Generalization of the NₚNₙ scheme to non-yrast levels of even-even nuclei

الأصل · EN

In this paper we present the systematics of excitation energies for even-even nuclei in two regions: the 50<Z≤66, 82<N≤104 region, and the 66<Z<82, 82<N≤104 region. Using the NₚNₙ scheme, we obtain compact trajectories for the ground band as well as quasi-β and quasi-γ bands. This suggests that the NₚNₙ scheme is useful even if one extends it to non-yrast levels, and thus can serve as a general tool to disclose new types of structural evolution for higher excitations, besides the yrast states which have been investigated extensively. It is highlighted that deformations in non-yrast quasibands of nuclei with Z 80 and N 104 are often very different from those in the ground bands.