First observation of $\beta$-delayed $\gamma$-proton decay in the $T_z$ = -2, $^{56}$Zn nucleus
- ORRIGO, S. E. A.
- RUBIO, B.
- FUJITA, Y.
- BLANK, Bertram
- GELLETLY, W.
- AGRAMUNT, J.
- ALGORA, A.
- ASCHER, P.
- BILGIER, B.
- CACERES, L.
- CAKIRLI, R. B.
- FUJITA, H.
- GANIOĞLU, E.
- GERBAUX, M.
- GIOVINAZZO, J.
- GRÉVY, S.
- KAMALOU, O.
- KOZER, H. C.
- KUCUK, L.
- KURTUKIAN NIETO, T.
- MOLINA, F.
- POPESCU, L.
- ROGERS, A. M.
- SUSOY, G.
- STODEL, C.
- SUZUKI, T.
- TAMII, A.
- THOMAS, J.C.
Publication date
January 2014
DOI Publisher
American Physical Society (APS) Journal
Physical Review LettersAbstract
We report on the first experimental observation of a very exotic decay mode at the proton drip-line, the $\beta$-delayed $\gamma$-proton decay, clearly seen in the $\beta$ decay of the $T_z$ = -2, $^{56}$Zn nucleus. The $^{56}$Zn half-life and decay scheme have been determined. The decay proceeds by $\beta$-delayed proton emission and $\beta$-delayed $\gamma$ de-excitation. The exotic $\beta$-delayed $\gamma$-proton emission was also detected in three cases. It affects the usual determination of the Gamow-Teller (GT) strength. Absolute Fermi and GT strengths have been deduced. Evidence for fragmentation of the Fermi strength due to isospin mixing is found
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