RUBIO, B.; ORRIGO, S.E.A.; FUJITA, Y.; BLANK, Bertram; GELLETLY, W.; AGRAMUNT, J.; ALGORA, A.; ASCHER, P.; BILGIER, B.; CACERES, L.; CAKIRLI, R.B.; FUJITA, H.; GANIOGLU, 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.

doi:10.7566/JPSCP.6.020048

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JPS Conf. Proc., JPS Conf. Proc., 2014-06-01, Tokyo. 2015, vol. 6, p. 020048

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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 $T_z$ = -2 nucleus $^{56}$Zn. Three $\gamma$-proton sequences have been observed following the $\beta$ 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 $\gamma$ 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.< Leer menos

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Gamow-Teller transitions

Charge-exchange reactions

Isospin mixing

proton-rich nuclei

56Zn

Isospin symmetry

fragmentation of the IAS

-delayed -proton decay

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

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