Gamow-Teller Transitions Studied in ([sup 3]He, t) Reaction and Analogous β decay

Abstract

Due to the simplicity of the σ τ operator that causes Gamow-Teller (GT) transitions, they are the most popular nuclear weak process in the Universe. The GT transitions in p f -shell nuclei, for example, starting from stable T z = +1 and proton-rich T z = −1 nuclei, where T z = (N − Z)/2, play important roles in the supernova-explosion or rp-process nucleosynthesis. In the β -decay study of p f -shell nuclei, half-lives can be measured rather accurately. On the other hand, in a high-resolution ( 3 He,t) charge-exchange reaction at 0 • , individual GT transitions up to high excitations can be studied. In order to derive reliable GT transition strengths B(GT), we present a unique analysis that combines the strength distribution form the ( 3 He,t) measurement with the information from the study of mirror β decay, where good isospin symmetry of T z = ±1 → 0 transitions is assumed.