Three-body model study of A=6–7 hypernuclei: Halo and skin structures

Emiko Hiyama, Masayasu Kamimura, Toshio Motoba, Taiichi Yamada, and Yasuo Yamamoto
Phys. Rev. C 53, 2075 – Published 1 May 1996
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Abstract

Low-lying states of A=6 hypernuclear doublets (Λ6He and LiΛ6) and A=7 triplets (Λ7He, LiΛ7, and BeΛ7) are studied with an accurate three-body model calculation in which all the rearrangement Jacobian coordinates are equally taken into account. Since most of the hypernuclear states concerned are weakly bound states, focus is placed on the binding energies with respect to the particle breakup thresholds and on the density distributions in the surface and exterior regions. With the α+Λ+N model, the observed binding energies of the ground states of HeΛ6 and LiΛ6 are well reproduced. HeΛ6 is found to have a three-layer structure of the matter distribution: the α nuclear core, a Λ skin, and a neutron halo. The A=7 hypernuclei are shown to be well described with the HeΛ5 + N+N model. Using a realistic NN interaction, the correlation between the valence nucleons is fully taken into account; this is essentially important to make the proton-rich three-body system BeΛ7 = HeΛ5 + p+p bound although none of the two-body subsystems is bound. The observed binding energies of LiΛ7 and BeΛ7 are well reproduced, and energies are predicted for HeΛ7 whose core nucleus is a neutron halo nucleus, He6. We discuss the validity of the assumption of frozen deuterons adopted in the previous α+d+Λ models for the T=0 states of LiΛ7. © 1996 The American Physical Society.

  • Received 2 January 1996

DOI:https://doi.org/10.1103/PhysRevC.53.2075

©1996 American Physical Society

Authors & Affiliations

Emiko Hiyama and Masayasu Kamimura

  • Department of Physics, Kyushu University, Fukuoka 812, Japan

Toshio Motoba

  • Laboratory of Physics, Osaka Electro-Communication University, Neyagawa, Osaka 572, Japan

Taiichi Yamada

  • Laboratory of Physics, Kanto Gakuin University, Yokohama 236, Japan

Yasuo Yamamoto

  • Physics Section, Tsuru University, Tsuru, Yamanashi 402, Japan

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Vol. 53, Iss. 5 — May 1996

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