Band Structure in the Doubly Magic Nucleus ⁵⁶Ni

Band structures near yrast lines of the Z=N doubly magic nucleus ⁵⁶Ni are investigated with the configuration-dependent cranked Nilsson--Strutinsky approach. The observed deformed bands are confirmed as highly deformed and their properties are explained theoretically. The calculated transition quadrupole moments Q_t, ～ 1.7 eb at low spin as well as the kinematic and dynamic moments of inertia J⁽¹⁾ and J⁽²⁾ for configurations of interest are found to be generally in good agreement with the observed results. Two terminating states at 20⁺ and 29^_ for the two observed bands and other terminations in ⁵⁶Ni are also predicted. It is found that the configuration-dependent cranked Nilsson--Strutinsky approach is better in the description of nuclear properties and band structures at high spin than other models.