Investigation of pairing correlations on computed Gamow–Teller strength distributions and associated [formula omitted]-decay half-lives

Abstract

We investigate the effect of pairing correlations on the computed Gamow–Teller (GT) strength distributions and corresponding β-decay half-lives. The calculations are performed for a total of 47 sd-shell nuclei, for 20 < A < 30, employing the pn-QRPA model. Our calculations use three different values of pairing gaps computed using three different empirical formulae. The GT strength distribution and centroid values change considerably with a change in the pairing gap values. This in turn leads to differences in computed half-lives. The pairing gaps computed using the mass-dependent formula result in the calculated half-lives in better agreement with the measured data.