The nuclear structure of the odd ${}^{105}\mathrm{Mo}$ and ${}^{107}\mathrm{Mo}$ isotopes was reinvestigated in the present work. The excited levels of ${}^{105}\mathrm{Mo}$ were studied by observing prompt γ rays emitted after the spontaneous fission of ${}^{248}\mathrm{Cm}$ with the EUROGAM2 multidetector array. The already well-studied level structure of ${}^{107}\mathrm{Mo}$ was also completed by a search for microsecond isomers. For this purpose, this nucleus was produced by the thermal-neutron-induced fission reaction at the ILL reactor, in Grenoble. We have shown that the experimental level energies and the γ-decay patterns are well reproduced by simple particle-rotor calculations, assuming that these nuclei have an asymmetric shape. The shapes of the odd and even Mo are compared in the neutron range $N=62\text{−}66$.

• Received 3 July 2006

DOI:https://doi.org/10.1103/PhysRevC.74.064304