Rotational bands in170Yband171Yband the projected shell model

Abstract

Rotational bands in ${}^{170}\mathrm{Yb}$ and ${}^{171}\mathrm{Yb}$ have been studied with the reactions ${}^{170}\mathrm{Er}(\ensuremath{\alpha}{,xn)}^{174\ensuremath{-}x}\mathrm{Yb}$ 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 $[B(M1:\stackrel{\ensuremath{\rightarrow}}{I}I\ensuremath{-}1)/B(E2:\stackrel{\ensuremath{\rightarrow}}{I}I\ensuremath{-}2)]$ ratios have been extracted. Detailed comparisons are made with the first major projected shell model calculations for excited bands in an odd-$N$ nucleus ${}^{171}\mathrm{Yb}$.