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Laboratory for Nuclear and Plasma Physics

Research topics, 2015

Nuclear Reactions and Structure

Hyperfine Interaction and Intermetallic Phases

Local Structures and Clusters

Nuclear Instruments and Methods

Accelerator Physics

Hydrogen storage

Ecology and Sustainable Development

Biophysics

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Laboratory for Nuclear and Plasma Physics – 011

Annual Report No. 20, 2015 3

CONTENTS

Nuclear Reactions and Structure 5

Hyperfine Interactions and Intermetallic Phases 13

Local Structures and Cluster 21

Nuclear Instruments and Methods 29

Accelerator Physics 33

Hydrogen storage 37

Ecology and Sustainable Development 45

Biophysics 59Scientific stuff 64

Office personnel 65

Domestic collaboration 66

International collaboration 68

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I

NUCLEAR REACTIONS

AND STRUCTURE

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6 Annual Report No. 20, 2015

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PROBING COLLECTIVITY IN Zn ISOTOPES WITH ONE PARTICLE OR HOLE

OUTSIDE THE N=40 SUBSHELL CLOSURE

I. C ̆ eliković1,2, A. Dijon1, E. Clément1, G. de France1, P. Van Isacker 1, J. Ljungvall3, A. Dewald4,

C. Fransen

4

, G. Georgiev

3

, A. Görgen

5

, A. Gottardo

6

, M. Hackstein

4

, T. W. Hagen

5

, C.Louchart7, P. Napiorkowski8, A. Obertelli7, F. Recchia9, W. Rother 4, S. Siem5, B. Sulignano7, P.Ujić1,2, J. J. Valiente-Dobón6, and M. Zielińska7

1Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM -CNRS/IN2P3, Boulevard H. Becquerel, 14076Caen, France

2 Institute of Nuclear Sciences ”Vinča”, University of Belgrade, 11000 Belgrade, Serbia 3CSNSM, CNRS/IN2P3, 91400 Orsay, France

4 Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany5 Department of Physics, University of Oslo, 0316 Oslo, Norway

6 LNL (INFN), Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy7 CEA Saclay, IRFU, SPhN, 91191 Gif-sur-Yvette, France

8 Heavy Ion Laboratory, University of Warsaw, PL-02-097 Warsaw, Poland9 Dipartimentito di Fisica dell’ Universita and INFN, I -35131 Padova, Italy

Abstract

The nuclear structure of the odd-mass 69Zn and 71Zn isotopes, with one hole or one particle outside

the N = 40 subshell closure, has been investigated by measuring the lifetime of excited states usingthe recoil distance Doppler-shift method. The nuclei of interest were produced in a deep-inelastic

reaction in inverse kinematics with a 238U beam impinging on a 70Zn target. Single-particle and

collective states were found to coexist at low energy in 69Zn and 71Zn.

Physical Review C 91 (2015) 044311

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NEW PROTON EMITTERS IN THE VICINITY OF 100Sn

I. Čeliković1,2, M. Lewitowicz1, G. de France1, R. Gernhäuser 3, R. Krücken4, S. Nishimura5, H.Sakurai6, H. Baba5, B. Blank 7, A. Blazhev8, P. Boutachkov9, F. Browne10, P. Doornenbal5, T.

Faestermann3, Y. Fang11, J. Giovinazzo7, N. Goel9, M. Gorska9, S. Ilieva12, T. Isobe5, A.

Jungclaus

13

, G. D. Kim

14

, Y.-K. Kim

14

, I. Kojouharov

9

, N. Kurz

9

, G. Lorusso

5

, D. Lubos

3

, K.Moschner 8, I. Nishizuka15, J. Park 4, Z. Patel16, M. Rajabali4, S. Rice16, H. Schaffner 9, L.Sinclair 17, P. A. Söderström5, K. Steiger 3, T. Sumikama15, Z. Wang4, H. Watanabe18, J. Wu19,

and Z. Xu6

1 GANIL, CEA/DSM-CNRS/IN2P3, 14076 Caen, France2 Institute of Nuclear Sciences ”Vinča”, University of Belgrade, Belgrade, Serbia

3 Physik Department E12 Technische Universität München D-85748 Garching, Germany4 TRIUMF Accelerating Science for Canada Vancouver BC, V6T 2A3, Canada

5 RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198, Japan6 University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033, Japan

7 CEN Bordeaux-Gradignan Le Haut-Vigneau F-33175 Gradignan Cedex, France8 Institute of Nuclear Physics University of Cologne D-50937 K¨oln, Germany

9 GSI Helmholtzzentrum für Schwerionenforschung GmbH D-64291 Darmstadt, Germany10 University of Brighton Brighton BN2 4GJ United Kingdom

11 Osaka University, Osaka, Japan12 Technische Universität Darmstadt D-64289 Darmstadt, Germany

13 Instituto de Estructura de la Materia IEM-CSIC E-28006 Madrid, Spain14 Rare Isotope Science Project Institute for Basic Science Daejeon 305-811, Republic of Korea

15 Department of Physics Faculty of Science Tohoku University Sendai 980-0845, Japan16 Department of Physics University of Surrey Guildford GU2 7XH, United Kingdom

17 University of York York YO10 5DD, United Kingdom18 Beihang University Beijing 100191, China

19 Department of Physics Peking University Beijing 100871, China

Abstract

In this contribution we report on the identification of new proton emitters in the vicinity of 100Sn.

The nuclei of interest were produced at the BigRIPS separator of the RIKEN Nishina Center by

fragmentation of a 345 MeV/nucleon 124Xe52+ beam impinging on a 4 mm Be target. The positionsof the most neutron deficient isotopes are compared with the predictions of the proton drip-line

deduced from various mass models.

From the production yield of nuclei along successive Tz lines, a deficit in the number of detected

93Ag and 89Rh has been observed. Sub-microseconds half-lives have been deduced from their time

of flight as well as from the systematics in neighbouring nuclei. The obtained half-lives are

compared with some calculations.

It is proven that we have crossed the proton drip-line in the vicinity of 100Sn. Systematics of the

deduced half-lives, or estimated limits, for odd-Z nuclei with N=Z-1, show stabilizing effect of theZ=50 shell closure.

The Fifth International Conference on Proton-emitting Nuclei, PROCON2015, Lanzhou

China, 6th to 10th July, 2015.

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PRODUCTION CROSS SECTION MEASUREMENT AND IDENTIFICATION OF NEW

ISOTOPES IN THE VICINITY OF 100Sn

I. Čeliković1,2, M. Lewitowicz1, R. Gernhäuser 3, R. Krücken4, S. Nishimura5, H. Sakurai6, H.Baba5, B. Blank 7, A. Blazhev8, P. Boutachkov9, F. Browne10, G. de France1, P. Doornenbal5, T.


Jungclaus13, G. D. Kim14, Y.-K. Kim14, I. Kojouharov9, N. Kurz9, G. Lorusso5, D. Lubos3, K.

Moschner 8, I. Nishizuka15, J. Park 4, Z. Patel16, M. Rajabali4, S. Rice16, H. Schaffner 9, L.Sinclair 17, P. A. Söderström5, K. Steiger 3, T. Sumikama15, Z. Wang4, H. Watanabe18, J. Wu19,

and Z. Xu6




7 CEN Bordeaux-Gradignan Le Haut-Vigneau F-33175 Gradignan Cedex, France8

Institute of Nuclear Physics University of Cologne D-50937 K¨oln, Germany9 GSI Helmholtzzentrum für Schwerionenforschung GmbH D-64291 Darmstadt, Germany10 University of Brighton Brighton BN2 4GJ United Kingdom






Abstract

In this contribution we report on the measured production cross sections of neutron deficient

isotopes around 100Sn, produced at BigRIPS fragment separator at RIKEN Nishina Center, by

fragmentation of a 345 MeV/nucleon 124Xe beam impinging on a 4 mm Be target. Production crosssections, deduced for nuclei with transmission larger than 1% are compared with several

fragmentation experiments and EPAX empirical cross section formulae. In the estimation of the

experimental production cross sections, a special attention was paid to contributions from

secondary reactions in the primary target. Production cross sections measured in experiments withdifferent target thicknesses corrected for the contributions of secondary reactions show a good

overall agreement between different experiments. In the the same experiment, several new

isotopes: 96In, 94Cd, 92Ag, 90Pd have been identified. The observation of new isotopes is confronted

with the proton drip-lines predicted by various mass models. Based on the systematics of the production yields of 93Ag and neighbouring nuclei it was demonstrated that 93Ag is a new proton

emitter with a half-life comparable to the time of flight through the BigRIPS fragment separator.

The estimated lifetime of 93Ag is compared to predictions of simple model of the proton emissionusing various mass models.

The 12th International Conference on Nucleus-Nucleus Collisions (NN2015), June 21th

through June 26th, 2015, Catania, Italy.

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MAPPING THE PROTON DRIP LINE IN THE VICINITY OF 100Sn:

IDENTIFICATION OF NEW ISOTOPES AND PROTON EMITTERS

I. Čeliković1,2, M. Lewitowicz1, R. Gernhäuser 3, R. Krücken4, S. Nishimura5, H. Sakurai6, H.Baba5, B. Blank 7, A. Blazhev8, P. Boutachkov9, F. Browne10, G. de France1, P. Doornenbal5, T.


Jungclaus13, G. D. Kim14, Y.-K. Kim14, I. Kojouharov9, N. Kurz9, G. Lorusso5, D. Lubos3, K.Moschner 8, I. Nishizuka15, J. Park 4, Z. Patel16, M. Rajabali4, S. Rice16, H. Schaffner 9, L.

Sinclair 17, P. A. Söderström5, K. Steiger 3, T. Sumikama15, Z. Wang4, H. Watanabe18, J. Wu19,and Z. Xu6




7 CEN Bordeaux-Gradignan Le Haut-Vigneau F-33175 Gradignan Cedex, France8 Institute of Nuclear Physics University of Cologne D-50937 K¨oln, Germany

9 GSI Helmholtzzentrum für Schwerionenforschung GmbH D-64291 Darmstadt, Germany10 University of Brighton Brighton BN2 4GJ United Kingdom






Abstract

Neutron deficient nuclei around 100Sn were produced, in recent experiment performed at BigRIPS

separator at RIKEN Nishina Center, by fragmentation of a 345 MeV/nucleon 124Xe52+ beam

impinging on a 4 mm Be target. The experimental production cross sections are deduced for nucleiwith transmission larger than 5% and corrected for the contributions of secondary reactions in

target. Production cross sections shows a good overall agreement between different fragmentation

experiments and EPAX empirical cross section formulae. Several new isotopes: 96In, 94Cd, 92Ag,90Pd have been identified. The results are compared with the predictions of the proton drip-linededuced from various mass models. It is shown that the drip-line has been crossed for odd-Z

isotopes. Based on the systematics of production yield of 93Ag, 89Rh and neighbouring nuclei, a

deficit in observed number of 93Ag and 89Rh has been observed. From the time of flights and the

systematics in neighbouring nuclei, it was estimated that 93Ag and 89Rh are proton emitters with ahalf-lives comparable to the time of flight through the BigRIPS fragment separator. The lower

limit of the half life of 97In was deduced as well. The obtained half-lives are compared with

predictions of simple model of proton emission using a proton separation energy calculated byvarious mass models. The proton separation energies Sp of 93Ag and 89Rh are extracted from the

deduced half-lives, using the same model. Systematics of the deduced half-lives or the estimated

limits of half-lives, for odd-Z nuclei along Tz, show stabilising effect of the Z=50 shell closure.

XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland, September 6-13, 2015.

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LIFETIME MEASURMENTS OF EXCITED STATES IN NEUTRON-RICH FISSION

FRAGMENTS

T.W. Hagen1, L. Grente2, A. Gorgen1, M.-D. Salsac2, W. Korten2, F. Farget3, C. Louchart2, B.Jacquot3, T. Braunroth4, B. Bruyneel2, I. Celikovic3, E. Clement3, G. de France3, O. Delaune3, A.

Dewald4, A. Dijon3, M. Hackstein4, J. Litzinger 4, J. Ljungvall5, C. Michelagnoli6, D.R. Napoli6,

A. Navin3, F. Recchia6, M. Rejmund3, W. Rother 4, E. Sahin6, S. Siem1, B. Sulignano2, Ch.Theisen2, J.J. Valiente-Dobon6

1 Department of Physics, University of Oslo, Norway2 IRFU, Service de Physique Nuclaire, CEA Saclay, France

3Grand Acclrateur National dIons Lourds (GANIL), Caen, France4 Institut fur Kernphysik, Universitat zu Koln, Germany

5CSNSM, IN2P3, Orsay, France6 Laboratori Nazionali di Legnaro, INFN, Italy

Abstract

Lifetimes of short-lived excited states in a wide range of neutron-rich fission fragments weremeasured using the recoil distance Doppler shift (RDDS) technique, which was applied in

combination with fusion-fission reactions in inverse kinematics for the first time. The fission

fragments were identified in mass, charge, and atomic number event by event using the VAMOSmagnetic spectrometer at GANIL. Gamma rays originating from the fission fragments were

measured with the EXOGAM array of Ge Clover detectors around the target position. A degrader

foil was placed at variable distances from the target to slow the fission fragments and induce achange in the Doppler shift of the rays, allowing the application of the RDDS method. Details of

the experimental technique will be discussed and preliminary results for lifetimes in odd-mass

yttrium isotopes will be presented.

XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland, September 6-13, 2015

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IIHYPERFINE INTERACTIONS AND

INTERMETALLIC PHASES

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EVOLUTION OF THE LOCAL STRUCTURE AT Hf SITES IN SiHfOC UPONCERAMIZATION OF A HAFNIUM-ALKOXIDE-MODIFIED

POLYSILSESQUIOXANE: A PERTURBED ANGULAR CORRELATION STUDY

1Ana B. Umićević, 1Božidar Đ. Cekić, 1Jelena N. Belošević-Čavor,1 Vasil J. Koteski, 2Benjamin

Papendorf ,

2

Ralf Riedel and

2

Emanuel Ionescu1 Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia

2 Techische Universität Darmstadt, Institut für Materialwissenschaft, Jovanka-Bontschits-Strasse 2, D-64287

Darmstadt, Germany

Abstract

The evolution of the environment of Hf sites in a hafnium-alkoxide-modified polysilsesquioxane

upon polymer-to-ceramic transformation was investigated via the perturbed angular correlation(PAC) method. The results of the PAC measurements on samples thermally treated at temperatures

from 400 to 1300 ºC indicate that Hf is surrounded only by oxygen at all studied temperatures.This finding is in agreement with the evolution pathway of polymer-derived SiHfOC ceramics,

which were reported to be generated as single-phase amorphous materials upon pyrolysis ofalkoxide-modified polysiloxanes and subsequently to phase separate and crystallize towards

HfO2/SiOC nanocomposites. Thus, the results presented here support our previous statement that

there is a thermodynamic control on the phase separation and crystallization behavior of Si-M-O-C (M = metal) ceramics (Ionescu et al. 96;2013:1899-1903), which in the case of Hf leads to the

precipitation and crystallization of hafnia nanoparticles within a SiOC matrix.

Journal of the European Ceramic Society, Vol. 35, No. 1 (2015) pp. 29-35.

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LOCAL STRUCTURE STUDY OF Fe DOPANTS IN Ni-DEFICIT Ni3Al ALLOYS

1V.N. Ivanovski, 1A. Umićević , 1J. Belošević-Čavor , 2,aH. Lei, 2,bL. Li, 1B. Cekić, 1V. Koteskiand 2C. Petrovic

1 Laboratory of Nuclear and Plasma Physics, University of Belgrade, Vinca Institute of Nuclear Sciences, P.O. Box

522, 11001 Belgrade, Serbia2 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY,

11973, USAa Present address: Department of Physics, Renmin University of China, Beijing 100872, China

b Permanent address: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of

Science, Hefei 230031, China

Abstract

The local electronic and magnetic structure, hyperfine interactions, and phase composition of

polycrystalline Ni-deficient Ni3- xFe xAl ( x = 0.18 and 0.36) were investigated by means of57Fe

Mössbauer spectroscopy. The samples were characterized by X-ray diffraction and magnetizationmeasurements. The ab initio calculations performed with the projector augmented wave methodand the calculations of the energies of iron point defects were done to elucidate the electronic

structure and site preference of Fe doped Ni3Al. The value of calculated electric field gradient

tensor Vzz = 1.6 1021 Vm-2 matches well with the results of Mössbauer spectroscopy and indicatesthat the Fe atoms occupy Ni sites.

Journal of Alloys and Compounds, Vol. 651 (2015) pp. 705-711.

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HYPERFINE INTERACTIONS IN SUPERCONDUCTING KFe2Se2

I. Madjarevic, 1 V. Koteski, 1 V. Ivanovski, 1 Č. Petrović 2 1 Laboratory of Nuclear and Plasma Physics, University of Belgrade, Vinča Institute of Nuclear Sciences, 11001

Belgrade, Serbia,2 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New

York 11973, USA

Abstract

The discovery of high-Tc superconductivity in iron-based chalcogenides AyFe1.6+xSe2 (A=K,

Rb, Cs and Tl) raised much attention because of its unusual physical properties. The Tc of KyFe2-xSe2 has been reported to be about 31 K, with two coexisting tetragonal space groups: one

superconducting (I4/mmm) and the other insulating (I4/m) phase which exhibits antiferromagnetic

and Fe-vacancy ordering (Tn ~ 559K). We measured the hyperfine fields at the Fe sites in KFe2Se2using the Mössbauer spectroscopy to compare them with “ab initio” calculations (Wien2k, VASP)of the superconducting and insulating phase. Investigation of this puzzling coexistence of

superconductivity and magnetism is considered to be crucial to understand not only this type of

superconductors but maybe even cuprates.

14th Young Researcher’s Conference “ Materials science and engineering ” Belgrade, 2015 Book of abstracts, p27

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AB INITIO STUDIES OF THE STRUCTURAL, ELASTIC, ELECTRONIC AND

THERMAL PROPERTIES OF NITI2 INTERMETALLIC

D. Toprek , J. Belosević-Čavor, V. Koteski

VINCA Institute of Nuclear Sciences, Laboratory for Nuclear and Plasma Physics, Belgrade University, P.O Box

522, 11000 Belgrade, Serbia

Abstract

First principles calculations were performed in the framework of the density functional theory

(DFT) using the Full Potential – Linear Augment Plane Wave method (FP – LAPW) within thegeneralized gradient approximation (GGA) to predict the structural, electronic, elastic and thermal

properties of NiTi2 intermetallic compound. By using the Wien2k all-electron code, calculations

of the ground state and electronic properties such as lattice constants, bulk modulus, presure

derivative of bulk modulus, total energies and density of states were also included. The elastic

constants and mechanical properties such as Poisson’s ratio, Young’s modulus and shear modulusare estimated from the calculated elastic constants of the single crystal. Through the quasi-

harmonic Debye model, the preasure and temperature dependences of the linear expansion

coefficient, bulk modulus and heat capacity have been investigated. Finally, the Debye temperature

has been estimated from the average sound velocity according to the predicted polycrystal bulk

properties and from the single crystal elastic constants.

Journal of Physics and Chemistry of Solids (2015) Vol 85 pp. 197-205

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Valentin N. Ivanovski

INVESTIGATION OF THE STRUCTURE AND HYPERFINE INTERACTIONS IN THE

INTERMETALLIC γ′– Ni3Al PHASE DOPED WITH HAFNIUM AND IRON

Doctoral Dissertation

Belgrade, 2015

Abstract

The dissertation addresses the local crystal structure and hyperfine interactions of hafniumor iron doped polycrystalline intermatallic γ′– Ni3Al alloys.

The local structure, magnetic and electrical properties of γ′– Ni3Al compounds doped withHf atoms or Fe atoms were investigated by the X ray diffraction, magnetization, time differential

perturbed angular correlation spectroscopy and Mössbauer – effect spectroscopy. The last twoexperimental methods provided insight into hyperfine interactions of Hf – and Fe – nucleus. Thiswas complemented by the calculations of the energy of the defects, as well as with ab initio

calculations of structural and hyperfine interactions parameters.The main goal of the experimental and theoretical investigations of the interme tallic γ′–

Ni3Al phase doped with Hf or Fe atoms was to determine the site preference of dopant atoms in

the γ′– Ni3Al matrix, as well as their influence on the host lattice.The X – ray diffraction measurements of the Hf doped Ni3Al samples revealed the presence

of the cubic γ′ phase (usually denoted by L12) and its two tetragonal distortions: D022 and L60. Therefinement of XRD data showed the dominant presence of the cubic L12 phase in the Hf – Ni3Alsamples, with the minority presence of the two tetragonal phases. The measurements of thehyperfine interactions of the 181Та– probe in the 0.2, 0.5 and 5 at.% Hf – Ni3Al alloys (181Та– nucleus is the daughter – nucleus of the 181Hf – parent nucleus) were done in the temperature range78 K to 1230 K. The measured hyperfine parameters values were assigned to the various Hf atom

sites in the different crystal structures (cubic and tetragonal) present in the Ni3Al alloys. The presence of 181Та– signal constant in time is ascribed to Hf atoms at the Al sites in dominant L1 2 phase. For all investigated alloys, the lower value of the spin independent electric quadrupole

frequency was ascribed to the electric quadrupole interaction of the Hf nuclei substituting on theAl sites in the tetragonal D022 phase in the Hf – Ni3Al alloys. The higher value of the spinindependent electric quadrupole frequency corresponded to the electric quadrupole interactions of

the Hf nuclei substituting on the Al sites in the tetragonal L60 phase in the Hf – Ni3Al alloys.The ab initio calculations of electronic and structural properties and hyperfine parameters

of the 181Ta ion probe in the Hf – Ni3Al alloys, performed using the full potential augmented planewave plus local – orbital method as implemented in the WIEN2k code, correctly reproduce theexperimental results. The DFT (density functional theory) calculations of point defect energieswere done by using the Vienna ab initio simulation package VASP. The ab initio calculations

enable discussion on the structural and electronic properties of the Ni3Al polycrystalline alloys.

The joint experimental and theoretical investigations enabled us to identify the observed

hyperfine interactions and showed that hafnium additions prefer aluminum sites in Ni3Al.

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The structural and magnetic characterizations of the Fe doped γ′– Ni3Al samples were done by the X – ray diffraction and magnetization measurements. The local electronic and magneticstructure, the hyperfine interactions of the 57Fe – probes, as well as the phase composition of the Ni2.82Fe0.18Al and Ni2.64Fe0.36Al alloys were investigated by means of the Mössbauer – effectspectroscopy. The ab initio calculations performed with the projector augmented wave method

and the calculations of the energies of iron point defects were done to elucidate the electronicstructure, the hyperfine interactions and site preference of Fe doped Ni –deficit γ′– Ni3Al. The valueof calculated electric field gradient tensor Vzz = 1.6 1021 Vm-2 matches well with the results of

Mössbauer spectroscopy and indicates weak preference of iron dopant atoms for Ni sites.

Keywords: Ni3Al, hyperfine interactions, Mössbauer spectroscopy, PAC spectroscopy, site

preference

Scientific field: physics

Field of scientific specialization: physics of nuclei

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III

LOCAL STRUCTURES AND CLUSTERS

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SITE PREFERENCE AND LATTICE RELAXATION AROUND 4d AND 5d

REFRACTORY ELEMENTS IN Ni3Al

1A. Umićević , 2,3H.-E. Mahnke, 1J. Belošević-Čavor , 1B. Cekić, 2G. Schumacher, 1I. Madjarevicand 1V. Koteski

1 Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, Belgrade 11001, Serbia2 Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany

3 Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

Abstract

X-ray absorption spectroscopy is employed to investigate site preference and lattice relaxationaround Mo, Ru, Hf, W and Re dopants in Ni3Al. The site occupation preference and the measured

distances between the refractory elements as dopants and the nearest host atoms are compared with

the results of ab initio calculations within the density functional theory. Combined experimentaland theoretical results indicate that Mo, Hf, W and Re atoms reside on the Al sublattice in Ni 3Al,while Ru atoms occupy the Ni sublattice. A more pronounced lattice relaxation was detected in

the case of Hf and Ru doping, with a strong outward relaxation of the nearest Ni and Al atoms.

Accepted for publication in Journal of Synchrotron Radiation, Vol. 23 (2016).

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XAFS AND XPS ANALYSIS OF Zn0.98Fe0.02Te0.91Se0.09 SEMICONDUCTOR

I. Radisavljevića, J.Trigueiro b, N. Bundaleski b, M. Medića, N. Romčevićc, O.M.N.D. Teodoro b, N. Ivanovića

aUniversity of Belgrade –Vinča Institute of Nuclear Sciences P.O. Box 522, 11001 Belgrade, Serbia

bUniversidade Nova de Lisboa – Faculdade de Ciências e Tecnologia,Quinta da Torre 2829 – 516 Caparica, Portugal

cUniversity of Belgrade – Institute of Physics, Pregrevica 118, 11000 Belgrade, Serbia

Abstract

Local structures and electronic properties of II – VI quaternary Zn0.98Fe0.02Te0.91Se0.09 mixed crystalare studied by X – ray absorption fine structure (XAFS) while the surface composition and itsoxidation in air are studied by X – ray photoelectron spectroscopy (XPS). That way the surface

stability and its modification with respect to the bulk are elucidated. The effects of surfaceoxidation on rearrangement and segregation of constituent atomic species at the surface are

revealed and possible mechanisms of oxygen adsorption are discussed.

Figure: Normalized Fe K – edge XANES spectrum. A zoom over the pre – edge region together withthe decomposition of the pre – edge peak using two Lorentzian functions (L1 and L2) are shown asinset.

Journal of Alloys and Compounds 632 (2015) 17 – 22.

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COMPREHENSIVE STUDIES OF STRUCTURAL, ELECTRONIC AND MAGNETIC

PROPERTIES OF Zn0.95Co0.05O NANOPOWDERS

I. Radisavljevića,*, N. Novakovića, B. Matovića, N. Paunović b, M. Medića, N Bundaleskia,c,V. Andrića, O. M.N.D. Teodoroc

aUniversity of Belgrade –Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia bUniversity of Belgrade – Institute of Physics, Pregrevica 118, 11000 Belgrade, Serbia

cUniversidade Nova de Lisboa – Faculdade de Ciências e Tecnologia, Quinta da Torre 2829 – 516 Caparica, Portugal

Abstract

X – ray absorption (XANES, EXAFS, XMCD) and photoelectron (XPS) spectroscopic techniqueswere employed to study local structural, electronic and magnetic properties of Zn0.95Co0.05O

nanopowders. The substitutional Co2+ ions are incorporated in ZnO lattice at regular Zn sites and

the sample is characterized by high structural order There was no sign of ferromagnetic ordering

of Co magnetic moments and the sample is in paramagnetic state at all temperatures down to 5 K.The possible connection of the structural defects with the absence of ferromagnetism is discussed

on the basis of theoretical calculations of the O K – edge absorption spectra.

Materials Research Bulletin 74 (2016) 78 – 84.

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ELECTRONIC ASPECTS OF FORMATION AND PROPERTIES OF LOCAL

STRUCTURES AROUND Mn IN Cd1 – xMnxTe1 – ySey

I. Radisavljević1, N. Novaković1, N. Romčević2, M. Mitrić1, B. Kuzmanović1, S. Bojanić3, N. Ivanović1

1University of Belgrade –Vinča Institute of Nuclear Sciences, Belgrade, Serbia2University of Belgrade – Institute of Physics, Belgrade, Serbia

3Universidad Politécnica de Madrid, Madrid, Spain

Abstract

Local electronic and structural features around Mn in Cd1 – xMnxTe0.97Se0.03 (x=0.02; 0.05; 0.1)

were studied by means of X – ray Absorption Fine Structure (XAFS) techniques. Manganese ions,with an average valence 2+, are found to be well incorporated into the host CdTe lattice, with clear

preference for Te atoms as the first neighbors. However, Mn and Te are found to form twoessentially different types of bonds, one short, strong and directional (zinc blende MnTe – like

bond), and three much longer, predominantly ionic in nature (NiAs MnTe – like bonds), therebydistorting the tetrahedral coordination around Mn. The origin of peculiar Mn – Te bonds distributionand details of their nature and strength are further elaborated by employing the first principleelectronic structure calculations. That way a thorough insight in impact of the Mn – Te bond lengthvariation on the electronic structure of the compound is obtained. The relations established

between the local structures and electronic properties offer a reliable procedure for detailedanalysis of the structural and electronic consequences of the 3d – transition metals (TM)incorporation in II – VI semiconductor host. Clear distinction between various influences makes the procedure easily adoptable also to the studies of TM impurities in other semiconductors.

Materials Chemistry and Physics, 167 (2015) 236 – 245.

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INFLUENCE OF Cr AND Ni DOPING ON PbTe LOCAL STRUCTURAL PROPERTIES

I. Radisavljević1, N. Novaković1, H. – E. Mahnke2, N. Romčević3, M. Slankamenac4, D. Sekulić4, N. Ivanović1

1University of Belgrade –Vinča Institute of Nuclear Sciences, Belgrade, Serbia 2 Helmholtz – Zentrum Berlin für Materialien und Energie, Berlin, Germany

3University of Belgrade – Institute of Physics, Belgrade, Serbia4University of Novi Sad – Faculty of Technical Sciences, Novi Sad, Serbia

Abstract

Structural aspects of Cr and Ni incorporation into the PbTe lattice are studied by means of

Extended X – ray Absorption Fine Structure (EXAFS). EXAFS measurements enabled to get exactinformation on Pb and Te local structural features and their thermal evolution. The obtained resultsalso revealed that by distorting their local environment, impurity atoms (Cr, Ni) add to high

inherent disorder already present in the host PbTe. Larger anharmonicity of the Pb – Te bond andlarger atomic thermal parameters observed in PbTe(Cr, Ni) could be of interest forthermoelectronics applications since they are both expected to reduce the thermal conductivity.

Figure: Experimental PbTe(Ni) EXAFS spectra taken at Te K – and Pb LIII – edge (full circles) withthe corresponding fits (line) in k – space (a, b) and r – space (c, d). Fitting ranges are denoted bywindows.

Journal of Materials Science: Materials in Electronics 26 (2015) 10020 – 10026.

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IV

NUCLEAR INSTRUMENTS

AND METHODS

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COINCIDENCE SUMMING CORRECTIONS FOR POINT AND VOLUME 152Eu

SOURCES

D. Novković, M. Đurašević, A. Kandić, I. Vukanac, B. Šešlak, Z. Milošević

Institute of Nuclear Sciences “VINČA”, Laboratory for Nuclear and Plasma Physics, University of Belgrade, PB 522, 11001 Belgrade, Serbia

Abstract

In this article, the X-ray and gamma-ray coincidence summing effect in 152Eu is studied.

Coincidence summing corrections and peak and total efficiencies of point and volume sourceswere determined using the direct matrices multiplication (DMM) method. The theoretically

evaluated peak count rates were found to be in good agreement with the experimentally obtained

values. Validation was performed by comparing the calculated efficiency curves and the

corresponding correction factors with the results obtained using GESPECOR 4.2 software.

0 200 400 600 800 1000 1200 1400

1

2

3

4

5

6

7

8

Am-241

Cd-109

Cs-137

Mn-54

Co-60

Totaltop

eakefficiencyratio

Energy [keV]

Fig. Total to peak efficiency ratio for set of standard point sources: Blue triangle – experimentallydetermined ratio for point sources; Red line – linear fit.

Applied Radiation and Isotopes (2016) Vol 107 pp. 138-144

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APPLICATION OF THE DIRECT MATRICES MULTIPLICATION METHOD IN

GAMMA RAY SPECTROMETRY

M. M. Đurašević1, A. B. Kandić1, I. S. Vukanac1, B. Ž. Šešlak 1, Z. A. Milošević1 and B. B. Lončar 2

1 Institute of Nuclear Sciences “Vinča”, Laboratory for Nuclear and Plasma Physics, University of Belgrade, Belgrade, Serbia

2 Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

Abstract

The Direct Matrices Multiplication (DMM) method was developed by D. Novković as theoreticalmodel for coincidence summing of X-and gamma rays of radionuclides with complex decays

schemes. This method enables:

- identification of all possible decay paths and decay paths outcomes,- calculation of particular path outcome, probabilities and corresponding energy deposited

in the detector,- determination of theoretical expressions for count rates of single and summing peaks as

well as for total count rate, where the unknown quantities are the total and peak detectionefficiencies.

This method can be applied to the point sources and for small source-to-detector distances. It was

successfully applied to the decay of 139Ce, 57Co, 133Ba, and 75Se. The DMM method was tested onthe equivalence with other methods for calculation of coincidence summing corrections by G.

Kanisch, T. Vidmar and O. Sima and a good agreement with the GESPRECOR program was

confirmed for point sources of 133Ba, 134Cs and, 152Eu.

In the case of the volume sources, calculations of coincidence summing corrections, peak and totalefficiencies are more complex than for point sources. Laboratory for Nuclear and Plasma Physics

participated in the intercomparison, organized by the Gamma-ray Spectrometry working group ofthe International Committee for Radionuclide Metrology (ICRM). Volume sources filled byradioactive solution (152Eu, 134Cs) and with different absorbers have been considered. Results

obtained by DMM method showed satisfactory agreement with the mean values.

The third European Nuclear Physics Conference (EuNPC2015), Groningen, The

Netherlands, 31 August – 4 September, 2015, pp. 120

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VACCELERATOR PHYSICS

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STUDY OF ACCEPTANCE AND TRANSMISSION EFFICIENCY

OF SEPARATED SECTOR CYCLOTRON

X. Li1, D. Toprek

2, Y. Yuan1, Y. He1

1 Institute of Modern Physics, Chinese Academy of Sciences, Nanchang Road 509, P.O.31, Lanzhou,730000, People Republic of China

2VINCA Institute of Nuclear Sciences, Belgrade University,

Laboratory for Nuclear and Plasma Physics,

P.O. Box 522, 11000 Belgrade, Republic of Serbia

Abstract

In this paper is presented the study of the transversal and longitudinal acceptance and transmission

efficiency in the injection, acceleration and extraction systems in the Separated Sector Cyclotron(SSC) of Heavy Ion Research Facility (HIRFL) in Lanzhou, Chine. The study of SSC acceptance

are done for 2383+ with energy 9.7 / and for 7010+ with energy 5.62 / under thetheoretical isochronous and real magnetic field distribution. From the simulation results it can be

seen that the transmission efficiency and acceptances of SSC can be improved by redesign the

curvature of MSI3 deflector or by shim the magnet in MSI3 deflector region to change thedistribution of inner magnetic field.

Key words: emmitance, acceptance, transmission efficiency, separated sector cyclotron

Nuclear Technology & Radiation Protection, Vol. XXX, No. 1 March (2015) p.18 -22.

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VIHYDROGEN STORAGE

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HYDROGEN DIFFUSION IN MgH2 DOPED WITH Ti, Mn

AND Fe

V.Koteski, J.Belošević-Čavor, K. Batalović, J. Radaković, A.Umićević

Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia

Abstract

Incorporation of suitable dopants in MgH2 is widely investigated as the way of improving

hydrogen storage characteristics of this material. The catalytic role of transition metal dopants onhydrogen desorption from MgH2 is very promising, but further attention is required in order to

optimize the experimental methods and design materials with desired properties. In this paper we

investigate the role of Ti, Fe, and Mn on the transport properties of hydrogen in MgH2, which are

marked as limiting factor in the effort to lower the hydrogen desorption temperature. Taking intoaccount the lattice relaxation around the impurities, we consider a number of different diffusion

paths in the pure and doped system. Using PAW DFT calculations in combination with the NEB

method, we demonstrate that the diffusion of the most relevant positively charged hydrogenvacancy and negatively charged interstitial hydrogen atom is locally hindered by the presence of

the impurity atoms.

RSC Advances, Vol. 35 (2015) pp. 34894-34899.

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Bilateral Project between the Republic of Serbia and the Republic of Portugal for the period

2015-2016

Title: Efficiency improvement of hydrogen production and storage processes - experimental and

theoretical aspects

PROJECT COORDINATOR Republic of Serbia Dr Katarina Batalović, Institute of NuclearSciences »Vinca«

PROJECT COORDINATOR Republic of Portugal Dr Carmen Mireya Rangel Archila,

LNEG, UPCH-Unidade de Pilhas de Combustível e Hidrogénio

Hydrogen as a fuel becomes increasingly attractive concept due to the ongoing effort to make

larger use of the renewable energies in everyday life. To be able to develop hydrogen-poweredsystems for everyday use, the improvements in energy efficiency, response time and safety of

hydrogen production and storage are imperative. Prototypes of hydrogen stand-alone system,

based on the integrated functions of electrolytic hydrogen production, storage and compression in

only one device, with higher efficiency than a classical electrolyser, are already being developed

[1]. Investigation in the field of photocatalytic hydrogen production combined with adequate

hydrogen storage would further reduce number of conversion steps and can be expected to increase

efficiency of such devices. Proposed project will deal with both fundamental and practical aspects

of the 2-in-1 devices for hydrogen production and storage. Based on the experience of Dr. Carmen

Rangel [1], the criteria needed for such system to integrate photocatalytic hydrogen production

and storage will be considered. The work on improvements in some of the standard photocatalyticmaterials such as TiO2 (which is the subject of investigation in ongoing project), will be continued

while the group of potential photocatalysts will be expanded to include some new, cheap materials

with high potential for photocatalytic water splitting, such as MoS2. Ongoing investigation of the

metal-hydride storage (Laves phases) will be broadened to investigate the chemical hydrides based

on AlH3, which can achieve very high storage capacities. The fundamental understanding of

semiconductor properties, photocatalytic activity and hydrogen storage properties for all

investigated materials will be gained through ab initio calculation of their electronic structure (e.g.

band gap position and value, position of dopant states, formation energy), which will be used to

both guide experimental work, and explain experimental results on atomic level

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INFLUENCE OF Ta AND Nb ON THE HYDROGEN ABSORPTION KINETICS IN Zr-

BASED ALLOYS

D. Conić1, A.Gradišek 2, J.Radaković1, M.Iordoc3, M.Mirković4, M.Čebela4, K.Batalović1

1 Laboratory for Nuclear and Plasma Physics,VINČA Institute of Nuclear Sciences,University of Belgrade, POB 522, 11001 Belgrade, Serbia

2 Jožef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia 3 National Institute for Research and Development in Electrical Engineering, INCDIE ICPE-Advanced Researches,

Bucharest, Romania 4 Laboratory for Material Science, VINČA Institute of Nuclear Sciences, University of Belgrade,

POB 522, 11001 Belgrade, Serbia

Abstract

The kinetics of hydrogen absorption in Zr alloys containing Nb and Ta admixtures (10 wt%Nb, 12

wt%Ta and 10 wt%Nb&12 wt%Ta) is addressed. Hydrogen absorption is measured in the

temperature range 400-700°C at hydrogen pressure 1 bar using the volumetric method, and a

kinetic analysis is performed to determine the mechanisms and rates of hydrogen absorption. To

get further insight into hydrogen diffusivity in zirconium hydride, 1H NMR spectroscopy is used

to provide the activation energies for proton jumping in the studied samples. The tantalum is found

to dominantly influence the surface reactivity, while niobium influences large decrease of the

activation energy for hydrogen diffusion in the bulk of zirconium hydride. This behavior is linked

to the information on the structure of the alloys obtained by XRD.

International Journal of Hydrogen Energy 40(16), p. 5677-5682, 2015.

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DENSITY FUNCTIONAL THEORY GUIDE TO STRUCTURE AND

THERMODYNAMICS OF METAL HYDRIDES - CASE STUDY OF (Ti, Zr, Hf)Ni

INTERMETALLIC COMPOUNDS

K.Batalović, J.Radaković, V.Koteski, M.Savić

1 Laboratory for Nuclear and Plasma Physics,VINČA Institute of Nuclear Sciences,University of Belgrade, POB 522, 11001 Belgrade, Serbia

Abstract

Thermodynamics of hydride formation is one of the key properties of metal-hydrogen system and

determines its applicability. Therefore, numerous studies are focused on the use of first-principles

calculations as the predictive tool when investigating the stability of the hydrides. In this paper we

use density functional theory to address two-step process of hydride formation in the MNi (M =Ti, Zr, Hf). Through systematic study of experimentally verified and hypothetical hydride phases,

we examine the influence of crystal structure and intermetallic composition on electronic structure,

stability and bonding of the hydrides. The unique properties and advantages of γ-phase hydrideshaving orthorhombic crystal structure (space group Cmcm) for near-ambient hydrogen storage

applications are pointed out, as well as the importance of further investigation of the crystal

structure of the β-phase hydrides. Calculated enthalpies of hydride formation/decomposition anddesorption temperatures show good agreement with the wide range of experimental data taken

from literature, demonstrating predictive power of the used approach for addressing structure-

property relationship and giving complete overview of the important representatives of AB class

of intermetallic compounds.

International Journal of Hydrogen Energy 40(38), p. 13029-13038, 2015

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DFT INVESTIGATIONS ON AlH3 POLIMORPHS – ELECTRONIC STRUCTUREGUIDE TO THE HYDROGEN STORAGE APPLICATIONS

M.Savić, J.Radaković and K.Batalović

Laboratory for nuclear and plasma physics

Vinca Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade

University of Belgrade, Serbia

Abstract

Air pollution due to the use of the fosil fuels in traffic and industry is one of the main problemsthat modern civilization face nowadays. The need for environmental friendly- and sustainableenergy solutions lead many experts to predict that the world economy in the following decadeswill try to free the dependence on fossil fuels and will be increasingly reliant on hydrogen . One ofthe main unsolved problems for the wide use of hydrogen energy is finding the safe and

technologically and economically feasible method of hydrogen storage. Hence, material-basedhydrogen storage is the subject of numerous ongoing researches. The ideal storage material should be safe, non-toxic, and inexpensive, and contain at least 6.4 wt% of hydrogen. One compound withall these characteristics is aluminium hydride. AlH3 has very large hydrogen content (10,1 wt%)and crystallizes in several polymorphic modification, some of them being α-alane(R¯3c), α’-alane,β-alane(Fd-3m), δ-alane, ε-alane, θ-alane, and γ-alane(Pnnm). All of this polymorphs aremetastable at room temperature, and very sensitive to the environmental conditions. Therefore, inorder to design Al-based material for room-temperature hydrogen storage, the knowledge of thestability of all hydride phases and effects of impurities and modifications on the properties ofinterest is necessary. In our work we investigate the properties of tree aluminium hydride polymorphs, α-alane, β-alane and γ-alane.The electronic structure and stability of the aluminum

hydride phases is addressed using density functional theory (DFT) based calculations. The bandstructure calculations are performed using a Full Potential (Linearized) Augmented Plane-Waves plus local orbitals (FP (L)APW + lo) method as implemented in WIEN2k program package. The

crystal structure of all studied compounds is fully optimized with respect to unit cell parameters

and atomic positions. The influence of crystal structure on the stability of aluminum hydrides isaddresed. Further, the electronic structure, the bulk moduls and charge transfer based on the

Bader’s AIM theory of hydrides are studied. Comparing to the starting metal-aluminum, we followthe influence of hydride formation and crystal structure change on the electronic structuremodifications. The investigation of the stability of defects and impurities in the aluminum hydride

phases is aimed toward understanding the role of potential dopants in stabilization of aluminum

hydride phases.

mESC-IS 2015 International Symposium on Materials for Energy Storage and Conversion

September 2015. Ankara, Turkey, The Book of abstracts p. 48

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THEORETICAL STUDY ON STRUCTURE AND STABILITY OF α, β AND γ – ALANEAS PROMISSING MATERIAL FOR HYDROGEN STORAGE

M.Savić, J.Radaković and K.Batalović

Laboratory for nuclear and plasma physics,

Vinca Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade

University of Belgrade, Serbia

Abstract

Air pollution due to the use of the fossil fuels in traffic and industry is one of the main problemsthat modern civilization faces nowadays. To overcome this problem, it is necessary to increase

usage of renewable energy sources. Hydrogen is considered to be the fuel of the future. It is readily

available as a component of water which covers 70 % of our planet, has no harmful emissions, it

is efficient, and the most important-renewable. The problem for wide use of hydrogen energy isits storage. Hydrogen is held in the form of compressed fluid, and over time it partly evaporates.

Investigations are aimed to find a way to make hydrogen bound to some suitable material – forexample by absorbtion in that material. The ideal storage material should be safe, non-toxic,

inexpensive, and to contain at least 6.4 wt% of hydrogen. One compound with all these

characteristics is aluminum hydride (AlH3) which has at least seven crystalline phases with

different physical properties and with large hydrogen content (10.1 wt%). Al is commonlyavailable and can be recycled; also that is why AlH3 is considered as a promising hydrogen storage

material. In our work, quantum mechanical method based on density functional theory (DFT) is

used to examine structural, electronic and thermodynamical properties of various AlH3 phases: α,β, and γ-AlH3. Calculations are performed in program package Wien2k (using FP LAPW+lo

method). The electronic exchange-correlation interactions are treated within approximation ofPerdew-Burke-Ernzerhof (PBE). The crystal structures of studied hydrides, electronic structure as

well as charge transfer based on the Bader's theory of hydrides is discussed. In order to accuratlycalculate band gap, modified Becke-Johnson (mBJ) exchange potential is used. This allows

calculations of band gaps with an accuracy similar to GW calculations. In our investigation we

have attempt to clarify the structural, electronic and thermodynamics properties of AlH3 by first

principle calculations. These results will enhence future studies in order to determine how AlH3 may be used as a hydrogen storage material.

14th Young Researcher’s Conference “ Materials science and engineering ” Belgrade, 2015 Book of abstracts, p30

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VIIECOLOGY

AND

SUSTAINABLE DEVELOPMENT

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NATIONAL INDOOR RADON SURVEY PROGRAMME IN SERBIA

V. Udovičić1, D. Maletić1, M. Eremić Savković2, G. Pantelić3, P. Ujić3, I. Čeliković3,S. Forkapić4, D. Nikezić5, V. Marković5, V. Arsić6, J. Ilić6

1 Institute of Physics, University of Belgrade, Belgrade, Serbia2 Serbian Radiation Protection and Nuclear Safety Agency, Belgrade, Serbia

3Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia 4 Faculty of Science, University of Novi Sad, Novi Sad, Serbia

5 Faculty of Science, University of Kragujevac, Kragujevac, Serbia6 Serbian Institute of Occupational Health "Dr Dragomir Karajović", Belgrade, Serbia

Abstract

Radon contribution to the overall public exposure is the greatest and represents the most importantsource of ionizing radiation among those that are of natural origin. The large number of the

countries in the world pays special attention to the radon problem and the most of them have

established national radon programmes. The establishing and implementation of an effective radonaction plan, aimed to protect the public against indoor radon exposures in Serbia started in 2014.

This action plan requires input from many national agencies, institutions and other stakeholders,

also include the national, regional and local organizations responsible for public health andradiation protection. At the beginning, design and realization of the first national indoor radon

survey are of the crucial importance. The proposed design is presented in this work.

XXVIII Simpozijum DZZSCG Vršac, 30. septembar - 2. oktobar 2015. godine, ISBN 978-86-7306-135-1. pp 173-180

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SEASONAL VARIATIONS OF INDOOR RADON CONCENTRATIONS IN SELECTED

RURAL REGIONS OF SERBIA

I. Čeliković, P. Ujić and Z. S. Žunić

"Vinča" Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia

Abstract

Radon and its progenies has been recognized as the second leading cause of lung cancer after

cigarette smoking. Therefore, it is of the utmost importance to investigate radon in homes andschools and to identify with a high precision radon prone areas. It is thus necessary to cover a lot

of measurements locations and in order to obtain average annual indoor radon concentrations,

several measurements (at least two) should be performed for each measurement locations. Since

detailed survey is very time consuming and expensive, the aim of this contribution is to investigateseasonal variations of indoor radon concentrations in order to conclude to which extent a reliableestimation of annual indoor radon concentration can be obtained by applying seasonal corrections

to indoor radon concentration measured in only one season.Indoor radon concentrations were measured using CR-39 detectors that were deployed mainly in

bedrooms and living-room of dwellings in rural parts of R. of Serbia. For each exposure periods,

seasonal correction factors have been calculated and used to estimate relative uncertainty between

single radon measurements corrected by seasonal factors and measured annual radonconcentrations. It is estimated for which exposure period, a seasonally corrected indoor radon

concentration will provide the most reliable estimation of annual indoor radon concentration. It is

further investigated whether it is possible to apply seasonal factors, obtained from dwellings in

one type to dwellings with another type of underlying bedrock.

XXVIII Simpozijum DZZSCG Vršac, 30. septembar - 2. oktobar 2015. godine, ISBN 978-86-7306-135-1. pp 199-206.

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CONTENT OF 137CS AND 40K IN WOOD ASH

B. Šešlak , P. Ujić, I. Vukanac, A. Kandić, M. Đurašević, I. Čeliković, Z. Milošević

Institute of Nuclear Sciences “Vinča”, Laboratory for Nuclear and Plasma Physics, University of Belgrade, POB 522, 11000 Belgrade, Serbia

Abstract

A growing number of countries increase usage of biofuel. One of the combustion products of biofuel is wood ash often used as a fertilizer in agriculture. Wood combustion multiple increasesthe concentration of 137Cs in wood ash, and its long-term usage can increase the level of 137Cs at

localities where wood ash is applied. Furthermore, due to its chemical properties 137Cs moves easily

through the environment and thus easily enters in the food chain. Having in mind, that after the

Chernobyl accident, special attention is paid to monitoring of the levels of 137Cs in the environment,it is very important to determine the level of 137Cs in wood ash.

For the purposes of this study the concentrations of 137Cs in wood ashes from different kinds of

wood and from different localities in Serbia was determined. The concentration of 40K is also

measured due to its similar physical and chemical properties with 137Cs. This is of great importancein the areas with higher caesium concentration, because the potassium indirectly prevents the

absorption of 137Cs in plants. Obtained intervals for radioactivity concentration were (1.2 ÷ 1010)

Bq/kg and (1160 ÷ 4720) Bq/kg for 137Cs and 40K, respectively.

Estimated share of renewable energy in total consumption in 2011

ECOLOGICA (2015) Vol 80 pp. 605-608

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DETERMINATION OF MUTUAL RATIOS FOR SPECIFIC ACTIVITY IN COAL,

SLAG AND FLY – ASH SAMPLES FROM “KOLUBARA” POWER PLANT

A. Kandić1, B. Šešlak 1, M. Đurašević1, M. Erić2, I. Vukanac1, Z. Milošević1 and Z. Marković2

1 Laboratory for Nuclear and Plasma Physics2 Laboratory of Thermal Engineering and Energy

Institute of Nuclear Sciences “Vinča”, University of Belgrade Belgrade, Serbia

Abstract

Coal as the fossil fuel contains naturally occurring radionuclides and belongs to NORM (Naturally

Occurring Radioactive Materials). On the other hand, slag and fly-ash belong to TENORM(Technically Enhanced Naturally Occurring Radioactive Material), and if they are released into

the environment an increase and/or redistribution of natural radionuclide content can occur.

For the purposes of this study, six sets of samples (18 in total) of “Kolubara” coal, slag and fly-ash were collected during the periodical emission tests in May 2012 th at steam boilers K3 and K4

of TPP “Kolubara”, Serbia. Coal, slag and fly-ash samples were prepared for analysis (milled, dried, sieved and weighed) by

appropriate standard methods. Prepared samples were placed in 125 mL PVC cylindrical boxes,weighted and sealed with natural wax. Sealed samples were measured with a semiconductor HPGe

spectrometer (37 % relative efficiency) after the radioactive equilibrium was reached. The obtained

values of specific activity for coal ( Ac), slag ( As) and fly - ash ( Af ) do not differ significantly

compared to the values available in the literature.Analysis of determined mutual ratios As/ Ac and Af / Ac are consistent, taking into account

uncertainties of activity concentrations, with values of approximately 2 and 4, for K3, and 1.5 and

4, for K4. Discrepancies were noted only for 40K (both steam boilers) of As/ Ac. Results indicatethat further investigation with more samples should be undertaken, and also correlation between

radiological and proximate analysis should be determined.

10th SYMPOSIUM OF THE CROATIAN RADIATION PROTECTION ASSOCIATION

with international participation, Šibenik, Croatia April 15-17, 2015, pp. 286-291

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NATURAL RADIOACTIVITY IN COAL, SLAG, AND FLY-ASH SAMPLES FROM

“NIKOLA TESLA” POWER PLANT – RISK ASSESSMENT

B. Šešlak a, M. Đuraševića, M. Erić b, A. Kandića, I. Vukanaca, Z. Marković b and Z. Miloševića

a Institute of Nuclear Sciences “Vinča”, Laboratory for Nuclear and Plasma Physics, University of Belgrade, Belgrade, RS,

b Institute of Nuclear Sciences “Vinča”, Laboratory of Thermal Engineering and Energy, University of Belgrade, Belgrade, RS

Abstract

Coal as basic fuel used in thermal power plants, and its combustion products such as slag and flyash, mainly contain naturally occurring radionuclides from the uranium and thorium series, and40K. Usage of coal, primarily in industry, as a result has spreading of radioactive material into the

environment and has as consequence an increase and/or redistribution of natural radionuclide

content. Thus, a possible health effect due to the exposure to these radionuclides could be expected

and should be estimated. The aim of this study was to determine the potential impact of radioactivematerial dispersion on the environment, as well as on the human health. For these purpose samples

of coal, slag, and fly-ash from thermal power plant "Nikola Tesla" were analyzed. Measuredactivity concentrations of naturally occurring radionuclides and calculated absorbed doses are

presented in this paper. The analysis confirmed that all measured and calculated values are below

the limits recommended in international legislation.

500 1000 1500 2000

3000

6000

9000

12000 500 1000 1500 2000

3000

6000

9000

12000 500 1000 1500 2000

3000

6000

9000

12000

214Bi

1120 keV

228Ac

911 keV

210Pb

46 keV226

Ra

186 keV

212Pb

238 keV214

Pb

352 keV

214Bi

609 keV

214Bi

1764 keV

40K 1460 keV

+228

Ac 1459 keV

Coal sample

C o u n t s

Energy [keV]

210Pb

46 keV226

Ra

186 keV

212Pb

238 keV214

Pb

352 keV214

Bi

609 keV 228Ac

911 keV

214Bi

1120 keV

40K 1460 keV

+228

Ac 1459 keV214

Bi

1764 keV

C o u n t s

Energy [keV]

Slag sample

210Pb

46 keV

226Ra

186 keV

212Pb

238 keV 214Pb

352 keV214

Bi

609 keV228

Ac

911 keV

214Bi

1120 keV

40K 1460 keV

+228

Ac 1459 keV

214Bi

1764 keV

C o u n t s

Energy [keV]

Fly-ash sample

Representative gamma spectra of coal, slag and fly-ash samples with the characteristic peaks labeled

7th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, Serbia, October

20 – 23, 2015.

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ANALYSIS OF RADIONUCLIDES CONTENT IN SOIL SAMPLES FROM AREA OF

ALEKSANDROVAČKA ŽUPA, SERBIA

M.M.Đurašević1, M.A.Milinčić2, A.B.Kandić1, I.S.Vukanac1, B.Ž.Šešlak 1, A. M. Lončar 2

and B. B. Lončar 3

1 Institute of Nuclear Sciences “Vinča”, Laboratory for Nuclear and Plasma Physics, University of Belgrade,

Belgrade, Serbia2 Faculty of Geography, University of Belgrade, Belgrade, Serbia

3 Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia

Abstract

Naturally occurring radionuclide (uranium, actinium and thorium series and 40K) are widespread

in the environment. In addition, significant amount of 137Cs may also be present in the soil as a

result of accidents, such as Chernobyl accident. Thus, monitoring of radionuclides content in soil

is of great importance.Aleksandrovac is small town in the western part of central Serbia and Župa is identified as theadministrative territory of Aleksandrovac municipality. Nature of Aleksandrovačka Župa is underthe long-lasting influence of anthropogenic factors, and therefore dominates altered natural

landscape.

Activity concentration of 226Ra, 232Th, 40K and 137Cs in 26 soil samples collected from differentlocation in the territory of Aleksandrovačka Župa were determined and presented. All soil sampleswere milled and sealed in 0.5 l Marinelli beakers, and stored for six weeks in order to reach

radiactive equlibrium between 226Ra and its descendants.

All samples were measured by means of coaxial semiconductor HPGe detector (ORTEC GEM-30, 37% relative efficiency and 1.8 keV resolution for 60Co at 1332 keV line). The detector was

calibrated using the standards in the same geometry spiked with common mixture of gamma-rayemitters certified by Czech Metrological Institute.

The activity concentrations of radionuclides 40K and 137Cs in soil samples were determined directly by analyzing full-energy peaks of their principal energies at 1460.83 keV and 661.66 keV,

respectively. The activity of 40K was corrected for the contribution of 228Ac (1459.14 keV). The

activity of 226Ra was determined by analyzing full-energy peak at 186.21 keV, corrected for thecontribution of 235U (185.72 keV) evaluated via 235U photo-peak at 143.77 keV and additionally

approved by analyzing activity concentrations of its descendants (214Bi and 214Pb). Furthermore,

the activity concentration of 232Th was determined by using the evaluated activity of itsdescendants (228Ac, 212Bi, 212Pb, and 208Tl). All obtained activity concentrations were corrected for

the coincidence summing effect, applying the calculation method of Debertin and Schötzig (1990).

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Table1. The ranges and average values with standard uncertainty ( s) of obtained activity

concentrations in soil samples

Soil

samples226Ra [Bq/kg] 232Th [Bq/kg] 40K [Bq/kg] 137Cs [Bq/kg]

range 12.8 - 50.0 23.5 - 62.4 315.3 – 860.3 0.2 – 32.1average ± s 30.5 ± 5.4 45.7 ± 2.3 527.6 ± 26.6 7.8 ± 0.5

Measured soil samples have activity concentrations of 232Th and 40K slightly higher than theWorld’s average (30 Bq/kg and 400 Bq/kg ) respectively, while activity concentration of 226Ra islower than the World’s average (35 Bq/k) (UNSCEAR 2000). The obtained activity concentrationsof 137Cs in analyzed soil samples are comparable with values previously reported.

Aleksandrovac municipality

Third International Conference on Radiation and Applications in Various Fields of Research

RAD2015, Slovenska Plaža, Budva, Montenegro, june 8

12, 2015, pp. 546

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RADIOLOGICAL ANALYSIS OF GROUNDWATER FROM DONJA ŽUPA,ALEKSANDROVAC, SERBIA: RADIONUCLIDE CONTENT AND RISK ASSESMENT

M. Đurašević1, M. Milinčić2, I. Vukanac1, A. Kandić1, B. Šešlak 1, Z. Milošević1 and B. Lončar 3

1 Institut of Nuclear Sciences „Vinča“, Laboratory for Nuclear and Plasma Physics, University of Belgrade, Belgrade, Serbia, [email protected]

2 Faculty of Geography, University of Belgrade, Belgrade, Serbia, [email protected] Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia, [email protected]

Abstract

Radiological analysis of drinking water is obligatory and regulated by national legislation and alsorequired by the long-term environmental monitoring plan. The presence of natural (uranium and

thorium series, and 40K) as well as artificial radionuclides (137Cs, 90Sr, 3H ...) could be detected in

drinking water. The results of gamma spectrometric measurements of the four samples of

groundwater from the territor y of Donja Župa, Aleksandrovac, Serbia, are presented in this paper.Obtained specific activities of 40K, 238U, 235U, 226Ra, 210Pb, 232Th, and 137Cs are less than values permited by appropriate national legislation. Annual effective dose, for an adult due to

consumption of these drinking waters, were calculated using obtained specific activities.Calculated values are less than the value recommended by the World Health Organization (0.1

mSv/year), except for sample IV, indicating needs for re-measurement with higher initial amount

of sample.

The locations of the groundwater sampling

Proceedings of the XXVIII Symposium of Society for Radiation Protection of Serbia and

Montenegro, Vršac, Serbia, 30 September-02 October, 2015, pp. 92-98

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APPLICATION OF SOFTWARE EFFTRAN IN RADIOLOGICAL ANALYSIS OF

COAL, SLAG AND ASH SAMPLES FROM THERMAL POWER PLANTS

A. Kandić1, B. Šešlak 1, M. Đurašević1, M. Erić2, I. Vukanac1,Z. Marković2 and Z. Milošević1

1 Institute of Nuclear Sciences “Vinča”, Laboratory for Nuclear and Plasma Physics, University of Belgrade, Belgrade, Serbia, [email protected]

2 Institute of Nuclear Sciences “Vinča”, Laboratory of Thermal Engineering and Energy, University of Belgrade, Belgrade, Serbia, [email protected]

Abstract

Coal, slag and ash from thermal power plants contain natural radionuclides whose specific activity

could be determined by semiconductor gamma spectrometry. These specific activities are

generally low, and therefore the samples should be measured at small distances from the detector,where coincidence summing effects are very pronounced. The corrections factors, obtained by

using software EFFTRAN, for coincidence summing effects in the case of radionuclides fromuranium (234mPa, 234Th, 226Ra, 214Bi and 214Pb) and thorium (228Ac, 224Ra, 212Pb, 212Bi and 208Tl)serie are presented in this paper, as well as corrected values for specific activities.

Proceedings of the XXVIII Symposium of Society for Radiation Protection of Serbia and

Montenegro, Vršac, Serbia, 30 September-02 October, 2015, pp. 464-469

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LONG-TERM MEASUREMENTS OF RADON, THORON AND THEIR AIRBORNE

PROGENY IN 25 SCHOOLS IN REPUBLIC OF SRPSKA

Z. Ćurguz1, Z. Stojanovska2, Z.S. Žunić3, P. Kolarž4, T. Ischikawa5, Y. Omori5, R. Mishra6,B.K. Sapra6, J. Vaupotič7, P. Ujić3, P. Bossew8

1 University of East Sarajevo, Faculty of Transport and Traffic Engineering, Vojvode Mišića 52, 74000 Doboj, Bosnia and Herzegovina

2 Goce Delcev University, Faculty of Medical Sciences, Stip, Republic of Macedonia3 Institute of Nuclear Sciences “Vinča”, U niversity of Belgrade, 11000 Belgrade, Serbia

4 University of Belgrade, Institute of Physics, Serbia5 Fukushima Medical University, Department of Radiation Physics and Chemistry, Hikariga-oka 1, Fukushima, 960-

1295, Japan6 Bhabha Atomic Research Centre, Radiological Physics and Advisory Division, Mumbai, India

7 Institute Jozef Stefan, Radon Centre, Jamova 39, 1000 Ljubljana, Slovenia8 German Federal Office for Radiation Protection, Köpenicker Allee 120-130, 10318 Berlin, Germany

Abstract

This article reports results of the first investigations on indoor radon, thoron and their decay

products concentration in 25 primary schools of Banja Luka, capital city of Republic Srpska. The

measurements have been carried out in the period from May 2011 to April 2012 using 3 types of

commercially available nuclear track detectors, named: long-term radon monitor (GAMMA 1)-

for radon concentration measurements (CRn); radon-thoron discriminative monitor (RADUET) for

thoron concentration measurements (CTn); while equilibrium equivalent radon concentration

(EERC) and equilibrium equivalent thoron concentrations (EETC) measured by Direct Radon

Progeny Sensors/Direct Thoron Progeny Sensors (DRPS/DTPS) were exposed in the period

November 2011 to April 2012. In each school the detectors were deployed at 10 cm distance fromthe wall. The obtained geometric mean concentrations were CRn = 99 Bq m−3 and CTn = 51 Bqm−3 for radon and thoron gases respectively. Those for equilibrium equivalent radon concentration

(EERC) and equilibrium equivalent thoron concentrations (EETC) were 11.2 Bq m−3 and 0.4 Bq

m−3, respectively. The correlation analyses showed weak relation only between C Rn and CTn as

well as between CTn and EETC. The influence of the school geographical locations and factors

linked to buildings characteristic in relation to measured concentrations were tested. The

geographical location and floor level significantly influence CRn while CTn depend only from

building materials (ANOVA, p ≤ 0.05). The obtained geometric mean values of the equilibriumfactors were 0.123 for radon and 0.008 for thoron.

Journal of Environmental Radioactivity, Volume 148, October 2015, Pages 163 – 169

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HIGH INDOOR RADON VARIATION INDUCED BY GEOLOGICAL FACTORS

Z. S. Zunic1, P. Ujic1, Laslo Nadjdjerdj1, I. V. Yarmoshenko2, S. B. Radanovic3,

S. Komatina Petrovic4, I. Celikovic1, M. Komatina4 and P. Bossew5

1 Institute of Nuclear Sciences “Vinča”, University of Belgrade, Belgrade, Serbia2 Institute of Industrial Ecology, Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia3 Economic Association for Production, Kolubara Mining Basen Ltd., Lazarevac, Serbia

4 Association of Geophysicists and Environmentalists of Serbia, Belgrade, Serbia5German Federal Office for Radiation Protection, Salzgitter, Germany

Abstract

In this work, the correlation between indoor radon concentration and the geological and

geochemical environment (i.e., rocks, soil and water) is investigated in four geologically verydifferent regions of South-Eastern Europe.

Variation of an order of magnitude of indoor radon concentration measured in several cases in

one season, compared to other seasons, is explained from a geological point of view. It is shownthat such unexpected behaviour of indoor radon concentration cannot be always attributed to the

outliners in the indoor radon measurement and they should be considered more carefully. One of

the goals of this study is also to make qualitative investigation of the relationship between the

indoor radon concentration and the geological background, in order to outline geogenic radon prone areas.

Besides the temporal variation of indoor radon, regarding the radon mapping, the spatial indoor

radon variation is also emphasized, since it is possible to have very localized area with high radon potential. Regarding the spatial variation, large differences of radon concentrations in different

rooms of the same house are noted in certain cases.

The measurements were performed in time series of different durations and sometimes longer

than one year. A method to estimate average annual radon concentration is presented in the caseof an interrupted time series. A method of non-linear regression is proposed to estimate the annual

mean concentration when one seasonal measurement is missing.

RADON in the ENVIRONMENT 2015, May 25-29, Kraków, 2015

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ENHANCING PHOTOCATALYTIC PROPERTIES OF RUTILE TiO2

BY CODOPING WITH N AND METALS - AB INITIO STUDY

J.Belošević-Čavor 1, K. Batalović1, V.Koteski1, J. Radaković1, C.M. Rangel2

1 Laboratory of Nuclear and Plasma Physics, University of Belgrade, Vinca Institute of Nuclear Sciences, P.O. Box

522, 11001 Belgrade, Serbia2 LNEG, National Laboratory for Energy and Geology, Paco do Lumiar 22, 1649-038 Lisbon, Portugal

Abstract

Substitutional N to O and M to Ti (M = Pt, V, Sb) codoped rutile TiO2 was investigated usingdensity functional theory (DFT) based calculations with both standard and hybrid exchange-

correlation functionals. The band gaps calculated using generalized gradient approximation (GGA)

exhibited narrowing compared to the pure rutile TiO2 in all the investigated cases. In contrast, the

results obtained with hybrid exchange-correlation functional showed that there was no band gap

narrowing, but doping induced localized states within the band gap just above the valence band,as well as below the conduction band for Pt doped TiO2. The presence of broad intermediate states

(IS) in the band gap could enhance visible light absorption through a two step optical transitionfrom the valence to the conduction band via the IS and at the same time lower recombination of

the photogenerated charges.

International Journal of Hydrogen Energy, Vol. 40 (2015) pp. 9696-9703.

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VIII

BIOPHYSICS

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THE INFLUENCE OF THE INTERCHAIN COUPLING ON LARGE ACOUSTIC

POLARONS IN COUPLED MOLECULAR CHAINS: THREE COPLANAR PARALLEL

MOLECULAR CHAINS

D. Čevizovića , Z. Ivića, D. Toprek b , D. Kapor c , Ž. Pržulja

aUniversity of Belgrade, ‘‘Vinča’’ Institute of Nuclear Sciences, Laboratory for Theoretical and Condensed Matter Physics, P.O. BOX 522, 11001 Belgrade, Serbia

bUniversity of Belgrade, ‘‘Vinča’’ Institute of Nuclear Sciences, Laboratory for Nuclear and Pla sma Physics, P.O. BOX 522, 11001 Belgrade, Serbia

c Department of Physics, Faculty of Science, University of Novi Sad, Trg Dositeja Obradovića 4, 21000 Novi Sad,Serbia

Abstract

We study the properties of the single large adiabatic polaron in the substances composed of three

parallel equally separated coplanar molecular chains. Particular attention has been devoted to the

influence of the interchain coupling strength on polaron stability in order to elucidate the origin of

the large polaron existence, which, contrary to the predictions of continuum adiabatic theories may

persist in realistic conditions.

Our results indicate the existence of the effectively two-dimensional stationary polarons with

comparably large longitudinal radius while the transverse one ranges from zero, in the absence of

interchain coupling, to approximately twice of the interchain separation when coupling strength

tends towards the infinity. These two-dimensional polarons are both energetically and dynamically

stable. This is quite the opposite to the expectations based on the traditional adiabatic large polaron

theories which, in the case of short – ranged electron – phonon interaction, predict that the stablelarge polaron may exist only in 1D systems. Stability of these 2D polarons increases with the

increase of the interchain coupling strength so that they may be comparably more stable than the pure 1D polarons.

Chaos, Solitons & Fractals (2015) Vol 73 pp. 71-79

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CALCULATIONS OF OPTICAL PROPERTIES OF SOME MOLECULES SUITABLE

FOR COATING OF NANOPARTICLES FOR BIOLOGICAL APPLICATION

D. Mamula Tartalja1 , B. Kuzmanović2, S. Bojanić3, I. Radisavljević2, N. Ivanović2

1 ICT College of Vocational Studies, Belgrade, Serbia2“Vinča” Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia.

3Universidad Politécnica de Madrid, Madrid, Spain.

Abstract

Coating of nanoparticles by various biocompatible molecules is a way to modify their surfaces andextend their bio-functionality. Infrared (IR) vibrations spectroscopy, and spectroscopy of

electronic transitions in the ultraviolet and visible (UV/V

Documents

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