Monte Carlo shell model calculation for unstable nuclei around N=20

摘要

We have made a systematic shell-model calculation for unstable nuclei around N = 20 by the Monte Carlo shell model. The persistence or vanishing of the N = 20 magic number is one of our major interest. The effective interaction is constructed by paying careful attention to the interplay of the T = 1 and 0 monopole interactions, producing a varying single-particle structure as a function of N and Z. The yrast-state properties, the competition and mixing of the normal and intruder configurations, and the shape coexistence are discussed. [References: 36]