Spin–isospin excitations and [formula omitted] half-lives of medium-mass deformed nuclei

Abstract

A selfconsistent approach based on a deformed HF +BCS +QRPA method with density-dependent Skyrme forces is used to describe β + -decay properties in even–even deformed proton-rich nuclei. Residual spin–isospin forces are included in the particle–hole and particle–particle channels. The quasiparticle basis contains neutron–neutron and proton–proton pairing correlations in the BCS approach, while neutron–proton pairing interaction is treated as a residual force in QRPA. We discuss the sensitivity of Gamow–Teller strength distributions and β +/ EC half-lives to deformation, pairing and the strength of the particle–particle interaction. The dependence on deformation is also compared to that of spin M1 strength distributions.