Gamow–Teller transitions in exotic pf-shell nuclei relevant to supernova explosion

Gamow-Teller (GT) transitions starting from unstable pf-shell nuclei are of interest not only in nuclear physics, but also in astrophysics, e. g. in violent neutrino induced reactions at the core-collapse stage of type II supernovae. In the beta-decay study of these pf-shell nuclei, half-lives can be measured rather accurately. On the other hand, in high-resolution (He-3, t) charge-exchange reactions at 0 degrees, individual GT transitions up to high excitations can be studied. Assuming the isospin symmetry for the strengths of T-z = +/- 1 -> 0 analogous GT transitions, we present a unique 'merged analysis' for the determination of absolute B(GT) values.