The quark-meson coupling model for Lambda, Sigma and Xi hypernuclei

Details The quark-meson coupling model for Lambda, Sigma and Xi hypernuclei The quark-meson coupling model for Lambda, Sigma and Xi hypernuclei

1997-07-16

arxiv.org/abs/nucl-th/9707022v2

Nucl.Phys.A630:691-718,1998

Physics

Nuclear Physics

Nuclear Theory

27 pages, 14 postscript figures, uses epsfig.sty. Version to appear in Nucl. Phys. A

Scientific paper

10.1016/S0375-9474(98)00806-9

The quark-meson coupling (QMC) model, which has been successfully used to describe the properties of both infinite nuclear matter and finite nuclei, is applied to a systematic study of $\Lambda, \Sigma$ and $\Xi$ hypernuclei. Assumptions made in the present study are, (i) the (self-consistent) exchanged scalar, and vector, mesons couple only to the u and d quarks, and (ii) an SU(6) valence quark model for the bound nucleons and hyperon. The model automatically leads to a very weak spin-orbit interaction for the $\Lambda$ in a hypernucleus. Effects of the Pauli blocking at the quark level, particularly in the open, coupled, $\Sigma N - \Lambda N$ channel (strong conversion), is also taken into account in a phenomenological way.

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