Levels in the odd-odd nucleus ${}^{100}\mathrm{Nb}$ situated at the edge of a region of especially fast shape transitions have been calculated in the framework of the interacting boson fermion fermion model. Levels observed in decay studies can be interpreted in a spherical basis. Low-lying $I^{\pi }{=8\mathrm{}}^{+}$ and ${10}^{-}$ states are predicted. Their relationship with the unplaced levels populated with a $12\hspace{0.5em}\mu \mathrm{s}$ delay after fission is discussed.

• Received 20 April 2000

DOI:https://doi.org/10.1103/PhysRevC.62.044304