Abstract
The Gamow-Teller (GT) transition is one of the most popular nuclear weak processes of the spin-isospin ( στ) type. It is of interest not only in nuclear physics, but also in astrophysics; it plays important roles, for example, in supernova-explosions or nuclear synthesis. Relatively limited information can be obtained directly through the study of weak processes themselves. However, it was found that charge-exchange (CE) reactions at intermediate incoming energies at 0° selectively excite GT transitions, which could extend the energy region of the study. With an improvement of the energy resolution in ( 3He, t) CE measurements, 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 the quantum number “isospin” plays important roles in such studies.
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