Rotational bands and neutron alignments in neutron rich odd-Acadmium isotopes

High-spin states in ${}_{}{}^{109,111}{}_{}{}^{}\mathrm{Cd}$ have been investigated with the reaction ${}_{}{}^{96}{}_{}{}^{}\mathrm{Zr}$ ${(}^{18}$O,xn${)}^{114\mathrm{-}\mathit{x}}$Cd at beam energies of 60 and 70 MeV. The decoupled yrast bands observed in both nuclei are interpreted as being built upon a low-Kh11/2-quasineutron configuration. Both structures exhibit band crossings corresponding to the rotational alignment of a pair of h11/2 quasineutrons. Two positive-parity bands built on a g7/2-quasineutron configuration are observed in ${}_{}{}^{109}{}_{}{}^{}\mathrm{Cd}$. These exhibit a signature inversion in the region of the first (ν${\mathit{h}}_{11/2)}^2$ alignment. This may be associated with some softness to triaxiality. The results are discussed in terms of the cranked shell model, total Routhian surface calculations, and the systematics of neighboring nuclei.