SHELL-MODEL CALCULATION OF THE BETA(+) DECAY OF CD-98, PD-96 AND RU-94

Shell-model calculations of the beta+ decay of 94Ru, 96Pd and Cd-98 are presented and compared to recent experiments. Two choices of model space are considered for the valence protons: the 0g9/2 space and the 0g9/2, 1p1/2, 1p3/2 space. In addition the Gamow-Teller operator is renormalized by considering first-order corrections to the initial wavefunctions. It is shown that the combined effects of enlarging the model space and renormalizing the Gamow-Teller operator improve the agreement with experiment but still, with the exception of the 94Ru decay, the calculated hindrance factors are smaller than the observed ones.