STRUCTURE OF LI AND BE ISOTOPES STUDIED WITH ANTISYMMETRIZED MOLECULAR-DYNAMICS

Structure of odd-even and even-even isotopes of Li and Be is studied systematically with antisymmetrized molecular dynamics which is a theoretical method free from any model assumptions such as the existence of clustering. The construction of energy-minimum intrinsic states with definite parity is made by the use of the frictional cooling method. Angular momentum projection is applied to these intrinsic states in order to obtain the eigenstates of angular momentum. It is shown that the clustering structure appears in the nuclei in the N approximate to Z region with N and Z standing for the neutron and proton numbers, respectively. The clustering structure changes toward the shell-model-like structure as N increases to around N approximate to 8. Furthermore appearance of new-type clustering features is suggested in the neutron-richer region with N > 8. Energy spectra and other quantities are shown to be reproduced well. Especially the calculated magnetic moments describe the observed data quite well, and the neutron number dependence of the observed magnetic moments is explained as the reflection of the structure change of the isotopes from the clustering structure to the shell-model-like structure. It is indicated that the density dependence of the effective interaction is important.