View
0
Download
0
Category
Preview:
Citation preview
4He(π−,π+)反応による テトラ中性子核の探索計画
Search for Tetraneutron in the 4He(π−,π+) Reaction
Hiroyuki Fujioka (Kyoto Univ.)
Hiroyuki Fujioka (Kyoto Univ.)
today’s talk based on … 2
Letter of Intent for J-PARC 50GeV Synchrotron
Search for tetraneutron by pion double charge exchange reaction on 4He
H. Fujioka,∗ S. Kanatsuki, T. Nagae, and T. NanamuraDepartment of Physics, Kyoto University
T. Fukuda and T. HaradaOsaka Electro-Communication University
E. Hiyama, K. Itahashi,† and T. NishiRIKEN Nishina Center(Dated: June 27, 2016)
Candidates of a tetraneutron resonance state, composed of four neutrons, have been observed ina heavy-ion double charge exchange reaction at RIBF. We would like to investigate this exotic stateby a pion double charge exchange reaction at the High-Intensity High-Resolution beamline in anextended Hadron Experimental Facility, which is currently in a planning stage.
nu ,d the (π− π+) r
http://j-parc.jp/researcher/Hadron/en/Proposal_e.html
Hiroyuki Fujioka (Kyoto Univ.)
motivated by … 3
Candidate Resonant Tetraneutron State Populated by the 4Heð8He;8BeÞ Reaction
K. Kisamori,1,2 S. Shimoura,1 H. Miya,1,2 S. Michimasa,1 S. Ota,1 M. Assie,3 H. Baba,2 T. Baba,4 D. Beaumel,2,3
M. Dozono,2 T. Fujii,1,2 N. Fukuda,2 S. Go,1,2 F. Hammache,3 E. Ideguchi,5 N. Inabe,2 M. Itoh,6 D. Kameda,2 S. Kawase,1
T. Kawabata,4 M. Kobayashi,1 Y. Kondo,7,2 T. Kubo,2 Y. Kubota,1,2 M. Kurata-Nishimura,2 C. S. Lee,1,2 Y. Maeda,8
H. Matsubara,12 K. Miki,5 T. Nishi,9,2 S. Noji,10 S. Sakaguchi,11,2 H. Sakai,2 Y. Sasamoto,1 M. Sasano,2 H. Sato,2
Y. Shimizu,2 A. Stolz,10 H. Suzuki,2 M. Takaki,1 H. Takeda,2 S. Takeuchi,2 A. Tamii,5 L. Tang,1 H. Tokieda,1
M. Tsumura,4 T. Uesaka,2 K. Yako,1 Y. Yanagisawa,2 R. Yokoyama,1 and K. Yoshida21
2
PRL 116, 052501 (2016)Selected for a Viewpoint in Physics
PHY S I CA L R EV I EW LE T T ER Sweek ending
5 FEBRUARY 2016
Hiroyuki Fujioka (Kyoto Univ.)
contents
1. What is “tetraneutron”?
2. Historical overview
3. Recent observation at RIBF
4. pion DCX (=double charge exchange) reaction
5. experimental plan at J-PARC
4
Hiroyuki Fujioka (Kyoto Univ.)
multi-neutron system or “Neutronium”
❖ 1n (neutron)
❖ 2n (di-neutron) unbound by ≈ 70 keV ; ann ~ −18fm
❖ 3n (tri-neutron) : hypothetical
❖ 4n (tetra-neutron) : hypothetical
5https://en.wikipedia.org/wiki/Neutronium
bound state? resonance?
argued for half a century… (theories) unlikely to exist (most experiments) not observed
Hiroyuki Fujioka (Kyoto Univ.)
6
(1s1/2)2(1p3/2)2 dineutron-dineutron cluster
If a bound/resonant tetraneutron state does exist, some extraordinary mechanism should play a role.
??? ???
Hiroyuki Fujioka (Kyoto Univ.)
constraint on tetraneutron 7
D.R. Tilley et al., NPA 745, 155 (2004)
❖ 8He→4He+4n forbidden⇒ B.E.(4n)<3.1MeV
❖ 6He+2n dominance in 8He break-up⇒ B.E.(4n)<1MeV
❖ unbound 5H (→3H+2n)⇒ bound 4n unlikely
Hiroyuki Fujioka (Kyoto Univ.)
constraint on tetraneutron (cont’d) 8
D.R. Tilley et al., NPA 541, 1 (1992)
nolow-lying T=2 state
noT=2 resonance
4n?
(T=2)
Hiroyuki Fujioka (Kyoto Univ.)
bound tetraneutron in 14Be break-up 9# bi s pea or g p LB , nd B T param ters , b, c of Eq. 1# ste
gy s i he sh d a a o p n tused in the presen analy is; he p r en age of
FI 6 Sc ter plo
F. M. Marqués et al., PRC 65, 044006 (2002); see also arXiv:nucl-ex/0504009v1
10Be
single neutron (detected by a liquid scintillator)
a on may xp ct o app a 7# O g to pair g a df
the dr p-l e
x .
REVIEW C 65 4400
6 candidates of14Be break-up into
10Be+4n
Hiroyuki Fujioka (Kyoto Univ.)
incompatibility with other nuclides? 10
04 !0: 7, and ener y. The
-50
-40
-30
-20
-10
0
Ene
rgy
(MeV
)
1S0-2π 1S0-AV1′ AV18 Exp
0+
2n1+
2H1/2+
3H
0+
4n 2−
4H
1/2+
5H
0+
6n
6He 6Li
0+
8n
A
W
+
ese e orm
-120
-40
-20
0
Vijk Vijkl
p
1/2+
3H
0+
4n2−
4H0+
4He
1/2+
3/2−0+
6He
1+
Li
modified NN interactionchanges energies of other nuclides,
including di-neutron
0+
4n
i n
difi d S0inclusion of extra 3N or 4N interaction
drastically changesenergies of A>4 nuclides
S. C. Pieper, PRL 90, 252501 (2003)
“should the results of Ref. [1] be confirmed …,our current very successful understanding of nuclear forces
would have to be severely modifiedin ways that, at least to me, are not at all obvious.”
Hiroyuki Fujioka (Kyoto Univ.)
non-observation in transfer reaction 11
Fig 4 The I4 energy spe trum for he ‘Li “B, 0)4n reaction. The ull ine c fo the 40 + n a n he e it h n
8 V a p may pp ar from the reac on o t 65 MeV
of 1C nuc ei f om t e
θ1s
D. V. Aleksandrov et al. JETP Letters 81, 43 (2005).
A. V. Belozyorov et al., NPA 477, 131 (1988)
7Li(9Be,12N)4n
9Be(9Be,14O)4n7Li(11B,14O)4n
Hiroyuki Fujioka (Kyoto Univ.)
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
He9(1/2-)
0.30 MeV
n
Li93/2-
178.3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
He100+
0.3 MeV
n
Li101.2 MeV
n
Be100+
1.51E+6 y
β-
C100+
19.255 s
EC
N10
Li113/2-
8.5 ms
β-n,β-2n,...
Be111/2+
13.81 s
β-α
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Li12
Be120+
23.6 ms
β-
B121+
20.20 ms
β-3α
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
Be13(1/2,5/2)+0.9 MeV
n
B133/2-
17.36 ms
β-n
N131/2-
9.965 m
EC
O13(3/2-)
8.58 ms
ECp
Be140+
4.35 ms
β-n,β-2n,...
B142-
13.8 ms
β-
C140+
5730 y
β-
O140+
70.606 s
EC
F14(2-)
p
B1510.5 ms
β-
C151/2+
2.449 s
β-
O151/2-
122.24 s
EC
F15(1/2+)
1.0 MeV
p
B16(0-)
200 Ps
n
C160+
0.747 s
β-n
N162-
7.13 s
β-α
F160-
40 keV
p
B17(3/2-)
5.08 ms
β-n
C17193 ms
β-n
N171/2-
4.173 s
β-n
F175/2+
64.49 s
EC
C180+
95 ms
β-n
N181-
624 ms
β-n,β-α,...
F181+
109.77 m
EC
β-n
N19(1/2-)
0.304 s
β-n
O195/2+
26.91 s
β-
β-n
O200+
13.51 s
β-
F202+
11.00 s
β-
(1/2
β-
F215/2+
4.158 s
β-
4
β-
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
B113/2-
80.1
C120+
98.90
C131/2-
1.10
N141+
99.634
N151/2-
0.366
O160+
99.762
O175/2+
0.038
O180+
0.200
F191/2+
100
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
2.7×10 -6%18.9984032
27
-219.62-188.12°-129.02°
-1
2 6 8
10 12
4n? transfer reaction
break-up reaction
Table of Isotopes
Hiroyuki Fujioka (Kyoto Univ.)
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
He9(1/2-)
0.30 MeV
n
Li93/2-
178.3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
He100+
0.3 MeV
n
Li101.2 MeV
n
Be100+
1.51E+6 y
β-
C100+
19.255 s
EC
N10
Li113/2-
8.5 ms
β-n,β-2n,...
Be111/2+
13.81 s
β-α
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Li12
Be120+
23.6 ms
β-
B121+
20.20 ms
β-3α
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
Be13(1/2,5/2)+0.9 MeV
n
B133/2-
17.36 ms
β-n
N131/2-
9.965 m
EC
O13(3/2-)
8.58 ms
ECp
Be140+
4.35 ms
β-n,β-2n,...
B142-
13.8 ms
β-
C140+
5730 y
β-
O140+
70.606 s
EC
F14(2-)
p
B1510.5 ms
β-
C151/2+
2.449 s
β-
O151/2-
122.24 s
EC
F15(1/2+)
1.0 MeV
p
B16(0-)
200 Ps
n
C160+
0.747 s
β-n
N162-
7.13 s
β-α
F160-
40 keV
p
B17(3/2-)
5.08 ms
β-n
C17193 ms
β-n
N171/2-
4.173 s
β-n
F175/2+
64.49 s
EC
C180+
95 ms
β-n
N181-
624 ms
β-n,β-α,...
F181+
109.77 m
EC
β-n
N19(1/2-)
0.304 s
β-n
O195/2+
26.91 s
β-
β-n
O200+
13.51 s
β-
F202+
11.00 s
β-
(1/2
β-
F215/2+
4.158 s
β-
4
β-
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
B113/2-
80.1
C120+
98.90
C131/2-
1.10
N141+
99.634
N151/2-
0.366
O160+
99.762
O175/2+
0.038
O180+
0.200
F191/2+
100
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
2.7×10 -6%18.9984032
27
-219.62-188.12°-129.02°
-1
2 6 8
10 12
4n? transfer reaction
break-up reaction
Table of Isotopes double charge exchange reaction
Hiroyuki Fujioka (Kyoto Univ.)
candidates of resonant tetraneutron 14
186 MeV/u 8He beam (~2MHz)
8Be→2α momentum-analyzed
one 8He in one bunch(to avoid accidental coincidence)
the 8He beam was 99. %.
he momenta f two
h-r olut n s ec
y beam wa
for a
f l ofs
mr tspectrometer.
Hiroyuki Fujioka (Kyoto Univ.)
candidates of resonant tetraneutron 15K. Kisamori et al., PRL 116, 052501 (2016)
significance: 4.9 σ (w/ look-elsewhere effect) energy: 0.83±0.65±1.25 MeVwidth : <2.6MeV (FWHM) above 4n threshold (or not)?
Hiroyuki Fujioka (Kyoto Univ.)
ab-initio 4N calculation 16
Re(E) (MeV
the eye the resonance
HIYAMA, R LAZAUSKAS KA
−40 −30 −20 −10 0−14
−12
−10
−8
−6
−4
(a) T=1, Jπ=2−
3H+N threshold
3He+N
4Li4He
4H
W1(T=3/2) (MeV)
E (
MeV
)
3 N
introduction of strong 3N force→ 4H, 4He (I=1), 4Li below 3H(3He)+N threshold
E. Hiyama, R. Lazauskas, J. Carbonell, and M. Kamimura, PRC 93, 044004 (2016)
Hiroyuki Fujioka (Kyoto Univ.)
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
He9(1/2-)
0.30 MeV
n
Li93/2-
178.3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
He100+
0.3 MeV
n
Li101.2 MeV
n
Be100+
1.51E+6 y
β-
C100+
19.255 s
EC
N10
Li113/2-
8.5 ms
β-n,β-2n,...
Be111/2+
13.81 s
β-α
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Li12
Be120+
23.6 ms
β-
B121+
20.20 ms
β-3α
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
Be13(1/2,5/2)+0.9 MeV
n
B133/2-
17.36 ms
β-n
N131/2-
9.965 m
EC
O13(3/2-)
8.58 ms
ECp
Be140+
4.35 ms
β-n,β-2n,...
B142-
13.8 ms
β-
C140+
5730 y
β-
O140+
70.606 s
EC
F14(2-)
p
B1510.5 ms
β-
C151/2+
2.449 s
β-
O151/2-
122.24 s
EC
F15(1/2+)
1.0 MeV
p
B16(0-)
200 Ps
n
C160+
0.747 s
β-n
N162-
7.13 s
β-α
F160-
40 keV
p
B17(3/2-)
5.08 ms
β-n
C17193 ms
β-n
N171/2-
4.173 s
β-n
F175/2+
64.49 s
EC
C180+
95 ms
β-n
N181-
624 ms
β-n,β-α,...
F181+
109.77 m
EC
β-n
N19(1/2-)
0.304 s
β-n
O195/2+
26.91 s
β-
β-n
O200+
13.51 s
β-
F202+
11.00 s
β-
(1/2
β-
F215/2+
4.158 s
β-
4
β-
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
B113/2-
80.1
C120+
98.90
C131/2-
1.10
N141+
99.634
N151/2-
0.366
O160+
99.762
O175/2+
0.038
O180+
0.200
F191/2+
100
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
2.7×10 -6%18.9984032
27
-219.62-188.12°-129.02°
-1
2 6 8
10 12
4n?Table of Isotopes
double charge exchange reaction
satisfies almost recoilless condition4He(8He,8Be)
Hiroyuki Fujioka (Kyoto Univ.)
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
He9(1/2-)
0.30 MeV
n
Li93/2-
178.3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
He100+
0.3 MeV
n
Li101.2 MeV
n
Be100+
1.51E+6 y
β-
C100+
19.255 s
EC
N10
Li113/2-
8.5 ms
β-n,β-2n,...
Be111/2+
13.81 s
β-α
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Li12
Be120+
23.6 ms
β-
B121+
20.20 ms
β-3α
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
Be13(1/2,5/2)+0.9 MeV
n
B133/2-
17.36 ms
β-n
N131/2-
9.965 m
EC
O13(3/2-)
8.58 ms
ECp
Be140+
4.35 ms
β-n,β-2n,...
B142-
13.8 ms
β-
C140+
5730 y
β-
O140+
70.606 s
EC
F14(2-)
p
B1510.5 ms
β-
C151/2+
2.449 s
β-
O151/2-
122.24 s
EC
F15(1/2+)
1.0 MeV
p
B16(0-)
200 Ps
n
C160+
0.747 s
β-n
N162-
7.13 s
β-α
F160-
40 keV
p
B17(3/2-)
5.08 ms
β-n
C17193 ms
β-n
N171/2-
4.173 s
β-n
F175/2+
64.49 s
EC
C180+
95 ms
β-n
N181-
624 ms
β-n,β-α,...
F181+
109.77 m
EC
β-n
N19(1/2-)
0.304 s
β-n
O195/2+
26.91 s
β-
β-n
O200+
13.51 s
β-
F202+
11.00 s
β-
(1/2
β-
F215/2+
4.158 s
β-
4
β-
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
B113/2-
80.1
C120+
98.90
C131/2-
1.10
N141+
99.634
N151/2-
0.366
O160+
99.762
O175/2+
0.038
O180+
0.200
F191/2+
100
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
2.7×10 -6%18.9984032
27
-219.62-188.12°-129.02°
-1
2 6 8
10 12
4n?Table of Isotopes
double charge exchange reaction
satisfies almost recoilless condition4He(8He,8Be) 4He(π-,π+)
Hiroyuki Fujioka (Kyoto Univ.)
examples of pion DCX measurements 19
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
n
Li93/2-
178.3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
n
Be100+
1.51E+6 y
β-
C100+
19.255 s
EC
N10
Be111/2+
13.81 s
β
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Be120+
23.6 ms
β
B121+
20 20 ms
β-3α
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
Be13(1/2,5/2)+0.9 MeV
B133/2-
17.36 ms
β-n
N131/2-
9.965 m
EC
O13(3/2-)
8.58 ms
ECp
Be140+
4.35 ms
β β 2
B142-
13.8 ms
β-
C140+
5730 y
β-
O140+
70.606 s
EC
14(2-)
B1510.5 ms
β-
C151/2+
2.449 s
β-
O151/2-
122.24 s
EC
1/ +0 MeV
B16(0-)
200 Ps
n
C160+
0.747 s
β-n
N162-
7.13 s
β-α
0-0 keV
B17(3/2-)
5.08 ms
β-n
C17193 ms
β-n
N171/2-
4.173 s
β-n
5/6 .49 s
C180+
95 ms
β-n
N181-
624 ms
β-n,β-α,...
1109.7 m
N19(1/2-)
0.304 s
β-n
O195/2+
26.91 s
β-
O200+
13.51 s
β-
F.
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
B113/2-
80.1
C120+
98.90
C131/2-
1.10
N141+
99.634
N151/2-
0.366
O160+
99.762
O175/2+
0.038
O180+
0.200
/2+
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
°12 °
-1
2 4 6
12
F mat c o xperim se up
thr ld Che he n
ns ored r e-e ntt oun esc p 30 e hesc d a g e
l r icl n rif
a y to houg had ec of ng
soluti o a out 8 MeVx ll
ora o ngleab lut br ion ei er ha n le spect o e ma has th curacyor easu ere ore
esse t d a atio
~ 25 Vm ) tunate ch aen l ab e ea tioi h V
(ta ge 0an nd rt r ed cha ica d m gn
h m tp mon
e pe ipart in
d a
F G 2 S
K.K. Seth et al., PRL 41, 1589 (1978)
Hiroyuki Fujioka (Kyoto Univ.)
examples of pion DCX measurements 20
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
He9(1/2-)
0.30 MeV
n
Li93/2-
178 3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
He100+
0.3 MeV
n
Li101.2 MeV
n
1
β-
C100+
19.255 s
EC
N10
Li113/2-
8.5 ms
β-n,β-2n,...
β-α
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Li12
β-
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
n
EC
O13(3/2-)
8.58 ms
ECp
β-n,β-2n,...
EC
14(2-)
1/ +0 MeV
0-0 keV
5/26 .49 s
1109.7 m
F
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
/2+
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
°12 °
-1
2 4 6 8
10
K.K. Seth et al., PRL 58, 1930 (1987)
OLUME 58 NUMBER 19 P CAL
and C targets were do e with the a
was FWHM
F . M -mas p ct un+) 9H f r ) = l b =
ol oml k h
he po nom al r ofoly p rM m l
Hiroyuki Fujioka (Kyoto Univ.)
examples of pion DCX measurements 21
n11/2+
614.6 s
β-
H31/2+
12.33 y
β-
H42-
Li42-
H5
He53/2-
0.60 MeV
n
Li53/2-
1.5 MeV
p
Be5
H6
He60+
806.7 ms
β-
Be60+
92 keV
2p
He7(3/2)-
160 keV
n
Be73/2-
53.12 d
EC
B7(3/2-)
1.4 MeV
He80+
119.0 ms
β-n
Li82+
838 ms
β-2α
Be80+
6.8 eV
2α
B82+
770 ms
EC2α
C80+
230 keV
He9(1/2-)
0.30 MeV
n
Li93/2-
178.3 ms
β-n
B93/2-
0.54 keV
2pα
C9(3/2-)
126.5 ms
ECp,ECp2α,...
He100+
0.3 MeV
n
Li101.2 MeV
n
Be100+
1.51E+6 y
β-
C100+
19.255 s
EC
N10
Li113/2-
8.5 ms
β-n,β-2n,...
Be111/2+
13.81 s
β-α
C113/2-
20.39 m
EC
N111/2+
740 keV
p
Li12
Be120+
23.6 ms
β-
B121+
20.20 ms
β-3α
N121+
11.000 ms
EC3α
O120+
0.40 MeV
2p
Be13(1/2,5/2)+0.9 MeV
n
B133/2-
17.36 ms
β-n
N131/2-
9.965 m
EC
O13(3/2-)
8.58 ms
ECp
Be140+
4.35 ms
β-n,β-2n,...
B142-
13.8 ms
β-
C140+
5730 y
β-
O140+
70.606 s
EC
14(2-)
B1510.5 ms
β-
C151/2+
2.449 s
β-
O151/2-
122.24 s
EC
1/ +0 MeV
B16(0-)
200 Ps
n
C160+
0.747 s
β-n
N162-
7.13 s
β-α
0-0 keV
B17(3/2-)
5.08 ms
β-n
C17193 ms
β-n
N171/2-
4.173 s
β-n
5/6 .49 s
C180+
95 ms
β-n
N181-
624 ms
β-n,β-α,...
1109.7 m
N19(1/2-)
0.304 s
β-n
O195/2+
26.91 s
β-
O200+
13.51 s
β-
4
H11/2+
99.985
H21+
0.015
He31/2+
0.000137
He40+
99.999863
Li61+
7.5
Li73/2-
92.5
Be93/2-
100
B103+
19.9
B113/2-
80.1
C120+
98.90
C131/2-
1.10
N141+
99.634
N151/2-
0.366
O160+
99.762
O175/2+
0.038
O180+
0.200
/2+
1H
91.0%1.00794
1 -259.34°-252.87°-240.18°
+1-1
2He
8.9%4.002602
2 -272.2°-268.93°-267.96°
0
3Li
1.86×10 -7%6.941
21
180.5°1342°
+1
4Be
2.38×10 -9%9.012182
22
1287°2471°
+2
5B
6.9×10 -8%10.811
23
2075°4000°
+3
6C
0.033%12.0107
24
4492t°3642s°
+2+4-4
7N
0.0102%14.00674
25
-210.00°-195.79°-146.94°
±1±2±3+4+5
8O
0.078%15.9994
26
-218.79°-182.95°-118.56°
-2
9F
°12 °
-1
2 6 8
10 12
4n?
Hiroyuki Fujioka (Kyoto Univ.)
4He(π−,π+) reaction❖ Ungar et al.: Tπ=165MeV, θπ=0° @ LAMPF → dσ/dΩ = 7±15nb/sr
❖ Gorringe et al.: Tπ=80MeV, 50°<θπ<130° @ TRIUMF→ dσ/dΩ <13nb/sr
22
Se
u d pec e .
J.E. Ungar et al., PLB 144 (1984) 333
The beam ntensitymo e tum bit s
e m tum o n/c The accepta ce wa t mine t be
n ei c was f un o b r e enden ; a
e on s r unding t T a anu nted b S l T ese os t ve o s reduce
m er acce ta e Co se ue t yeptan e had b o r cted for
s m nSe n y due to o l mit d mo
c t t f "He m
in ow ob ne s o owsMe /c of s ec m b) on ains 2
p
0 100 20 1 0 160 180
m from
F
0 50 — af er all of waree
T.P. Gorringe et al., PRC 40 (1989) 2390
(BG subtracted)
Hiroyuki Fujioka (Kyoto Univ.)
cf. 6Li(π−,K+) reaction (pπ=1.2GeV/c) 23[ ], .
l ci le ho he e ent result
A magn fi d view around he Λ
H. Sugimura et al. (J-PARC E10 collaboration), Phys. Lett. B 729 (2014) 39upper limit of 6ΛH formation cross section: 1.2nb/sr (90% C.L.)
Hiroyuki Fujioka (Kyoto Univ.)
revisiting pion-DCX reaction❖ searching for a very weak peak near 4n threshold
‣ not only in the bound region but in the unbound region
❖ reduction of unphysical background is important
‣ contribution from target cell
‣ PID of projectiles and ejectiles
‣ beam contaminant, π± decay in flight,single-charge-exchange followed by π0→2γ, γ→e+e−
❖ High-Energy (far above Δ region) + High-Intensity + High-Resolution experiment will improve the sensitivity
24
Hiroyuki Fujioka (Kyoto Univ.)
J-PARC HIHR beamline 25
Extended Hadron Hall
5
• < 2.0 GeV/c • ~106 K-/spill
Muon • 30 GeV proton • <31 GeV/c unseparated 2ndary
beams (mostly pions), ~107/spill
• < 1.1 GeV/c • ~105 K-/spill
• < 1.2 GeV/c • ~106 K-/spill
• <10 GeV/c separated pion, kaon, pbar
• ~107/spill K-, pbars
• 5 deg extraction • ~5.2 GeV/c K0
• Good n/K
• < 2.0 GeV/c • 1.8x108 pion/spill • x10 better Dp/p
105 m
(in a planning stage)
Hiroyuki Fujioka (Kyoto Univ.)
J-PARC HIHR beamline 26
17
HIHR LineJ-PARC ExHH
A23
ElectrostaticSeparator
Prod. T
High Res.Spectrometer
Exp. Target
Mass Slit
AchromaticFocus
Intensity: ~ 1.8x108 pion/pulse(1.2 GeV/c, 58 m, 1.4msr*%,
100kW, 6s spill, Pt 60mm)Dp/p ~ 1/10000
0.E+00
1.E+08
2.E+08
3.E+08
4.E+08
5.E+08
6.E+08
7.E+08
0.5 1 1.5 2
Beam
Inte
nsity
[pio
ns/6
s]
Beam Momentum [GeV/c]
H. Noumi, “International workshop on physics at the extended hadron experimental facility of J-PARC”
high-precision Λ hypernuclear spectroscopy w/ (π±, K+)FWHM: 300keV
Hiroyuki Fujioka (Kyoto Univ.)
experimental condition (tentative)
❖ 850MeV π- beam
❖ beam intensity ~1.6×108 / spill (Sanford-Wang formula)
❖ momentum transfer ~ 31MeV/c
❖ With 2 g/cm2 liquid 4He target,formation cross section 1nb/sr ⇒ 97 events in 2 weeks
27
Hiroyuki Fujioka (Kyoto Univ.)
pion DCX reaction above Δ region 28
cita ion ener y spectrum for t e 9Be(14C 14 O
d n an l g tra si ion o
n n-analog tra nly
available data < 550MeV (LAMPF)
D.P. Beatty et al., PRC 48, 1428 (1993)
ai e
r l
theory
E. Oset and D. Strottman, PRL 70, 146 (1993)
Hiroyuki Fujioka (Kyoto Univ.)
phase-0 experiment 29
Letter of Intent for J-PARC 50GeV Synchrotron
Investigation of Pion Double Charge Exchange Reaction with S-2S Spectrometer
H. Fujioka,∗ S. Kanatsuki, T. Nagae, and T. NanamuraDepartment of Physics, Kyoto University
T. Fukuda and T. HaradaOsaka Electro-Communication University
E. Hiyama, K. Itahashi, and T. NishiRIKEN Nishina Center(Dated: June 27, 2016)
We will study pion double charge exchange (π±,π∓) reactions with approximately 850MeV(980MeV/c) π beams at J-PARC. The ultimate goal is to search for a tetraneutron resonancestate (4n), whose candidates have been observed in the 4He(8He, 8Be) reaction at RIBF. First of all,an analog transition, the 18O(π+,π−)18Ne (g.s.) reaction, will be investigated at the existing K1.8beamline with the S-2S spectrometer. It will be an important step toward a non-analog transition,the 4He(π−,π+)4n reaction, with much smaller cross section.
http://j-parc.jp/researcher/Hadron/en/Proposal_e.html
Hiroyuki Fujioka (Kyoto Univ.)
phase-0 experiment❖ 18O(π+, π-)18Ne(g.s.) at existing K1.8 beamline
‣ + S-2S spectrometer(constructed for Ξ-hypernuclear spectroscopy)
‣ first investigation far above Δ-resonance region
‣ large cross section expected(because of analog transition)
‣ cf. 4He (I=0) → 4n (I=2) : non-analog transition
‣ 400 counts per day(with 107 π+/spill impinging on 2 g/cm2 H218O target)
30
Hiroyuki Fujioka (Kyoto Univ.)
conclusion
❖ Recent observation of tetraneutron bound/resonance states challenges our understanding on nuclear force and few-body systems.
❖ From an experimental point of view, an independent approach with a different reaction will be meaningful.
❖ We propose to investigate the pion double charge exchange reaction with Tπ ~ 850 MeV at J-PARC.
❖ As phase-0, we will examine an analog transition (18O→18Ne) at K1.8 beamline with S-2S spectrometer.
31
Recommended