A superdeformed band was found in the nucleus ${}_{}{}^{150}{}_{}{}^{}\mathrm{Tb}$ following the reaction ${}_{}{}^{31}{}_{}{}^{}\mathrm{Sn}$ at 160 MeV. This is the first odd-odd nucleus in the mass 150 region where such a band has been found. Its observed properties do not differ significantly from those of other cases in this mass region. From a systematic study of this region, we have determined experimentally the contribution to the moment of inertia ${\mathrm{scrI}}^{\mathrm{}\left(2\right)\mathrm{}}$ in each of the last particles ion these nuclei. At present, this seems to us the best way to identify the orbitals occupied by these particles.

• Received 19 September 1988

DOI:https://doi.org/10.1103/PhysRevC.39.1651