APS : $\beta^-$ decay study of the $^{66}$Mn $-$ $^{66}$Fe $-$ $^{66}$Co $-$ $^{66}$Ni decay chain

Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around $^{68}\mathrm{Ni}$ represent an excellent study case, however, spectroscopic information of the neutron-rich, $Zl28$ nuclei is limited.