Rotational bands in ${}^{170}\mathrm{Yb}$ and ${}^{171}\mathrm{Yb}$ have been studied with the reactions ${}^{170}\mathrm{Er}(\alpha {,xn)}^{174-x}\mathrm{Yb}$ at 35 and 40 MeV. Considerable extensions have been made to the previously published level schemes, and new structures have been found in each nucleus. Angular correlation measurements and reduced transition probability $\left[B\right(M1:\overrightarrow{I}I-1)/B(E2:\overrightarrow{I}I-2\left)\right]$ ratios have been extracted. Detailed comparisons are made with the first major projected shell model calculations for excited bands in an odd-$N$ nucleus ${}^{171}\mathrm{Yb}$.

• Received 14 August 1997

DOI:https://doi.org/10.1103/PhysRevC.57.2924