Physics Letters B 747 (2015) 129–134
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Physics Letters B
www.elsevier.com/locate/physletb
Hypernuclear production cross section in the reaction of
6
Li +
12
C at
2 A GeV
C. Rappold
a,b,∗
, T.R. Saito
a,c,d,e
, O. Bertini
a,c
, S. Bianchin
a
, V. Bozkurt
a,f
, E. Kim
a,g
,
M. Kavatsyuk
h
, Y. Ma
a,c
, F. Maas
a,c,d
, S. Minami
a
, D. Nakajima
a,i
, B. Özel-Tashenov
a
,
K. Yoshida
a,d,j
, P. Achenbach
c
, S. Ajimura
k
, T. Aumann
l,a
, C. Ayerbe Gayoso
c
, H.C. Bhang
g
,
C. Caesar
l,a
, S. Erturk
f
, T. Fukuda
n
, B. Göküzüm
a,f
, E. Guliev
h
, J. Hoffmann
a
, G. Ickert
a
,
Z.S. Ketenci
f
, D. Khaneft
a,c
, M. Kim
g
, S. Kim
g
, K. Koch
a
, N. Kurz
a
, A. Le Fèvre
a,m
,
Y. Mizoi
n
, L. Nungesser
c
, W. Ott
a
, J. Pochodzalla
c,d
, A. Sakaguchi
j
, C.J. Schmidt
a
,
M. Sekimoto
o
, H. Simon
a
, T. Takahashi
o
, G.J. Tambave
h
, H. Tamura
p
, W. Trautmann
a
,
S. Voltz
a
, C.J. Yoon
g
a
GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany
b
Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
c
Johannes Gutenberg-Universität Mainz, J.J. Becherweg 40, 55099 Mainz, Germany
d
The Helmholtz Institute Mainz (HIM), J.J. Becherweg 40, 55099 Mainz, Germany
e
Iwate University, Morioka, Iwate 020-8550, Japan
f
Nigde University, 51100 Nigde, Turkey
g
Seoul National University, Gwanakro Sillim-dong, Gwanak-gu, Seoul 151-747, Republic of Korea
h
KVI, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands
i
The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
j
Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
k
Research Centre for Nuclear Physics (RCNP), 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
l
Technische Universität Darmstadt, 64289 Darmstadt, Germany
m
SUBATECH, La Chantrerie, 4 rue Alfred Kastler, BP 20722, 44307 Nantes, France
n
Osaka Electro-Communication University, Hatsu-cho 18-8, Neyagawa, Osaka 572-8530, Japan
o
KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
p
Tohoku University, 6-3 Aoba Aramaki Aoba Sendai, Miyagi 980-7875, Japan
a r t i c l e i n f o a b s t r a c t
Article history:
Received
23 December 2014
Received
in revised form 17 April 2015
Accepted
25 May 2015
Available
online 27 May 2015
Editor:
V. Metag
Keywords:
Hypernuclei
Production
cross section
Yield
ratio
Relativistic
energy
Heavy
ion collision
Hypernuclear production cross sections have been deduced for the first time with induced reaction of
heavy ion beam on fixed target and by means of the invariant mass method by the HypHI Collaboration
exploiting
the reaction of
6
Li +
12
C at 2 A GeV or
√
s
NN
= 2.70 GeV. Aproduction cross section of
3.9 ±1.4μbfor
3
H and of 3.1 ±1.0μbfor
4
H respectively in the projectile rapidity region was inferred
as well as the total production cross section of the hyperon was measured and found to be equal to
1.7 ±0.8mb. Aglobal fit based on a Bayesian approach was performed in order to include and propagate
statistical and systematic uncertainties. Production ratios of
3
H/
4
H,
3
H/ and
4
H/ were included in
the inference procedure. The strangeness population factors S
3
and S
4
of
3
H and
4
H respectively were
extracted. In addition, the multiplicities of the hyperon,
3
H, and
4
H together with the rapidity and
transversal momentum density distributions of the observed hypernuclei were extracted and reported.
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
*
Corresponding author.
E-mail
addresses: c.rappold@gsi.de (C. Rappold), t.saito@gsi.de (T.R. Saito).
1. Introduction
Reactions between complex nuclei have been a powerful tool
to investigate subatomic structures as well as chemical proper-
ties
of nuclear matter. In relativistic heavy ion collisions, the gen-
http://dx.doi.org/10.1016/j.physletb.2015.05.059
0370-2693/
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.