Resonant states of the neutron-rich Λ hypernucleus He Λ7

E. Hiyama, M. Isaka, M. Kamimura, T. Myo, T. Motoba

研究成果: Article査読

17 被引用数 (Scopus)

抄録

The structure of the neutron-rich Λ hypernucleus, 7ΛHe is studied within the framework of an α+Λ+n+n four-body cluster model. We predict second 3/2+ and 5/2+ states, corresponding to a 0sΛ coupled to the second 2+ state of 6He, as narrow resonant states with widths of Γ∼1 MeV to be at 0.03 and 0.07 MeV with respect to the α+Λ+n+n threshold. From a separate estimate of the differential cross section for the 7Li(γ,K+)7ΛHe reaction, we suggest a possibility to observe these states at the Thomas Jefferson National Accelerator Facility (JLab) in the future. We also calculate the second 2+ state of 6He as a resonant state within the framework of an α+n+n three-body cluster model. Our result is 2.81 MeV with Γ=4.63 MeV with respect to the α+n+n threshold. This energy position is ∼1 MeV higher, and with a much broader decay width, than the recent SPIRAL data. We suggest that an experiment at JLab to search for the second 3/2+ and 5/2+ states of 7ΛHe would provide an opportunity to confirm the second 2+ state of the core nucleus 6He.

本文言語English
論文番号054316
ジャーナルPhysical Review C - Nuclear Physics
91
5
DOI
出版ステータスPublished - 2015 5月 18
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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