High-spin states have been populated in odd-odd ${}_{}{}^{186,188}{}_{}{}^{}\mathrm{Au}$ via the heavy-ion ${}_{}{}^{171,173}{}_{}{}^{}\mathrm{Yb}$${(}^{19}$F,4n) reactions at 93–94 MeV. Rotational bands built on ${11}^{\mathrm{-}}$ oblate ν${\mathit{i}}_{13/2}^{\mathrm{-}1}$⊗π${\mathit{h}}_{11/2}^{\mathrm{-}1}$ structures have been observed in both nuclei, similar to those reported in ${}_{}{}^{190\mathrm{-}194}{}_{}{}^{}\mathrm{Au}$. Two new strongly coupled bands in ${}_{}{}^{186}{}_{}{}^{}\mathrm{Au}$ are interpreted as prolate π${\mathit{h}}_{9/2}$⊗ν${\mathit{i}}_{13}$2 and π${\mathit{i}}_{13/2}$⊗ν${\mathit{i}}_{13/2}$ configurations. Based on blocking arguments a band crossing in the latter structure is attributed to the alignment of ${\mathit{h}}_{9/2}$ protons. Measured B(M1;I→I-1)/B(E2;I→I-2) ratios are compared to predictions of the Dönau and Frauendorf geometrical formalism extended to odd-odd cases.

• Received 8 March 1991

DOI:https://doi.org/10.1103/PhysRevC.45.613