Effects of $\bm\la$ hyperons on the deformations of even-even nuclei

Abstract

The deformations of multi-Λ hypernuclei corresponding to even-even core nuclei ranging from 8 Be to 40 Ca with 2, 4, 6, and 8 hyperons are studied in the framework of the deformed Skyrme-Hartree-Fock approach. It is found that the deformations are reduced when adding 2 or 8 Λ hyperons, but enhanced when adding 4 or 6 Λ hyperons. These differences are attributed to the fact that Λ hyperons are filled gradually into the three deformed p orbits, of which the [110]1/2 − orbit is prolately deformed and the degenerate [101]1/2 − and [101]3/2 − orbits are oblately deformed.