Resonant states of the neutron-rich Λ hypernucleus He Λ7

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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Article number054316
JournalPhysical Review C - Nuclear Physics
Volume91
Issue number5
DOIs
Publication statusPublished - May 18 2015

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hypernuclei
neutrons
thresholds
accelerators
nuclei
cross sections
decay
estimates
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Resonant states of the neutron-rich Λ hypernucleus He Λ7. / Hiyama, E.; Isaka, M.; Kamimura, M.; Myo, T.; Motoba, T.

In: Physical Review C - Nuclear Physics, Vol. 91, No. 5, 054316, 18.05.2015.

Research output: Contribution to journalArticle

Hiyama, E. ; Isaka, M. ; Kamimura, M. ; Myo, T. ; Motoba, T. / Resonant states of the neutron-rich Λ hypernucleus He Λ7. In: Physical Review C - Nuclear Physics. 2015 ; Vol. 91, No. 5.
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