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Author Hiyama, E. ♦ Kamimura, M. ♦ Motoba, T. ♦ Yamada, T. ♦ Yamamoto, Y.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HELIUM 6 ♦ THREE-BODY PROBLEM ♦ LITHIUM 6 ♦ HELIUM 7 ♦ LITHIUM 7 ♦ BERYLLIUM 7 ♦ HYPERNUCLEI ♦ BOUND STATE ♦ BINDING ENERGY ♦ DENSITY ♦ GROUND STATES
Abstract Low-lying states of {ital A}=6 hypernuclear doublets ({sub {Lambda}}{sup 6}He and {sub {Lambda}}{sup 6}Li) and {ital A}=7 triplets ({sub {Lambda}}{sup 7}He, {sub {Lambda}}{sup 7}Li, and {sub {Lambda}}{sup 7}Be) 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 {alpha}+{Lambda}+{ital N} model, the observed binding energies of the ground states of {sub {Lambda}}{sup 6}He and {sub {Lambda}}{sup 6}Li are well reproduced. {sub {Lambda}}{sup 6}He is found to have a three-layer structure of the matter distribution: the {alpha} nuclear core, a {Lambda} skin, and a neutron halo. The {ital A}=7 hypernuclei are shown to be well described with the {sub {Lambda}}{sup 5}He + {ital N}+{ital N} model. Using a realistic {ital NN} interaction, the correlation between the valence nucleons is fully taken into account; this is essentially important to make the {ital proton}-{ital rich} three-body system {sub {Lambda}}{sup 7}Be = {sub {Lambda}}{sup 5}He + {ital p}+{ital p} bound although none of the two-body subsystems is bound. The observed binding energies of {sub {Lambda}}{sup 7}Li and {sub {Lambda}}{sup 7}Be are well reproduced, and energies are predicted for {sub {Lambda}}{sup 7}He whose core nucleus is a neutron halo nucleus, {sup 6}He. We discuss the validity of the assumption of frozen deuterons adopted in the previous {alpha}+{ital d}+{Lambda} models for the {ital T}=0 states of {sub {Lambda}}{sup 7}Li. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Place United States
Journal Physical Review, C
Volume Number 53
Issue Number 5


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