Comparisons between shell-model calculations, seniority truncation, and quasiparticle approximations: Application to the odd Ni isotopes and odd <i>N=82</i> isotones

L. Losano; H. Dias; F. Krmpotić; B. H. Wildenthal

doi:10.1103/PhysRevC.38.2902

Comparisons between shell-model calculations, seniority truncation, and quasiparticle approximations: Application to the odd Ni isotopes and odd N=82 isotones

L. Losano, H. Dias, F. Krmpotić, and B. H. Wildenthal

Phys. Rev. C 38, 2902 – Published 1 December 1988

Abstract

A detailed study of the results of correcting BCS approximation for the effects of particle-number projection and blocking has been carried out. A low-seniority shell-model approximation was used as the frame of reference for investigating the mixing of one- and three-quasiparticle states in odd-mass Ni isotopes and in odd-mass N=82 isotones. We discuss the results obtained for the energy spectra and electromagnetic decay properties. Effects of seniority-five configurations on the low-lying states have also been studied through the comparison of the low-seniority shell-model results with those which arose from the corresponding full shell-model calculations.