A rotational band, showing both signature components with a small energy splitting, has been identified in the doubly-odd ${}_{}{}^{138}{}_{}{}^{}\mathrm{Eu}$ nucleus via the ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$${(}^{50}$Cr,3pnγ) reaction. Both γ-γ and γ-n coincidence studies were employed. Comparisons with the lighter ${}_{}{}^{136}{}_{}{}^{}\mathrm{Pm}$, ${}_{}{}^{134}{}_{}{}^{}\mathrm{Pr}$, and ${}_{}{}^{132}{}_{}{}^{}\mathrm{La}$ isotones suggest a π$h_{11/2}$⊗ν$h_{11/2}$ structure.

• Received 26 July 1988

DOI:https://doi.org/10.1103/PhysRevC.38.2432