The neutron-rich isotopes ${}^{65,67}\mathrm{Fe}$ and ${}^{65}\mathrm{Co}$ have been produced at the LISOL facility, Louvain-La-Neuve, in the proton-induced fission of ${}^{238}\mathrm{U}$. Beams of these isotopes have been extracted with high selectivity by means of resonant laser ionization combined with mass separation. Yrast and near-yrast levels of ${}^{65}\mathrm{Co}$ have also been populated in the ${}^{64}\mathrm{Ni}+{}^{238}\mathrm{U}$ reaction at Argonne National Laboratory. The level structure of ${}^{65}\mathrm{Co}$ could be investigated by combining all the information from both the ${}^{65}\mathrm{Fe}$ and ${}^{65}\mathrm{Co}\beta$ decay and the deep-inelastic reaction. The ${}^{65}\mathrm{Fe}$, ${}^{65}\mathrm{Co}$, and ${}^{67}\mathrm{Fe}$ decay schemes and the ${}^{65}\mathrm{Co}$ yrast structure are fully established. The ${}^{65,67}\mathrm{Co}$ level structures can be interpreted as resulting from the coexistence of core-coupled states with levels based on a low-energy proton-intruder configuration.

• Received 21 January 2009

DOI:https://doi.org/10.1103/PhysRevC.79.044309