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Studying the weak nuclear response, especially the Gamow-Teller (GT) transitions starting from stable as well as unstable nuclei is one of the key issues in nuclear and nuclear-astrophysics. We studied the GT transitions by means of hadronic ( 3 He, t) charge-exchange reactions and complementary β decays. Owing to the simple στ nature of the operator that causes GT transitions, information on the crucial and critical part of the nuclear structure can be studied. Under the assumption that isospin is a good quantum number, symmetry is expected for the structure of mirror nuclei and the GT transitions starting from them. The results from β-decay studies and the strength distribution of GT transitions from the ( 3 He, t) reaction are compared and also combined for the understanding of nuclear structure of far-from-stability nuclei.

The results of a study of the beta decays of three proton-rich nuclei with Tz = -2, namely 48 Fe, 52 Ni and 56 Zn, produced in an experiment carried out at GANIL, are reported. In all three cases we have extracted the half-lives and the total β-delayed proton emission branching ratios. We have measured the individual β-delayed protons and β-delayed γ rays and the branching ratios of the corresponding levels. Decay schemes have been determined for the three nuclei, and new energy levels are identified in the daughter nuclei. Competition between β-delayed protons and γ rays is observed in the de-excitation of the T = 2 Isobaric Analogue States in all three cases. Absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. In addition, we discuss in detail the data analysis taking as a test case 56 Zn, where the exotic β-delayed γ-proton decay has been observed.