Intrinsic Structure of Light Nuclei in Monte Carlo Shell Model Calculation

Abstract

Wavefunctions obtained from the Monte Carlo shell model (MCSM) calculation are investigated. It has been difficult to discuss the intrinsic structure of nuclei in conventional shell-model calculations. We propose a way to describe an intrinsic state in the MCSM and demonstrate the appearance of two-α-cluster structure in the 8Be ground state. The changes of cluster shape with respect to the number of major shell and basis is discussed. The shape of the 10Be ground state is also investigated. The behavior of valence neutron is consistent with the picture of molecular orbit state. The method is also applied to the 6He ground state, which is expected to have the asymmetric distribution of valence neutrons.