Observation of the beta-delayed gamma-proton decay of 56Zn and its impact on the Gamow-Teller strength evaluation.

Orrigo, S. E. A. and Rubio, B. and Fujita, Y. and Blank, B. and Gelletly, W. and Agramunt, J. and Algora, Alejandro and Ascher, P. and Bilgier, B. and Cáceres, L. and Cakirli, R. B. and Fujita, H. and Ganioglu, 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. (2014) Observation of the beta-delayed gamma-proton decay of 56Zn and its impact on the Gamow-Teller strength evaluation. PHYSICAL REVIEW LETTERS, 112 (22). ISSN 0031-9007

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Abstract

We report the observation of a very exotic decay mode at the proton drip-line, the β-delayed γ-proton decay, clearly seen in the β decay of the Tz = -2 nucleus 56Zn. Three γ-proton sequences have been observed after the β decay. Here this decay mode, already observed in the sd-shell, is seen for the first time in the f p-shell. Both γ and proton decays have been taken into account in the estimation of the Fermi (F) and Gamow Teller (GT) strengths. Evidence for fragmentation of the Fermi strength due to strong isospin mixing is found.

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