Beta-decay properties of ${}^{25}$Si and ${}^{26}$P

Abstract

The ${\hat{I}}^2$-decay properties of the neutron-deficient nuclei ${}^{25}$Si and ${}^{26}$P have been investigated at the GANIL/LISE3 facility by means of charged-particle and ${\hat{I}}^3$-ray spectroscopy. The decay schemes obtained and the Gamow-Teller strength distributions are compared to shell-model calculations based on the USD interaction. B(GT) values derived from the absolute measurement of the ${\hat{I}}^2$-decay branching ratios give rise to a quenching factor of the Gamow-Teller strength of 0.6. A precise half-life of 43.7 (6) ms was determined for ${}^{26}$P, the ${\hat{I}}^2$- (2)p decay mode of which is described.