Ponente
Descripción
$^{78}$Ni is now being understood as a doubly magic nucleus [R. Taniuchi et al., Nature 569, 53 (2019)]. Moreover, from the experimental findings this nucleus may have a deformed excited state, which is strongly related to shape coexistence. Unfortunately, however, it is still extremely difficult to directly investigate not only this $^{78}$Ni but also $^{79}$Ni and $^{79}$Cu for more spectroscopic information. Moreover, recent theoretical works predict a new island of inversion at N = 50 below $^{78}$Ni. Therefore, it is of great importance to investigate the N = 50 isotones, and $^{80}$Zn is one of the key nuclei playing a crucial role in this feature.
Currently, the internal level scheme of $^{80}$Zn is limited to the ground band structure. Some excited states were observed, but the exact spins and parities could not be firmly determined. From this proposal, therefore, we aim to measure the excited states, in particular the $2^{+}_{2}$ and $0^{+}_{2}$ states in $^{80}$Zn through the $\beta$-delayed $\gamma$-ray spectroscopy of $^{80}$Cu. The successful measurement will expand our understanding of shell structure along N = 50 and further develop the shell model calculation to predict the possible island of inversion at N = 50 below $^{78}$Ni.
