Deformation of hypernuclei studied with antisymmetirzed molecular dynamics

Abstract

An extended version of the antisymmetrized molecular dynamics to study structure of $p$-$sd$ shell hypernuclei is developed. By using an effective $\Lambda N$ interaction, we investigate energy curves of ${}_{\Lambda }^9$Be, ${}_{\Lambda }^{13}$C and ${}_{\Lambda }^{20,21}$Ne as function of nuclear quadrupole deformation. Change of nuclear deformation caused by $\Lambda$ particle is discussed. It is found that the $\Lambda$ in p-wave enhances nuclear deformation, while that in s-wave reduces it. This effect is most prominent in ${}_{\Lambda }^{13}$C. The possibility of the parity inversion in ${}_{\Lambda }^{20}$Ne is also examined.