Dominance of thei132Neutron in Yb Backbending

Abstract

Two decoupled rotational bands in ${}_{}{}^{165}{}_{}{}^{}\mathrm{Yb}$ are observed in (heavy ion, $\mathrm{xn}$) experiments. The $i_{\frac{13}{2}}$ band does not backbend, whereas the $h_{\frac{9}{2}}$ band does. This provides strong evidence that only $i_{\frac{13}{2}}$ neutrons contribute to backbending in this region.