Rotational structures in ${}_{}{}^{177}{}_{}{}^{}\mathrm{Ta}$

High-spin states in ${}_{}{}^{177}{}_{}{}^{}\mathrm{Ta}$ were produced using the ${}_{}{}^{170}{}_{}{}^{}\mathrm{Er}$${(}^{11}$B, 4n) reaction at 55 and 60 MeV. Considerable extensions have been made to the previously known level scheme, and new structures have been found. B(M1)/B(E2) ratios have been extracted for strongly coupled bands. The behavior of the different rotational cascades, in particular the anomalous crossing frequency observed in the [541]1/$2^{\mathrm{-}}$ proton ${\mathit{h}}_{9/2}$ band and the occurrence of ‘‘identical bands,’’ is discussed. Comparisons are made with projected shell model calculations.