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Phys. Rev. Lett. 85, 262–265 (2000)

Soft Dipole Resonance in the Neutron-Skin Nucleus 6He

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S. Nakayama1,*, T. Yamagata2, H. Akimune2, I. Daito3, H. Fujimura3, Y. Fujita4, M. Fujiwara3,5, K. Fushimi1, T. Inomata3, H. Kohri4, N. Koori1, K. Takahisa3, A. Tamii6, M. Tanaka7, and H. Toyokawa8
1Department of Physics, University of Tokushima, Tokushima 770-8502, Japan
2Department of Physics, Konan University, Kobe 658-8501, Japan
3Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
4Department of Physics, Osaka University, Osaka 560-0043, Japan
5Advanced Science Research Center, JAERI, Tokai, Ibaraki 319-1195, Japan
6Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
7Kobe Tokiwa Junior College, Kobe 653-0838, Japan
8SPring-8, Hyogo 678-12, Japan

Received 30 November 1999; published in the issue dated 10 July 2000

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°. Its cross section is deduced to be σ(0°) = 0.9±0.2 mb/sr. This value is comparable to that of the giant dipole resonance simultaneously measured.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.262
DOI:
10.1103/PhysRevLett.85.262
PACS:
25.70.Kk, 24.30.Cz, 27.20.+n

*Electronic address: nakayama@ias.tokushima-u.ac.jp

 
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