Gamow-Teller (GT) transition is one of the most popular nuclear weak processes of spin-isospin (st) type. It is of interest not only in the study of nuclear physics, but also in astrophysics; it plays important roles, for examples, in supernova-explosion or nuclear synthesis. Relatively limited information can directly be obtained through the study of weak processes, such as b decay or neutrino induced reactions. However, it was found that (p, n) charge-exchange reactions at intermediate incoming energies (E > 100 MeV) and at 0° could selectively excite GT transitions, that extended the region of excitation energy of the study. With one-order-of-magnitude improvement of the energy resolution in (3He,t) measurements at 140 MeV/nucleon, fine structures of GT excitations, even those of GT giant resonances, can now be studied. Determination of GT transition strengths for pf-shell nuclei with astrophysical interest is discussed. We show that quantum number “isospin” plays important roles in such studies.
Note different date and time.