Structure of A=7 iso-triplet Λ hypernuclei studied with the four-body cluster model

Emiko Hiyama, Y. Yamamoto, T. Motoba, M. Kamimura

Research output: Contribution to journalArticle

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Abstract

The structure of the T=1 isotriplet hypernuclei, Λ7He, Λ7Li, and Λ7Be within the framework of an α+Λ+N+N four-body cluster model is studied. Interactions between the constituent subunits are determined so as to reproduce reasonably well the observed low-energy properties of the αN, αΛ, αNN, and αΛN subsystems. Furthermore, the two-body ΛN interaction is adjusted so as to reproduce the 0+-1+ splitting of Λ4H. Also, a phenomenological ΛN charge symmetry breaking (CSB) interaction is introduced. The Λ binding energy of the ground state in Λ7He is predicted to be 5.16(5.36)MeV with (without) the CSB interaction. The calculated energy splittings of the 3/2+-5/2+ states in Λ7He and Λ7Li are around 0.1MeV. We point out that there is a three-layer structure of the matter distribution, α particle, Λ skin, and proton or neutron halo, in the Λ7He(J=5/2+), Λ7Li(J=5/2+), and Λ7Be(J=1/2+) states.

Original languageEnglish
Article number054321
JournalPhysical Review C - Nuclear Physics
Volume80
Issue number5
DOIs
Publication statusPublished - Nov 30 2009
Externally publishedYes

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hypernuclei
broken symmetry
interactions
halos
binding energy
neutrons
ground state
protons
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Structure of A=7 iso-triplet Λ hypernuclei studied with the four-body cluster model. / Hiyama, Emiko; Yamamoto, Y.; Motoba, T.; Kamimura, M.

In: Physical Review C - Nuclear Physics, Vol. 80, No. 5, 054321, 30.11.2009.

Research output: Contribution to journalArticle

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