title: Soft dipole resonance in the neutron-skin nucleus 6He
abstract: 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.
authors.affiliation: Department of Physics, University of Tokushima, Tokushima 770-8502, Japan.
authors.initials: S
authors.lastname: Nakayama
authors.initials: T
authors.lastname: Yamagata
authors.initials: H
authors.lastname: Akimune
authors.initials: I
authors.lastname: Daito
authors.initials: H
authors.lastname: Fujimura
authors.initials: Y
authors.lastname: Fujita
authors.initials: M
authors.lastname: Fujiwara
authors.initials: K
authors.lastname: Fushimi
authors.initials: T
authors.lastname: Inomata
authors.initials: H
authors.lastname: Kohri
authors.initials: N
authors.lastname: Koori
authors.initials: K
authors.lastname: Takahisa
authors.initials: A
authors.lastname: Tamii
authors.initials: M
authors.lastname: Tanaka
authors.initials: H
authors.lastname: Toyokawa