We demonstrate the different effect of strange impurities (ฮ and
ฮ) on the static properties of nuclei within the framework of the
relativistic mean-field model. Systematic calculations show that the gluelike
role of ฮ hyperon is universal for all ฮ-hypernuclei
considered. However, ฮโ hyperon has the gluelike role only for the protons
distribution in nuclei, and for the neutrons distribution ฮโ hyperon plays
a repulsive role. On the other hand, ฮ0 hyperon attracts surrounding
neutrons and reveals a repulsive force to the protons. Possible explanations of
the above observation are discussed.Comment: 8 pages, 3 figure