Soft Dipole Resonance in the Neutron-Skin Nucleus <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>H</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>6</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mi>e</mi></math></span>

S. Nakayama; T. Yamagata; H. Akimune; I. Daito; 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 ${}^{6}H e$

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

Phys. Rev. Lett. 85, 262 – Published 10 July 2000

Abstract

A candidate for a soft dipole resonance, a dipole oscillation mode between a core cluster and a neutron skin, was observed at $E_{x} = 4 \pm 1 MeV$ and with a width of $4 \pm 1 MeV$ in $^{6} He$ via the $^{6} Li (^{7} Li,^{7} Be)$ reaction at an incident energy of $65 A MeV$ and forward scattering angles including $0 °$ . Its cross section is deduced to be $σ (0 °) = 0.9 \pm 0.2 mb / sr$ . This value is comparable to that of the giant dipole resonance simultaneously measured.