Different effect of the hyperons $Λ$ and $Ξ$ on the nuclear core

Details Different effect of the hyperons $Λ$ and $Ξ$ on the nuclear core Different effect of the hyperons $Λ$ and $Ξ$ on the nuclear core

2002-09-20

arxiv.org/abs/nucl-th/0209060v5

Eur.Phys.J. A20 (2004) 257-262

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures

Scientific paper

10.1140/epja/i2003-10151-x

We demonstrate the different effect of strange impurities ($\Lambda$ and $\Xi$) on the static properties of nuclei within the framework of the relativistic mean-field model. Systematic calculations show that the gluelike role of $\Lambda$ hyperon is universal for all $\Lambda$-hypernuclei considered. However, $\Xi^-$ hyperon has the gluelike role only for the protons distribution in nuclei, and for the neutrons distribution $\Xi^-$ hyperon plays a repulsive role. On the other hand, $\Xi^0$ hyperon attracts surrounding neutrons and reveals a repulsive force to the protons. Possible explanations of the above observation are discussed.

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