Evaluation of theβ⁺-decay logftvalue with inclusion of the neutron-proton pairing and particle-number projection

Abstract

Abstract. The neutron-proton isovector pairing effect on the beta-plus decay log f t values is studied in typical mirror N Z nuclei. The log f t values are calculated by including or not the isovector pairing before and after a particle-number projection using the Sharp-Bardeen-Cooper-Schrieffer (SBCS) method. It is shown that the values obtained after projection in the isovector pairing case are the closest ones to experimental data. The effect of the deformation of the mother and daughter nuclei on the log f t is also studied.