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The positive-parity excited states of Ni-56 and instability of the N = Z = 28 shell gap are discussed on the basis of the antisymmetrized molecular dynamics calculation using the Gogny D1S effective interaction. It is found that Ni-56 is quite soft against oblate deformation and the N = Z = 28 closed-shell configuration amounts to only 62% in the ground state. It is also found that the shell gap easily disappears by prolate deformation, which leads to the coexistence of the almost spherical ground band, excited beta and gamma bands, and a prolate superdeformed band with (f(7/2))(-m)(p(3/2))(m) configurations within the small excitation energies. Furthermore, in the highly excited region, it is predicted that a couple of strongly deformed bands with (sd)(-m)(pf)(-n)(g(9/2))(m+n) configurations are built on the 0(+) states around 20 MeV

physical review c

Collectivity and instability of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>28</mml:mn></mml:mrow></mml:math>shell gap and strongly deformed bands with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>g</mml:mi><mml:mrow><mml:mn>9</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>configuration in<mml:math xmlns:mml="http://www.w3.org/1998/…

Collectivity and instability of theN=Z=28shell gap and strongly deformed bands withg9/2configuration in