γ transitions in A = 7 hypernuclei and a possible derivation of hypernuclear size

Emiko Hiyama, M. Kamimura, K. Miyazaki, T. Motoba

研究成果: Contribution to journalArticle

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On the basis of the 5 ΛHe + N + N three-body model which has successfully been applied to a systematic study of the energy and nucleon halo structure of the A = 7 isotriplet hypernuclei, strengths of γ transitions in 7 ΛLi and 7 ΛHe are calculated. The new model confirms that the B(E2;5/2+→1/2+) value in 7 ΛLi is reduced remarkably in comparison with the corresponding B(E2;3+→1+) in the core nucleus 6Li. This is due to the gluelike role of the Λ particle which induces a contraction of the core nuclear size. It is suggested that a measurement of the 5/2+→1/2+E2 transition rate in 7 ΛLi (ongoing at KEK as E419) provides a unique opportunity to derive the hypernuclear size and hence to confirm the size contraction experimentally. The E2 and M1 transition strengths are also predicted for low-lying states in the hypernucleus 7 ΛHe whose core nucleus 6He is known to have a neutron halo. Another prediction is made of much enhanced E2 transitions in 7 ΛLi from the 5/2+ and 3/2+(T=1) states which are expected to have a proton halo structure.

元の言語英語
ページ(範囲)2351-2360
ページ数10
ジャーナルPhysical Review C - Nuclear Physics
59
発行部数5
出版物ステータス出版済み - 1 1 1999
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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