Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-09-20
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.
Ning Ping-Zhi
Tan Yu-Hong
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