Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-12-12
Nucl.Phys.A814:66-73,2008
Physics
Nuclear Physics
Nuclear Theory
12 pages, 1 figure, title and text were modified, the version to appear in Nucl. Phys. A
Scientific paper
10.1016/j.nuclphysa.2008.10.001
The most recent development of the quark-meson coupling (QMC) model, in which the effect of the mean scalar field in-medium on the hyperfine interaction is also included self-consistently, is used to compute the properties of finite hypernuclei. The calculations for $\Lambda$ and $\Xi$ hypernuclei are of comparable quality to earlier QMC results without the additional parameter needed there. Even more significantly, the additional repulsion associated with the increased hyperfine interaction in-medium completely changes the predictions for $\Sigma$ hypernuclei. Whereas in the earlier work they were bound by an amount similar to $\Lambda$ hypernuclei, here they are unbound, in qualitative agreement with the experimental absence of such states. The equivalent non-relativistic potential felt by the $\Sigma$ is repulsive inside the nuclear interior and weakly attractive in the nuclear surface, as suggested by the analysis of $\Sigma$-atoms.
Guichon Pierre A. M.
Thomas Anthony W.
Tsushima Kazuo
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