Deformation of hypernuclei studied with antisymmetrized molecular dynamics

Abstract

An extended version of antisymmetrized molecular dynamics was developed to study the structure of p-sd shell hypernuclei. By using an effective N interaction, we investigated the energy curves of 9 Be, 13 C, and 20,21 Ne as a function of nuclear quadrupole deformation. The changes to nuclear deformation caused by particles are discussed. We found that in the p wave enhances nuclear deformation, while that in the s wave reduces it. This effect is most prominent in 13 C. The possibility of parity inversion in 20 Ne is also examined.

Impurity Effects in Λ Hypernuclei

“…Owing to the ΛN attraction, structure of the core nuclei can change. For example, in a light Λ hypernucleus 7 Λ Li having well-pronounced α + d + Λ cluster structure, the addition of a Λ particle causes the reduction of the inter-cluster distance between α and d, which has been confirmed through the observation of the E2 transition probabilities [1,2]. In heavier hypernuclei, it is considered that mean-field like structure dominates in the ground states.…”

“…In this study, we have utilized the HyperAMD model [7,8]. The Hamiltonian used in this study is given as,Ĥ…”

“…Since most nuclei manifest quadrupole deformation, it is of interest to investigate changes of nuclear deformations due to the addition of a Λ particle, which many authors have studied [7,[14][15][16][17][18][19][20].…”

“…To study such phenomena, we have applied the AMD model extended to hypernuclei (Hyper-AMD) to these hypernuclei [7]. Combined with the generator coordinate method (GCM), it is possible to predict the low-lying level structure and structure changes of Λ hypernuclei [8].…”

“…Combined with the generator coordinate method (GCM), it is possible to predict the low-lying level structure and structure changes of Λ hypernuclei [8].…”