Hypernuclear fine structure in (16)(Lambda)O and the LambdaN tensor interaction.
We have observed two gamma-ray transitions in (16)(Lambda)O from the 6.6 MeV excited 1(-)(2) state to both ground-state spin-doublet members (1(-)(1),0(-)) by the (K-,pi(-)gamma) reaction. We have obtained the ground-state doublet spacing to be 26.4+/-1.6(stat)+/-0.5(syst) keV and the excitation energy of the 1(-)(2) state to be 6561.7+/-1.1(stat)+/-1.7(syst) keV. The ground-state doublet spacing provides a small but nonzero strength of the tensor interaction between a Lambda and a nucleon. This is the first experimental result on the LambdaN tensor interaction.
Ukai
M
M
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
Ajimura
S
S
Akikawa
H
H
Alburger
D E
DE
Banu
A
A
Chrien
R E
RE
Franklin
G B
GB
Franz
J
J
Hashimoto
O
O
Hayakawa
T
T
Hotchi
H
H
Imai
K
K
Kishimoto
T
T
May
M
M
Millener
D J
DJ
Minami
S
S
Miura
Y
Y
Miyoshi
T
T
Mizunuma
K
K
Nagae
T
T
Nakamura
S N
SN
Nakazawa
K
K
Okayasu
Y
Y
Pile
P
P
Quinn
B P
BP
Rusek
A
A
Sato
Y
Y
Sutter
R
R
Takahashi
H
H
Tang
L
L
Tamura
H
H
Tanida
K
K
Yuan
L
L
Zhou
S H
SH