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Background: Shell evolution can impact the structure of the nuclei and leadto effects such as shape coexistence. The nuclei around $^{68}$Ni represent anexcellent study case, however, spectroscopic information of the neutron-rich,$Z<28$ nuclei is limited. Purpose: The goal is to measure $\gamma$-raytransitions in $^{66}$Fe, $^{66}$Co and $^{66}$Ni populated in the $\beta^-$decay of $^{66}$Mn, to determine absolute $\beta$-feedings and relative$\gamma$-decay probabilities and to compare the results with Monte Carlo ShellModel calculations in order to study the influence of the relevant singleneutron and proton orbitals occupancies around $Z=28$ and $N=40$. Method: Thelow-energy structures of $^{65,66}$Fe, $^{66}$Co and $^{66}$Ni were studied inthe $\beta^-$ decay of $^{66}$Mn produced at ISOLDE, CERN. The beam waspurified by means of laser resonance ionization and mass separation. The$\beta$ and $\gamma$ events detected by three plastic scintillators and twoMiniBall cluster germanium detectors, respectively, were correlated in time tobuild the low-energy excitation schemes and to determine the $\beta$-decayhalf-lives of the nuclei. Results: The relative small $\beta$-decay groundstate feeding of $^{66}$Fe obtained in this work is at variant to the earlierstudies. Spin and parity $1^+$ was assigned to the $^{66}$Co ground state basedon the strong ground state feeding in the decay of $^{66}$Fe as well as in thedecay of $^{66}$Co. Experimental log(ft) values, $\gamma$-ray deexcitationpatterns and energies of excited states were compared to Monte Carlo ShellModel calculations. Based on this comparison, spin and parity assignments forthe selected number of low-lying states in the $^{66}$Mn to $^{66}$Ni chainwere proposed. Conclusions: The $\beta$-decay chain starting $^{66}$Mn towards$^{66}$Ni, crossing $N=40$, evolves from deformed nuclei to sphericity...

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