Beta decay of the exotic Tz = -2 nuclei 48Fe, 52Ni and 56Zn

Orrigo, S. E. A. and Rubio, B. and Fujita, Y. and Gelletly, W. and Agramunt, J. and Algora, Alejandro and Ascher, P. and Bilgier, B. and Blank, B. and Cáceres, L. and Cakirli, R. B. and Ganioǧlu, E. and Gerbaux, M. and Giovinazzo, J. and Grévy, S. and Kamalou, O. and Kozer, H. C. and Kucuk, L. and Kurtukian-Nieto, T. and Molina, F. and Popescu, L. and Rogers, A. M. and Susoy, G. and Stodel, C. and Suzuki, T. and Tamii, A. and Thomas, J. C. (2016) Beta decay of the exotic Tz = -2 nuclei 48Fe, 52Ni and 56Zn. PHYSICAL REVIEW C, 93 (4). ISSN 2469-9985

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Abstract

The results of a study of the β decays of three proton-rich nuclei with Tz=-2, namely Fe48,Ni52, and Zn56, 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 analog 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 Zn56, where the exotic β-delayed γ-proton decay has been observed.

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