Sigma-nucleus potential in A=28.
We have studied the (pi(-),K+) reaction on a silicon target to investigate the sigma-nucleus potential. The inclusive spectrum was measured at a beam momentum of 1.2 GeV/c with an energy resolution of 3.3 MeV (FWHM) by employing the superconducting kaon spectrometer system. The spectrum was compared with theoretical calculations within the framework of the distorted-wave impulse approximation, which demonstrates that a strongly repulsive sigma-nucleus potential with a nonzero size of the imaginary part reproduces the observed spectrum.
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
H
H
Noumi
P K
PK
Saha
D
D
Abe
S
S
Ajimura
K
K
Aoki
H C
HC
Bhang
T
T
Endo
Y
Y
Fujii
T
T
Fukuda
H C
HC
Guo
K
K
Imai
O
O
Hashimoto
H
H
Hotchi
E H
EH
Kim
J H
JH
Kim
T
T
Kishimoto
A
A
Krutenkova
K
K
Maeda
T
T
Nagae
M
M
Nakamura
H
H
Outa
M
M
Sekimoto
T
T
Saito
A
A
Sakaguchi
Y
Y
Sato
R
R
Sawafta
Y
Y
Shimizu
T
T
Takahashi
L
L
Tang
H
H
Tamura
K
K
Tanida
T
T
Watanabe
H H
HH
Xia
S H
SH
Zhou
L H
LH
Zhu
X F
XF
Zhu