Abstract
We study Cr and Ni isotopes by Monte Carlo shell model (MCSM) calculations in a pfg9d5 shell. In the MCSM, the wave function is represented as a linear combination of angular-momentum- and parity-projected deformed Slater determinants (MCSM bases), and we can calculate eigenstates in a large model space such as the pfg9d5 shell. We study the intrinsic shape of nuclei by using deformations of the unprojected MCSM bases. We show calculated results of Cr and Ni isotopes and a level scheme of 68Ni, and discuss the strength of the magicity of N = 40 in Cr and Ni isotopes and shape coexistence in 68Ni.
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