The $\pi h_{11/2}\otimes \nu h_{11/2}$ yrast band in the odd-odd nucleus ${}^{140}\mathrm{Tb}$ has been populated by the ${}^{92}\mathrm{Mo}$ ${(}^{54}\mathrm{Fe},$ $\alpha pn)$ reaction at 240-MeV incident beam energy. No previous spectroscopic information was known in this nucleus. The present data fit nicely in the systematics of the $N=75\mathrm{}$ isotones of La, Pr, Pm, Eu, and Tb $(Z=57\mathrm{}$ to 65).

• Received 13 April 2000

DOI:https://doi.org/10.1103/PhysRevC.62.027302