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A very exotic decay mode at the proton drip-line, $\beta$-delayed$\gamma$-proton decay, has been observed in the $\beta$ decay of the $T_z$ = -2nucleus $^{56}$Zn. Three $\gamma$-proton sequences have been observed followingthe $\beta$ decay. The fragmentation of the IAS in $^{56}$Cu has also beenobserved for the first time. The results were reported in a recent publication.At the time of publication the authors were puzzled by the competition betweenproton and $\gamma$ decays from the main component of the IAS. Here we outlinea possible explanation based on the nuclear structure properties of the threenuclei involved, namely $^{56}$Zn, $^{56}$Cu and $^{55}$Ni, close to the doublymagic nucleus $^{56}$Ni. From the fragmentation of the Fermi strength and theexcitation energy of the two populated 0$^{+}$ states we could deduce theoff-diagonal matrix element of the charge-dependent part of the Hamiltonianresponsible for the mixing. These results are compared with the decay of$^{55}$Cu with one proton less than $^{56}$Zn. For completeness we summarisethe results already published.

Competition between $\beta$-delayed proton and $\beta$-delayed $\gamma$ decay of the exotic $T_z$ = -2 nucleus $^{56}$Zn and fragmentation of the IAS