# Competition between β-delayed proton and β-delayed γ decay of the exotic Tz = −2 nucleus $^{56}$Zn and fragmentation of the IAS

Abstract : A very exotic decay mode at the proton drip-line, β-delayed γ-proton decay, has been observed in the β decay of the Tz = −2 nucleus $^{56}$Zn. Three γ-proton sequences have been observed following the β decay. The fragmentation of the IAS in $^{56}$Cu has also been observed for the first time. The results were reported in a recent publication. At the time of publication the authors were puzzled by the competition between proton and γ decays from the main component of the IAS. Here we outline a possible explanation based on the nuclear structure properties of the three nuclei involved, namely $^{56}$Zn, $^{56}$Cu, and $^{55}$Ni, close to the doubly magic nucleus $^{56}$Ni. From the fragmentation of the Fermi strength and the excitation energy of the two populated 0+ states we could deduce the off-diagonal matrix element of the charge-dependent part of the Hamiltonian responsible for the mixing. These results are compared with the decay of $^{55}$Cu with one proton less than $^{56}$Zn. For completeness we summarise the results already published.
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Conference papers

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Contributor : Michel Lion <>
Submitted on : Friday, September 11, 2015 - 10:03:34 AM
Last modification on : Tuesday, July 24, 2018 - 10:24:01 AM

### Citation

B. Rubio, S.E.A. Orrigo, Y. Fujita, B. Blank, W. Gelletly, et al.. Competition between β-delayed proton and β-delayed γ decay of the exotic Tz = −2 nucleus $^{56}$Zn and fragmentation of the IAS. ARIS 2014 - Advances in Radioactive Isotope Science, Jun 2014, Tokyo, Japan. pp.020048, ⟨10.7566/JPSCP.6.020048⟩. ⟨in2p3-01197073⟩

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