Soft dipole resonance in the neutron-skin nucleus 6He

S Nakayama; T Yamagata; H Akimune; I Daito I; H Fujimura; Y Fujita; M Fujiwara; K Fushimi; T Inomata; H Kohri; N Koori; K Takahisa; A Tamii; M Tanaka; H Toyokawa

doi:10.1103/PhysRevLett.85.262

Soft dipole resonance in the neutron-skin nucleus 6He

Phys Rev Lett. 2000 Jul 10;85(2):262-5. doi: 10.1103/PhysRevLett.85.262.

Authors

S Nakayama¹, T Yamagata, H Akimune, I Daito I, H Fujimura, Y Fujita, M Fujiwara, K Fushimi, T Inomata, H Kohri, N Koori, K Takahisa, A Tamii, M Tanaka, H Toyokawa

Affiliation

¹ Department of Physics, University of Tokushima, Tokushima 770-8502, Japan.

PMID: 10991258
DOI: 10.1103/PhysRevLett.85.262

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.