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

doi:10.1103/PhysRevLett.87.122502

Dipole Excitation of $α$ Clusters in ${}^{6}L i$ and ${}^{7}L i$

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

Phys. Rev. Lett. 87, 122502 – Published 4 September 2001

Abstract

Dipole excitations in highly excited energy regions of $^{6} He$ and $^{7} He$ nuclei were investigated via the ( $^{7} Li,^{7} Be$ ) reaction with an incident energy of $65 A MeV$ at forward scattering angles. The resonances at $Q ≃ - 30 MeV$ observed commonly for both $^{6} Li$ and $^{7} Li$ targets were found to be excited via both spin-flip and spin-nonflip transitions with $Δ L = 1$ . Based on the observed excitation energy, width, and cross section of each resonance, the relevant resonances are inferred to be analogs of the dipole resonances of $α$ clusters in the $^{6} Li$ and $^{7} Li$ nuclei.

Received 20 February 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.122502

Authors & Affiliations

S. Nakayama^1,*, T. Yamagata², H. Akimune², I. Daito³, H. Fujimura⁴, Y. Fujita⁵, M. Fujiwara^4,6, K. Fushimi¹, M. B. Greenfield⁷, H. Kohri⁴, N. Koori¹, K. Takahisa⁴, A. Tamii⁸, M. Tanaka⁹, and H. Toyokawa¹⁰

¹Department of Physics, University of Tokushima, Tokushima 770-8502, Japan
²Department of Physics, Konan University, Kobe 658-8501, Japan
³Department of Physics, Nagoya University, Nagoya 464-8603, Japan
⁴Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
⁵Department of Physics, Osaka University, Osaka 560-0043, Japan
⁶Advanced Science Research Center, JAERI, Tokai 319-1195, Japan
⁷Department of Physics, International Christian University, Tokyo 181-8585, Japan
⁸Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
⁹Kobe Tokiwa Junior College, Kobe 653-0838, Japan
¹⁰SPring-8, Hyogo 679-5198, Japan