Abstract
The coexistence of spherical and deformed states and the instability of the N = Z = 28 shell gap in ^56Ni are investigated on the basis of the antisymmetrized molecular dynamics calculation using the Gogny D1S interaction. We found that ^56Ni is quite soft against oblate deformation and the N = Z = 28 closed-shell configuration amounts only 62% in the ground state. It is also found that the N = Z = 28 shell gap easily dissappears by prolate deformation and the superdeformed N = Z = 28 shell gap appears in turn. The softness and instability of N = Z = 28 shell gap lead to the coexistence of the almost spherical ground state, deformed β- and γ-bands and prolate SD band within small excitation energies.
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