In-beam γ Spectroscopy of Neutron-rich $^{63,65,67}$Mn

International audience; The excited states in $^{63,65,67}$Mn have been studied via in-beam \begin{document}$\gamma$\end{document}-ray spectroscopy following the knockout reaction of $^{68}$Fe by bombarding a liquid hydrogen target. Similar level schemes have been established for the three isotopes, and the level schemes consist of the 11/2$^{–}$, 9/2$^{–}$, 7/2$^{–}$ and 5/2$_{g.s.}^{–}$ states, which are connected by \begin{document}$\Delta I = 1$\end{document}. The level sequences of $^{65,67}$Mn show features of strongly coupled rotational band with \begin{document}$K^{\pi} = 5/2^{-}$\end{document} expected for the well deformed nuclei. Large-scale shell-model calculations using the modified LNPS (LNPSm) effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole (\begin{document}$4p-4h$\end{document}) neutron configurations and 1-particle-1-hole (\begin{document}$1p-1h$\end{document}) proton configurations for all the states. The experimental results show an enhancement of Urca neutrino cooling in the accreted neutron crust associated with \begin{document}$A = 63$\end{document} nuclei and rule out significant cooling from \begin{document}$A = 65,67$\end{document}.