Transition strengths in the mirror nuclei 27Si-27Al

Abstract

Mean lifetimes of levels in the mirror nuclei 27 Si and 27 Al have been measured using the Doppler-shift-attenuation (DSA) method and the reactions 12 C( 16 O, n) 27 Si and 12 C( 16 O, p) 27 Al. The lifetime values or limits were determined for 14 levels in 27 Si and 7 levels in 27 Al. For the effective stopping of recoils, the targets were prepared by implanting 12 C into Ta backings. The Monte Carlo method and the experimental stopping power were used in the DSA analysis. The strengths of the analogue transitions are discussed.