Soft dipole resonance in the neutron-skin nucleus 6He
A candidate for a soft dipole resonance, a dipole oscillation mode between a core cluster and a neutron skin, was observed at Ex = 4+/-1 MeV and with a width of 4+/-1 MeV in 6He via the 6Li( 7Li, 7Be) reaction at an incident energy of 65A MeV and forward scattering angles including 0 degrees. Its cross section is deduced to be sigma(0 degrees ) = 0.9+/-0.2 mb/sr. This value is comparable to that of the giant dipole resonance simultaneously measured.
Nakayama
S
Department of Physics, University of Tokushima, Tokushima 770-8502, Japan.
Yamagata
T
Akimune
H
Daito
I
Fujimura
H
Fujita
Y
Fujiwara
M
Fushimi
K
Inomata
T
Kohri
H
Koori
N
Takahisa
K
Tamii
A
Tanaka
M
Toyokawa
H