

Posi

tion

on

31.1

2.75

Changes in 1976

Diff

eren

ce

S

+ or

-

Position on

• 31.12.76

(6)

Changes * column 4 compared •with column %

(7)

Categories

(1) w

Posi

tion

on

31.1

2.75

Recruit­ment and internal changes

(3)

Depart­ures and internal changes

(41

Diff

eren

ce

S

+ or

-

Position on

• 31.12.76

(6)

Changes * column 4 compared •with column %

(7) 1. Scientists 73 16 16 - 73 22 9 Technical

and admi­nistrative 'Cidres'

54 4 — + 4 58 —

3. Thesis Students

29 11 15 - 4 25 52

4. Technicians 139 9 6 + 3 142 4

5. Others 100 6 7 - 1 99 7

Total : 395 46 44 + 2 397 11 As in previous years the major staff movements are essentially due to the limited term contracts of the scientific staff. * The percentage of ILL staff who left in 1976 in comparison with effective strength on 31.12.1975.

Il • BREAKDOWN OF STAFF BY NATIONALITY : 1973, 1974 , 1975,1976

Categories French German British Others Total

Categories 73 74 75 76 73 74 75 76 73 74 75 76 73 74 75 76 73 74 75 76

Scientists 19 18 17 17 25 26 22 21 7 13 22 22 17 11 12 13 68 68 73 73

'Cadres' and Engineers 38 35 '38 40 15 9 11 11 5 5 5 7 _ _ _ _ 58 49 54 58

Thesis Students 18 15 15 9 10 7 5 9 1 2 7 7 2 2 2 _ 31 26 29 25

Non-Cadres 182 195 196 193 19 18 15 19 9 14 21 25 4 3 4 4 214 230 239 241

Total 257 263 266 269 69 60 56 60 22 34 65 61 23 16 IS 17 37. 373 395 397

Changes +8 +3 - 7 - 9 - 4 +4 +12 +21 +6 - 7 +2 - 1 + 2 +22 + 2

(1) French : slight decrease in 1976 ( -71 (2) German and British : increase in 1976 (+4and +6}

III DISTRIBUTION OF STAFF BY NATIONALITY IV INCREASE IN STAFF BY CATEGORIES

no. oi ' slalf

British isince 1973' German

1969 1970 1971 1972 1973 1974 1975 1976 y T O r

112

V STAFF BY CATEGORY AND NATIONALITY AT31/12/76

Total staff 397 French 259 German 60 British 61 Others 17

F French G German

• B British 0 Other

120

100

80

6 0

4 0

20

0

SCIENTISTS ENGINEERS and THESIS TECHNICIANS OTHER CADRES (admin) STUDENTS CATEGORIES

TOTAL-73 TOTAL-58 TOTAU25 TOTAL: W2 TDTAU99 F G B 0 F G B F G B F G B 0 F G B 0

32

• 'À'

ft f

78 ft f

s« m *

' 59 1 '0

W. n S-29 317. ' £ • ' • • H l mJS°'' 36 36 oooi

"*s 117. •~£

Siu,

Clear imbalance between French and German and British in the categories en­gineers, technicians and others.

After the dissolution of the ILL union (SILLG) in 1976, two French unions are now represented. At the 2nd round of the elections for "Délégués du Personnel", "Cadres" college, 2 candidates were elected who were not on the union lists (1 full member and 1 substitute).

The "Comité d'Entreprise" (Works Committee), in conformity with its legal functions, participated in the active life of the ILL, particularly through its various subcommittees (training, improvement of working conditions. Société Mutualiste, etc). It also frequently gave its opinion on financial and technical questions.

social relations and guest scientists (figures up to 30.11.1976)

GUEST SCIENTISTS

During 1976 we recorded 1344 visits by guest scientists. In addition there were 28 long-term guest scientists.

Expenditure 1976 = 2,050,000 F This figure includes travel and subsistence expenses for reactor users, guest scien­tists invited for long term experiments, seminars and Scientific Council meetings.

MEDICAL SERV.'CE

a) The medical supervision of staff and guest scientists varies with the risks to which they are subjected. Among staff working in the restricted area more than 200 hotis per year there were : - 1 8 0 ILL staff — 33 guest scientists.

These persons have medical examinations, tests and dialyses twice per year at the Medical Service of the Centre d'Etudes Nucléaires de Grenoble.

The following persons were seen once per year by the Works Doctor on the ILL premises : ILL staff : working less than 200 hours per year in the

restricted area : 124 not working in the restricted area : 95

guest scientists : working less than 200 hours in the restricted area: 116.

Guest scientists who submit on arrival a medical certificate indicating that they are fit to work under ionizing radiation are not required to attend these medical examinations.

b) 20 industrial accidents have so far been declared to the Social Security, including : — 6 accidents involving a total of 99 days absence from work — 3 accidents on the journey to or from work.

c) Absences from work for illness, maternity, etc Up to 30 November 1976, there were : 98 absences from work (13 "Cadres", 85 "non-Cadres"(, representing 1666

days of absence, or a percentage absence of 1.75% in relation to the theo­retical possible number of working hours.

The highest figures for absences from work were in April-May and in Sep­tember. It should be noted that this year there were 4 serious long-term illnesses, recognised as such by the Social Security, involving the application of Article 29.1 of the Staff Conditions and Regulations (maintenance of salary payments for the whole duration of the illness, deduction being made for the daily payments by the Social Security).

d) Social Security and "Société Mutualiste" Up to 30 November 1976 : 6 170 medical forms were checked, completed and forwarded to the Social Security for payment (compared with 5 580 in 1975and4 967 in 1974).

The "Société Mutualiste" which is an internal insurance scheme under French law then provided additional refunds in 4,715 cases, a total of 210,343 F up to 30.11.76. Agreements have been made with the hospitals and clinics in the area, under which employees who are members of the ILL "Société Mutualiste" have no costs to meet (apart from personal expenditure) during a stay in hospital, whether this is for themselves, their wife or husband or a child, if they submit an attestation from the "Société Mutualiste" : 197 such attestations were provided in 1976.

It should be noted that additional reimbursements are paid by IRRAPRI (Superannuation fund for 'Cadres'), particularly as regards reimbursements for X-rays, and periods in hospital for medical reasons. A total of 218 cases were submitted, involving reimbursements amounting to 39,095 F.

SCHOOLING The average number of non-French children attending the "Ecole de ta Houille Blanche" was 42 for the school year 7975/76. This will be 50 for 1976/77. We have contacts with the Max-Planck-Gesellschaft, Hewlett-Packard, Ugine-Carbone and Thomson, who send the children of their non-French staff, on payment of a financial contribution.

Experimental 6ème and 5èmeclasses operate at the "Lycéedes Eaux Claires", on the same principles as at the "Ecole de la Houille Blanche" (one hour instruction per day in the mother tongue tor the non-French children ; all the rest of the timetable being the same as the normal French education). It has not yet been decided whether the head of the lycée will agree to con-

tinue tha experiment beyond the 5ème class, partly because of the small number of pupils concerned (8 to 10 in each class) and also of the choices of studies made at the end of the 5eme.

HOUSING Assistance under French law in the purchase of houses or flats was obtained : through the Comité interprofessionel du logement, which acts as regional collector of the 1% of salaries paid in the preceding year which French em­ployers are required to contribute ; 22 loans totalling 253,000 F ; from IRRAPRI (superannuation fund for 'Cadres') : — 3 direct loans amounting to 81,000 F — 3 guarantees given for loans obtained from the Banque Nationale de Paris — 2 cases refused.

TRAINING In 1976 there was close collaboration between the training section and the sub­committee on training of the "Comité d'Entreprise" (Works Committee).

The common aim has been :

a) to provide a more structured system of courses in the field of languages ; in particular an agreement was reached with the Centre Universitaire d'Edu­cation et Formation des Adultes (University Adult Education Centre), on whose premises English courses are now held ; the ILL staff make usa of the extensive audio-visual facilities of this centre, with teachers qualified for adult education.

b) to find competent organisations in the Grenoble area capable of meeting the numerous requests for professional training.

c) to widen the field of general education, by finding subjects of real interest : in this connection courses are being or will be held for example on economics, consumer education, French institutions, etc.

The courses are divided as follows :

approx. 30% for language courses, — almost 50% for professional training, — slightly less than 20% for general courses.

finance 1 - BUDGET AND ACCOUNTS-

The budget approved for 1976 provided for a total expenditure of 89.5 million Francs. Of this 1.4 million Francs were to be covered by the ILL'S own income, while the contributions of the Associates were set at 88.1 million F.

For the total expenditure estimated in the budget it was necessary — as in the previous year - to work on the basis of the transitional arrangements, under

which the three governments authorised the Associates to approve a budget higher than that authorised by the financial provisions of the Intergovernmental Agree­ment of 19 July 1974, pending a revision of the legal instruments.

The formal revision of these financial provisions has now taken place. The amended text of the Intergovernmental Agreement, eliminating the "ceiling" for the annual budget, was signed on 27 July 1976. The corresponding amendment to the Contract of the Association was implemented on 23 August 1976.

The following is the actual expenditure according to the provisional accounts for 1976, in comparison with the total estimated expenditure of 89.5 million Francs :

a) Operation

1976 (x 1000)

Consumable materials and small equipment 6,270

Fuel elements 9,900

Staff costs 41,856

Taxes 97

Long-term service contracts 7,400 Other work, supplies and services from third parties 5,623

Transport, removal and travel expenses 950

Miscellaneous administrative costs 2,800

Total Operation 74,896

% 1975 % of total (xlOOO) of total

7.0 5,940 7.8

11.0 9,800 12.8

46.55 36,100 47.1

0.1

8.2 8,570 112

6 3 5380 7.0

1.0 800 1.0

3.1 2350 3.1

8325 68,940 90.0

b) Investments

Buildings 230 025 400 0.5

Equipment (except experimental equipment) 1,100 1.20 1,000 1.3

Experimental equipment B.857 9.9 4,100 5.3

Other investments 4.810 5.4 2,200 2.9 Total investments 14,997 16.75 7,700 ICO

Total expenditure 89,893 100.00 76,640 100.0

c) Income

ILL'S own income 1,794 2.0 1,700 22

Grants from Associates 88,099 98.0 74,940 97.B

Total income 89,893 100.0 76,640 100.0

The provisional total of expenditure for 1976 was thus only slightly less than estimated in the budget. The ILL'S own income was less satisfactory than origi­nally assumed. Some contracts anticipated for the detrîtiation of heavy water were not placed with the ILL.

1.1 lr. comparison with the previous year the operation expenditure increased from 68.9 million F to 74.9 million F (+ 8.7%). This rate of increase is likely to be only slightly above the general inflation rate for the year 1976. The most important variation in comparison with the original estimates was under the item "Travel and accomodation costs for reactor users", where the expenditure was about 40% higher than originally estimated. This ad­ditional expenditure was mainly due to an expansion of user operation.

1.2 The investment expenditure increased in comparison with the previous year from 8.7 million F to 16.75 million F (+92%). It should hewever be pointed out that this figure includes 3.1 million F for the purchase of the central computer system, and which is therefore to be regarded as a single non­recurring item of Expenditure.

The bookkeeping system was further improved, in order to inform those responsible for authorising expenditure at an earlier stage on the state of expenditure and of commitments received.

3 - PURCHASING

In 1976 5,538 purchase orders - in comparison with 3,930 in 1975 - were hand­led by the Purchasing Section. There is close cooperation with the technical and scientific areas on all purchases.

Further success was achieved in U'76 in our efforts to achieve a better equili­brium in the placing of orders amonj the partner countries. The proportion of orders placed in the United Kingdom and Germany changed as follows :

1976 1975

F % F % Volume of orders 26,231,243 100.0 20,086,199 100.0

Distribution

— France 16,493,089 62.9 12,951,198 64.4

— Germany B,594,704 25.1 6,206,736 30,9

- U . K . 3,143,450 12.0 938,265 4.7

VI EXPENDITURE TRENDS 1973-77

FF x 1,000,000

n 50

40

30

20

10

Personnel costs

1973 to 1976 show actual expenditure 1977 is a budget figure

Operating costs

1973 1974 1975 1976 1977

119

We record with sadness the death of two members of the Institut staff in a flying accident in May 1976 :

Mr. Jean-Paul Giraud Mr. Gabriel Prati

A son of Mr. Giraud was also killed in the same accident. Mr. Giraud and Mr. Prati had worked at the ILL for a number of years and were highfy regarded by all.

120

I.L.L. PUBLICATIONS 1976

[References arranged by Code Number)

Example of Code Number : 76 A OS

76 stands for the year the paper was published

A stands for the first letter of the first author's name

08 is the serial number of registration.

The letters T or S behind a code number indicate that this report is an INTERNAL TECHNICAL or SCIENTIFIC report respectively.

121

f—t ~1

75A46 P. ALDEBERT, J.M. BADIE. J P. TRAVERSE, J.L. BUEVOZ, T.G. ROULT, Rev. Int. d u Hemes Temp. M Refract. 1975, J 2 , 307 (1975) Application d'un dispo­sitif de diffraction des naîtrons * haute température a l'4tude d'oxydes rôfractaires.

75A92 M. ASGHAR, J.P. BOCQUET, H. SCHRADER. G. SIEGEAT, Proceedings 6f (ht 3rd National Soviet Conf. on Neutron Physics. Kiev 9*13 June 1975, vol. 6. p. 17 t . The Mass Separator Lohengiln and somt Expérimentai Work.

76A216 H. ACKERMANN. 0 . OUBBERS, H. GRUPP, M. GRUPP, P. HEITJANS, W. HELL, H.J. STOCK MANN, Proceedings of the Int. Conf. on Hyporfine Interactions studied in Nuclear Heactions and Decay, Uppsala, Sweden, June 10-14 (1974) p. SO- Self-Diffusion in 7Li-Metal and the Spin-Lattice Relaxation of the ^Emitter 8 L i .

75A299 G. ALLEN, R. GHOSH, iS. HIGG1NS, J p . COTTON, B. FARNOUX. G. JANNINK, G. WEILL. Chem. Phys. Letters 38^ S57 (1976). Observation of the Neutron Qua» Elastic Broadening by Polymers in Solution.

75A316 M . AHTEE, A.W. HEWAT, J . Phys. C. (Solid State Phys). The Structures of Noo .80 .0 .2Ù N b 0 3 (phase K) and N a U l 6 5 K 0 . 3 5 W b 0 . 3 'phase L) at Room Temperature by Neutron Powder Diffraction.

75B05 P. BASTIE, J. BORNAREL, J- LAJZEROWICZ, H . V A L L A D E . J.R. SCHNEIDER, Phys. Re«. 512,5112 (19751. y-Ray Diffractomotry : A new Technique of Measuring the Spontaneous sheer deformation in Ferroebstics ; Ap­plication to KH2PÛ4- Comparison with recent measurements of the birefringence.

75B43 R. BESERMAN. M. Z IGONE, W. DREXEL, C. MARTI , Solid State Commun. ^8_,419 ( Î 976 ) . Density of States Determination of Mixed Semiconductors by Neutron Dif­fraction.

76B90T i \ BLANCHARD, Rapport Technique. Expérience IN10.

75B146 P J . BROWN, Abstracts of Papers presented at tho Int. Crystallography Conference held in Melbourne, Australia, 19-23 August 1974. The value of Magnetization Density Determinations in the Study of "Bonding" in Crystals.

76B155 G . B A S l A R O , P. NOZIERES. Phys. Bev.B13,2560 (19761. Resorvnt Acceptor Leveis in Zero Gap Semiconductors under Uniaxial Stress.

76BI95 HX>. BARTUNIK, V. JACOBE, Proceedings of the Inter. Congress of Neutron Scattering, Penan 5-6 Aug. 1975, p. 430. A Multidetector Consisting of One-Oimensional Position Sensitive Gas Dotectors for Protein Crystallography Including Anomalous Dispersion.

75B198 P. BASTIE, J . BDRNAREL, J . LAJZEROWICZ, J.R. SCHNEIDER: Third European Meeting on FerroeTcctricity EMF-3, Zurich, Suisse 22-26 Sept. 1975. Ferroelecirici 1_4, 587 (lf>761. T-Ray Diffraciometry far the Study of Ferroelastic Crystals : Application 10 KH2PO4.

75B229 D. BLOCH. J . PAUREAU, J . VOIRON, G. PARISOT, Rev. Sci. Irtttrum. 47, 296 11976). Neutron Scattering et High Pressure.

766257 J . BEILLE, P. PATAUD, P. RADHAKRISHNA, Solid State Comm. 16, 1291 (19761. Spin-Wave Stiffness Coefficients In AlloysôT Nickel In Palladium and Platinum.

76B318 A. B1CKERMANN, H. SPIT2ER, M. STEIN-ARSIC, H. STILLER. RJ=. LECHNER, H. MEYER. R. SCHÉRM, F. VOLINO, Proceedings of the int. Conf, on Low Temp. Physics, OtaniamI, Finland, 14-20 Aug. 1975. Neuiron Scattering on Mixed Phonon-Libron Modes- in Solid H j .

75C56 A.K. CHEETHAM, B.E.F. FENDER, H. FUESS, A.F . WRIGHT, Acta Crystallogr. B 32 94 (1976). A Powder Neutron Diffraction Study of Lanthanum and Icerkim Trtfluoride*.

76C140 P. CHI EUX, J . Phys. Chem. 79 , p. 2891 11975). Concen­tration Fluctuations in the NorvMetal to Metal Transition Rang* of the LI-ND3 System : A Neutron Sra l l Angle Scattering Experiment.

75C152 G.M. CLAUDET, A. TIPPE, W.B. YELON, J. Pnys. E . ^ , 269 (19761. A Cryostat for Four-Circle Neutron Diffraction.

75C172 P. COPPENS, M S . LEHMANN, Acta Crystallogr. B32. 1777 11976). Charge Density Studies below Liquid Nitrogen Temperature ( I t ) : Neutron Analysis of P-Nitropyridine-N-Oxide at 30 It and Comparison with X-Ray Result*.

75C253T B. CHAR DON NET, J. JACOPE, Proceedings of the 2nd Ispf» Nudear Symposium, Stresa May 20 25 1975, p. 135. Fast two-Dimensional Read out for Proponiona1 Multi-detector.

75C2S6 P. CH1EUX, M J . S1ENKO, F. DE3AECKER. J. Phys. Chem . 2 5 ; 2996 (1975). A Neutron Diffraction Study and Phase Diagram Investlgatior of the Solid Lithium-Ammonia Compound.

75C283 A . COLOMB. M . GONDRAND, M.S. LEHMANN, J J . CAPPONI, J.C. JOUBERT, J . Solid State Chem. 16, 41 11976). Etude par Diffraction X et Neutronique d'un Mono­crine! de UCrjOg obtenu par Synthèse Hyirotherrrute sous 1res Haute Pmsron. Déterminai ton des Structures Cristallographiques « magnétiques.

75C285 R. COMES. R. CURRAT, F. DENOYER, M . LAMBERT, AM. QUITTET. Ferroefecuïcs, 12, 11976). Structurai A c pacts of Phese Transitions.

75C309 D. CASTAGNE, 0 . CHASSEAU, J . GAULTIER. C. HALrW, P. PUPUIS, J . NEEL, A . F ILHOL, 4eme Conf. sur l'Etat Solid* Organique, Juii.vi 1975 (Bordeaux). Mol . Cry st. and Liq. Cryst. 32 , 187 (197G). Propriétés Structurales et Electriques da Complexes de l'Ion Radiez! TCNQ. In­fluença delà Température, r

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D 7SD36S E D . DUEE, H. FUESS. S.A. MASON, Scientific Report. Preliminary Investigations on Protein Crystal*. Pan I : Study on Orlhofhombic Lysosyme p*. Part I I : Study on Insulin and Gadolinium Insulin.

75D64 M.C. DESJONQUERES, F. CYROT-LACKMANN. J . of Chem. Phys. 64, 3707 (1976). On tht Aspherfcitv of Elec-if on Clouds near Transition Matal Surfaces.

75D104 8 . DORMER, W. won der OSTEN, W. fiUHRER, J . Phyi. C . j ^ p . 72311976). Lattice Dynamics of AflBr.

75D117 B. DOR NE R, Proceedings of the XII in Européen Congress on Molecular Spectroscopy, Strasbourg, July 1-4, (1975) p. 215. Inelastic Neutron Scat tiring : A Tool to Study Atomic Motions and their Correlation near Phase Trans­formations.

75D129 B. D O R N E R . . M . STEINER, J . Phys. C 9, p. 15 (19761. Quasi-one Dimensional Features in the Phonon Dispersion of CsNiT 3 .

75D136 M.C. DESJONQUERES, F. CYROT-LACKMANN, J . Phyi. F, 6 , 667 (1976). On the Surracs States of Mo and W.

75D142 A . DRAPERI. D. HERRMANN-RONZAUD. J . PAUHEAU, J . Phys. 6 (Scientific Instr.) 9, 174 11976). Neutron Scat­tering of Single Crystals under High Uniaxial Stress.

75D197 B. DORNER, R.E. GHOSH, G. HARBEKE, Phys. Status Solid) lb) 73, 659 (1976). Phonon Dispersion in iheLayered Compound Pbl 2-

75D2G1 DESCLAUX J.P. (Séminaire donné à l'Ecole de l 'O .TA.N . Photoioniza-ion and other probes of many-electron inter­actions. Cery-le-Rouet, France, 31 Août • 13 Septembre 1975). Plenum Publishing ( I chapter). Relativisitic Effects in Atomic Structure Calculations : An Introduction.

75D284 F. DENOYER, M. LAMBERT, R. COMES, R. CUR RAT. Solid State Commun. .18, 441 (1976). Inelastic Neutron Scattering Study in Cubic NaNbQg.

E 76E220 G. ECKOLD, K. FUNKE. j . KALUS. fi.E. LECHNER, J . Phyi. and Chem. Solids. _37, 1097 11976). The Diffusa Motion of Silver Ions in û-Aj| ; Rasulis from Quesielastfc Neutron Scattering.

75E282 J.V. ESSAM, K.M. GWILYM, J.M. LOVE LUCK. J . Phys. C.J3, 365 (1976). Thermodynamic Scaling Laws fora Dilute Ferromagnet in the Percolation Limit by Series Methods.

F 75F124 H. FUESS. G. BASSI, M. BONNET, A . DELAPALME, Solid State Commun, 18, 657 (1976). Neutron Scattering Length of Terbium. Structure Refinement and Magnetic Moments of Terbium Iron Garnet.

75F159 A J . FREEMAN, J.P. OESCLAUX, G-H. LANDER, J . FABER Jr. Phys. Rev. Bt j j , 1168 (1976). Neutron Ma­gnetic Form Factors of Uranium Ions.

F 76F177 H. FUESS, H.D. BARTUNIK, Acta Crystallogr. B32. 2803 (1976). Neutron Diffraction Structure Determination of Blt-(L-Hrstidinalo) cadmium Dili yd rate.

7SF226 H.C. FOGEDBY. j . Phys. C. 9. p. 3757 (1976). Correlation Functions for the Tomonager Modal.

7F3F246 W J . F ITZGERALD, C.N.W. DARLINGTON, Act» Crystal­logr. A32, 671 (1976). A Numerical of ihe Dynamical Theory of Scattering f r o m * Distorted Crystal.

76G281 F. GAUTIER, G. MORAITIS, J.C. PA RLE BAS, J . Phys. F. (Metal Phys-)_6j 381 (1976). Energy of Formation lor Oilute Alloys with Transitional Impurities.

75G306 P.H. GAMLEN, J.W. WHITE, J, Chem. Soc. (Faraday Trans­ections I I I , 72, 446 (1976). Structure and Dynamics of macrocrystalline Graphite, Graphon. by Neutron Scattering.

7BH47 H. HERVET, S. LAGOMARSINO. F. HUSTICHELLI , F. VOLINO, Acta Crystallogr. A32, 166 (1976). Neutron Diffraction from a Smectic A Monodomain.

76H95 H. H INKELMANN, H.G. RE IK. Solid State Commun., 16, 567 (1975). Frequency Dependence of the Real Part Of the Electrical Conductivity for TTF-TCNQ.

75H112 D. HOHLWËIN. W. JOSWIG. J. Appi. Crysiadogr. ^ 130 (19761. Neutron Weissenbero Photographs of Satellite Reflections in Plagioclase Feldspars.

75H134 B. HAMELIN , Nucl. Instrum. and Methods 135. 299 i976) . Techniques Nouvelle» pour la Polarisation d'un Faisceau da Neutrons par Miroirs Magnétiques.

75H21B H. H INKELMANN, Solid State Commun., IjJ, 957 (1976). Frequency Depondence of Electron Lifetime in One-Di­mensional Metals.

75H227 H. H E R V 6 T . A J . OIANOUX. fl.E. LECHNER. F. VOLINO, J . Phys,^7, 687 (1976). Neutron Scattering Study of Methyl Group Rotation in Solid Para-Azoxyanisole (PAA).

75H230 M. HETZELT. A. HE1DEMANN. Nucl. Initrum. and Methods, 133, 51 (1976). A Small-Angle Scattering Spec­trometer for Polarized Neutrons.

75H245 H. HERVET, S. LAG DMA RSI NO, F. RUSTICHELLI, F. VOLINO, Solid State Commun.. 1 7 , 1533 (19751. Direct Measurement of Til l Angle in Smectic Mesophates by Neutron Diffraction.

75H271 A. HE IDEMANN, J.C. LASSEGUES. R.E. LECHNER, M. SCHLAAK, Proceedings of the 1 Tih European Con­grats on Molecular Spectroscopy, Strasbourg, France. July t-4, 1975, p. 327. Molecular Reorientation in Crystalline ( C H 3 ) 3 N H C I .

H 75H304 Anne-Marie HECHT. J.W. WHITE. J . Chtm. Soc. (Faraday Transaction II) 72. 439 (1976). Inelastic Neutron Scattering by Water in iïï~Oro>red Tobacco Moule V i n » Solution.

75H323 M.T. HUTCHtNGS, R. SCHËRM, S.RJ>. SMITH, Magnetism and Magnetic Materials, Philadelphia Proceeding*. 372 11975). Neutron Scattering Investigation of the Central Mode and Acoustic Php non Anomaly arising from the Jahn-T«tier Phase Transition h TbVÛ4.

I 751241 Y . ISHIKAWA, K. TAJ IMA, P. RADHAKRISHNA, J . Phys. Soc. Jap. ,40 1597 (1976). Spin Polarization in a Ferro­magnetic Heusler Alloy Pd2MnSn.

761259 G. ICHE. P. NOZlEflES, J. Phys. 37, 1313 (1976). A Simple Stochastic Description of De$orptJ5n~Rates.

76J40 A. JO ST, B. REES, B. YELON, Acta Crystallogr.B3l, 2649 (19751. Electronic Structure of Chromium Hexecarbonyl at 78K. I. Neutron Diffraction Study.

75J72T J. JACOBE. Rapport Technique. Détecteurs at Mult kit-tec ten rs j j a i pour neutrons thermiques.

75J128 B. JACROT, P- PFEIFFER, J . WITZ. Philos. Trans. 6 , 2 7 6 , 109 (1976) Paper presented at a meeting far discussion on "The Assembly of Regular Viruses" at the R. Soc. London, 18-19 June 1975. The Structure of a spherical plant virus (bromegrass mosaic virus) establish7d by neutron diffraction.

K

75K191 Yonfl-Ki K IM. J.P. DESCLAUX, Phy*. Rev. Lett._36. 139 (1976). Relativist» f values for the Resonance Transitions of Li and Be-Like Ions-

I 75L11 F. L IVET, P. RADHAKRISHNA, Solid State Commun., 18, 331 (1976). Distribution of magnetic moment in an alloy of nickel and 2% titanium.

75L160 G.H. LANDER. J . FAB EH Jr, A J . FREEMAN, JJ>. DESCLAUX, Phys. Rev. 613. 1177 (1976). Neutron-Dif­fraction Study of U0.2-1- Paramagnetic State.

75L315 V. LU2ZATI , A. TARD1EU, L. MATEU, C. SARDET, H.6. STUHRMANN, L. AGGER8ECK, A . M . SCANU. Proceedings of the Brookhaven Symposia on Neutrons in Biology, June 1975. N ° 27, IV-61-77 (1976). X-Ray and Neutron Small Angle Scattering Studies of Human Serum Lipoproteins.

75L321 P. L IAUD, R J . STEINBERG, B. V IGNON. A Two-Coil Spin Ftipper for Beams of Polarized Slow Neutrons. Nucl. Instrum.and Methods. 125, 7 (1975).

M 7BM62 C. MARTI , P. THOREL, Comptes Rendus du Colloque international sur les Surfaces. Brest, 27*30 Mai 1975 (Proceedings p. 140). Structures Crlsiallograpriiquet d'Ad-Kjrbats et Diffraction de Neutron*.

75M75 S. MAZKEDJAN, F. RU5TÏCHELLI , Solid State Commun., 18, 331 (1975). A Computer Experiment on th» Deviaiion from the Bragg Law and the Widths of Diffraction Pattern* In Perfect Crystals.

75M108 J.V. MALLOW, A J . FREEMAN, J J*. DESCLAUX, J . Phys. B13. 18B4 (1976). Relativistic Elctron i>nsiticsand Isomer Shifts In Transition Metal Ions.

75M205 H. MEISTEfl . C.U.E. ZEYEN. N u d . Instrum. and Methods 131 , 441 (1976t. A Cryostat and Température Regulation System for very Slow Continuous Cooling and Heating Experiments.

75M209 A P . M U R A N I , G. GOELTZ, K. I BEL. Solid State Commun., 19, 733 (1976). Evidence for Freezing of Spins in Binary Alloy*.

75M251 J . MEYER, G. DOLLING, R. SCHERM. H.R. GLYDE. J . Phys. F. (Metal Phys.) 6 , 943 (1976). Anhermonic Inter­ference Effects in 943 Potassium.

75M27Ê A. MILLER, B. BflODSKY DOYLE, DJS. HULMES, G.T. JENKINS. J.W. WHITE, J. HAAS, K. IBEL, P. T IMMINS, Proceedings of the Brookhaven Symposia on Neutrons in Biology, June 1975 : no 27, 111-86 - I I I-100 (1976). Neutron Scattering by Collagen.

75M291 G. MARGUERIE. H£. STUHRMANN, i. Mol . Biol., 102, 143 (1976). A neutron Small-Angle Scattering Study of Bovine Fibrinogen.

75N13B P. NOZIERES, J . de Physique. J 7 , CI-271 (1976). Appli­cation de l'Idée de renormalisation en physique du solide.

75N145 Ch. de NOVION. B.E.F. FENDER, W. JUST, Procaedingt of the 5lh Int. Conf. on Plutonium and Other Act Inides. Beden-Badtn, Sept. 10-13, 1975. Eds. H. Blank and R. Lindner, p. 893 (19761- Study of Atomic Short-Rango order in Non-Stofchio metric Act hi i de Csrbklcs by Diffuse Neutron Scattering.

75P188 A. PIERREFEU. B. DORNEn, E.F. STEIGMEIER, Pro­ceedings of the European Meeting on Ferra electricity EMF-3, Zurich, 22-26 Sept. 1975. Ferroclectrics 12.^ 126 (1976). Inelastic Neutron Scattering in SbSI near the ferroelectric Phase Transformation.

p 75P237 P. PFEIFFER. J.P. BOCÛUET. A. PlNSTON, R. ROUSSILLE, M. ASGHAH. G. BAILLEUL. R. DECKER, J . GREIF, H. SCHRADER, G. SJEGERT, H . WOLLNIK, J . B LAC HOT. E. MONNANO. F. SCHUSSLER. j . Phyi. (in print). Gamma Spectroscopy of some Short-Lived Ftt-m n Produe» with i h t Isotopa Separator LOHENGRIN.

75P248 T. PETERLIN-N6UMAIER, T. SPRINGER, J , Polym. Se). 14. 1351 (1976). Investigation 0 f Relaxation Processes tn Linear Polyethylene in the 10-9 tec Region by Means of High Resolution NeutronSpoctroKopy.

75R185 C. RIEKEL, J. Solid State Cham. 17, 389 (1976). Siructur» Refinement of TiRe2 by Neutron Diffraction.

75R193 C. RIEKEL. R. SCHOLLHORN. Meter. Res. Bull. 1 1 , 369 11976)- A Neutron Diffraction Study on the MercSTatlon of Ammoni» into Tantalum DUulfid*.

75R204 R. ROUSS1LLE, J.A. PlNSTON. F. BRAUMANOL, P. JEUCH, J. LARYSZ, W. MAMPE, K. SCHRECKENBACH, Nuct, Pnvs. A258, 257 (19761. Level Structure of 1 < 7 N d . ( l l l l .Tha 1 4 6 N d (n, el Reaction.

76R211 F, RUSTICHELLI, Proceedings of the L IX Congres» Na-xionaJe dMa Socwta ftaliana ai Fisice. Finnic, 30 Oct. 3 New. 1975. Rivista del Nuowo Cimento, 6 . 141 (1976). Recenti Risultati NeHe Fisica Oegli Siati Xggregatl Pre» II Reattore Ad Alto Flusto di Grenoble.

75R235 P. HADHAKRI5HNA, P. PATAUD, W. JUST. R, TOURNIER. Solid State Commun-.JS, 1213 (19761. Dif­fuse Scattering of Polarized Neutrons from a Cu5QNt{jrj Alloy.

75R261 M. ROUSSEAU, J. NOUET, R. ALMAIRAC, B. HENNION, J . Phys. (Lettres), 37, L-33 (1976). Soft Phonon and Central Peak In RbCaF 3 .

75R298 D. RICHTER. J. TOPLER, B. ALEFELO, A. HEIDEMANN, Int. J . of Magnetism.^. 109 (1976). Investigation of the Hyptrffne Splitting of Protons In T b H l a by Means of Incoherent Spin &;•• Scattering ol Neutrons.

75R320 F. RUSTICHELLI, J. Phys. G. (Nucl. PhysJ _!_, 724 (1975). Range of 233( j Fission Fragments in Natural Elements.

75S76 Julius SCHNEIDER, W. JUST, J. Appl. Crystallogr.j). 128 (I975),E(ast>c DiKuse Neutron Scattering an In lee.

75S20B W.G. STIRLING, B. DORNER. J.O.N. CKEEKE, J . REVELLI . Solid State Comm. J8 . 931 (19761. Acoustic Phonons in the Transition-Men I Dichalcogentde Layer Compound TiSe;.

7SS219S G. SIEGERT. J. GREIF, H. WOLLNIK, R. DECKER, G. FIEDLER, VU. KAISER, B. PFEIFFER, Scientific Report. Nuclear Charge Distributions in the light Group of Fission Products from 2 3 5 U l n t | ) ( [ ) .

75S238 C. ST ASSIS, G.R. KLINE, A J . FREEMAN, J.P. DESCLAUX Phyi. Rev. B, J3_, 3916 (1976). Polarized Neutron Study of the Coherent Paramagnetic Scattering Amplitude of Metallic Erbium.

76S2S2 J.R. SCHNEIDER, J. Appl. CrystaHogr. j ^ 394 11976). Absolute Structure Factor Measurements in Imperfect Single Cry*ta*s by Means olY-Ray Dll'ractomotry.

G. SADLER, T.A. KHAN, K. SISTEMICH, J.W. GHÙTER. H. LAWIN, W.D. LAUPPE, H.A. SELIC, M. SHAANAN. F. SCHUSSLER, J . BLACHOT, E. MONNAND. G. BAILLEUL, JJ». BOCOUET, P. PFEIFFER, H. SCHRA0EH B. FOGELBERG:Nuel . Phys. A252, 365 119/5). Studies of the 0-Decay ol ^ Y and the level Scheme ol &>Zt.

76S322 R. SCHERM, W.G. STIRLING. F. VOLINO, R > . COWLEY, P. H ILTON, A.D.B. WOODS, Proceedings of Deutsche Physikeftagung.Mûrtchen Sept. 1975,921 (19751.

76S313 H.B. STUHRMANN, J. HAAS. K. I 9EL , M . H J . KOCH, R.R. CRICHTON, J . Mol. Biol. tOO, 399 (1976). Low Angle Neutron Scattering of Ferritin studied by Contra» Variation.

7ST1B9 L. TUR0AM, P. NOZI6RÊS. M. GERL, J. Physique 37. 169 (1976). Driving Force for die E tact romigrai ion of an Impurity In an Homogeneous Metal.

75V101 F. VOLINO. A J . DIANOUX, H. HERV6T. Solid State Commun., 18. 453 (1976). Smecttc H. Smcctic VI Pre-transitional~€ffect by Orientat'onal Ordering in TBBA.

75V265 P.H.M. V A N ASSCHE, H. BORNER, W.F. DAVIDSON, H.R. KOCH, Atomic Masses and Fundamental Constants,

j j j 37 (1976). Primary Standards for Gamma Energy Deter­minations.

w 7SW68 V . WAGNER, W.DREXEL, Proceedings of the 1975 Arbeils-gemeiruchaft Magnetismus Conference 17-22 Mar:.-h 1975, Mûrrster, Germany. J. of Magnetism and Magnetic Materials 2t, 106 (1976). Inelastic it-scattering of Antiferromagnetic CoO.

7BW196 P. WOLFERS, G. F ILL ION, M. BACMANN. H. NOEL. Journal de Physique, _37 1 233 (1976). Structure et Pro* prlétès Magnétiques du Q-US3.

75W223 V. WAGNER, D. TOCCHETTI, B. HENNiON. Conference on Magnetism and Magnetic Materials, Philadelphia 1975. AIP Conference Proceedings 29, p. 255 (19761. Magnetic Excitations in Amiferrgmagnetic N i i . x C o x 0 .

75W244 C. WAGEMANS, P. D'HONDT, A J . DERUYTTER, A. EMSALLEM, M. ASGlIAR, Nucl. Phys. A259. 423 (19761. The Thermal Neutron Induced Fission Cross-Section of 2 3 2 r h .

75W279 D.L. WORCESTER. J.M. G ILL lS . E J . O'BRIEN, K. IBEL, Proceedings ol the Brookhaven Symposia on Neutrons in Biology. June 1975 : no 27, 111-101-114 (1976). Neutron Diffraction Studies of Vertebrate Striated Muscle.

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w 75W3Q3 J.W. WHITE, A. MILLER, K. IBEL, J. Chim. Soc. Faraday Tram. I I , 12. 435 (1976). Neutron Diffraction Studies on Collagen.

75Z161 C.M.E. ZEYEN, H. MEISTER, W. KLEY, Solid Stat* Com­mun., 18 621 (19761. Phase Mixing in the Critical Region of the Ferroelectric Phase Transition in KO2PO4-

A 76A08 M. ASGHAR, A. EMSALLEM, R .CHERY.C.WAGEMANS, P. D'HONDT, A J . DERUYTTER, Nucl. Phys. A259, 429 (1976). The Z ^ U l n , ft 1 23»tri Reaction with Thermal Neutront.

76AÎ1 G. ALBERTINI , A. BOEUF, G. CESINI, S. M A 2 K E D I A N , S. ME LONE, F. RUSTICHELLI, Acta Crystallogr. 33 863 (1976). A Simple Model for Dynamical Neutron Diffraction by Oeformad Crystals.

.76A18 G. AIMDERSSON, M. ASGHAR, A. EMSALLEM, E. HAGBERG, B. JONSON, Phys. Lett. 61B, 234 (1976). Observation of Proton Emission Following Thermal Neutron Captura in 3 4 . 5 d ^ R b (Feb. 1976).

76A61 P. ARMBRUSTER, M. ASGHAR, JP. BOCQUET, R. DECKER, H. EWALO, J . GRÊIF. E. MOLL, B. PFEIFFER. H. SCHRADER, F. SCHUSSLER, G.SIEGERT, H. WOLLNIK, Int. conf. on Electromagnetic Isotope se­parators and related ion accelerators. Kiryat Anavlm, Israel, May 10-13 11976). Nucl. Instrum. & Methods, 130, 213 (1976). Separator Lohengrin : Performance and Special Features for Experiment*.

76A78 G. ALBERTINI , A. BOEUF, S. MAZKEOIAN, S. ME LONE, V . R 0 2 Z I , F. RUSTICHELLI, J . Appt . Crystallogr. (in print). Comparison of Curved Monochromator Neutron Data with the Prediction of « Simple Model.

76A80 A . AHTEE. M . AHTE6 , A .M. GLA2ËR, A.W. HEWAT, Acta Crystallogr. (in print). The Structure of Orthorhombic SrZr03 by neutron Powder Diffraction.

7SA83 P. ARMBRUSTER, K. SISTEMICH, J.P. BOCQUET, CH. CHAUVIN . Y . GLAIZE. Nucl. Instrum. Methods 132, 129 (1976). Energy Straggling of heavy ions. (A = 100, E/A = IMeV/amu) in Solids and Gases, the limiting Factor of the Charge resolving Power of Energy-lost Detecion.

76A97 D. ALLEN, J-E. EPPERSON. V . GEROLD, G. KOSTORZ, S. MESSOLORAS, R J . STEWART, Proceedings of the Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976.1 , 102 11976). Neutron Smell Angle Scattering Studies on Aluminium Alloys.

76A128 G. ALBERTINI , A. BOEUF, S. LAGOMARSINO, S. MAZKEOIAN, S. MELONE. F. RUSTICHELLI. Acte Crystal loqr. (in print). Evidence for Fenkuctien Effect in Neutron Diffraction by Curved Crystals.

76A294 H. ACKERMANN. D. DUBBEHS, M. GRUPP, P. HEITJANS, H J . STOCKMANN. K.P. WANCZEK, K. RECKER end R. LECKEBUSCH, Z. Naiurlorsch. 3 1 ^ 1298 (1976). Electric Ouadrupolc Interaction or 2 0 F m a KZnF3 Single Crystal.

76A29S P. ARMBRUSTER Proceedings of tha 3rd Int. Conf. on Nuclei far from Stability, May 19-26,1976, Cargeso, (France) (CERN-Rvport 76-13) in print. Separation of Fast Nuclear Réaction Products.

76A361 G. ALBERTIN I , A . BOEUF, S. LAGOMARSINO, S. MAZKEOIAN, S. ME LONE. F. RUSTICHELLI, Pro­ceedings of tht Conf. on Neutron Scattering, Gatlinburg, Term. 6-10 June 1976, I I . 1151. Neutron Properties of Curved Monochromators.

76809 G. BADUREK, W. BAUSPIESS, U. BONSE, H. RAUCH, Phys. Lett. 56A, 244, 11976). Measurements of Neutron Interference and Polarization Effects Caused by Nuclear and Magnetic Interaction.

768I3T A. BEYNET, J . GOWMAN, H. SCHRAOER, Technical Report. The Change of Sources and Diaphragms o f the Mass Separator "Lohengrin", PN1.

76624 J . BLETRY, Z, Naturforseh.^la, 960 (1976). Partial Struc­ture Factor In MulticompOnent Liquid or Amorphous Alloys.

76B29 M. BONNET. A. DELAPALME, P. BECKER, H . FUE55, Acta Cryst. A32, 945 (1976). Polarized Neutron Diffraction. A Too) for Testing Extinction Models. Application to Yttrium Iron Garnet.

76B43T Ph. BLANCHARD, Technical Report. Basic ILL.

76B53 G. 8AOUREK, W. BAUSPIESS, U. BONSE, H. RAUCH, A . ZEILiNGER. Phys. Rev. D14, 1177 (1976). Phase Shift and Spin Rotation Phenomena in Neutron Interferomoiry.

76B67T A . BARTHELEMY, Technical Report.Système d'acquisition et de traitement pour Multidetecteur.

76B84 W. BAUSPIESS, U. BONSE, W. GRAEFF. J . Appi. Crystal­logr. J9J 68 11976). Spherical-Wave Theory of tha Zero-Absorption ILL X-Ray or Neutron Interferometer.

76B101 G. BULOT, A . SEELIG, J . SEELIG, G. ZACCAI. Proceedings of tha Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976, 1 . 109- Neutron Scattering from Speci­fically Deutoreted Lipid Membranes.

76B105 P J . BROWN. K . f lA . ZIEBECK, Proceedings of the Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976, 2, 616. Magnetization Distribution m a Partially Disordered A~ii4V Alloy.

B 768108 W. BAUSPIESS, U. BONSE, H. RAUCH, Proceedings o( the Conf. on Neutron Scattering, Gattinburg, Tenn. 6-10 June 1976, _2. 1094. The Perfect Crystal Neutron Inter­ferometer. A Tool lor Novel end Praci» Measurement.

76B116 P J . BROWN, A. CAPIOMONT, P. CHENAVAS, P. RA0HAKR15HNA, J . SCHWEIZER, Proceedings of the Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976. _2. 650 Polarized Neutron Study DT the Nitroxide Radical in the Di-(2,2.6.&Tetramethyl-4-PiperIdlnyl-l-Oxyl) Suberate.

768117 B. BARBARA. J.X. BOUCHERLE, M.F. ROSSIGNOL, j . SCHWEIZER, Proceeding! of the Conf. on Neutron Scatter log, Gatlinburg. Tenn. 6-10 June, 1 9 7 6 . ^ 452 . Obser­vation of a Reorientation of the Hafmfum Moments in H0AI2 with Polarized Neutron Diffraction.

76B118 M.O. BARGOUTH, G. WILL. W B . YELON, A . MEYER, J. Phys. C. (Solid StatB Phys.) 9, 1483 (1976I. Neutron Cryital FieldSpectroscopy i n C U D Ï C E T A ^ .

76B127 A . BRANDO D'OLIVEIRA, H . DANIEL, T . V O N EGIOY, F J . HARTMANN. Z . fur Naturforsch. 31a. 1160 11976). A new determination of the n rest mass.

7SB129 L. BOSIO. E. SCHEOLEH, C G . WINDSOR. J. Phys.,_37. 747 (1976). Quasi-Elastic Neutron Scattering from Liquid Gallium over the Température Range 163 to 333 K.

763158 P. 8EAUDRY, H.U. PETERSEN, M. GRUNBERG-MANGO, B. JACROT. Biochem. and Bioph- Research Commun. 72. 391 {1976). A Neutron Study of the 30 S-Ribosoroe Sutounlt and ot the 30 S-l F3 Complex.

768168 B. BARBARA, J.X. BOUCHERLE, JJ>. DESCLAUX, M.F. ROSSIGNOL. J. SCHWEIZER. Proceedings of the 3rd Eu rap- Crystall. Meeting on Crystal Field Effects in Metals and Alloys, Zurich, 1-4 Sept. 1976 (in print). Rare Earth Wave Function Determination by Polarized Neutron Dif­fraction in R E A L j .

76B174 J.X. BOUCHERLE, J- SCHWEIZER, Proceeding J of the Int. Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976 (in print). Form Factor of Neodymkim in N d A I ; .

76B196 J . BEILLE, D. BLOCH, J . VOIRON. G. PARISOT, Pro­ceedings or the Int. Conf. on Magnetism, Amstirdim, 6-10 Sept. 1976 (in print). The Low Temperature Magnetic Behaviour of CeSn3.

76B199 H. BERTAGNOLLI , P. CHIEUX, M.O. ZEIOLER, Mol . Phys. 32j 1731 (1976). A Neutron-Diffraction Study of Liquid Acetronitrile I I . C D 3 C 1 5 N .

76B234T G A . BRlGGS, WJ3. STIRLING. Technical Report. Neutron Diffraction Facilities at Western European Medium Flux Reactors.

76B244 H. BERTAGNOLLI, P. CHIEUX. M.O. ZEIOLER. Moi Phys. 32. 759 11976). A Neutron Diffraction Study af LiQukfXcètory trite l -COgC^N.

76B253T E. BLUM, Rapport Technique. Exemples d'utilisation de RUNOFF.

7BB262 W. BAUSPIESS, U. BONSE. W. GRAEFF, H. RAUCH, J. Appl. Crystallogr. lin print). A Bicrystal Munochromator of Moderate Wavelength Resolution lor Use with X-Rays or Thermal Neutrons,

76B270T A. BARTHELEMY, A. F1LHOL, Technical Report. Dif­fract omet er Extended Carina User's software System. Syitem

7fiB287T A . BARTHELEMY, R. T A F F U T , Technical Report. Module CAMAC, "Chien de Garde".

76B296 U. BONSE. K. RAUCH, Phyiikaltsehe Blatte- H»U 3 /76. Spalte 68?. Interferometer lùr Neutroncn-

76B297 P J . BROWN, JJ3. FORSV TH. J. Phyt. C (in print). A Search for Spin-Orbit Coupling Effects In Magnetic Neutron Scat­tering by FeC03.

76B298 B. BARBARA. J.P. G IRAUD, J. LAFOREST, R. LEMAIRE, E. SIAUO, J . SCHWEIZER, Proceedings of the Int. Conf. on Magnetism, Amsterdam, 6-10 Sept- 1976 (in print). Spontaneous Magneioelastic Distortion in some Rare-Earth-Iron Laves Phases.

76B299 B. BARBARA. J.X. BOUCHERLE. M.F. ROSSIGNOL. J. SCHWEIZER, Proceedings of the Int. Conf. on Macetism. Amsterdam, 6-10 Sept. 1976. (in print). Crystal Fiaid and Exchange in the Cubic H0AI2 Compound.

76B300 G.E. BACON, N. COWLAM, A.G. SELF, Acta Crystallogr. A32, 167 11976). Systematic Variations of Bragg Peak Position in Neutron Diffraction Patterns.

76B301 J.L. BAUDOUR. H. CAILLGAU. W.B. YELON. Acta Crystal­logr. (in print). Structural Phase Transition in Polypherv's IV . Double well Potential in the Disordered Phase of Paia-terphenyl from Neutron (200 K) and X-Ray (Room Tem­perature!. Diffraction Data-

76B302 J.L. BAUDOUR. H. CAILLEAU. Y. D6LUGEARD. J . DESUCHE. A. G IRARD, J . MEINNEL, Mol. Cryst. Liq. Crytt. 32 , 5, (1976). Transition Structurale dans le Para-terphenyle.

768303 F. BRAUMANDL, W.F , DAVIDSON. A.F . DIGGORY, P. JEUCH, J . LARYSZ, JA. PINSTON, R. R0U*SfLLE, K. SCHRECKENBACH, D.D. WARNER, H. BORNER, DO H U U PHUOC, A . I . NAMENSON, Verhandlungen der DeutKhen Physikaiisclien GeseHschaft, 913 (19761. (n. 7)-und (n, e)- Spektrotkopie mit den GAMS bezw. BILL Spek-trometern am Hoctiflunreaktor des I .LJ_ in Grenoble (France).

B 76B304 0 . BLASCHKO, G. ERNST, J.R. SCHNEIDER, J . Phys. G. (in pr in t ) . Investigation of the Mosaic Structure Rbl -Single Crystals in the MatastaW» Pressure Region with 412k»V-7-Rays.

7CB305 N. BURGER, H. FUESSand INSTITUT LAUE-LANGEVIN, Zt l ischr i f t fur Kristallographie. (in pr in t ) . Dig Kristall-t t r uk tu rvon Zinkformiat-Dihydrat.

76B306 R. BLOCK, J.B. SUCK, W.F. F R 6 Y L A N D , F. HENSEL, W. G LASER, Barkh i der Bunsengesellschaft. 80, 718 (1976). Measurement of the Structure Factor of expanded Liquid Rubidium by Neutron Diffract ion up l o 1400 K and 200 Bar.

76B307 R. BLOCK, JJ3. SUCK, W.F. F R E Y L A N D , F. HENSEL, W. GLÀSER, Proceedings of the 3rd In t . Conf. on Liquid Matais, Bristol, July 12-16. 1976 (in pr in t ) . Structure Factor of expanded Liquid Rubidium up t o 1400 K and 200 Bar.

76C26 J.R.D. COPLEY, A . R A H M A N , Phys. Rev. A , 13, 2276

- (1976). Density Fluctuations in Molten Salts.II.Molecular DynamicsStudy of L iquid RbBr.

76Û40 C. CAREL, L. HUBERT, G. GOBERT, P. T A R D I F . L. CHANCEL. A p p l . Opt . 16 (1977). Neutron Diffract ion on a Vertical Axis Goniometer. High Temperature Dif­fraction Furnace for all Atmosphères. Translation of 75C234T.

76C&0 H . C A I l LEAU.J .L . B A U D O U R . W . B . Y E L O N , A . G IRARD, Y . DELUGEARD, J . DESUCHE, J . Physique .2L. C1-233 (19761. Transition Structurale dans le Paratorphcnyie.

76CS8 N . C O W L A M , GJ=. BACON, D.H. K l f lKWOOD.Scr . Metall., 9, 1303 (19751. The Measurement of Pressure in Graphite Modules during the Graphitisation of Ferritic Steels.

76C163 J.R.D. COPLEY. S.W. LOVESEY, Proceedings of 3rd Int . Conf. on Liquid Metals. Bristol 12-16, 1976 (in pr int) . Individual and Collective Atomic Mot ion in Non-Molecular L iquid*.

76C169 A . CASTETS, D. TOCCHETTI. B. HENNION. Proceedings of In t . Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976 (in pr in t ) . Spin Wave Spectrum of Iron-Rhodium A l loy in Ant(ferromagnetic Phases.

70C179 C J . C A f l L I L E , P.D. HEY, 0 . MACK, J . Phys. E (Scientific Instruments) (in pr in t ) . High Efficiency Soller Slit Col­l imators for Thermal Neutrons.

76C181 M.M.R. COSTA, P J . BROWN, J . Phyt . F. ( in pr in t ) . Charge •nd Spin Density in Chromium-Aluminium Solid Solutions.

76 CI 82 D. CALECKI . C. LEWI NE R, P. NOZIERES, J . Phys. (in pr in t ) . Quantum Energy Distr ibution Function of Hot Electron* in Crossed Electric and Magnetic Fields.

76C192T R. CHEVALIER, Technical Report. Banc de Test pour Mark V I .

76C205 R.G. CLERC, W. L A N G , H. W O H L F A R T H , K .H. SCHMIDT, H. SCHRADER, Proceeding* of the 3rd In t . Conf. on Nudei far f rom Stabil i ty, 19-26 May 11976) Cergase (France). (Cern 76-13), 509 (Genève 1976). Nuclear Charge and Mass Yields for 2 3 5 U ( n , h , t ) .

76C206 B.G. CARPENTER, J.P. B A L D W I N , E.M. BRADBURY, K. IBEL. Nucleic Acids R e s e a r c h , ^ 1739 (1976). Orga­nisation of Subunlts in Chromatin.

76C210 D. CHASSEAU, D. CASTAGNE, J . GAULT IER , C. HAUW, P. DUPU15, J. NEEL, A . F t L H O L , Mo). C r y * , end L i q . Cryst. 32, 187 (1976). Propriétés Structurales et Electriques de Compteites da l ' Ion Radical TCNO. Influence de la Tem­pérature.

76C218 M. C A T T l , G . FERRARIS, A . F ILHOL, Acta Crystal log r. (in pr in t ) . Hydrogen Bonding in the Crystalline State. CaHP04 (Moneii te), PI or P1 ? A Novel Neutron Diffract ion Study.

76C25S P. CARRARA, J.P. REDOULES. C. ESCRIBE, K.R.A. 2 IEBECK, Solid State Commun., (in p r im) . The dispersion of Acoustic Phonorr» in C0CI2.

76C308 D. CALECKI , C. LEWINER, P. NOZIERES, Proceedings of the X I I I In t . Conf. of the Physics of Semiconductors (Roma July 1976) (in pr in t ) . Electron Temperature in a Hot Electron Problem.

76C309 H. C A I L L E A U , J.L. BAUDOUR, A . G IRARD, W.B. Y E L O N , Solid State Commun., 20, 577 (1976). Long Range Order et d ie Phase Transition in Para ter phenyt.

76C310 A . N . CHRISTENSEN. P. HANSEN, MS. L E H M A N N , J . Solid Stale Chem. 19^ 299 (1P7R* Isotope Effects in tha Bonds of JÎCrOOH and fJ-CrOOO.

76C311 A . N . CHRISTENSEN. P. HANSEN, MS. L E H M A N N , J . Solid State Chem. ( in p r i n t l . Isotope Effects in the Bonds of or-CrOOH and a-CrOOD.

76C312 M. C A T T l , G. GERVASIO, S.A. MASON, Proceedings of the 3rd Europ. Cry stall. Meeting, on Crystal Field Effects in Metals and Al loys. Zur ich. 1-4 Sept. 11976) 166. Neutron Diffract ion Study of a Hydride Acoiylenic Ruthenium Cluster Compound, HRu3(COg) ( C 2 8 u

t ) -

76C313 M. COOPER, P. PATTISON, J.R. SCHNEIDER, Philos. M * 9 - : H J 243 (19761. Compton Profile Measurements with 421 koVir-Radlat ion.

76C314 D.K. CHRISTEN, F. TASSET, S. SPOONER, H.A. MOOK, PhvF. Rev. | in pr in t ) . Small-Angle Neutron Sea nor in a of Niob ium Wi the Intermediate State.

128

76C316 J.P. COTTON, M . N I E R L I C H . F. BOUE. M. DAOUD, B. FARNOUX. 6 . J A N N I N K , R. OUPPLESSIX, C. PICOT, J . Chem. Phys. J35. 1101 11976). Experimental Determi­nation of the Tempsrature Concentration Diagram of Flexible Polymer Solutions by Neutron Scatter inn.

D. 76D48 J.Y. DERRIEN. J . DUPUY, Phys.Chem. L i q . . J t 7 1 . 1 1 9 7 6 ) . Structure of Molten Silver CNoride.

76075 J . DEPORTES, D. G IVORD. J . SCHWEIZER, F.TASSET, I.E.E.E. Trans, on Magnetism, Vo l . MAG-12 .p . 1000 (1976). Different Contributions of the Two Cobalt Sites to the Magnetocrystalline Anisotropy of YC05 and Related Com­pounds.

76D94 A J . D IANOUX, A . HEIDEMANN. F. VOL INO, H. HERVET Mot. Phys. .32^ 1521, 0 9 7 6 ) . Se If-Diffusion and Undulation Modes in a Smectfc A Liquid Crystal : A High-Resolut ion Neutron-scattering Study.

76D102 J.R. D A V I S , T.J, HICKS. Proceedings of the Conf. on Neutron Scattering, Gatlinburg, T t n n . 6-10 June 1976, 7^ G84. Magnetic Defect Scattering f rom 7-Mn Cu and 7-Mn Pd.

WJÛ. D.tESS, P.O. M ILLER, JJVI. PENOLEBURY,- p, PERRIN, N.F. RAMSEY, Phys. Rev. (in pr in t ) . Search for an Electric Dipofe Moment of the Neutron.

76D1B7T A . DIGGORY, Technical Report. The Gamma Spectro­meters at I .L.L.

760207 G. DOLL ING, Methods in Computational Physics, 15. 1 (1976). The Calculation of Phonon Frequencies.

76D228 J . D A U B E R T . K . K N O R R . W . D U L T Z . H . J E X , R .CURRAT J . Phys. C. (Solid State P h y s J . j ^ L389 (1976). Lattice Dynamics of K C N .

760281 W. DREXEL. A. M U R A N I , 0 . TOCCHETTI , W. K L E Y , i . SOSNOWSKA, O.K. ROSS, J . Phy i . and Cham, of Solids 37 , 1135 (1976). The Motions of Hydrogen Impurities in Q-Palladium-Hydr ide.

760392 B. CORNER, Ft. COMES, Chapter of a book edited by T . Springer and W S . Lovesey : "Dynamics of Solids and Crystals by Neutron Scattering" Springer Veriag.Phonons and Structural Phase Transformations. Simple Example of Experimental Phenomena.

76D393 6 . DORMER, Proceedings of the fn t . Conf. on Neutron Scattering, Gatlinburg, T t n n . 6*10 June 1976, 1 , 194. Low-Oimensional Features in Phonon Dispersion Surraces (Abstract).

76D394 B. OORNER, Proceedings of (he Colloque In t . du C.N.R.S. sur les Transitions Metal-Nan-Metal, Au trans, (F ranee I June 28. - July 1 . (1976). Journal de Physique l in pr in t ) . Inelastic Neutron Scattering f rom the Isomorphous Layered Compounds PI1I2. T1S82, and TaS2.

D 76D395 JJ>. OESCLAUX, 1NAT0-ASI Series I Series B, 367 (1976). Ed . F J . Wullteumier (Plenum Press, N.Y.). Photoioni jat ion and other Probes of Many-Electron Interactions.

76D3S6 0 . DUBBERS: 2 . Phys. A276. 245 (1976). Nudear Re­orientation (n Static and Radio-Frequency Electro-Ma­gnetic Fields.

760397 D. DUBBl-RS. H. ACKER M A N N , M. GRUPP. P. HElTJANS, H J . STOOKMANN. Z . Pnys. B25. 363 (1976). Sign of Nuclear Electric Quadrupole Coupling Constants in Solids f rom 7-Ftay Anisotropy Measurements after Capture of Polarized Neutrons.

76D398 D. DAOUD, JJ». COTTON. B. FARNOUX. G. JANNINK, G. S A f l M A , H. BENOIT, R. DUPPLESSIX, C. PICOT, P.G. da GENNES, Macromolaculet, 8, 604 (1975). Solutions of Flexible polymers : Neutron Experiments and Inter­pretat ion.

760399 M. D U V A L . R. DUPPLESSIX, C. PICOT. P. DECKER, P. REMPP, H. BENOIT, J.P. COTTON. R. 0 6 E R . G. JANNINK B. FARNOUX, J . Poiym. Sci. Polym. Lett . , 14^ 585 11976). Neutron Small Angle Scattering by Lopolymers Solutions.

760401 J . DEPORTES, O. G IVORD, R. LEMAIRE, Physica B {in pr in t ) . Magnetic Interactions in R M n j 2 Compounds.

76E318 P. ESCUDIER. D. GIGNOUX, D. G IVORD, R. LEMA1RE, AJ>. M U R A N I , Physica B (in pr in t ) . Crystal Field Effects i n E r N i B .

F 76F16 A . F I L H O L , P A . TIMMINS, Acta Crystallogr., JI32 3116 (1976). The Crystal and Molecular Structure of Cyclo-N-Methyl-L-Alanyl Ic-MMe-L-Ala-L-Alal.

76F49 S. FUNAHASHI , F. MOUSSA, M. STEINER, Solid State Commun., ,18^433 (1976). Experimental Détermination of (he Spin-Wave Spectrum of the Two-Dimensional Ferro-magnet K2CUF4.

76F60 H.C. FOGEDBY, J. Phys. C, 9, L313, '19761. Time De­pendent Phase Shift analysis oi~the Symmetric Wolf Model.

76F150 A . FREUNO, Proceedings of (he In t . Conf. on Neutron Scattering, Gail inburg. Tenn. F 10 June 1976, 2. 1143. Progress in Neutron Monochromator Development at the I .L.L.

76F250 H. FUESS, D. HOHLWEIN, SA, MASON. Acta Crystal-logr. ( in p r in t ) . Neutron Dif f ract ion Study of L-Histkfine Hydrochloride Monohydrate.

76F271T A . F I L H O L . M. THOMAS. Technical Report. Manual for soma Routine Programs for X-Ray and Neutron 4 Cirde Oi (frac to meters and for Crystallography.

76F320 B. FOGELBERG, W. MAMPE. Phys. Let t , l in print I. De­termination o l the Neutron Binding Energy of the Delayed Neutron Emitter 13?Xe.

129

G 76G28T M. GREVAZ, Rapport Technique. Automatisation des Expériences 0 1 1 et D17.

76G39T M. GREVAZ, Rapport Technique. Realisation d'un Ter­minal Graphique Inter actif.

76G66T M . GREVAZ, G. PASTOR. J J - TSCHOFEN, Technical Repoi t .On line Debugging Modula OOM 11/TP/.

76G111 R £ . GHOSH, J.S. HIGGINS. Proceedings of the I n i . Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976, 1 . 323. Quasi-Elastic Scattering l i o m Dilute Polymer Solutions,

76G124T R.E. GHOSH, G. GOLTZ, J S . HIGGINS: G. KOSTORZ, Technical Report, June 1976. A Computing Guida for D11A.

76G177 G. GUMPERTSBERGER, P. SCHUCK, Phys. Lett , (in p r in t ! . Semi-Classical Approximat ion to the Single Particle and Spectral Density.

7GGIQ5T M. GREVAZ, Rapport Technique. Util isation da Oinosor.

76G198T H . GRIMM, Rapport Technique. How t o Handle Resolution Problems wi th RESLIB on the OEC10 Computer at the I .L.L.

76G242 F. GAUTIER, J.C. PARLERAS, A . SCHAEFEH, Proceedings of the In t . Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976 (in pr in t ) . Electronic Structure of Interstit ial* in Ferromagnetic Metals.

76G248 W. GROSS, K. KNORH, AS>. M U R A N I . - Ï . H J . BUSCHOW, Proceedings of tho Conf. on Crystal Field Effects in Metals and Al loys, Zurich, Sept. 1976 (in pr in t ) . Crystal Fields in PrXalX = In , T l , Pb, Sn). Intermetallic Compounds wi th Q13AU Structure.

76G321 M. GREVAZ, Proceedings of the Int . Workshop on Real Time Programming, Rocquencourt, Jung 1976 . A Control System wi th 9 Hierarchy of Response T ime.

76G322T G. G 0 8 E R T , M. MOURRAT, Rapport Technique. Appl i ­cation des Labyrinthes d'Etanchéité Différentielle aux choppers sous vide.

76G324 V . GEROLD, J.E. EPPERSON, G. KOSTORZ, J . App l . Crystallogr, (in pr in t ) . On the Determination of the Me-tas tab le Miscibil i ty Gap in Ternary Alloys by Small Angle Scattering. I I . Application to the System Al-Zn-Mg.

76G32S A . G R A N D . J.B. ROBERT, A . F I L H O L , Acta Crystallogr. (in pr in t ) . Crystal and Molecular Structure of 2 thiono-2N (diisopropyl-amino-1,3,2 dithiaphosphoiiane) and of 2-thiono-2-aziridino-1.3.2-dithiaphosphorii]ne.

G 76G326 D. GIGNOUX, 0 . G IVORD, A . del M O R A L , Solid State Commun., ]9. 891 (1976). Magnetic Properties o f G d x Y i . x N l g A l i o y t .

76G327 D. G IVORO, J . LA FOREST, R. LEMAIRE, Phytic* B ( in pr in t ) . Magnetic Transition in TI1C05 due to change Of Co-Momtnt.

76H10 A . HE IDEMANN, K. KOSUGE. S. KACNt , Phys. Status Solidi (a), 35 , 4S I (1976). Investigation o f the Hyperfme Spl i t t ing in V3O5 and V4O7 by Inelastic Neutron Scat­tering.

76H21 H. H I N K E L M A N N , BA. HUBERMANN, Solid Slate Com­mun., 19, 365 (1976). Dressed Ion Diffusion and Shake-off Processes in Superionic Conductors.

76H25S JJ3. HIGGINS, Scientific Report. Chemistry Informat ion Meeting held at the Institut Laue-Langevin, Oct . 10 11 1975.

76H42S D. HOHLWEIN, B. K L A R . Scientific Report. Absorpt ion Correction tor the Modi i ied Laue Method.

76H56 A.W. HEWAT, I . BA ILEY, Nucl . Instrum. end Methods, 463 , (1976). D IA , a High Resolution Neutron Ponder Diffract a meter wi th a Bank of Mylar Coll imators.

76H87 R. HASER, SA. MASON, Acta Crystallogr. A 3 1 , S3, S178 (1975). Proceedings of the 10th lUCr Conf., Amsterdam 7-15 August 11975). A Neutron Diffract ion Single Crystal Analysis of an Acid Containing an Isolated S-Water Molecule Cluster.

76H90 H. H I N K E L M A N N , 2 . Phys. B25, J47_ (1976). Infrared Behaviour of Metallic Systems in one, two and three Di­mensions.

76H107 J.S. HIGGINS, Proceedings of t:>e Int . Conf. on ft eu i ron Scattering, Gatl inburg, Tenn. 6-10 June 1976, 1 , 344. Con­formational Motions of Long Chain Molecules in Rubbers and Networks.

76H109 PJ \ . H I L T O N , W.G. STIRLING, R. SCHERM, Proceedings of the In t . Conf. on Neutron Scattering. Tenn. 6-10 June 1976,2; .1003. Excitation of 3He- 4 He Mixtures.

76H11S J.B. H A Y T E R , Proceedings of the Int . Conf. on Neutron Scattering, Gatl inburg, Tenn. 6-10 June 1976, 2 , 1074. Recent Developments in Polarized Neutrons.

76H122T ÏÏS. HOWELL5, Technical Report. Users Guide to Pro eessingof IN10 Data (Part 2).

H 76H159 A . HEIOEMANN, D. RICHTER. Proceedings of the 3rd Europ. Cryual l . Meeting on Crystal Field Effects in Metals and Al loy». Zurich, 1-4 Sept. 1976 (in print I . Study of a Hyper fine Interactions in Solids by Inelastic Spin-Flip Scattering of Neutrons.

76H164 P. HE IT J ANS. H. ACKERMANN. 0 . DUBBERS. M. GRUPP, H J . STOCKMANN, Proceeding! of 3rd In t . Conf. on Liquid Metals, Bristol, 17-16 July 1976 l in pr in l ) . Spin-Lattice Relaxation of the /^Emitter S L I in Liquid 7 L i .

78H184 T J . HICKS, J . Phy». F. (in pr im) . The Distr ibution of Magnetic Moment in Nickel Al loys

76 H188 A . HE IDE M A N N , K. KC3UGE. Y . UEDA, S. K A C H I , Phys. Status Solidi (in pr in t ) . Hyperfine Interaction in V3O7.

76H190 M. HENNION. B. HENNION, F. KAJZAR. Solid State Commun. ,21., 23) 11977). Single Crystal Neutron Inelastic Scattering 'Measurement of Stiffness Constant in Disordered 1c£.Ni-Mn A l loys.

76H191 T J . HICKS, Phys. Rev. Lett . 39, 719 (1976). Probing Giant Magnetization Clouds wi th Polarized Neutrons.

7BHI95 M.T. HÎJTCHINGS: fl.D. LOWDS. G. PARISOT, M.G. TOWNSeND, Proceedings of the In t . Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976. Physica (in p r i n t l . Neutron Inelastic Scattering Measurement o f Spin Waves in I ron Sulphide.

76H200 E. HAGBERG, G. ANDERSSON, M. ASGHAR, A . EMSALLEM, B. JONSON, Proc. of the 3rd International Conference on Nuclei far f rom Stabil i ty, Ctirgese (Francel. (CERN Yellow Report 76-13 11976) 3 9 4 1 ) . Thermal Neutron Capture Experiments w i th Radioactive Targets.

76H213 J S . H I G G I N S , R.E.GHOSH, W.S.HOWÊLLS, G . A L L E N , J . Chem. Soc. Faraday I I . 23» 4 0 (1977). (^-Dépendent Broadening in Quasielastic Incoherent Neutron Scattering f rom a Polymer Melt.

76H226 P A . H I L T O N , R. SCHERM, W.G. ST IRL ING. J . Low Temp. Phys. (in pr in t ) . Expsrimentol Studies of the exci­ta t ion Spectrum of 3 H e - 4 H e Mixtures using Neutron Inelastic Scattering.

76H231 D. HOLHWEIN. J . o f A p p l . Crystaltogr. ( in pr in t ) . Photo­graphic Neutron Dif f ract ion Study of L-Histidine H C I , H2O by the modif ied Laue Methods.

76H247 H. HAPPEL, P.V. BLANCKENHAGEN, K. KNORR, A . M U R A N I , Proceedings of the Conf. on Crystal Field Effects in Metal* and Al loys, Zurich, Sept. 1976 (in pr in t ) . Crystal Electric Fields In Rare-Earth A l j Compounds.

76H264 H . H I N K E L M A N N , Solid Stale Commun., l i n p r in t ) . Cor­relation Effects in Superionic Conductors : Model Calcu­lations for the Thermoelectric Power.

76H328 J S . HIGGINS. X . GERBAUX, C. BARTHET, A . H A O N I . J . Phys. ( in pr in t ) . Etude Comparative des Vibrations de Basses Frequences de la /Jhydroquinrme par Infra-rouge t t par Dif fusion Inelattique des Neutrons.

76H329 J.B. H A Y T E R , J. PENFOLD, W.G. WILL IAMS, Nature. 262. 569 (1976). Observation of the Interference of

Neutrons reflected f rom Thin Film».

76H330 J.B. HAYTER. Analusis, ± 231 (1976). The Appl icat ion of Neutron Scattering to the Study of Organic Structures : A n Int roduct ion.

76H331 R.P. HJELM, G.G. K N E A L E , P. SUAU, J.P. BALDWIN, E.M, BRADBURY, K. I8EL , Cell l in p r i n t l . Small Angle Neutron Scattering Studies of Chromatin Subunits in So­lut ion.

76H332 R P . HJELM, 4P. BALDWIN, E M , BRAOBURY: Methods li» Celt Biology. Chromosomal Protein Research. Academic Press l in p r in t ) . Uti l ization o f Neutron Scattering for Ana­lysis of Chromatin and Nucleoprotein Structure.

76H333 D. HERMANN-nONZAUD. AS. PAVLOVIC, A . W A I N T A L . Proceedings of tha Int . Conf. on Magnetism. Amsterdam, 6-10 Sept., 1976. PhysiC3 B (in pr in t ) . Critical and Elastic Behaviour of Paramagnetic Manganese ox ide.

76H334 8 . HENNION, M.T. HUTCH1NGS, R.D. LOWDE, M.W. STRINGFELLOW, D. TOCCHETTI , Proceedings o f the Conf. on Neutron Scattering, Gatl inburg, Tenn-, 6-10 June 1976. H, 825. The Generalized Susceptibility of Mn73Ni27-

76H409 K. HENNING, L.P. KAUN, B. L1PPOLD, S. MATTH1ES, W. M A T Z , W. DREXEL, P. SEYFERT, N. I . MOREVA, Solid State Commun., 21_, 297 (1977). Crystal Field Split­t ing of P r 3 + in P r A i j Investigated by Inelastic Neutron Scattering.

I 76162 INSTITUT LAUE-LANGEVIN, Annua' Report 1975.

76163 INSTITUT LAUE-LANGEVIN, Annex to the Annual Report 1975.

76192 Y . ISHIKAWA, K. TAJ IMA, D. BLOCH, M. ROTH, Solid State Commun.. 19, 525 (19761. Helical Spin Structure In Manganese Silicide MnSi.

76.164 B. JACROT, Rept. Prog. Phys. JÎ9. 911 (1976). The Study of Biological Structures by Neutron Scattering f rom So­lut ions.

76J89 A J . JACOBSON, 8.E.F. FENDER, J . Phys. C, 8^844 (1975) A Neutron Diffraction Study of *ie Nuclear and Magnetic Structure of B1F0O3.

76J133 P. JEUCH, W. MAMPE, Nuel. Instrum. 81 Methods, 140, 347 (1976). Principles for an optimal Demagnetization and Application to the High-Résolut ion beta Spectromtrter " B I L L " .

J 76J148 J.F. J A L . r. CH1EUX, J . DUPUY, Bar. Buns tngcvPhy i . Cham.Ed. 80, Nr. 8, 820 (1976). Concentration Fluctuat ion! in Solutions of Potassium in Potasrium Bromide.

76J237S G. JEN K I N , P. SEYFERT, 0 . F E L T I N . J .L . RAGAZZONt , P. ROUBEAU, P. BANKS, S. COX, N. HARRIS . Scientific Hopon. Report on Progrès» on the Cryogenic Neul ton Polarizing Filter tor IN9.

76J33& '.V. JOSWIG, M. KOREKAWA, S. WILSON, N . Jahrb. Minor. M h . (in pr in t ) . Neutron end X-Ray Dif f ract ion Study on the Superstructure of • Sodium-Rich Low Plagktdase A n i g j ,

76J355 V . JACCARINO, F. MEZEI . J . 5CHWEIZER, Solid State Commun. 20 (19761. Polarized Neutron Study of the Weak Itinerant Fetromagnet (Fe CoJSi.

76J402 P. JEUCH. K. SCHRECKEN6ACH, T. von EGIDY, J . LARYSZ, W. MAMPE, Proceedings of the In t . Conf. on iho Interaction of Neutron» wi th Nuclei. July 6-9, 1976. Lowel l , Mass. ( in pr in t ) . Determination of Vibrational States in ^^STh by Inn , , e~l Measurements.

76J410 J . JACOBE, Proceedings of the Conf. on Neutron Scattering, Getl inburg, Tenn. 6-10 June 1976, I I . 1159. Survey of Defection Systems on Electronics for I L L Experiments

76K12 G . KOSTORZ, Atomkemenergie. 28, 61 (1976). Neutron Scattering and Materials Research at the Institut Max von LfluB - Paul Langevin.

76K59 G. KOSTORZ, Z. Meiai lk. 67, 704 (1976). Neutron Small Angle Scattering of Irradiated Aluminium-Sil icon Al loys.

76K119 W. KUHTZ . R. GELLER, H. DACHS, P. CONVERT, Solid State Commun. 18. 1479 (19761. Magnetic Short Range Order in CsMnFeFg.

76K121S B. K L A B , Scientific Report. Description of thB DTCC Program. (Dynamical Theory of Ideally Curved Crystals).

76K131T W. KAISER, Technical Report. Study of the On-Line Lost Times for Diflractometers on the Carine System.

76K132T R. KLESSE, G. ANDERLOHR, Technical Report. Plasma-Display sis Life-Display fur schnelle Datenacauisition und sis graphischsr Display fur ein Terminal.

76K166 F. KAJZAR, F. SACCHETTI. Sol id. State Commun., 2 t , 235 (1977). Temperature Dependence o f the Asphericity of Magnetic Distribution in Transit ion Metal Al loys.

76K1BO W. K N O L L , Proceedings o f the 3rd In t . Conf. on Liquid Metals, Bristol. 12-16 July 1976 (in pr in t ) . The Structure Factor for Liquid Zinc at Different Temperatures.

76K27? G. KOSTOR2, Scr. Metall. (In pr in t ) . Some Remarks Con­cerning Dislocation Moi ion in Superconductors.

76K224 K.L. K R A T Z , W. RUDOLPH. H. OHM. H. FRANZ , G. H E R R M A N N , C. RISTORt, CRANCON. M. ASGHAR, G . I . CRAWFORD. F.M. N U h , S.G. PRUSSIN, Phys. Let­ters (in pr in t ) . Decay of Individual Levels in Delayed Neutron Emitters to excited Slates in the Final Nuclei .

76K232T

W. KAISER, Technical Report. Three-Axis Spectrometer Program : l o r Control and Data Acquisi t ion of the Carina System.

76K241

J . KOT2LER, W. SCHEITHE. K. KNORR. W. Y E L O N , J . Phys. CS, 1291 (1976). Neutron Dif f ract ion Study on Magnetic Propeata:. of Anhydrous Gadolinium Trichlor ide.

7BK336 R. KLESSE.- A . A X M A M N . Ce mac Bul let in. NO 14. Dec. 1975. A Fast Data Acquisit ion Path based on a Camac Memory System.

76K337 WA. KRUSE, R.G. KIRSTE, J. HAAS, B J . SCHMITT, D J . STEIN, Makromol. Cttem. 177, 1145 (1976). Expert-men toller Nachvueis des molekulardispersen Charakters dcr Mtschung von zwei Polymeren und Bestîmmung des chemischen Potentials in dicsen Mischungen.

76K338 H.R. KOCH, H. BORNER, W.F. DAVIDSON, D. HECK, J.A. P1NSTON, R. ROUSSI LLE, P.HJM. van ASSCHË, Proceedings of the In t . Conf. on the Interaction of Neutron-, w i th Nude i . July 6 9, 1976, Lowel l , Mass (in pr in t ) . I n . 7 I Measurements at the Grenoble High Flux Reactor.

76K381 W. K L E Y , W. DREXEL, A . M U R A N I . D. TOCCHETTl , I. SOSNOWSKA, D.K. ROSS, Proceedings of the Conf. on Neutron Scattering, Gatlinburg. Tcnn. 6-JO June 1976, I, 658. The Motions of Hydrogen in O Palladium Hydr ide.

76K406 W. KRESS. A . FREY, B. DORNER. W. KAISER, Pro­ceedings of the Conf. on Neutron Scattering, Gatlrnburg. Term. 6-10 June, 1976, 1 , 216. Lattice Dynamics of GeS.

L

76L31 S.W. LOVESEY, J.M. LOVELUCK, Chapter V I I of a book edited by S.W. Lovesoy end T . Springer "Dynamics of Solids and Liquids by Neutron Scattering" (Springer Verlagl. Magna lie Scattering.

76L38 S.W. LOVESEY, Comments Solid State Phvs.. 7, 117(19761. Magnon-Phonon Hybridization in Magnetic Salts with Un-quenched Orbital Angular Momentum.

76L46 A J : LEADBETTER, P.M. SMITH, P. SEYFERT. Philos. Mag. 3, 441 11976). Vibrational Properties of Amorphous and T w o Crystalline Modifications of Arsenic as Determined by Inelastic Neutron Scattering.

76L47 A . L 0 1 D L , J . DAUBEfVT, E. SCHEDLER, J . Phys. C, 9 , L33 (1976). Phonon Dispersion in NaF in the Region between Zero end First Sound, measured by inelastic Neutron Scattering.

132 J

L 76L55 F. L I VET, P. HADHAKRISHNA, J . Phys. Chom. Solids (in pr in t ) . Diffuse Scattering of Polai ' .ed Neutrons f rom • N i 2 % T l A l loy .

701.73 S.W. LOVESEY, J .M. LOVELUCK, J . Phys. C, 9 3639 <I976) . Wavelength Oependent Fluctuations In Classical Paramagnets in a Magnetic Field. (.Static Properties.

76L74 S.W. LOVESEY. J .M. LOVELUCK, J . Phys. C, 9 3659 (1976). Wavelength Dependent Fluctuations In Classical Peramagnets in a Magnetic Field. I I . Dynamical Properties.

76L97 R £ . LECHNER, A . HEtOEMANN, Commun., on Physic;, 1 , 213 {19761. Rotational Mot ion in Plastic Ademantant : The Elastic Incoherent Structure Factor.

76L95 R £ . LECHNER, Proceedings o f lha Conf. on Neutron Scattering, Gatlinburg. Teen.6-10 June 1976 ,1 ,310 (1976 ) . Rotational Mot ion in Plastic-Crystalline A daman tan e : Results f rom High Resolution Quasielastic Neutron Scat­tering.

76L114 S.W. LOVESEY, J.M. LOVELUCK, Proceedings of the Conf. on Neutron Scattering, Gatlinburg, Term. 6-10 June 1976, 2, 847. Static and Dynamic Response Functions for a Classical Paramagner in an Appl ied Field.

76L146 A . LOIDL . J . DAU8ERT . H. JEX, E. SCHEDLER. Physics Le t t . 56A, 139 {1976). Zero-and-First-Sound Oamping In NaF Observed by Inelastic Neutron Scattering.

76L156 A J . LEADBETTER, R.M. RICHARDSON, B.A. DASANNACHARYA, Vi£. HOWELLS, Chem. Phys. Lett . 39, 601 (1976). Incoherent Neutron Quasi-Elastic Scat­tering Studies of the Anisotropic Serf-Diffusion in Nematic and Smectic A Phases of Ethy l 444'Acatoxy Benzilidene)-Aminocinnamate IEABAC).

76L160 J M . LOVELUCK. S.W. LOVESEY. Proceedings of the In t . Conf. on Magnetism. Amsterdam, 6-10 Sept. 1976 (in pr in t ) . Properties of a ' " - -Dimensional Magnat in a Magnetic Field.

76L193T Y . LEFEBVRE, Rapport Technique. Fonctionnement provisoire de IN9 avec un multideteciour. Connexion d 'un Oidec 800 et d 'un terminal silont 700 ASR.

76L202 A J . LEAD8ETTER, R.M. RICHARDSON, C.J. CARL1LE, J . Phys. Colloque C3, Supplement au tfi 6 , 3 7 , C3-65 ( 1976). Tho Nature of the S.'^actic E Phase.

76L214 W. LANG, H.G.CLERC. H . W O H L F A R T H , K.H.SCHMIDT, H. SCHRADER, Proceedings of the International Workshop on Gross Properties of Nuclei and Nuclear Excitations. Hirschegg, Kleinwalsertal, Austria, January 12-17, 1976. AED-Conf. 76-015-000 IDarmstadt IKO, 147 (1976). Pairing • n d Nuclear Structure in the Fission of 2 3 5 | j .

76L219 S.W. LOVESEY, J . Phys. C, 9, L625 (19761- Non-Equi­l ibr ium Properties of a Viscous F lu id .

76L240 J.W.E. LEWIS AND S.W. LOVESEY, J . Phys. C. (in pr in t ) . Short Wavelength Collective Density Excitations in Monatomic Liquids.

L 76L319 A J . LEADBETTER, R.E. LECHNER, The Plastic Crystal-line State, Ed . J .N. Sherwood, John Wiley & Sons, 1977 (in pr in t ) . Neutron Scattering Studies.

76L339 F. LARCHE, M. ROTH, J. Z A R Z Y C K I , présente a la Con­ference "Structure of Non Crystalline Sol ids", Cambridge, Sept. 76 l in pr in t ) . Small-Angle Neutron Scattering Study of Glassos Containing Chemical and Magnetic Inhamo-nenii i les.

76L340 P. LAMPARTER, S. STEEB, W. K N O L L , 2 . Naturforsch. 3 1 B , 90 (1976), Struktur von Schmelzen eus dem System Wismut-Antimon mîttels Neuironenbeugung.

76M04 F. MEZEI , Commun, on Phys., 1,81 (1976). Novel Polarized Neutron Devices : Supermlrror and Spin Component Amp l i ­f ier.

76M20T R. M A T H I E U , Rapport Technique. Comparaison des Effets d*uno Contamination Mastique et d'une Contamination Superficielle d'Uranium des Plaques do l'Elément Combus­tible R.H.F.

76M41 A.P. M U R A N I , Phys. Rev. Lett . 37, 461 (19761. Non-Uftiqucneîs of Freezing Temperature of Spins in B«nary Al loys.

76M52 J . MEYER, G. DOLLING, J . KALUS. C. VE7TIER. J . PAUREAU, J . Phys. (Metal Physics) 6, p . 1B99 (1976). Mode Griineisen Parameters in Potassium I.

76M69 R.L. MOSSBAUER, rnys. Rev. (in pr in t ) . Da bye Waller Factors and Lamb Factors in the Scattering of X-Rays, 7-Raysand Thermal Neutrons.

76M70 .. R.L. MÔSS5- UER, J . Phys. (in pr in t ) . Nuclear Resonance Absorpt ion of Gamma-Radiation and Coherent Decay Modes

76M81 P. MORIN, J . PIERRE. D. SCHMITT, W. D R E X E L . J . Pliys. 37. 6 1 1 , (1976). Crystal Field in ErMg, ErPd and related compounds.

76MB2 A.P. M U R A N I , S. ROTH, P. RADHAKRISHNA. B.D. RAINFORD, B.R. COLES, K. IBEL, G. GOELTZ, F. MEZEI J . Phys. F : 6, 425 (1976). Small Angle Critical Neutron Scattering and the Onset of Ferromagnetism in Au-Fe Al loys.

76M9B AP. M U R A N I , Proceedings of the Conf. on Neutron Scat­tering, Gatlinburg, Tçnn. 6-10 June 1976, 2, 657. Small Angle Neutron Scattering Study of a Au-15 at % Fe Altoys.

76M103 F. MEZEI, Proceedings of the Conf. an Neutron Scattering, Gatlinburg, Term. 6-10 June 1976, 2. 670 . Temperature Dependence of Magnetic Moment Distr ibution Around Mn Impurities in I ron.

76M112 J . MEYER, G. DOLLING. J . KALUS. C. VETTIER, J . PAUREAU, Proceedings of the Conf. on Neutron Scattering, Gatl inburg, Tenn. 6-10 June 1976, 1, 243. Pressure De­pendence o f Phonon Frequencies in Potassium.

7GM176 F. MEZE1, P A . DAGLEISH, Commun, on Phys. (in pr in t ) . Corrigendum and First Experimental Evidence on Neutron Supermirrors.

7GM130 S. M A Z K E O I A N , S. MELONE, F. RUSTICHELLI , J. Pi:y». 37, 731 (19761. On the Circular Dichroism and Rotatory Dispersion in Cholcsterk L iquid Crystal* w i th a Pitch Gradient.

76M149 E .WJ . MITCHELL, P.F J . PONCET, R.J. STEWART, Philos. Mag. 34 . 721 (1976). The Iron Pair Distr ibut ion Functions in Molten Rubidium Chloride.

76M1S6 F. MEZEI , Proceedings of the Int . Conf. on Magnetism, Amsterdam, B-10 June 1976. Physica 8 l in pr in t ) . Novel Approach to Polarized Neutron Scattering.

7SM189 A . P. M U R A N I . J . of Magnetism anil Magnetic Materials (in pr int)- Spin glasses : comments on some experimental results.

76M249 A.P. M U R A N I , K. KNORR, K . H J . BUSCH'IW. Proceedings o l the Conf. on &••• lal Field Effects in Mei.iis and Al loys, Zurich, Sept. 1976 (in print). Neutron Inelastic Scatlcring Study of the Compound C e A ^ .

76M34JT R, M A T H I E U , Rapport Technique. Problèmes de Radio-protection posés par l 'uti l isation à l ' Inst i tut d'échantillons ô haute Rad'otoxicitô.

76M342 J.C. MARMEGGI , D. HOHLWEiN, E.F. BERTAUT, Phys. Status Solidi (a) 38 (1976) (in pr in t ) . Magnetic Neutron Laue Diffract ion .Study of the Domain Distr ibution in ft-Fe^g.

76M343 E. MONNAND, J . BLACHOT, F. SCHUSSLER, J.P. BOCQUET, B. PFEIFFER, the LOHENGRIN COLLA­BORATION, G. SADLER. H A . SEL1C,. T A . K H A N , W D . LAUPPE, H. LAWIN, K. SISTEMtCH, Proc. 3rd In t . Con­ference on Nuclei far (ram Stabi l i ty, Cargese 1976, (Report CERN 76-13) (in pr in t ) . Recent Studi-s of the Odd-Mass Sr, Y , Zr and Nb Fission Products (A • 95, 97, 99) .

76M344 H. MElSTER, C. ZEYEN, Scientific Annual Meeting of the "Gruppo Naz'onale d i S t ru l tu ra" Consiglio Nazionale dellc Recerche, Modena. 24-265-1976 (in p r im) . Precise Lattice Parameter Determination in the Critical Region of Phase Transitions.

76M345. R.L. MOSSBAUER, Proceedings of the In t . Conf. on the Interactions of Neutrons wi th Nuclei. July 6-9 ,1976, Lowel l , Mass., 1 , 65 (1976). The High Flux Reactor at Grenoble and its Special Neutron Beam I retaliations.

76M346 F. MEZEI , J. SCHWEIZER, V. JACCARINO, J .H. WERNICK. Solid State Commun., 20 , 533(1976) . Polarized Neutron Study of the Weak Itinerant Ferro magnet (Feo5Coo.s)Si.

N „ _ 76N37T A . NAMENSON, Tec h n feat Report. A Guide to Program " B u r n u p " .

76N1D7S A.C. NUNES, Scientific Report. A Polarizing Neutron Guide a ' t h e l . L . L .

76N161 A.C. NUNGS. K. SOFFGE, K . ST1ERSTAOT. Phys. Let t . 68A, 337 (1976). Neutron Depolarization and Trans mis» on by a Nickel Single Crystal near T c .

76N167T A.C. NUNES, Technical Report D14 '1976).

76N194 P. NOZIERES, Livre Collecti f , t ransformat ions Thermo­dynamiques presque Rcveisibles : Adiabatisme et Dissipation.

76N347 H. NOEL, P. WOLFERS, G. F I L L 1 0 N , I I . Hi. Conf. on the Electronic Structure of the Actinides, Wroclaw (Poland), Sept. 1976 ( in pr int) . Magnetizaltort Measurements of the Ternary Uranium Selenides VUS*3, CrUS*3 and Co US eg.

76N348 C.H. de NOVION. B.E.F. FENDER, W. JUST, Ptutonium «nd other Aciinirles. Eds. H. Blank and R. L INDER. 893 (1976). Study o ' Atomic Short-Hange Order in Non-stoi-chit»metric Actinide Carbides by Diffuse Neutron Scattering.

76P07 J.A. PINSTON, R. ROUSSILLE. H. BORNER, H.R. KOCH, D. HECK, Nucl . Phys. A264, 1 , (1976). Level Structure of 149«d ( l ) . T h e 1 4 8 N d ( n . 7 ) Reaction.

76P33 J A . PINSTON, R. ROUSSILLE. H. BORNER, W.F. DAVIDSON, P. JEUCH, H.R. KOCH, K. SCHRECKEN-BACH. O. HECK, Nucl . Phys. A270, 6 1 . Rotational States In 1& lNd Populated through Thermal Neutron Capture.

76P220 J A . PINSTON, H. ROUSSILLE, G. SADLER, W . T E U T E N , J.P. BOCQUET, B, PFEIFFER, D D . WARNER, Nucl. Phys. l in p r in t ) . Level Structure of 1 4 9 N d ( I I ) . The Decay of 1 4 9 P r .

76P246 L. PINTSCHOVIUS, R. CURRAT, H. KAHLERT, Proc. Conf. on Organic Conductors and Semiconductors, Si of ok (Hungaryl Sept. 1976). (in pr int) . Acoustic Phonons of Polysuifur Nitr ide, | S N ) X .

76P255 A . PIERREFEU, E.F. STEIGMEIER, B. DORNER, Phys. Statu* Sofidi (in pr in t ) . Inelastic Neutron Scattering In SbSI near (he Ferroelectric Phase Transformation.

76P349 J A . PINSTON, R. ROUSSILLE, H. BORNER, W.F. DAVIDSON, D. HECK, H.R. KOCH, K. SCHRECKEN-BACH, Proceedings of the Int . Conf. on the Interaction of Neutrons with Nuclei, Lowel l . Mass., July 6-9 1976. Nuclear Structure Study o f 1 4 7 - , 4 9 - 1 5 1 N d .

76P350 J A . PINSTON. R. ROUSSILLE, H. BORNER, W.F. DAVIDSON, H.R. KOCH, K. SCHRECKÉNBACH, Pro­ceedings of the Int. Conf. on Selected Topics in Nuclear Structure. Dubna, June 15-19. 1976. 1, 61 119761. Levels in 147,149. J 5 l N t j .

76P352 P. PATTISON, M. COOPER, J.R. SCHNEIDER, Z. fur Physik, 825, 155 (19761. The Experimental Compton Profile of Deuterium in NbO 0 6 .

134

76P353 M. PRAGER, H. A L E F E L D , A . HE IDEMANN, X I X ' h Congress Ampere. Heidelberg, 27 Sept. - 1 Oct . 1976. The Tunnel Split t ing of the NHd-Librational Groundslate of NH4CIO4 Measured by Inelastic Neutron Scattering (INS)..

76P354 C. PICOT, R. OUPLESSIX, 0 . DECKER, H. BENOIT, F. BOUE, J P . COTTON, M. DAOUD, B. FARNOUX, G. JANNINK, M. N lERL ICH, A J . da VRIES, P. PINCUS, Macromoteculei ( in pr int) . Neutron Sea i n ring by UnrsxaOy Hot stretched Polystyrene Sample*.

R :

76R01 C. RISTORI. M. ASGHAR. J . C f iANCON, JJ». GAUTERON, Z . Phy i . A277. 71 (1976). Nuclear Charge Dist r ibut ion!

f rom 4 f lJj Measurements on Mass Separated Fragments f r o m 2 3 5 u ( n t h , u .

7$R06 C. R IEKEL . D. HOHÎ.WEIN, R. SCHÔLLHORN, J . o f Chemical Co mm. no 2 1 , 863 (1976). The Orientation of Pyridine In Niobdrsulftde | N b S 2 (C5H 5N)o,5>- A Neutron Diffract ion Study.

76R34S F. RUST ICHELU. Scientific Report. Experience da Véri­f icat ion de la Théorie Dynamique pour les Neutron*.

76R36 M. ROTH, J. Appt . Crystallogr. (in pr in t ) . The Small Angle Scattering of Neutrons oy Surface Imperfections.

76R134T 76R144 P. RIBON, Technics! Repont . List of Computer Programs for College 3 Users (76R134), A - Lohengrin (7GR135). B • Gams (VCR 136). C * Bill (76R137). O - Programs of General Interest for Level Scheme I76R13SI. E - Neutron

Beams. F - Subroutines of General Use (76R140). J - Miscellaneous (76R144).

76R212 H . RAUCH. G. BADUREK, W. BAUSPIESS, U. BONSE, A . ZEIL INGER, Proceedings of the In t . Con f .on Interaction of Neutrons with Nuclei, Session PD2, Lowel l , Mass. July 6-9.1976. ( in p r i n t l . Determination of Scattering Lengths end Magnetic Spin Rotations by N tu t ron Inter lerometry.

76R403 A . RENOUPREZ, F. FOUILLOUS, G. CONDURIER. R. STOCKMeVER, D. TOCCHETTI , Transaction Faraday Soc.. 73, 1 (1977). Different Species of Hydrogen Chemi-sorbed on Raney Nickel studied by Neutron Inelastic Spee-Iroscopy.

76R404 D. H ICHT£R, B. A L E F E L D , A. HEIDEMANN, N. W A K A B A Y A S M I , J . Physics F. ( in pr in t ) . Investigation of the Anomalous Temperature Dependence of the Self-Diffusion Constant of Hydrogen in Niobium by Quasielastic Neutron Scattering.

S

76S15 J.R. SCHNEIDER. Acta Crystallogr. A33 , (in pr in t ) . Ex­t inct ion Corrections Theory and Experiment Results of Y-Ray Di l f ractometry,

76S22 G. SIEGERT. H. WOLLNIK , J. GREIF , R. DECKER, G. F IEDLER, B. PFEIFFER, Phys. Rev. C14 (in pr in t ) . The Nuclear Charge Distr ibution of Fission Products f rom 2 3 5 U l n i n , f ) 01 the Masses 79 to 100.

76S57 M. STE1NER. C. B6RTHET-COLOMINAS, J . of Magnetism and Magnetic Materials (in pr int) . Measurements of the Temperature Dependence ol the Correbtion-Length in the Finite Chain S V n « m CsNiFg (2% Mgl .

W 7 6 S 7 1

D. SHERRINGTON, Phvs i» Bul let in. 348, Aug. 1976. Collective Excitations.

76S72 W.G. ST IRL ING, R. CURRAT, J . Phys. C 9, L619 (1976). Experimental Verif ication of tha Phonon OHpersion Curves of Stront ium Tl tana te.

76S76 O. SHERRINGTON, Phys. Lett . 58A. 36 (1976). A C U n of exactly Soluble Random Spin Systems.

76S77 B.W. SOUTHERN, J . Phys. C, 9, 4011 (19761. Effective Field Approximations for disordered Magnets.

76S8S

K. SISTEMICM, P. ARMBRUSTER, J.P. BOCQUET, CH. C H A U V I N , Y . G L A I Z E . Nue I. I nn r . and Methods, 133. 163 (1976). Energy Resolution and Nuclear Charge resolving Power o f i n loniatton Chamber for Fission Products.

76S106 M . SCHLENKER, J . BARUCHEL. Proceedingi o f the Conf . on N tu t ron Scattering, Gatlinburg, Tenn. 6-10 June 1976, 2, 1136. Neutron Dif f ract ion Topography : Recent Results in the Investigation of Domains and Crystal Defects.

76S120 K.H.SCHMIOT, H . W O H L F A R T H , H.G. CLERC, W. L A N G , H. SCHRADER, K.E. PFEROEKAMPFEf l , Nuct. Instr. Meth. 134, 157 (1976). Energy Loss. Energy Straggling and Angular Straggling of heavy lon t in Carbon Foils.

765125

D. SHERRINGTON, P. RISEBOROUGH, CNRS Symposium on Metat-Non Metal Transitions. Autrans. 28J3-1.7.1976 (France). J . Phys. Colloque, 37, C4-255 (1976). Ionic Size Effects in Valence Transitions.

76S145

P. SEYFERT, D. F E L T I N , J.L. R A G A Z Z O N I , H. G L A T T L I , P. ROUBEAU, Proceedings o f the Sixth Int . Cryog. Conf. Grenoble, 11-14 May 1976,178 1)976). Ed . K. Mendelssohn. IPC Science and Technology Press (UK) . A Cryogenic Neu­t ron Polarization Fi l ter.

76S165 R. SCHERM. E. SCHEDLER, V. WAGNER. G. DOLL ING, R. RITTER, W. TEUCHERT, Nuc(. Iratr. and Methods (in pr in t ) . A variable curvature analyser crystal for thrfr j-axis spectrometers.

76S204 K » . SCHMIDT, H .WOHLFARTH. W. LANG, H.G. CLERC, H. SCHRADER, Contr ibut ion aux Journées d'Ecudt» sur la Fission a Aussois, 24-26 Mai 1976. Détermination oa la Chuge et de la Masse Nucléaire des Ftagments de Fission dans la Réaction 2 3 5 i j ( n , n , f ) .

76S211 HJ3. STUHRMANN, J . HAAS, K. IBEL, B. de WOLF, M . H J . KOCH, R. PARFAIT, R.R. CRtCHTON. Proceedings Nat l . Acad. Scj. USA. 73, no 7, 2379 41976). New Low Resolution Model for 60S Subunit of "«cherichia Coli Ribosomes.

76S235S

R. SCHERM. C. CAR LI LE, J . D I A N O U X . J.B. SUCK, J . WHITE, Scientific Report. Scieni i l . Council I n i t r umc i t Subcommittee. Another Time-of-F light Spectrometer o r IN5b is .

76S252 W.G. STIRLING, A J . SMITH, T .M. HOLDEN, P'oceedings of thtr Int . Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976 (in p r im) . Spin-Wave Dispersion Relation h Pc^Fe at 4.2 K.

135

76S356 R. SCHERM, Anal y sen unri Berichte au* Gesallschafi und Wissenschaft, 9 . 109. (1976). Internationale Koopflratkm in der Wissenscriaft.

76S367 H.B. STUHRMANN, J . HAAS. K. IBEL, M X J . KOCH, R.R. CRICHTON, "Proteins of I ron Storage and Trans­port in Biochemistry and Medicine", ed. R.R. Crichton 197b, North-Holland Publishing Company. Amsterdam, 261 (19751. Neutron Scattering o f Ferrit in and Apoferr t t in .

76S35S HJ3. STUHRMA.NN, M.H J . KOCH, R. PARFAIT . J. HAAS. K. IBEL, R.R. CRICHTON, Proc. Na i . Acad. Set. USA (in p r im ) . The Shape of the SOs Subunit of t colt Ribosomee.

76S359 H.B. STUHRMANN, M . H J . KOCH. R. PARFAIT . J . HAAS, K. IBEL. R.R. CRICHTON. J . Mo). Bio l , (in p r in t ) . Deter­mination of the distr ibut ion of Protein and Nucleic Acid in the 70S Ribosomes o l Escherichia Coli end their 30s Su bu ni u by Neutron Scattering.

76S360 H.B. STUHRMANN, H. FUESS, Acta Crystallogr. A32 , 67 (1976). A Neutron Small-Angle Scattering Study of Hen Egg-White Lyso;yms.

7GS362 » • * , . ST IRL ING, R- SCHERM, P A . H ILTON. R A . COWLEY, J . Ptiys. C. 9, 1643 (1976) Keutron Inelastic Scattering f rom Liquid Hel ium Three.

76S363 M. STEINER, 9 . CORNER, Proceedings of the In t . Conf. on Maonetism. Amsterdam. 6-10 Sept. 1976 (in pr int) . Spin Waves in Ferromagnetic Chains - A n Inelastic Neutron Scattering Investigation of CsNi3<2% Mg).

76S364 K. SISTEMICH, G. SAOLER. TA. KHAN. J.W. GRUTER, W.O. LAUPPE, H. LAWIN, H A . SE LI C. F. SCHUSSLER, J . 6LACHOT. J.P. BOCOUET, E. MONNANO. B. PFEIFFER. Proceedings of the 3rd In t . Conf. on Nuclei far f rom Stabi l i ty. Cargése, (Franca) May 19-26, 1976. (CE RN-Report I in pr int . The ^-Decays of Sr and V isotopes in the Mass Chains 96. 98, 100, and the level Schemes of their Y and Zr Daughters.

E.C. SVENSSON, W.Ô. ST IRL ING, A.O.B. WOODS, P. M A R T E L , Proceedings of the Conf. on Neutron Scattering, Gai l in burg, Tenn. 6-10 June 1976, 2 ,1017. Low-Momentum Transfer Neutron Scattering f rom Liquid 4 H e at T — 4.2 K and p — 2 5 a t m .

76S367 R. STIPPLER, F. MÛNNICK, H. SCHRADER. J P . BOCQUET. R. DECKER, B. PFEIFFER, H. WOLLNIK, E. MONNAND, F. SCHUSSLER, Proceedings of the 3rd In t . Conf. on Nuclei far f rom Stabil i ty, Cargèse, (France) May 19-26. 1976. (CERN-Report 76/131 J i n p r im ) . Experi­mental Beta-Decay Energies of Short-Lived Fission Products.

76S368 A J . SMITH, R.A. COWLEY, A.D.B. WOODS, W.G. ST IRL ING, P. M A R T E L . J . Phys. C (in t v in t ) . £*eitat ions in Su perdu kl Helium at large Wave Vectors i ru] Roton-Roton Interactions.

76S369 A J . SMITH, W.G. STIRLING. T .M. HOLDEN, Physica (in p r in t ! . Magnetic Excitations in Pd^Fe.

76S370 M. SCHLAAK. J.C. LASSEGUES. A. HEIOEMANN. R.E. LECHNER, Mol . Phys. t in pr im) . Reorientations in Crystal­line (CH313 MHO studied by Quasielaitic Nau i ion Scat­tering.

76S371 M. SCHLAAK. M. COUZI . J.C. LASSEGUES. W. DREXEL, Chem. Phys. Let t , (in pr in t ) . Inelastic Neutron Scattering Study Of Low-Frequency Vibrations in ( C H ^ NHCl .

76S372 F. SÔFFGE, K. STIERSTADT, G. GÔLTZ, K. IBEL. Solid Stat» Communications, 20, 6 0 1 , 11976). S 1res s-Induced Crossover Phtnamena in Nickel above ils Curie Point.

76S373 F. SÔFFGE. K. STIERSTADT. G. GÔLTZ. K. IBEL. Vertiandlungen OPG 1 1 , 196. 1976. ZuaspannungtmduEiene Anisotropia der Korr elation slang* von Nickel am Curie-punkt T c .

76S390 H. SA IB IL , M. CHABRE, O.L. WORCESTER, Nature, 262 266 (1976). Neutron Dif f ract ion Studies of Retinal Rod Outer Segment Membranes.

76T96 P. T H O R E l , 9 . CROSET, C. M A R T I , J.P. COULOMB, Proceedings of the Conf. On Neutron Scattering, Gall inburg, Tenn. 6-10 June 1976, 1, 86. Two Dimensional Structure o f Mono and Bilayer of Krypton Absorbed on Graphite.

76T147 D. TRANQU1, J . V ICAT. M. THOMAS, M.H. PERA. H. P I L L I O N , C. L U U DUC. Acta Crystal logr. B32.1724 (197GI. Structure Cristalline du Sel de Propylamine de ta Propyl-1 Dicyano-3,5 Phényl-4 Hydroxy 6 Pyrodone-2.

76T152 J . TOPLER, B. A L E F E L D , A. HEIDEMANN. J. Phyt. C (in pr in t ) . Study of the Central Peak of Sr 7 i O3 by Neutron Spectroscopy wi th High Energy Resolution.

76T154 K. TAJ IMA, Y . ENDOH, Y. ISHIKAWA, W.G. ST IRL ING, Phys. Rev. Lett . 37, S19, 11976). Acoustic Phonon Softening in Fe3Pt Invar A l loy .

76T176 D. T R A N O U I , P. BURLET. A . F I L H O L , M. THOMAS, Acta Crystal logr. ( in pr in t ) . Redetermination by Neutron Dif f ract ion of the Structure of Manganese Acetate, Tetra-hydrate (M.A.T.) .

76T229 J . TOMK1NSON, T.C. WADDINGTON. J . Chem. Soc. Faraday Trans. I I , 1245 (1976). Inelastic Neutron Seat-taring f rom Zirconium Borohydride.

76T374 J . TOMKINSON, T.C. WADDINGTON. J . Chem. Soc. Faraday Trans. I I , 2065 (1975). Librationul Mot ion in Potassium A iu r r i r . um Hydride, studied by Inelastic Neutron Scattering.

76T375 J . T O V - ' N S O N , T.C. WADDINGTON, J . Chem. Soc. Faraday Trans. I I , 528 (1976). Inelastic Neutron Scattering f rom the Alkal i Metal Sorohydridos 3»d Calcium boro-hydride.

76T376 D. T R A N Q u i , J . V ICAT, H. F I L L I O N , Acta Cryîtallogr., B32, 1228 (1976). Structure Cristalline et Moléculoire de Methyl (Diphcnyl-2.2) Vinyl Sutton.- (MDVS1.

136

T 76T377 F. TASSET, O.K. CHRISTEN. S. SPOONEfl. H A . MOOK, Proceedir-gi of the Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976. 1 . 4 S I . Small Angle, Double Silicon Crystal, Neutron Diffraction Studies of the Fluxoid Lattice In Niobium.

V 76V02 F. VOLINO. A J . D IANOUX. H. HER VET. Proceedings of the European Conf. on Tharmotropic Smeetlc Liquid Crystals and their Application!, Lai Aies, Dec. 1975, Journal de Physique, Colloques 37 , C3-65 (19761. Neutron Ouasi-Elanic Scattering Study of Rotational Motion in tht Smectic C. H and VI Phase* of Twephtal-BivButyt-Aniline (TBBAI.

76V6B F. VOLINO, A J . D IANOUX, Proceedings of Euehem Conf. on Organic Liquids, structure. Dynamics on Chemical Pro-pertlei, 4-9 April 1976 {in print). New Developments In Neutron Scattering for the Study of Molecular Systems.

76V151 S. V ILMINOT, F. PHILIPPOT, M. LEHMANN, A c » Cfyttal-toflf. B32, 1817 (1976). Affïnement de la Structure de NH f l NH3CH2COOHS04 par Diffraction Noutrontque.

76V236 F. VOLINO, A J . D IANOUX. H. HER VET, Mol . Cryst. and Liq. Cryst. (in print). Incoherent Neutron Quasi-Elastic Scattering (NOES) as a Tool to study Molecular Ordering in Liquid Crystal».

76V260 J . V I L L A I N , J.M. LOVE LUCK. j . Phys. (lettrosl (in print). Neel Température of a Low-Dimensional Antiferromagnet in a Magnetic Field.

76V379 P. VORDERWISCH, S. HAUTECLER, J.B. SUCK, H, DACHS, Proceedings of the 2nd Int. Conf. on Crystal Field Effect! in Metals and Alloys. Zurich, 6-9 Sept. 197E (In print). Noutron Spectroscopy of the Crystal Field Split-ting in Cerium Hydride.

W 76W86 A . W1NNACKER. H. ACKERMANN, 0 . OUBBERS, M. GRUPP, P. HE IT J AIMS, H J . STÔCKMANN, Nuclear Physics A261 , 261 (1976). Nuclear Moments of the (^Emitters ICBAgandHOAg.

76W99 V. WAGNER. W. REICHARDT. W. KRESS, Proceedings of the Conf. on Neutron Scattering, Gatlinburg, Tenn. 6-10 June 1976 ,1 ,175 . Lattice Oynamiciaf MnO.

79W171 V . WAGNER, C.R. BECK--* , ft. GEICK. Proceedings of the Int. Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976 lin print I. Low Frequency Magnons in Ni i^Co^O.

76W216 A.D.B. WOODS, P.A. H ILTON, R, SCHËRM, W.G. STIRLING, J. Phys. C (in print). A New Determination of the Roton Energv in Superflu Id Liquid Helium.

76W221 C. WAGEMANS, P. D'HONDT, A J . DERUYTTER, A . EMSALLEM, M. ASGHAR. Journées d'Etudes sur la Fission, Aussois 24-26 mai 1976. Report BLG 514 ( IS76) . Mesure et Calcul de la Section Efficace de Fission Induite par Neu­trons Thermiques en dessous du Seuil pour quelques Noyaux Lourds.

76W227 H. WOHLFARTH. W. LANG, H.G.CLERC, H.SCHRAOER, K.H. SCHf/ lDT. H. DANN, Phys. Lett., 63B, 275 11976). Mass Distributions of 2 3 5 U | n I n , f| fission products as a function of their kinetic Energy.

7&W24S C.G. WINDSOR, D X . SAUNDERSON. E. SCHEOLER, Phyi. Rev. Lett. 37, 855 (1976). Spin-Wave Damping Wi • Heitenberg Antlferromognet.

7CW380 H . WOHLFARTH, W. LANG. H. DANN, H.G. CLERC, K.H. SCHMIDT, H. SCHRADER, N u d . Instr. Methods, 139. 11976). Pulse Height Defect of Fission Products in a Silicon Surface Barrier Detector.

76W382 P. WOLFERS. G. F tLLION, Proceedings of the V » inter­national Conf. on "Solid Compounds of Transition Elements", Uppsele, Sweden, June 21-25. p 11 £ 9 , (1976). Datocalized Magnetic Moments of Uranium in MUX3 and MU2X5 typed compounds (M = 3d metal, X = S or Se).

76W3B3 P. WOLFEflS, G. F ILLfON, Proceedings of the Int. Conf. on Magnetism, Amsterdam, 6-10 Sept. 1976 (in print). Magnetic Structure of CrU*3 Related Compounds showing Delocalized Moments.

76W384 P. WOLFERS. M. BACMANN, I I , International Conférence on the Electronic Structure of the Actinides, Wroclaw (Poland) Sept. 1976 lln print). Magnetic Structure of FtUaSs.

76W387T S.WILSON,Technical Report. T * t on D6.

76W388 D.L. WORCESTER, in "Neutron Scattering for the Analysis of Biologic ' Structures". Report of the 1975 Brookhaven Symposium In Biology. OP. Schoenborn, editor, r>o 27, 37, (1975). Neutron Diffraction Studies of Biological Mem­branes and Membrane Components.

76W389 D.L. WORCESTER, in Biological Membranes, (D. Chapman and D.F.H. Wailech, edt.l. Academic Press, London, 3, 1 11976). Neutron Beam Studies of Biological Membranes and Membrane Components.

Y 76Y03 AJ>. YOUNG, J . Phys. C, Solid State Phys., 9, 2103 11976). The Critical Bihaviour of Disordered Magnetic Systems. An exactly Solvable Modal.

76YS4 AJ». YOUNG, R.B. STINCHCOMBE, J . Phys. C. (Solid State Phys.) 9, no 24 11976). Real Sp.- n Renormalization Group. Calculations for Spin Glosses and Dilute Magnets.

76Y208 A.P. YOUNG, Proceedings 2nd Int. Symp. on Amorphous Magnetism, Troy (U.S.A.), August 25-27, 1976 (In print). Real Space Renorrmlization Group Calculations for Spin Glasses.

z 76Z14T C. ZEYEN, A. FtLHOL, Technical Report (Jan. 1976). The present State of 0 1 0 .

76Z32 K . R A . ZIEBECK, r"J. WEBSTER, Philos. Mag.. 34. 973 (1976). Th9 Am (ferromagnetic and Ferromagnetic Pro­perties of Fe2MnSi.

76Z100 CALE. ZEYEN, H. MEISTER, Proceedings of the Conf. On Neutron Scattering, Gailïnburg, Tenn. 6-10 June 1976. 1 , 445. Spatial Distribution of the Para- and Farm- elecuic Phases during the First Order Phase Transition in DKDP.

76Z104 K .RA. ZIEBECK, J.G. HOUMANN, Proceedings of the Conf. o r Neutron Scattering, Gailinburg, Tenn. 6-10 June 1976, 2, 840. Magnon-Pnonon-Hybridization in FeCl2.

137

PUBLICATIONS INDEX BY AUTHOR

This is intended as an index to the previous list. It gives all the publiDations in which a person has cooperated, but need not have been the principal author.

ACKERMANN H. 75A216 BADUREKG. 78B09 BERTHET-COLOMINAS C . 76S57 76A294 7BB53 BESERMAN R. 7BB43 76D397 76R212 BEYNETA. 76B13T 76H164 BAILEY 1. 76H56 BICKERMANNA. 75B31B 76W86 BAILLEULG. 7SP237 BLACHOTJ. 75P237

AGGERBECK L. 75L31S 75S2S6 75S256 AHTEEA. 76A80 BALDWIN J.P. 76C206 76M343 AHTEE M. 75A316 76H331 76S364

76A80 76H332 BLANCHARD P. 76B90T ALBERTINI G. 76A11 BANKS P. 76J237S 76B43T

76A78 BARBARAS. 76B117 BLANCKENHAGEN P. V. 76H247 76A128 76B16S BLASCHKO 0. 76B304 76A361 76B29B BLETRYJ. 76B24

ALOEBERT P. 75A46 76B299 BLOCH D. 75B229 ALEFELDB. 7BR298 BARGOUTH M.O. 76 B118 76B196

76P353 BARTHELEMY A. 76B67T 7619? 76R404 76B270T BL JCK R. 76B306 76T1S2 76B287T 76B307

ALLEN D. 76A97 BARTHET C. 76H328 BLUM E. 76B253T ALLEN G. 75A299 BARTUNIK H.D. 75BI95 BOCQUET J.P. 75A92

76H213 75F177 75P237 ALMAIRACR. 75R261 BARUCHELJ. 76S10B 75S2b6 ANDELO.iR G. ' 76K132T BASSI G. 75F124 76A61 ANOERSSON G. 76A18 BASTARD G. 75B155 76A83

76H20O BAST IE P. 75B05 76M343 ARMBRUSTER P. 76A61 75B198 76P220

76A83 BAUDOUR J.L. 76B301 76S85 76A295 76B302 76S364

76S85 76C309 76S367 ASGHAR M. 75A92 76C50 BOEUF A. 76A11

75P237 BAUSPIESSW. 76B09 76A78 75W244 76853 76A361

7BA08 76BB4 BONNET M. 75F124 76A18 76B108 76B29 76A61 76B262 BONSE U. 76B63

76H2D0 76R212 76B84 76K224 BEAUDRY P. 76B158 76B108

76R01 BECKER C.R. 76W171 76B262 76W221 BECKER P. 76B29 76B296

VAN ASSCHE P.H.M. 75V265 BEILLEJ. 75B257 76R212 76K338 76B196 BORNARELJ. 75B05

AXMANN A. 76K33B BENOIT H. 76D39S 75B198 BACMANN M. 75W196 76D399 BORNER H. 75V265

76W384 76P354 76B303 BACON G.E. 76B300

76C88 BERTAGNOLLI H. 76B199

76B244 76B407

SADIE J.M. 75A46 BERTAUTE.F. 76M342

BORNER H. 76K338 76P07 76P33

76P349 76P350

BOSIO L. 76BI29 BOUCHERLEJ.X. 76B117

76B168 76B174

• 76B299 BOUE F. 76C316

76P354 BRADBURY E.M. 76C206

7BH331 76H332

BRANDO D'OLIVEIRA A. 76B127 BRAUMANDL F. 7SR204

76B303 BRIQGS G.A. 76B234T BRODSKY DOYLE B. 75M276 BROWN P.J. 75B146

76B105 76B116 76B297 76C181

BUEVOZJ.L. 75A46 BUHRERW. 7BDI04 BULDTG. 76B101 BURGER N. 76B305 BURLET P. 76T176 8USCHOWK. H.J. 76G248

76M249 CAILLEAU H. 76B301

76B302 76C50

76C309 CALECKI D. 76C182

7SC308 CAPIOMONTA. 76B116 CAPPONI J.J. 75C2B3 CAREL C. 76C40 CARLILE OJ. 76C179

76L202 76S235S

CARPENTER 8.G. 76C206 CARRARA P. 76C256 CASTAGNE D. 76C309

76C210 CASTETS A. 76C169 CATTI M. 76C21B

76C312 CESINIG. 76A11 CHABRE M. 76S390 CHANCEL L. 76C40 CHARDONNETB. 7BC253T CHASSEAU D. 75C309

76C210

CHAUVIN CH. 76A83 76S85

CHEEKE J. D. N. 7BS208 CHEETHAM A. K. 75CB6 CHENAVAS P. 768116 CHERY R. 76A08 CHEVALIER R. 76C192T CHIEUX P. 7BCI40

7BC266 76B199 76B244 76J148

CHRISTEN D. K. 76C314 76T377

CHRISTENSENA. N. 76C310 76C311

CLAUDETG.M. 75C1S2 CLERC H.G. 76L214

76S120 76S204 76W227 76W380 76C205

COLES B.R. 76M82 COLOMB A. 75C283 COMES R. 75C286

75D284 76D392

CONDURIERG. 76R403 CONVERT P. 70K119 COOPER M. 76C313

76P352 COPLEY J. R. D. 76C26

76CI63 COPPENS P. 76CI72 COSTA M. M. R. 76C18I COTTON J. P. 75A299

76C316 76D398 76D399 76P354

COULOMB J. P. 76T96 COUZI M. 76S371 COWLAMN. 76B300

76C88 COWLE 1 R. A. 75S322

76S362 76S368

COXS. 76J237S CRANCON J. 76K224

76R01 CRAWFORD G. 1. 76K224 CRICHTON R. R. 75S313

76S211 76S357 76S358 76S369

CROSET 8. 76T96 CURRAT R. 75C286

70D284 76D228 76P246 76S72

CYROT-LACKMANN F. 76D64 75D136

DACHSH. 76KI19 76V379

DAGLEISH P. A. 76MI26 DANIEL H. 768127 DANN H. 76W227

76W380 DAOUD M. 76C316

76D398 76P3S4

OARLINGTON C. N. VI. 75F246 DASANNACHARYA B.A.76L156 DAUBER r J. 76D228

76L146 76L47

DAVIDSON W. F. 76V265 76B303 76K338

76P33 76P349 76P350

DAVIS J. R. 760102 DEBAECKER F. 75C266 DECKER D. 76P364 DECKER P. 76D399 DECKER R. 75P237

75S219S 76A6! 76S22

76S367 DEL MORAL A. 76G326 DELAPALME A. 75F124

76B29 DELUGEARD Y. 76B302

76CS0 DENOYER F. 75C286

75D284 DEPORTES J. 76D401

76D75 DERRIENJ.Y. 76D48 DERUYTTER A.J. 75W244

76A08 76W221

DESCLAUX J. P. 7SD201 7BI;159 75K191 751.160 75M108 7K!238 76B168

DESCLAUX J. P. 76D395 DUPUIS P. 76C210 FOUILLOUS F. 76R403 DESJONQUERESM.C. 75D64 DUPUY J. 76D48 FRANZ H. 76K224

7SD136 76J148 FREEMAN A.J. 75F159 DESUCHE J. 76B302 DUVAL M. 76D399 75LI60

76CS0 ECKOLD G. 75E220 75M108 D'HONDT P. 75W244 VON EGIDY T. 76B127 75S23B

76A08 76J402 FREUNDA. 76F150 76W221 EMSALLEMA. 75HI244 FREYA. 76K406

DIANOUX A. J. 75H227 76A0B FREYLAND W. F. 78B306 75V101 76A1B 76B307

76D94 76H200 FUESS H. 7SC56 76S235S 76W221 75D38S

76V02 ENDOH Y. 76T154 75F124 76V6B EPPERSON J. E. 76A97 75F177

76V236 76G324 78B29 DIGGORY A. 76DIB7T ERNST G. 76B304 7 . -250 DIGGORY A. F. 76B303 ESCRIBE C. 76C256 765360 DO HUU PHUOC 76B303 ESCUDIER P. 76E318 76B30S DOLLING G. 75M251 ESSAM J. W. 75E282 FUNAHASHI S. 76F49

76D207 EWALD H. 78AS1 FUNKE K. 75E220 76M52 FABERJ. 75F159 GAMLEN P. H. 75G306

76M112 75L160 GAULTIER J. 7BC309 76S165 FARNOUX B. 75A299 76C210

DORNER B. 75D104 76C316 GAUTERON J. P. 76R01 75D117 76D398 GAUTIER F 75G28I 75D129 76D399 76G242 76D197 76P354 GEICK R. 76W171 75P1BS FELTIND. 76J237S GELLER R. 76K119 75S20B 76S145 DE GENNES P. G. 76D398 76D392 FËNDER B. E. F. 7SC56 GERBAUXX. 76H328 760393 7SN146 GERLM. 75T189 76D394 76J89 GEROLD V. 76A97 76K406 76N348 7BG324 76P265 FERRARIS G. 76C2I8 GERVASIOG. 76C312 76S363 FIEDLER G. 76S219S GHOSH R. E. 75A299

DRAPERI A. 7SD142 76S22 75D197 DRESS W. B. 76D183 FILHOLA. 75C309 76G1t1 DREXELW. 75B43 76B270T 76G124T

75W68 76C210 •"6H213 76D281 76C218 GIGNOUX D. 76E318 76H409 76F16 76G326 76K381 76F271T GILLISJ. M. 7BW279 76M81 76G325 GIRARD A. 7BB302

76S371 76T176 76C50 DUBBERSD. 75A216 76Z14T 76C309

76A294 FILLIONG. 75W196 GIRAUDJ. P. 76B298 76D396 76N347 GIVORD D. 76D75 7BD397 76W382 76D401 76H164 76W383 76E3I8 76W86 FILLIONH. 76TI47 76G326

DUEE E. D. 75D38S 76T376 76G327 DULTZW. 76D228 FITZGERALD W.J. 75F246 GLAIZE Y. 76A83 DUPLESSIX R. 7SD398 FOGEDBY H. C. 75F226 76S85

76D399 76F60 GLASER W: 76B306 76P354 FOGELBERGB. 75S266 76B307 76C316 76F320 GLATTLI H. 76S145

DUPUIS P. 75C309 FORSYTH J. B. 76B297 GLAZER A. M. 76A80

GLYDE H. R. 75M25! HAUW C. 7BC210 HIGGINSJ.S. 76GI24T GOBERT G. 76C40 HAYTER J. B. 76H115 76H107

76G322T 76H329 76H2I3 GOELTZ G. 75M209 76H330 76H25S

76G124T HECHT A-M. 75H304 76H328 76GI5S HECK 0 . 76K338 HILTON P. A. 75S322 76MB2 76P07 78H109

76S372 76P33 76H226 76S373 76P349 76S362

GONDRAND M. 75C2S3 HEIDEMANN A. 75H230 76W216 GOWMAN J. 76B13T 75H271 HINKELMANN H. 75H218 GRAEFF VI. 76884 75R298 75H95

76B262 76094 76H21 GRAND A. 76G325 76H10 76H90 GREIFJ. 75P237 76H159 76H264

75S219S 76H188 HJELM H. P. 76H331 76A61 76L91 76H332 76S22 76P353 HOHLWEIN 0. 75H112

GREVAZ M. 76G28T 76R404 76F250 76G39T 76S370 76H42S 76G66T 76T162 76K231

76G185T HEITJANS P. 75A2I6 76M342 76G321 76A294 76R05

GRIMM H. 76G198T 76D397 HOLDENT.M. 76S2S2 GROSS W. 76G248 76H1S4 76S369 GRUNBERGMANGO M. 76B158 76W86 HOLLNIKH. 76S22 GRUPP H. 76A2I6 HELL W. 75A2I6 HOUMANN J. G. 76Z104 GRUPP M. 75A216 HENNING K. 76H409 HOWELLSW. S. 76H122T

76A294 HENNION B. 75R261 76H213 76D397 75W223 76LI66 76G408 76C169 HUBERMANN B. A. 76H21 76H164 76H190 HUBERT L. 76C40 76W86 76H334 HULMES D. J. S. 75M276

GRUTER J. W. 75S266 HENNION M. 76H190 HUTCHINGSM. T. 75H323 76S364 HENSEL F. 76B306 76H195

GUMPERTSBERGERG. 76G177 76B307 76H334 GWILYMK. M. 75E282 HERRMANN G. 76K224 IBELK. 75M209 HAAS J. 75M276 HERRMANN- 75DI42 75M276

7SS313 ROIMZAUD D. 76H333 75S313 76K337 HERVETH. 75H47 75W279 76S211 7BH227 75W303 76S357 7SH245 76C206 76S358 75V101 76H331 76S359 76D94 76M82

HADNI A. 76H32B 76V02 76S2II HAGBERG E. 76A18 76V236 76S357

76H200 HETZELT M. 7BH230 76S358 HAMELIN B 76H134 76H411 76S359 HANSEN 1: 76C310 HEWATA.W. 7SA316 76S372

76C311 76A80 76S373 HAPPE L H. 76H247 76H56 ICHE G. 751259 HARBEKEG. 75D197 HEY P. D. 76C179 76117 HARRIS N. 76J237S HICKS T.J. 76D102 INSTITUT HARTMANN F. J. 76B127 76H184 LAUE-LANGEVIN 76162 HASER R. 76H87 76H191 76163 HAUTECLEH S. 76V379 HIGGINSJ.S. 75A299 ISHIKAWA Y. 7fl241 HAUW C. 75C309 76G111 76192

ISHIKAWA Y. 76T154 KLESSE R. 76K336 LANGW. 76W227 JACCARINOV. 76J355 76K132T 76W380

76M346 KLEYW. 75Z151 LARCHE F. 76L339 JACOBE J. 75C253T 76D28I LARYSZJ. 7BR204

75J7ZT 76K3S1 76B303 76J410 KNEALEG. G. 7BH331 76J402

JACOBE V. 7BB195 KNOLL W. 76K180 LASS6GUESJ.C. 75H271 JACOBSON A. J. 76J89 76L34D 76S370 JACROT B. 75J128 KNORR K. 760228 76S371

76B158 76G248 LAUPPE W. D. 75S2S6 76J64 76H247 76M343

JAL M. F. 76J148 76K241 76S3B4 JANNINKG. 75A299 76M249 LAWIN H. 75S2S6

76C316 KOCH H. R. 75V265 76M343 76D398 76K338 76S3G4 76D399 76P07 LEADBETTERA.J. 78L46 76P354 76P33 76L1S6

JENKIN G. 75M276 76P349 76L202 76J237S 76P350 76L319

JEUCH P. 75R2Q4 KOCH M. H. J. 75S3I3 LECHNER R. E. 7SB318 76B303 75S2I1 75E220

76J30 75S357 75H227 76J113 75S358 7SH271 76J402 75S3S9 76L91 76P33 KOREKAWA M. 76J335 76L95

JEXH. 76D228 KOSTORZ G. 76A97 76L319 76L146 76G124T 76S370

JONSON B. 76A18 76G324 LECKEBUSCH R. 76A294 76H20C 76K12 LEFEBVRE Y. 76L193T

JOST A. 76J40 76K59 LEHMANNM.S. 75C172 JOSWIG W. 75H112 70K222 75C283

78J335 KOSUGE K. 76H10 7BC310 JOUBERTJ.C. 7SC283 76H188 76C311 JUST W. 75N145 KOTZLER J. 76K241 76L238

75R235 KRATZ K. L. 76K224 76V151 7BS76 KRESS W. 76K406 LEMAIRE R. 76B298

76N348 76W99 76D401 KACHI S. 76H10 KRUSEW.A. 76K337 76E318

76H188 KURTZ W. 76K119 76G327 KAHLERT H. 76P246 LAFORESTJ. 76B298 LEWINEHC. 76C182 KAISER W. 76S219S 76G327 76C308

76K131T LAGOMARSINOS. 7BH47 LEZISJ. W. E. 76L240 76K232T 7BH245 LIAUD P. 75L321

76K406 76A128 LIPPOLD B. 76H409 KAJZAR F. 76H190 76A361 LIVET F. 7BL11

75K166 LAJZEROWICZ J. 7BB05 76LS5 KALUS J. 75E220 7SB198 76L22B

76M52 LAMBERT M. 7BC286 LOHENGRIN 7GM343 76M112 7S0284 LOIOLA. 76LI46

KAUN L. P. 76H409 LAMPARTER P. 76L340 76L47 KHAN T. A. 75S256 LANDER G. H. 76F159 LOVELUCK J. M. 7BE282

76M343 75L160 76L31 76S364 LANG W. 76C205 76L73

KIM YONGKI 75K191 76L214 76L74 KIRKWOOD D. H. 76C8B 76S120 76L114 KIRSTE R. G. 76K337 76S204 76L160 KLAR B. 76K121S 76V260

LOVESEY S. W. 76C163 MEZEI F. 76J355 NUH F. M. 76K224 76L31 76M04 NUNESA.C. 76N157S 76L38 76M82 76N161 76L73 7SM103 76N167T 76L74 76M126 O'BRIEN E. J. 7SW279

76L114 76M186 OSER R. 760399 76L160 76M346 OHM H. 76K224 76L219 MILLER A. 75M276 VON DER OSTEN W. 75D104

• 76L240 75W303 PARFAIT R. 7BS211 LOWOE R. D. 76HI9S MILLER P. 0. 76D183 76S358

76H334 MITCHELL E.W.J. 76M149 76S359 LUU DUC C. 76T147 MOLL E. 76A61 PARISOTG. 75B229 LUZZATI V. 75L315 MONNAND E. 75S256 76B196 MACK B. 76C179 76M343 76H19B MALLOW J. V. 75M108 76P237 PARLEBASJ.C 75G281 MAMPE W. 7SR204 76S364 76G242

76F320 76S367 76P19 76J133 IWOOK H. A. 7BC314 PASTOR G. 76G66T 76J402 76T377 PATAUD P. 75B257

MARGUERIEG. 75M29I MORAITIS G. 75G281 75R235 MARMEGGI J. C. 76M342 MOREVA N. 1. 76H409 76P175 MARTEL P. 76S366 MORIN P. 76MB1 PATTISON P. 76C313 MARTI C. 75B43 MÔSSBAUER R. L. 76M69 76P352

75M62 76M70 PAUREAU J. 758229 76T98 76M345 75D142

MASON S. A. 7SD38S MOURRATM. 76G322T 76M52 76C312 MOUSSA F. 76F49 76M1I2 76F250 MUNNICK F. 76S367 PAVLOVICA.S. 76H333 76H87 MURANI A. 76D281 PENDLEBURYJ. M. 76D183

MATEU L. 75L315 76H247 PENFOLDJ. 76H329 MATHIEU R. 76M20T 7BK3B1 PERA M. H. 76T147

76M341T MURANI A. P. 7SM209 PERRINP. 760183 MATTHIESS. 76H409 76E318 PETERLIN-MATZW. 76H409 76G248 NEUMAIERT. 76P248 MAZKEDIAN S. 75M75 76M41 76P223

76A11 76M82 PETERSEN H. U. 758158 76A78 76M98 PFEIFFER B. 75S219S

76A128 76M189 76A61 76A361 76M249 76M343 76M130 NAMENSON A. 76B303 76P220

MEINNELJ. 76B302 76N37T 76S22 MEISTER H. 76M205 NEELJ. 75C309 76S364

-76Z151 76C210 76S367 76M344 NIERLICHM. 76P354 PFEIFFEHP. 75J128 76Z100 76C316 75P237

MELONES. 76A11 NOEL H. 76W196 75S256 76A78 76N347 PFERDEKAMPFER K.E 76SI2C

78A128 NOUETJ. 7BH261 PHILIPPOTF. 76V161 76A361 OE NOVION C. H. 7SN145 PICOT C. 76C316 76M130 76N348 76D398

MESSOLORASS. 76A97 NOZIERES P. 75B155 76D399 MEYER A. 7B8118 751259 76P354 MEYER H. 75B318 75N138 PIERRE J. 76M81 MEYER J. 75M251 75T189 PIERREFEUA. 76P188

76M52 76C1B2 76P255 7GM112 76C30B PINCUSP. 76P354 76M153 7BN194 PINSTONJ. A. 75P237

143

PINSTON J. A. 75R204 ROSSIGNOL M. F. 76B1B8 SCHERM R. 76S362 76B303 76B299 76W216 76K338 ROTH M. 76192 SCHLAAK M. 76H271

76P07 76L339 76S370 76P33 76R36 76S371

76P220 ROTH S. 76MB2 SCHLENKER M. 76S106 76P349 ROUBEAU P. 76J237S SCHMIDT K. H. 7BC205 76P360 76S145 76L214

PINTSCHOVIUS L. 76P246 ROULT T. G. 75A46 76S120 PONCET P. F. J. 76M149 ROUSSEAU M. 76R261 76S204 PRAGER M. 76P353 ROUSSI LLER. 75P237 76W227 PRUSSIN S. G. 76K224 75R204 76W380 QUITTET A. M. 76C286 76B303 SCHMITTB.J. 76K337 RADHAKRISHNA P. 75B2S7 76K338 SCHMITT D. 76M81

761241 76P07 SCHNEIDER J. 75S76 76L11 76P33 SCHNEIDER J. R. 75B05

75R235 76P220 75B198 76B116 76P349 75S2B2

76L55 76P350 76B304 76M82 76R259 76C3I3

RAGAZZONI J. L_ 76J237S ROZZI V. 76A78 76L238 76S145 RUDOLPH W. 76K224 76P352

RAHMAN A. 76C26 RUSTICHELL1 F. 75H245 76SI5 RAINFORD B. D. 76M82 7BH47 SCHOLLHORN R. 75R193 RAMSEY N. F. 76D183 75M76 76B05 RAUCH H. 76B09 75R211 SCHRADER H. 75A92

76B53 75R320 75P237 76B10B 76A11 75S266 76B262 76A78 76A61 76B29B 76A12B 76B13T 76R212 76A361 76C205

RECKER K 76A294 76M130 76L214 REDOULESJ. P. 76C256 76R34S 76S12fl REES B. 75J40 SACCHETTI F. 76K166 76S204 REICHARDT W. 76W99 SADLER G. 75S256 76S?17 REIKH.G. 7BH9S 76M343 76V»^27 REMPPP. 76D399 76P220 76W380 RENOUPREZ A. 76R403 76S364 SCHRECKENBACH K. 75R204 REVELLI J. 75S208 SAIBILH. 76S390 76B303 RIBON P. 76R134T SARDET C. 75L31B 76J402

76R144 SARMA G. 76D398 76P33 RICHARDSON R. M. 76L156 SCANU A. M. 75L316 76P349

76L202 SCHAEFER A. 76G242 76P360 RICHTER D. 76R298 SCHEDLER E. 76B129 SCHUCK P. 7BG177

76H159 76L47 SCHUSSLER F. 75P237 76R404 76L146 75S2B6

RIEKELC. 75H18S 76S165 76A61 75R193 SCHEITHE W. 76K241 76M343

76R0S SCHERM R. 75B318 76S364 RISEBOROUGH P. 76S125 75H323 76S367 RISTORI C. 76K224 75M251 SCHWEIZER J. 76B116

76R01 75S322 76B117 RJTT6R R. 76S16S 76H109 76B16S ROBERT J. B. 76G325 76H226 76B174 ROSS D. K. 76D281 76S165 768298

76K381 76S235S 76B299 ROSSIGNOL M. F. 76B117 76S356 76D75

SCHWEIZER J. 76J355 76M346

SEELIGA. 76B101 SEELIGJ. 76B101 SELF A. G. 76B300 SELICH.A. 76S266

76M343 76S364

SEYFERTP. . 76H409 76J237S

76L46 76S145

SHAANAN M. 76S256 SHERRINGTON • . 76S71

76S76 76S125

SIAUD E. 76B298 SIEGERT G. 76A92

7SP237 76S219S

76A61 78S22

SIENKOM. J. 75C26S SISTEMICH K. 75S256

76A83 7GM343

76S85 76S364

SMITH A. J. 76S252 7ÔS368 76S369

SMITH P. M. 76L46 SMITH S. R. P. 75H323 SÔFFGE F. 76S372

76S373 SÔFFGE K. 76N161 SOSNOWSKA 1. 76D281

76K381 SOUTHERN B. W. 76S77 SPITZER H. 75B318 SPOONER S. 76C314

76T377 SPRINGER T. 75P248 ST ASSIS C. 75S238 STEEBS. 76L340 STEIGMEIER E. F. 75P188

76P255 STEIN D. J. 76K337 STEIN-ARSIC M. 75B318 STEINBERG R. 1. 75L321 STEINERM. 750129

76F49 76SS7

76S363 STEWART R. J. 76A97

76M149 STIERSTADT K. •>SN161

STIERSTADT K. 76S372 76S373

STILLER H. 75B318 STINCHCOMBER.B. 76Y54 STIPPLERR. 76S367 STIRLING W. G. 75S208

75S322 76R231T

76H109 76H226

76S72 76S252 76S362 7BS366 76S368 76S369

STÔCKMANN H. J. 76A216 76A294 76D397 76H164 76WB6

STOCKMEYER R. 76R403 STRINGFELLOWM. W. 76H334 STUHHMANN H. B. 75L315

75M291 75S313 76S21I 76S357 76S358 76S359 76S360

SUAU P. 7BH331 SUCK J. B. 76B306

76B307 76S235S 76V379

SVENSSON E. C. 76S3S6 TAFFUT R. 76B287T TAJIMA K. 75I24I

76192 76T154

TARDIEUA. 7SL315 TARDIF P. 76C40 TASSET F. 76C314

76D75 76T377

TEUCHERTW. 76SI65 TEUTEN W. 76P220 THOMAS M. 76F271T

76T147 7BT176

THORELP. 75M62 76T96

TIMMINS P. A. 75M276 76F16

TIPPEA. 75C152 TOCCHETTI D. 75W223

76C169 76D281 76H334 76K381 76R403

TOMKINSONJ. 76T229 76T374 76T375

TOPLER J. 75R298 78T152

TOURNIER R. 75R23B TOWNSEND M. G. 76H195 TRANQUI 0. 76T147

76T176 76T376

TRAVERSE J. P. 7BA46 TSCHOFFEN J. J. 76G66T TURBAN L. 75T189 UEDAY. 76H188 VALLADEM. 75B05 VETTIERC. 76M112

76M52 VICATJ. 76T147

76T376 VIGNON B. 7BL321 VILLAIN J. 76V260 VILMINOTS. 76V15! VOI RON J. 75B229

76B196 VOLINO F. 7BB318

75H47 75H227 75H245 75S322 75V101

76D94 76V02 76V68

VORDERWISCH P. 76V379 DEVRIÉSA.J. 76P354 WADDINGTON T. C. 76T229

76T374 76T375

WAGEMANS C. 75W244 76A08

76W22I WAGNER V. 75W68

75W223 76S165 76W99

76W171 WAINTAL A. 76H333 WAKABAYASHI N. 76R404 WANCZEK J. P. 76A294

1 WARNER D. D. 76B303 ZEILINGER A. 7GR212 76P220 ZEYEN C. 76M205

f ' WEBSTER P. J. 7BZ32 76M344

g WFILLG. 75A2S9 76Z14T | WLRNICKJ. H. 76M346 75Z1S1 | WHITEJ.W. 75G306 76Z100 £ 75H304 ZIEBECK K. R. A. 7CB105 r 75M276 76C256

i. 75W303 76Z32

' WILL G. 76S235S 76Z104

' WILL G. 76B118 ZIGONE M. 7SB43 WILLIAMS W. G. 76H329

1 WILSONS. 76J335 76W387T

'• WINDSOR C. G. 766129 , WINNACKERA. 76W86

WITZJ. 76J128 WOHLFARTH H.

f

76C205 76L214 76S120 76S204

76W227 76W3B0

DE WOLF B. 76S211 . 5_ WOLFERS P. 7SWI96

76N347 : i 76W382

i . 76W383 76W384

| WOLLNIKH. 75P237 76S219S

76A61 76S367

WOODS A. D. B. 75S322 76S366 76S368

76W216 WORCESTER D. L. 75W279

76S390 76W388 76W3B9

WRIGHT A. F. 75CB6 YELON W. B. 75C152

75J40 76B118 76B301

76C60 76C309

ï ï YOUNG A. P.

76K241 ï ï YOUNG A. P.

76Y03 76YB4

76Y208 ZACCAI G. 76B101 ZARZYCKI J. 76L339 ZEIDLERM. D. 76BI99

76B244 ZEILINGER A. 76S53

146

LIST OF THESES

The experimental work of which was carried out at I.L.L.

76117 G. ICHE, Thèse de Doctorat d'Etat, Grenoble [Février 1976). Description "Stochastique" de ta Désorption. Equation de "Fokker Planck" Quantique.

76P19 J.C. PARLEBAS, Thèse de Doctoral d'Etat, Strasbourg (Février 1976). Effets des Interactions entre Impuretés sur la Structure Electronique et les Propriétés Magnétiques des Métaux Nobles ou de Transition.

76J30 P. JEUCH, Doktorarbeit, Munchen (Feb. 1976). Anbau und Justierung des Konversionselektronen-Spektrometers BILL und Messung von Konversionselektronen nach Neutroneneinfang an 233jh.

76M153 Jûrgen MEYER, Doktorarbeit, Munchen (July 1976). Wechselwirkende Phononen in Kalium.

76G155 G. GÔLTZ, Doktorarbeit, Stuttgart (June 1976). Magnetische Kleînwinkelstreuung von Neutronen an Versetzung ïn verformten Eiseneinkristallen.

76P175 P. PATAUD, Thèse de Doctorat d'Etat, Grenoble (June 1976). La Diffusion des Neutrons de Grande Longueur d'Onde appliquée à l'Apparition du Magnétisme dans les Alliages Métalliques Dé­sordonnés.

76P223 T. PETERLIN-NEUMA1ER, Doktorarbeit. Munchen. Untersuchung von nichtperiodischen Bewegungen in Teîlkristal-tinem Polyàthylen mittels hochauflôsender Neutronenspektro-skopîe.

76L225 F. LIVET, Thèse de Doctorat d'Etat, Grenoble (Oct. 1976). Contribution à l'Etude du Magnétisme des Ailiageî de Métaux •je Transition par la Diffusion des Neutrons.

76R259 R. ROUSSILLE, Thèse de Doctorat d'Etat, Grenoble {Oct. Î976). Etude des Niveaux Excités de Trois Isotopes de Néodyme de Masse Impaire 147,149,15lNd.

76B407 H. BORNER, Doktorarbeit, Munchen (December 1976). Bestimmung des Termschemas von 239u durch hochgenaue Messung von y-Strahlungen nach Einfang thermischer Neutronen.

76G40B M. GRUPP, Doktorarbeit, Heidelberg (December 1976). Defects in CaF2 Following the Thermal Neutron Capture Process 19F{n, y) 2ÛF and Relaxation by Intrinsic Anion Self-Diffusion inCaF9.

CONFERENCES AT I.L.L. IN 1976

Information Meeting on Hydrogen in Metals (organized by T. Springer and W, Just}

Meeting on.Binary Alloys (organized by P. Chieux and A. Guinier)

148

Workshop on "Special Diffraction Methods" (organized by B. Klar and S.A. Mason)

Structure and Dynamics of Liquids with Ionic Interactions (organized by J.R.D, Copley, and J.E. Enderby)

January 1976

February 1976

March 1976

October 1976

E X P E R I M E N T S P E R F O R M E D A T l.L.L. 1976

The following is a list of the experiments performed at l.L.L. from January 1 to October 1 1976 for which répons have been received up to Januaiy 10 1977.

Pleact' refer to the Annex of the Annual Report fer a detailed study of the rcsjlts.

C0LLLGE3

03 01 0C75 Nudeur char go i l i ' . ir i t iution of hnavy PN1 maw region f i i t i on products at vanjble kmc'.ic énergie» (Chain 1331 H. E3j?ur. Z. Alla->ii, H.O.Oemcr.Isg. W. F.ui ic l . C-. F . v : * U c i . 7 . l j ak -B i \n i , G . ^ f l i M t l i . T . T,nmi i teain i l n .Schrader .G.Stc i j t . i H.L.L.)

OJOl 0 / 5 le.ir cbti'«:i' i l i ' i i . b j i i o n rjf heavy P M

nnv , region fusion products at

v . i rabk fcîneiic erwj ic» 'Cnain 13*11

. TV. FjubE,, H. B r jun ,

H C. f3en.ctii,-,g,T Ir.-.k-t3iran,

J. Leuthnîr. H. f . le 'xlci , G.F'af i r j th,

T T4.nai{f."a:rti) H . & h i M l f . S.SlOJCil D.L.I..}

03(l*i 00(56 0 ; i iiîjJueei-ient', in m r - l chans of PN1 shi- .- iwed f 'ssiot protects .

H. M)werk,HT.D. F. r .-yinich,

H.SiipsVcr (Brmirivci/.'eKil P. Decter, B P f i - f te i . IV. V.ZiM't (Gn-f'-çr,)

£ . Munnmd, F Sd iu^ 'e r fCEMGl J-rVBcwquei, H. Schrads. ( I .L.L. I

03 01 016B Spectroscopy of the short lived PN1

fission product! , ; i 6 T e a n d 1 3 1 S n .

J.Biachot, J-P. Bacqu-ït,

E.rvionnsnd. F. Schirsler [CENGI

0 3 G i 0' .^3 apcc i r j scopvc f i h o m o r l ived PN1

fission products 1 4 7 L a and ' 4 7 C e

J. Bîaehcit, i-P. Bocqget,

E.Wonnand, F.Ech-JvsiBi (CENGI B. P-'eiffur IGiessen) H. L a w n , K.Si-tamiseh Uulich)

03 CI 0 ' F.AO Investigation of I ' IC emission S?8 probabil i ty of deiaycij neurons, P n , of individu;]' mic iç i .Thealkt f ina ati ivi i ies m o o b t j i n t d by the Oit is t ic i l - ty .

C. Ristori. J- Cranço.T (CEf.'G) K.D.V.'uen<ch iG'SMCr) M. Asghar '.' L.L.) K .L .K ia i / . , •.'.•. Pudoip:-, H.Onrn (TAiini)

03 Oi OWA Nuclear charge disrr ibutic» of PN1 fir.iioii y roduc i i

G . S i ^ C i i . ^ . K a i - . : . . <• T.vonEgidv ( I . L I . ) l i .VVollnik, G. Fitrrilor, G.Gei î l . K. M-jnïonl««". J- Gtrr.f, R. E\-,;ld. P. Armbiusior [Gioi'-e.-l

03 01 026 Irradiation of pi iatognulsions PN

with fission product]

J . G r t ' f [Gics^enî

G. SiL-gcrt, C. Chauvin {I .L.L. i

05 01 027 BO DeLiyud^ncuirctr, suecirGscopv of Rh precursor; wuh ^He ionization rrianv;".-!

K .L .K ra t / , H O t i m , M. Zendel ' tv\Jr?t J. Cra.TCOn.C. r-.i;-;-ri ICENH K.P.WuMSCh l l i - i - , * .^) M.Asghat (l.L.L.1

03 01 030 Decay proper t to of shnrt l ^ t d C i 03 03 023 and FT) lission pso ' l inH, jpsciidlv :

OjVdlov> of noi j ic tn n t h -iur.:ei K.O.WuEnsth, H . I Î K k î r . H.V.'.iilnir.. J ."Se. .-r l . CI.. .- , : . S. B j les r in i iG i i -wn) G.Siegcrr, E. Ko.d n i f .L .L )

03 01 030R Ma» yields l ion- 2 3 5 u ( n , n , f) a* a

f i inc: ion of kinci'C ensgy an.J i^r.ic charge

H.l'.'oh!(:»tm.'.V L.?-J! H G Cltrc. K.H.Scdm.'H iO j . - r i i iao l t H.SchraJff (I l . L ]

03 01 031 Ft N u d c r c iwga y i , -di M the fission products f rom H* a funct ion of the \ in? i ic energy

r i .G.ClPrc.W. I.sr-r,.

W.lVnfcHaith. h r-*nn,

H.Schraderd L.L.i

03 01 034A Nuclear charge d'srnbu' ion ^r:d

hrfjh r^asicDtoVjt ran r>) Lnr-e-i'jrin

W. Ka l i t - , G S-^r-M H.L.L.) J .Grc i f (G i cu rn j

03 01 0-113 Mass yield rriMsurrmcnt and deteimi' iation cf ; re nvifage er i j r j y distanco o l the d^c.iy chain io rh-ï sttnla end pio>'.ucl

(.Kvei S s j u c i u r t f t £ 0 B I

Dt> huu Phuoc, P Chery (Lvonl Pn.1GiOup. f r . ' V ' l r oup ( l .L .L .1 0. tiif.k -K.,'i>-u'.^i I!.Ft K c i h . l ! . ; - / : ' : iH i I J j l c l .

PN1, P

PN3, P

03 07 031

V.L Alt 'xeiv ILCii-iigrj(J) W.D jv id iCh . J.A.Pir.î ' .on, K.SchrtCfcin&ml. ( I . L L J

fi.F. Casier.. Û .V . ' . c - r , J A.Pi r . i tCf , H. f - ' . . r .er . W. Davidson I i .L l I A . Njmjn-.on IJVJ Nubian!

C o i . eecr.i studies

03 02 00G Nucle. i rsptt l roscapy PN4

P . J w c h H . L . L )

03 02 009 f/leasureiTiLOi of t>c PN2, PN3 1 ^ S m f . 1 . >l ' i'SSm and ftv* 154Smln,c) 1 553m spectra

FI.K.SfriilhOr (Argr-nne)

A.Ncmenson. PN2-Group, P N 3 G r o u p l l . L . L . I

03 02 018 Tho nuclear level structure of PN7, PN3 ' " Y b u n d I M v i , PN4

J . Larysz (Manchester I

03 02 024 X ray; l i o n JOUJI I - K vacinciss PN3 in 23.ÎU atoms ; X-ray cicr-j.es l r«m Th. P i , and U ; 1 f.'rie. f rom 232 T h{n . -> l333 rn .

J.P.Desrlau*. H. L'ocrner, K.Schrcckcnt..-:h I P.Jr-jch. W. Div idson. J.A. Pns;nn (I .U.LJ

03 O i 027 Hiijh prgcsion measurements or PN2 level w id th , level enargips and Auger electrons of atomic shells

K.Schretkenbjc l i I I .L.L.)

03 02 028 High prscis-.on me a su re ment o l PN2 Q values and p r i r - j - y trans-rion

capture prcct is

F.Braumand:,

K.Schreckc/.i.LKh I .L.L.)

03 02 029 M subshell ratios of pure E2 PN2

transitions in tho rare earth region

W.Gellet ly (fvUndiestar)

K .Sch rwko i i b j i h .

R.Casten (I.L.L.)

03 02 030 Level «roc lurp of ? f t 9 C r n PN2, PN3 by neutton capture, gamma-ray measurements

R. Ho t l . T . won Egidy, W. Davidson, K. Schreckonnach, H. Boernar. D-Warnet (Livermore, USA and I.L.L.)

03 02 033 Study of lha levels of 1 9 e P t PN2

wi th particular emphasis on the

excited K = 0 bands

f l .F . Casten,

K.Schrec>.erib.^r. (t.L.L.)

03 02 034 Study of levels and transitions in 1 3 1 0 s : systematicsof l ow ly ing Ni 'won o i ! : ^ ^ - ?r<d fi ju ivemation Of Mi l l ion strenrjih ai r..t,bar

energies.

W. Mjcpf<ji l IManchtfjicrl K.Scnreckenuach. R.F.Casient l L.I..I

Ob'-rvabi l i ty of ? "

roiAfic-m.. (Frttf tal d'f traction

of neutrons)

A.G. Klein. G.I. Op i t (Melhourr

Special S26

Determination of the neutron

tie 'ing energy o l ! J ' X e

Spec i l l

Se tup

B. Foqelbcrg (Nyknping, Sv.eeenl

Determination of concentratio

R. Henkelmann, K. "ue ' le r ,

J.P. Bierwck. P. Met let» (Berl in!

Special

He's -Neui ron G j ' i n i a r î y

fubMium And cac-- j» i

G.I . Craivford, S J. Hal l . J.D. Kcl l ie IGlavjoul fc. Asgtar ( I .L.L.) R.D. icKer.K.Wuir. ict- (Gitresen)

T mec 1 flît'hi m'Xttcncierrêovbtt

R'jcfe: f r o m d e L / ï ' J nruirons

P. Paris (CNRS. Grs;y! H. I'.'fcHn.k. K.Wuen.rh (Gic;>en)

Gamma ray spocfoscnov v.îth the mass separator 0 3 TlS

J.Biachot. J.P. Hnco«.:i. L . ^ w ; J . K - m - , r r E . ' : o > K. YVuensch, E. Koclin iGies^srO B. Fogeiberg (NyliOping, Sweden)

Gamma ray soeci'o-i-opy with PN the mass separator 0"> I IS and LOHENGRIN

J.a-schM.JP.Du-:* :»?! . E. Monnand, F. Schuyler (CENG! K.lr.'ucnsch, B.Ptoi l fei (Giewenl H . U w i n , K.Sistemiîch (Julrcli)

Low energy neutron induced (n. p|. and (n, ot- r t i : t i c n s in neutron deficient nuclides

G. Andetwon IG; ipnotg. SwedfMj M. Asghar ( I .L.L. I A.Emial len ILyonl E.Hagberg, 8 . Jonson. Tuiemnnd-Peiersan fC tHN)

150

Cr.j f l O1- «rvj Ir*. 7OI- . - . e».or: milium aryj heavy nuc'ei

M Asgh.w I! L.LJ P. Gficiy, A . EmiaUen (Lysn l

S i . d v a I l n , ( J - ; i l) In,

COLLEGER

O10I 012A

for fever^l heavy isotopes

M. Nil-vcde Mc.crgnies, C '.Varprrun. 'Moll A J . Oe'uyt iJr . P.O'Hortrft IGont. Beljiurri A . EmKiilcrt (Lyon) M. A:,ghai (I.L.L.)

dcuiërïe J . Lefctwre, fl. Faurei (Li l la l

Chnnoiiç in t eia gall icm

I.. 0O5!O, R. Cones (Parisl J . Copley. W. Ttuchert ( I t . X . l

I 'h ' jnoni in ths Is/ered structure H g l j

G.Ccrnvec. B. PrtfJOl, (.1. Sieskinri (Strasbourg)

Pfronjn di.persion in c^ i ium (ie'.'i-i.des

P Vo-derwiscfi îfJerliiil S. Havtecicr (Mol l G.G Lilniivit? (MorrisiO'vn)

Phorin'-.aooiMlies in T iN I N

VI. Krew. H. f . i l ï . P. Hoadrnfi-rn-i' ISiu ' îgsr, ! A. Ch'intsnsen .Ajrhus) l'.'.U. T f j c h t r t f l .L .L . I

Lattice vibrat ion; in some toyer

crystals ; Measuements on Sb2Te3

H. Burkhard, P. Grosse (A^.hen)

V.Wa.jnei I I . L 1 . I

0yr.2ni.es or ^ ra j so rbed on eraphim

J.P. Coulomb, M. Hitr.fait (Marseille) C. Nbrt . (Pari i l P.Thonj!, B.CrOset ( I .L.L. l

Study of the pbûnon modes of TaSj

K . R A . Ziebeek, 6 . Owner, W.G.Stir l ing I I .LX.J H.School'hotn IMunster)

Qudsii.'l.isltc seal 1er in ç

from PbH and SrCt2

M.M.Dickens l û x i o r d a n d

Har.v;!')

Lattice phonons of AçBr in the premulting rrgimo

W v i n a - i -Û i i îP [P.icJe. b a r i l

04 01 OGS A r t l w - r j n « - e ' f i=e. .n 0*lhr.:fiCrr^)K: KN1O3

A.M.O.iUft i fPaM-. l C . H . f \ i r y . H fcuh.-y 'c. :t.; lt,n. H . C u i u t ( l .L .L . l

04 01 067 Phonon dopersion a*

po l y . j l f u r . i in idc, [ S N ^

L. Pmi<chovius (Karlsiuhe)

04 01 071 Constante *la«mups de !-yS. à l î transition métal-non mcial

R.BruW.t,JM.O.Co*Y (CNRS GrenabîeJ C. Escribe. G. Pansot If.L.L.J

04 Ot 072 Phonon density of slate; in gallium

L. Bosîo, R. Cones (CNRSPsrW J . f . Suck. J.R.D. Copley (I.L.L.)

04 02 0O7A G i i n l Ko lm anomal y in KCP B. Reiser, L .P in l rc l iov iu ! IKarteruhei fl.Comc (Orsay)

04 02 01CC Ptessure dependence of zone

VJ.Ù. Teuc1). H.Wanoc; C

04 02 01 SA Etude dus modes de phonens sur le TUBA

J . Oour-et. A .M. LcveUn. M. Lambert. P.Pcrquet lOnriy) B Dori ici (I.L.L.)

04 02 0 I 9 A 3 AnharniftM'ir prtonons in CvC:

H.Heni iwn !Gif :

B.Prewoi 'Slrasbourg)

04 03 021 Pressuré dependence of pboicin energies in .'Jjph salens

J. Kalos, SthTielzor ISaysu th !

R J . N d n c s . F.R. Thû'nit 'y (Edinburgh!

Lattice dy,un-ic.-.Di KCN

J . D a u b r n (Vunich) W.Ouitt (Re^nshu/g! A . Loidl ( Frni.kfurt) K. Knorr M'ubtngen)

Second orrjer phase int i tsi l in of KTN l^etroc.eetr io J . Coiiti l i ltc. J . l»rfr in. 5. Z.olkiet-.'c,- 'PirisJ

Investigation c l lerroelasiic p!ta« :ranf i i :on in SD5O7I

W. Preiil.C.R.SocWcr fF.-tf» V. IVa-j-ww .'i.t.L J

Elu t i c -d i l l o je scattering in Rbl order prc-.ijre (goniijlcrr.cntary

nieaiurcmEnl)

O. BlairhLc, G. Ernst, G.ûu- t tne i IWienl

Allotropie (m-mens'iic) phaie

trans lor mr . i o ' i and irt$ po ly lype

structure oi cob.ilt

F.Frey. H. Jacodzinski,

VJ.Prandt (MunchcnJ

Temperature dependence of

phnnon excitations in tha

fiist ion conductor SrCl2

M.H. Diekuns. W. H j y e i lOxford)

M.T. Huichirgs (Harwell)

Lattice dynamics of KCN

J. Daubert (Gr.rching) K. Knoti (Mai iz) W. Ou»2 (Regensburg) R .CurMi t i . L .L . )

Sof i phonon and central petite in RaCaF 3

R.Almi i ruc I L L L.) 0 . He -won iS*r_J.y) J . Noue:, M. ROUSWJU (Le Manïl

A n i i o i i o p j : exdidntj-.- .ind orbital effects i t X CoFgvirt the dispersion o ' high energy longitudinal excitons

G.Parisot l l .L.L.) M.T.Hmchings. Ni î .Sa iv3-Mur thy, W J . L . Buyers (Han w i l l

Magnetic C*ci tat io" i in aniifcrtuma^nutiC CoO

D. Ron-saud iC.N.RJS. Grenoolc and I L.L.I V.Wjqner (WurzlwigiinrJ I.L.L.) B.Gcick tWuubuig)

Spin wave dispersion

"» f d Q . 5 F e 0 b

W.G.Stir l ing, K. Ziebrck.

P. Rjd l iakr . ;hna( I .L . I -J

Magnstic in MrtSi

Y . Utiikawa,

M.Kohgi (Tobokul

D.UIocl i lCNPtSGri inonie)

P. Radhokrishna (1,1 )

Dynamic ip<ri correlations of 2dimcnsio<ial Heisennerg A F M : R u 7 M n a 4 . i n d I C D j N D ^ MnCl4

V. Wagner (Wdrzburg

and I.L.L.1 U. Kroy IRegtnsburti) N . Lehtier (Karlsruhe-)

Quasi elastic neutron

scant l ing t rom \ & O H

J.G.Smit. H. Duchs (Bdrlinl

R. Lcclmcr .I.L.L.»

Ouatielauîc scattering f rom GAgl

G. Eckold. K. FunkH tGott in i jenl R.E. Lechner l l .L .L. )

Invest y3t ion of the magnetic excitation spKt run i of ready I D AF C s L n B ^ a i t l CsCoCl3

R. Weber, W .B rd i l i ng (Konsian*) V.Wagner U.L.L.)

Spin *.;wei in f inite ferromagnetic

scattering investigation o t C s N , F 3 ( 2 % M g ! r/.Steioer (Berlin) B .Dornc r f l . L .L . I

Investigation of the hypcrf ine

jp l i t l ing in V3O0 cirtel V4O7

by inelastic neutron scattering

A. Heidennnn l l .L .L. )

K. Kosuge (Kyoto)

C O L L E G E 5

0 5 01 OOSR

altering 04 04 026R Inelastic netilron

f rom an ionic ten

M J . Fair, P.Day (Oxford)

M.T. H u n t i n g s (Harwell)

04 04 023A Spin waves in PdaFfl

A J . Smith, R A.CD>vlev (Edinburgh) W.G.St r i : r .T( ' .L .L . )

i h c c r y n . i l structure of .1 i T c cWofiie

Vi. Jnsv.ig (Frankfurt)

Etude structurale in situ He

l'oxyde Fq .zO

C:rc-!. C i . v j - i i . & r i f - v o n d ,

Weigcl IParis)

SublaTtice ordering in 0' liaions

G. f .Eacor t . N.Cowian IS"cf l i?IJ)

Structu'e of krypton and

ni t icçun layers on gi&nhiie

C f A i r i i , P.ThortH.

B . O - o n i l l .L .L . )

Structure of krypton layers on graphita

C.Mar t i . P.Thorei, B C m » ! C .L .L ) J P . Coulo<r*b IMarteilJo)

Huartg-aralterir.g f rom point . d e f e c t m MgO

N.St i imp t.Vuntr.01

152

H. Jagod/.nski. W. Prandi. F. Frçy (Mûnchenl

Invesligation of aror th i ie ICaAl^Si jOe) 'J', i teution suuer i r iy Structure determination)

H. Jsyodtiniki, K. Knlus (Mùnchen)

1 he phase V J M f o r m a t i o n

in K2SnCCl6

H. JagodzimM, W. Ptuntil,

H. Dovsen (Munchtnl

The phase transfernution in K^SnClô

H. Jagotfcinski.W. Prandi, H. Boysen (Uunchen)

Investigation of me ordering mechanism of intermediate p' j i j iocl j^e ie«:i r>-'<s in ihocourw of itiBannealing process

W. J o m i g , M. Korek.iWB (Franklu ' t )

c'wlccacnieos

C. Rekel H.L.L.I

r i . S : f i M i t h o " i iCUmsiÊt)

Tv.odinxinsion:)! structure D I D gr adsorbed Uye.s on Ijmetiar halides

F. Mi l lot , V . Loihw ISaclay) B.Crosei. P. Thorcl , C .Msr t i i l . L .L . )

Precise neu'ron dif fract ion D9. D10 s îudyof BaTiOo D16

R.Schollmayer, K.F. Fischer ISaarbrucken)

Emdecristailoo'^rihiauctJa D1A

) ' o -y f JeP t«3Of l c r i : re?40«5 K

Weiflel, Gava") (P-oriii

Neutron di f f ract ion topographie D1Q observation of Cu-decorated dislocations anJ tv. in-houndarsi in Si single e r r a i s

H.Tomimitsu (Japan) C.Zoyen II .L.L.I

Study of the A " ^ H and D I B H ^ X crystalline transitions of [he lanlhanufn •îsqu'oxide

P.AIdahert ( l .L.L.) J P. Traverse (Criniilo)

!-l't|h-presMjie pot'-aw di f f ract ion D1A

from KDyPOij 3nd K H j P O ^

N.S.J. Konnedy, » R.J. Nc lmEs'F. i lbb j rgM

Magnetic ptûp?nie< iJ T. invjano.e 01 f l pcrotski ie. Ciudtcs ot ii.-^i tempera lui e

D.Fiuchart (CNEiUGr.ixoWel P. L'Héritier ( I N P O-m^Plel

SOW iri Cr Pd

K.ZiebOck, R. C h a r o n ( l .L.L.) J .G.Booih ISolfoiui

Helical antifei' iorrj.^nt' i isn ( in f J i ? i M n A A l 2 . x l

P J . Webster,

R.M. Mankiksr (S j l lord l

Study of the a rifeir

G. Kr i l i , F.GdUiii.'i i i t ' -ubour j ] )

L.iue method u iJer m^ne t i c field 013 , !

for simultaneous yip"-:vii'n>ns

J.C. Marns-vn !CN' i f : ôrt-noble'

Sit idy of Tie v j r : ; . t>n .- ^ih C

nio'ecular strur'.it 'e of s»i:m: o ig jn ic 50miconduf.io;i i ^ e ' • •"}£ UiWife' complexes of T C O l ict iacyanoaunodmiutr ianel J . Gaultier IBurdcauy) P. Delhaci (CNRS U v i l c ^ x l A. F i l i a l , C. 2c,•;.-> ! ! .L L.!

| C b H 5 F B X O l ^ l ?

A. ,MitSCli!'.r, B R<>:s IS-'^saOitrg!

S;ji;i dc isff v in ferromagnetic çhtoinuim bramioe

P. Kadhakriil ind H.I. L.)

Piero-mjrj.-ieiic ctïcciî J"d spin density in Co F j

P. Radhakrishna H L.L.)

ir.'zatip IMly!.': riff-.' i n 7

W. Kaenïig, M. Zn-j t t r i Zurich) H.G.Smith (Oak R .<•<.,»! P. Fischur IWuiti-.î.no^i] J Sdiwcizer ( I .L.L. I

I iw rna l rrctaircgoeiistv. in ThC05

D. Girard ( I .L.L. I J.Laforest ,

' P. Lemjire iC:.*1-^-G>-:i-c'j!tfl

An investigation i i tta the use Of standards m yoici / . - ' t ion .-inalysis en \Ktin icrut -iPd n". iMi ' fnients of

F.F. Prcem-in. E.H. I . ' j . td .m. V.'.G. Will i mis (Rtii>iP:lord) J.C. Ooro lK -M i -

C o g e n c y in K 2

l , c C l ' j

F.A.Wenr. w o d (H:.t,iiell)

J.B.Foisyrh (Ruthvrf'j j-dl

l iwest i ' j . i i ionsanSH... .S hydrngen bridycs : D i lp-chlorophenyl i dithiophosphinic add

6 . Kri-bs..G. Henkol (Bielufuld) S A . Mason (I .L.L.)

The high pressure structura

of naphthalene

G A , Mackenzie.

G.S.Pav.Sty lEdinLjrgh)

Crvst.il structura of

(C3H/NH3i2MnCl4 at low

temperatures with special

respect to hyrlrooen por t ions

J . Felschc.W. Depmcicr (Konsianz)

lucah îa i ion des fluors en excès

dans la solution solide à i tructuro

fluorine r ^ Y F - i - Y ^ . e T - j d e de la

comws i i i on f^aYF^-SOX- YF3

soil f ^ c , 4 t 2 v 0 , 5 D £ F 2 , ; ? B

L- Pontonnier (CNflJî GfiVioble)

Localisation des fiuots dans la solution solide N a Y F j - Y F 3 ô structure f luorine. (Emdcdc la composition NaYF f l 1 1b° iYF3)

L. Pontonnier ICNRS Grencbla)

E k t i r o n d e n i i i y studies in

calcium UirmateCo |HC30 )2

H. Fuess (Frankturt i

N.Burger ( I .L .L .and Frankfurt I

Study of a phase transition in

N-Niuodimethytamine

Lascombe, Ray Laffoni (Bordeaux)

A .F i l ho l (I.L.L.)

Neutron di f f ract ion f rom

hydrater) clay minerals and

graphitic oxide

D J . Cebula. R R Q n e w t l l ,

R . K . Thomas (Oxford)

J .W. Whit* (I.L.L.)

Neutron dif fract ion f rom O K clay'water systems

D J . Cebula, R. H. OtiewiU, H.K.Thomas (Oxlord l J.W. White (I.L.L.)

Neutron diffraction f rom hydra*-*! clay minerals

D J . Cebula. RJH.O-.tewill. U .K .Thomas (Oxford) J.W.Whit» I I .L .LJ

The spin f lop transi Csr.lr.Cl3 2D2O in s fields, and thecMc.-f i c ldon the one-am

rn- iyncc a m j j j n c t * lonj l o i c w

06 01 023

J . He r rm f i n , W. PijndJ [Mûrcht ; 1}

Satellites in MnSi and FgGc

C.Wilkinson ILomlyn) J.B Forsyth (Ruthurford) M.Ro th (I .L.L.) D. Bloch (CNRS Grenoble)

Study or. the Mx, ( U X 2 l n

system (X ~ S, Se, M = 3d mei&ll

r .Woifers ( I .L .L . and

CNFIS GrcnoSle)

• H.FiMian (CNRS Grenoble!

Ammonia-d^ on graph on

R.K.Thomas, T.D. Trewern (Oxfoid) J.W.White ( l -L.L.)

Molsculsr motions in I N : l iquid crystals

A .J . Lfoductter, FÎ.M R;sh.irc!ion, D.H. Berwor.J.C. FroM !E*e-.et> C. Carl .k-( I .L.L. ar-.l Rutr;crf:>r:i)

N û j l r c n quasi elastic s-n;teun.j Study of ro'at'orisl rfOtfon* ir> the smoct ;c C, H am! VI priants o l tcrcphtnlbis-butyi aniline (TBEA)

F. Valine [ l -L .L . j r .d ?JI.3nipaili«I AJ .O ianoux II.L.L.) H . H F . V U I (Potis)

St-l'-di f us i on nnd uno J O I ion modes in a smactio A l iquid crystal.

A high-resolution 11 evïr on-scattering Study.

A J . Clianoux, A. H d , . ! - ^ . ^ i i .L .L . I H. Hervoi (Paris) F. Vol ino ( I .L .L . and Montpellier)

Phonons dans l'adnmani j

J.O. DiUTvort, R. Fouiet.

J . Lelefivre IL i l le l

•î-tllô

R.A.Cow,loy. P.A. Hi l ton I Edinburgh)

W.G.Sti i l i r t3. R.Sthorm (I.L.L.)

05 02 015A Gp ; i ; moces in a molten salt

G.D; l l i - is 'Cna«k ' i : . -c : ) J.RJ). Copley II.L.L.)

06 02 016R Low momentum tunsfer excitations in sup'^ l luk! hel ium

j.n.o.Or-r.'t.'v.wG.Ei.tii-ia, R. Ghosh, J.S. K.'sflirs (I .L.L.)

54

t f f c ' î s on ng-j lmn ig .n He 4 lilrru

Strj';>.uifll anolysJsof mci ien O J C I at 500%

W. Knol l , P. Cireux [ I .L.L. I S. t is^ i l i r f fg . J.'r. Jûl, J . DuiKjy (Lynn)

ConccntiJtion fluctuations in l iquid Li-Na alloys

H. Huppersbetg (Saarbriickenl

Structure ot l iquid binary alloys Mfiih segr r^ i ion tendency in the s/;i-: in Al-Sn

S. Sieeb (Sfutt3.-<rr) W.Kno l i U.L.L.)

J .E.Enduiby, R.A.Ho< G . W . r ^ i N o n i L c i c ^ i r f I.Taga (Harwell)

Scatter**) iJrt lor vu r t

silicd a: hi^h Q .\jluet

R.N.S-iic' A.C. Wright I Reading)

COLLEGE 7

07 01 026A

•e-lil

Origin of thecocic iv i ty in the Co ï«Jo,Cul5i tucrmcM' l i t compouri'.is, spherical crystal

study

B. Lobullc, C P I M I I M * (Rouen J . Lafoiest 1CNHS Grenoble) R. Lemaire (Grenoble) M. Hot h (I.L.L.)

Aqueous solut ion!

J. tn i le ruy , A . Mov.e, G.VV. NeiJson, A.K.Soper, S.Cummings tLaiccs;*^)

The- structure factor lor

J.C.Dore, G .W. Stanton K e n t !

Ng.j-rnn scattering sludy of

mo'Myl group row i ion in solid

pjra•520Kianiscl9 (PAA1

H. Hervet (Paris)

A J . Oi.inaux. R.E. Lecnner,

f . Volino I i .L .L. I

Stnictuia! study of the

normet. i ! ;u m^'sl transition or K in»T.o l *n KBi by srrall angle scattering

J.F. Jal, J .Dupoy (Lyon) P.Chieux II.L.L.)

Structure factor of j ce ionmi ie

M Zeidlei, H. Fiertagnolli (Karlsruhe)

Nou:rDn scattering in molten Au'Co alloys at small momentum transi er

S.Sreeb (Stuttganl W. Knol l (I.L.L.)

Fe-C melts

S.Slccb, M. Weber IStuItgart)

C m i ; a ! opalescence at short wavelengths

J.L. Rivail (Nancy)

Structure factor of l iquid chloroform

P.O.isu.'. f l . L . ' - f 0 . Lc'Chi, M.O Zeidler (Karlsruhe)

Magnetic oVIuse sc t ' s r i ng

I r o n C?-Gd J-d -c^-.ted^'lo/s

J,G, Booth, ft. Cyw in rH,

J.G.Prince iSalforJ)

Freezing of spir-s in b i n ^ y

alloys

A.P.Mu-ani (I.L.L 1 J.L.TIio,-:nL-e (CNRS Grer.co.e)

Mjgi iei ic dilfus» scattnrng in

Au-Fea l 'oy i

A.P.Myr<ini [I .L.L.)

O.K. Coles (London)

C.fifc---; r.^xk- wdi 'v-.Vg an

varhble -n-iQne:ic anisci :cpy

K. S t ^ i s i ^ i t , F.Soeffg? l.V-jndicnl

Magnetic excitations in

FePt 3

D.RIoch ICNftS G a m b l e ) P. F'.....:ij!.|-J.:n ; i .L.w.i M. Kohgl. Y . l ih ikawa (Atp&nl

Freezing of spins in Pd-Mn alloys

A.P. Murani II.L.L.)

M. Lco' .^nhau?; {Jûlîchî F.Sieglich (Kdln)

C. Bouysïiît, G. Bacquct (TOJIOUSC)

CF In Van Vieck pararragiiars

K. Knorr (rYU.inz) A.P.Morar i I I .L.L.)

K3.id.-i W u I: utrfs in CuA. j .-.'id .--.'..li..! [...;*u i-i-uRVinei

K. Knorr (Maine) A.P.Mdiani II L.L.) K . H J . Busclt^w (E.ndhwet )

155

C7 02 013 07 02 01&A

07 03 011 07 03 CM?

I'v.irs: &Jlii)f> of ccyMrtl lit-Id

t i . VcrOerwisch, H. Oachs (Berlin) S. Hu iec ler IMo l l

Vislprcc i,-»sOtii!itv In C - ; . , T n x . alloys

O.E.I : . rcr:dcr lOxforr)) K . K I L O T (Nt i i i i i }

l/.'yii;li.-.)in.iM ar..jl» sc j rc r ing on 'Julowitions if» Fe sing'o-crystals

A. Scejot. H. Kronmueller (Stuttgart) '3 G o c l l î l i . L . L . )

Sividy of fast neutron irtadiaicd

a l l i u m arsaniun

E.WJ. Mitchel l , R.J. Stewart,

S. Gupia IFtt idina)

Local strain associated wi th

E.W.J Mitchel l . R J . Stewart, R. Ikt ldoe (heading!

"Decomposition o l AISi

G .K f£ io :z i l .L .L .1

CipnipnsJtior in ho mage ni ties

in a phase Cu-AI alloys

J£. Epperson. C. Ruono,

F.r -uonronr (Stutigar.

G . K c s t o n d . L . L J

I nve «ligation of lhe)o r r r tatk in o* j \ i s in ciuanrmrJ and

J.6. Epperson, O-Comar, C. Ruano (Stuttgart 1

G . K o s t c n t l . L . U

Temperature dependence of precipitation in Ni bjsod super-alloys

G. K C Î H . 1 7 i l .L .L. ) R. Millet (Harwell! R J . Stewart, S. McssQto'iK (Reading)

0-ray d l i ret inn o ' mult iple N\ 'R transitions ol Bi_i in L.1T.1O3 single cry j io lsand poMJer» H. Ackermjnn, K. Doorr,

D. Dubbers, F. Fujara, M. Grupp, P. Heitians, A . Koerblein, H J . Stoeckmann (Heidelberg Bhdl .L .L . I

&fj :it •lattice reldnation et B L Î in l iquid 7 L i

H. Ac<Srmjnn, K. Oosrr, D Dutitars. F. Fuj j ra, H. Grupp,

M. G'upp. P. Heitjans, A. Kocrblein, H- .Stoockmann I Heidelberg ,-..vl I L.I..J

07 0C001A

07 06 009

Flir-UK iie.fi nn,r\k-i\ dt tc rmi . io i ian in K / n F ^

H. AcliCrm.:r>n,rC.[Joc<r. P.Dur.v. ' i», F. (-,... f,,, M.Gn.po, P. H«:t|-iis, A . K fa tb l iM i , H J . S:o«Ar.« i« i iH, '«Mbi}tq and I L.L.I

K.P. 'A-i-B/ i fc iarfTi- . f i t K. fle^r.'ir, R. Lt :k« 'wsi .h (Rgn i )

Low tre'-tuency n

R.GeiL-k, C " .Beckc i (Wi>*l«urg) V.Wagner I l .L.L.)

Di f fu '3 jcauc i ing in C o 2 l ' l ' A t ) 2

PJ.l ' . -eoi iu i . R.M.M:.nkikar (So i i o^ ) K.R.A. ZielKck (I.1..LJ

Spinflio SEprteiing at uranium hydride

G.Gi. \ . ! . , A.S: t - /e , i (0" rci-.lng)

MagrL-tic exciut ian» in

Pr-Y s ingk'Civmls

K.A.McE.r-.'n «S-lfordi

Hypcrt i i f- ir.ipructicn in V3O7

K, KOïurjJ t-hpiirtl A,Ktidtfear-t, U.L L.J

Eiergy levais ol nydiogen

G. AMfeld.W. Muenztng, N.Stump (Garehrng)

G. Alafeld, N. Stump, A.tV-uiisri (Garcriing)

Hind» cd d i t fuson of hydieg'.si in r.iunium wi th nitto-jen it"purit>«v

D. Richtpr, T. Springer IJ«>ich)

Investigation of the anonymous terr.peMtuie depenof rice ni* the self-diffusion eonslonl of nydrcgen

sc3tteri.--B.

0 . Richtw, S. MiW-i Uu l kh ) A. Hsï.'iîjnoTi : i.L L.I N. Wn^twy.-.shi iOaK Rldgef

Deirye-Waîlef factor for hvriroqfcn in si>igl* ijryîîatî of

D .K.RO», I.S. Anderson IBirmingham)

156

Opt>c phonorw ir»

V. Lottner, T. Sp'mrjer (Julichl

Loral mods frequencies of

G. Aiefeld, Ci. Stump, A .M iger l (G.jrcriingl

H-0-alumir.a

B.C. Toffeld, A J . Jacohion (Harwell) CJ.Car l i ie (Rutherford a n d f . l . L J

03 02 030

Optical phono M ii

hydrides

D.K. Ross,

S. i f vine (6

.R. Harris.

in irghaml

Interaction eruujies of

deuterium in niobium

G. Bauer. W. ïïchmatï Ui i l icht W.Muerutng I r . ' j rchen)

Self-diffusion <n H 3

M.Seegar, H f.'Cirer (Stuttgart! G. Goeltz, A . Htittumann | l .L.L.)

Localiïed mode frequencies in

V. Lo t tne r .A . Hoim. T.Sprimjcr f jul icl i)

COLLEGE 8

05 01 Cl 'J

0 a 0 ' . Oi-JA E. Duiie. H. fuc is .S .Mason, A.C. Nunes (l L.L.I L Power (Ausnalia)

Chromatin sdur ion scattering

3. Oram. P. Bsudy. D. Vastel (Pjnsl

biictenoplwgi! P\'2

P.M. Franklin. D. Schneider.

K. Ibel II J- L.l

Conformation of ribosomes

H. Stuhrmann, M.H J . Koch [Maim) R.R. Cr.'cfit^n, R. Parfait (Louvam-la-Neuvel

Small-angle scanning studies of

Muscle proiems in solution

J.M. Squire, G. O f er. R.Storr ILon^on)

Ct.L Worcester {H-mv-S)

Determination of theconfoi of oligomers of L-gLuiomia acid in aquecus solution*

OS 0*130* A 02 04 OC-l

A srody o\ t i i f3(S>- \Hi coropie*

B.JaCfJt (I.L.L ) P. Be-iudry. t." tVr.r •»•». M. Grui.b3rg-V..in:.30 iP j ru l

C h r o m n i " sut%ji>ii imu' l nç le neutron jcnt'c-riTj . .i (.'."•JÙ n c d c o i l surrounds a proifi 'r. ÛfJA co>e

P. Baudy.S.Br^m. D Vdîiol . J .Lepau l t , A . K K Ï . S IPJIM'S)

Study of t R N A t R N A tyniheia». comple* toim. i i ign

J P. Ebel I S I M J - ' . - ' I T B b q u t i , Destcn ti'sr.s} B .Jacro t .G.Z icco i I I .L . l . J

Investigation on tHNA's

amina;iryl-;RNA iynihei j ' jcs ttnil

their compta»,

J.P. Ebci, R. Gicjje.

J.C.Tineirv !Sti • : ' . O I . J I

G. ZaccBi. B .J j c rc : i l .L .L.1

Permeability of ?'pr«rhti.d lo wdtei

J. Haas. B.-Mc-n: {!.•_!. ) T . K o h n . B . H o h n . P. Kunt7?e -Fowl»

c .M. B r a r f l w r v . j p B.r'v-Wm, B.f i .Carprnter (PortsmoL'th)

A . Miller. OJ.S H^ r . v - , S.W.White (Si.M fi.L G-encble) P .T immmHI .L .L . I

The structure of spfiar'cai virus

by neutron small .m*^? scattering

J . W i t ! (SuaOJOiirq) c .O:u. - ; . - . i C - - . - : , - . : - . ; .L.f B.Jacrot ILL .L . l

Calcified turkey t inrton

S.W.White. A -MM^r ,

DJ.S. lE J M.BX.Grenob is l

P.T immins l l .L .L . )

The sKucruie nf ;r,p COJr-ss\ stroma

G.F.El l io t t , A.E.Wor lHa' , J. Gnodfellow (Oxfo id !

Neutron inelosiic scattering h\l f rom hyrfr.-iicd coiUr,t'T

A. h*i!'.'r f » f „ « - f l

P. T imnins. G.T. Jsnfein. R .GhOfhd.L .L . I

Conforma. ,on dependant Imv-

hon egg-vrfiite iywi /v 'ne

P.Jotlês,.I.Bcrthou

H.O.Batr . in ik t ' i jn i . r ien. i .n f I.L.L.] R.DianouxO.L.L . I

1

08 05 oaw Oft 0-1

Old ocs OOoA

j . M . G i l l i ; fLobvaiii-!,vrJeitve) E J { V i n c i U i n d n r j ]

RliotlOfMîn in rietar<|°m micellBS D U

H.H, CMwrrie ITENG anrl I.L.L.) C.S.inirit lV:i!efrur.chc) M Chî.bic' (CE'.MG)

fmall-ar-.^ly scoUcring siudlas o l 0 1 1 «IWCDUS dispersions ul purple menil-rj-ies f n m Halobacterium h; loi.ûiim

D.L. Worcmll-i (Harwell)

Molecular dynamics of IN10 phospholipid bilayer membranes

M.H.F.Wilfcim. H.D.f.Nddif ldo/f (London) G.C.St-riina. A J. Di .nyys, C. r i i = « : i l .L .L. )

S'.'ucTuieof insect flight D11

C D . Raiger (Oxford) D.L.Wc-cciter fHsr-.-wiit A. MiHei ie.M.6.0.GrËnoblf i )

N i - i i l ro i dif fract ion h^ D11

m i i n m a i w i erythrocyte membrane»

J. IUr.{laH,S.Gilinour, A . V.jdriy (EdlnburgM J. lort jet H.L.L.1 O X . W q r c r < i « { H a r i w H |

03 06 003 St'rt jnureof photosynthctic 011A momL-ra res

D.M.Sariler (Orisioll D.L. vVorcesiar (Haiivel!)

08 0G 000 Pic'intinary invfS(ig.rt»ons on O l 1A iRNA'surrcJnnacylt^N'A synthetases and th^ir coop te* !*y neutron small ûrtjlu icaiieripig

J.P. f hoi. R. Gi»j«, D. Moral , J. Witz (Strasbourg) B .J jc ro t I l .L.L.) J.P.Waller IParis)

COLLEGES

09 01 0O5 09 01 0(13 03 0? (MCA 09 0 2 O I 6

Mst8:y r structuras of polyuihylone

JS. King, G. SunimarfiekJ,

H.UMrruii I Michigan]

Conformation of polymer 011A

chain in erystj ' i ine state

D.M. Sadler, A . Keller (Bristol)

Confiaura;ions of c'ioin molecules D11A ir. poiymn.- nV slures

Conformat ional Lh.-> n rnolL-cules D1L in polymer molts and in c ry - in l ine

pot y met s

E.W. F.wher, M. S t a t i n (Mair.*)

Ccnliguialioris ul chain molecules 0 1 1 , O I L in polymer melts and in ctysMll't-e polymers

E.W. Fischer, M. Dertunnwior, P. HerchenrocUer, M. Si<*mm (Mainzl

09 0 1 0 ^ 3 0 9 0 1 00 7

The time dependence of iho conformation o f an elungated polymer chain

G. Alien. A . •/•tcur.nazh.c, R.W. Richards, G.Wei iMLondon) T.Spiingur (Julicl i l

Conformation of polymers in

the bulk and in A m i e n s

G. Al len, A . Maconnachic.

R.W. Richards (London!

n.S'nplr-ion ( .Vj i icrci iB: i

09 04 013B/C Quasi clastic scatter D9 04 012B by rubbers and gsls

09 05 024 09 07 030

G. Allan. A . Vaconmchie (LonJonl R.E. Ghosh, J S . Hicgins ( l .L .L. I

J.B.Huyter I l .L .L. } G.C. St.rling Ittuttie.-lordl

Hydrogen rwnds in imidazole IN 10

H.Sii i lor, J. Pdlsuios-Gomei IJuich)

Ring puv-kering t i t r a t i on INS inconrfensed statu

J. Lflîcombe, M. Pr-snard, H. Jobic, J.C. U>sii-gjes îi lnrdcdux)

Study of molecular mo i icn IN'.O, !N5

in n-AIkPnecrys;alsby T-> in j of

quasictasiic reutrr;n sf- i t ic îng

E.W. F.scher, H. fcvwn (.V.-iiiti)

D. Rich 1er (Julien)

Determination of the spectral IN4 density of phonons in pure

A. MaJn), X. GerbauK, C. Birti lBI (NûflCyl

Nruuunscatier inft f rom M IN IB

fcorU'M systems

T.C. WsSdiiintort, K.Rrierlev(burh.irr.) J.Tomkinsun (I.L.L.)

Ne i i l :< j^d i l f i jC i :ùnof D IG dimtrsDnd micolles

J.V.'.Whii-îd.L.L.J RK. Thomas. J.R.M. Cockivnn [ O i t t T d 1

J.W.White (I .L.L.)

R.K. Thomas, J.R.M. C-otfclwin ( O x l m

58

M.Prsgw.B.A Ic 'ek i Uuiich)

P'.r.-ions in S H a C- i . x B r x 1N2. 1N3

V.V.'jgncr i l .L L. H'.J ï i - j r t lwrg) I.R. J.ihn irutun-jsnt

C. l l . Perry (M P.I. Grenohlo

and Boston) W. Bjuhofer, L. Genzol (Stuttgart) . . . r . .ôokoiOlf (Boiic.n)

Internal rotation of t i i * IN5

nu tny l groups in d ;n'.cthylacoiYlene (high tempera lure ptiase)

S.Sunjk . (Salfordl H. CiufrCs. J.L. Bi ibes (Montpellier)

Hindered rotations in systems IN4 sucli os CH3C3, I C H g t j CX2 and ICH3)3CX

T.C.Waddmgton, K. Brierly (Durham)

Experiment " H on N i " II410

F. f o u i Houx, A. Renauprw \CNRS Villeurbanne) R.Siockmeyer '.Jitlich)

1 09 03 0C3 l>»bveV.'.ii:i*r bc :or of bcnrer.e molecules adsorbs^ on a Raney-

' Nickel catdlyst

f A. Renouptu?. -F. Fouil loux (CNRS Villeurbanne) R.Stockmeyer IJunch)

1 ', 09 Of- 0C4 09 Of 0O-7 03 C6 OCO

Hydrogen adsoibt'd on 1 plat inum

T.C.Waddii i3t=n. J . Howard (Ourr-am)

09 ce QUÏ

09 ce OO<:A

CJ.Wr ipht (Hsr/wi l l A . Rc.ioupic*. F. FouiHous !ViliPLrbonr.e)

Intorcalstion compound s-t

(Giaphitfl-potaîîium-hydrogen)

T .D.Trcwern, I. M a r l a w ,

R.K. Thomas (0.<ford)

J.W. While ( l .L.L.)

Diffusion in l y o n - ^ i i ;

J.W. White, R.M. Parry (Oxford)

Lyoiropic liriuid crystals

J.W.While, R.K. Thomas,

n .M.Pa' rv (0*<crd l

Ammonia physisorbed on grophon

Molecular diffusion in

intercalates

8.£.F.Fender {Oxford! C Rieke! ILL. ' - . ) G.C.Stirl ing iRotrwrfora)

Quasielaslic broirtening duo to

J J . Tu:-< -C /..-.••.• , -R K. 1 he*"!-:. J.W. '•'.-.. a. D Ci'!.u<a iùm-r.ji R.H.Ottewi l l I t l r .siui l

t 'ynj iT i iCiaf iWCr .!r> J : 0 ~ .

m clays

M H O . Hayes, D.K H•};<., J . I . luck (Hirn:in..ri.T"i n .H .Thonu i . J .W V.h te, D. Ccbula (OxforJ) r l .H.Ot tcwi i l (Dni tot l

1/drcular dynamic! 01 hOK.idiyr.e (tunneling in

hexjdiynt!*

J.W.While, R . K . T l . T i M i (Oxford) M.Ratlcy (Austciiia)

Dynamics cf poly.tf ptyleoej

J -W.Whi lP .A .H.O- .c i s l l . L .L . ) R.K. Thomas (Oxlor^)

M. Bailey (Australia)

Intercalation comp.-unriv l l

(grophi-e t r i i looro.vc io ie i

R.K.Thomas,J.W.White,

J.ft.M. Cockbain (Oxford)

Inelastic neutron c-cigy loss

srattcrino f rom som; pi<>|:num

onvr-pfcomp'-i-*.«;••.: I :c ; : ' i Mthe-

transition m?;,,' oni r ic complexes

T.C.W. idd ingtm,

J . Howard IQv.rh.irn)

Ltijtstianai î l j ies ; n

dimethylaceiyleJiD

B. AlpfelCl IJJl.tr:)

K. T«111 (Helsinki)

iM. Adams, J.V..Thotf3S tAhfe.-vit.vyihl

EXPERIMENTS WHICH ARE NOT ALLOCATED TO A

COLLEGE"

Test * Poiyelectrolyiic Ire*-. !V-o;.r D11

o f D N A

R.C.Obcrtti i jr ( M . I I I . Î )

01 002 Bra.» di l f racf.an i i " : : î t i o r r . c t r y D18

U .Bon : * , W.Bau !p ic« , • W.Gracff IDo r i nunu l

H R j j c h . G , B a . i u c ' < , H. Kaiser, V«'.Sch..id'pr. A. lVi t f ing (Vîenr.ai

Neutron depolari j . i t inn and INZ(b) n b y a _ _ _-ngie

crystal near T c

A.C.Nunes (I .L.L.I

F.Socffçie ( l .L .L . a:)* Mûnchsn)

K.Sner i iadi (Murelias)

The study o( rcspoi ' " ' ^' a g old •utface twri'ûr s^hïon ii<s-on detector

M . A ^ h a r . C . G u ô î t I I .L.L.) M, Mantel, P Perrin [C.E.N.Gryr,?r>i,i| Cir .ud, M../itr, na.r...?

Si^narbwux IC.t N. ^-.cLiy)

1^Q

A C K N O W L E D G E M E N T S

The Institut Lauc-Langevin wishes to thank ail contributors to the compilation of the

ANNUAL REPORT 197G

I 4 The tnterrul ivork has bcw don*! by the offices

ol the Scientific Sécrétai y and the Administrative Service and \he rçporl edited by D.H.Giay

Ci dation et mise en page Roger David - Graphiste • Grenoble

printed in France by çircnoble dessins offset

Photographs

Both photographs on page 8 Art Technique • Grenoble Second phoiogmpli on page 50 • R. Roussille

Al l othur photographs- Alsihum t.d.f.

^ —