Competition between $β$-delayed proton and $β$-delayed $γ$ decay of the exotic $T_z$ = -2 nucleus $^{56}$Zn and fragmentation of the IAS
Language
en
Communication dans un congrès
This item was published in
JPS Conf. Proc., JPS Conf. Proc., 2014-06-01, Tokyo. 2015, vol. 6, p. 020048
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Gamow-Teller transitions
Charge-exchange reactions
Isospin mixing
proton-rich nuclei
56Zn
Isospin symmetry
fragmentation of the IAS
-delayed -proton decay
Origin
Hal imported