Spin-isospin excitations and beta(+)/EC half-lives of medium-mass deformednuclei

A selfconsistent approach based on a deformed HF + BCS + QRPA method with d ensity-dependent Skyrme forces is used to describe beta (+)-decay propertie s in even-even deformed proton-rich nuclei. Residual spin-isospin forces ar e included in the particle-hole and particle-particle channels. The quasipa rticle basis contains neutron-neutron and proton-proton pairing correlation s in the BCS approach, while neutron-proton pairing interaction is treated as a residual force in QRPA. We discuss the sensitivity of Gamow-Teller str ength distributions and beta (+)/EC half-lives to deformation, pairing and the strength of the particle-particle interaction. The dependence on deform ation is also compared to that of spin Ml strength distributions. (C) 2001 Elsevier Science B.V. All rights reserved.