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First observation of $\beta$-delayed $\gamma$-proton decay in the $T_z$ = -2, $^{56}$Zn nucleus

Abstract : 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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http://hal.in2p3.fr/in2p3-00939876
Contributor : Michel Lion <>
Submitted on : Friday, January 31, 2014 - 8:40:01 AM
Last modification on : Friday, November 27, 2020 - 6:02:05 PM

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S. E. A. Orrigo, B. Rubio, Y. Fujita, Bertram Blank, W. Gelletly, et al.. First observation of $\beta$-delayed $\gamma$-proton decay in the $T_z$ = -2, $^{56}$Zn nucleus. Physical Review Letters, American Physical Society, 2014, 112, pp.939876. ⟨10.1103/PhysRevLett.112.222501⟩. ⟨in2p3-00939876⟩

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