Excited states in ${}^{109}\mathrm{Mo}$, populated in the spontaneous fission of ${}^{248}\mathrm{Cm}$, were studied using the EUROGAM2 array. Octupole deformation reported previously in ${}^{109}\mathrm{Mo}$ was not confirmed. Spin and parity of the ground state were changed. A new band found in this work suggests the ${5/2}^{+}$[402] neutron configuration for the ground state. In the 222.2 keV band, the 110.8 and 138.9 keV transitions are of M1 + E2 instead of E1 multipolarity, as reported previously. The 222.2 keV band is explained as the ${7/2}^{-}$[523] neutron configuration.

• Received 28 November 2005

DOI:https://doi.org/10.1103/PhysRevC.73.037302