Generalized Seniority on Deformed Single-Particle Basis

Abstract

Recently we proposed [62] a fast computing scheme for generalized seniority on spherical single-particle basis. This work redesigns the scheme to make it applicable to deformed single-particle basis. The algorithm is applied to the rare-earth nucleus ${}_{64}^{158}$Gd${}_{94}$ for intrinsic (body-fixed frame) neutron excitations under the low-momentum {\emph{NN}} interaction $V_{\mathrm{low}-\mathrm{k}}$. By allowing as many as four broken pairs, we compute the lowest $300$ intrinsic states of several multipolarity. These states converge well to the exact ones, showing generalized seniority is very effective in truncating the deformed shell model. Under realistic interactions, the picture remains approximately valid that the ground state is a coherent pair condensate, and the pairs gradually break up as excitation energy increases.

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• Scission Dynamics with K Partitions
• Nucleon-pair truncation of the shell model for medium-heavy nuclei
• Variational Principle Directly on the Coherent Pair Condensate. I. the BCS Case
• Application of the variational principle to a coherent-pair condensate: The HFB case