Identification of theν7/2+[404]band in neutron-richRu109

The high-spin spectroscopy of neutron-rich $^{109}\mathrm{Ru}$ is studied by measuring the prompt \ensuremath{\gamma} rays from the spontaneous fission fragments of $^{252}\mathrm{Cf}$ with 102 Compton-suppressed Ge detectors in the Gammasphere detector array. Previous band structures are confirmed and the ground state band is extended. A positive parity band based on a 332.5 keV level is newly identified. This band is proposed as a single-neutron excitation band built on the $7/{2}^{+}[404]$ Nilsson orbital. Some band structural characteristics are discussed.