Nuclear Shell Model by the Quantum Monte Carlo Diagonalization Method.

The feasibility of shell-model calculations is radically extended by the Quantum Monte Carlo Diagonalization method with various essential improvements. The major improvements are made in the sampling for the generation of shell-model basis vectors, and in the restoration of symmetries such as angular momentum and isospin. Consequently the level structure of low-lying states can be studied with realistic interactions. After testing this method on 24Mg, we present first results for energy levels and E2 properties of 64Ge, indicating its large and γ-soft deformation. PACS numbers: 21.60.Ka, 21.60.Cs, 24.10.Cn Typeset using REVTEX