Observation of the $\beta$-delayed $\gamma$-proton decay of ${}^{56}$Zn and its impact on the Gamow Teller strength evaluation

Abstract

We report the 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 nucleus ${}^{56}$Zn. Three $\gamma$-proton sequences have been observed after the $\beta$ decay. Here this decay mode, already observed in the $sd$-shell, is seen for the first time in the $fp$-shell. Both $\gamma$ 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.

Accepted for publication in PRL. (5 pages, 4 figures)

References in corpus (1)

• Study of beta-delayed 3-body and 5-body breakup channels observed in the decay of ^11Li

Cited by in corpus (14)

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• Beta decay of the exotic $T_z$ = -2 nuclei ${}^{48}$Fe, ${}^{52}$Ni and ${}^{56}$Zn
• Low-lying level structure of ${}^{56}$Cu and its implications on the rp process
• Beta decay of the very neutron-deficient ${}^{60}$Ge and ${}^{62}$Ge nuclei
• Shell model description of Gamow-Teller strengths in $pf$-shell nuclei
• $\beta$-particle energy-summing correction for $\beta$-delayed proton emission measurements
• ${}^{25}$Si ${\beta }^{+}$-decay spectroscopy
• Observation of the 2${}^{+}$ isomer in ${}^{52}$Co
• ${}^{57}$Zn $\beta$-delayed proton emission establishes the ${}^{56}$Ni $rp$-process waiting point bypass
• The beta decay of Tz=-2 64Se and its descendants: the T=2 isobaric multiplet
• $\beta$-decay spectroscopy of neutron-deficient nuclei
• Competition of $\beta$-delayed protons and $\beta$-delayed $\gamma$ rays in ${}^{56}$Zn and the exotic $\beta$-delayed $\gamma$-proton decay