Shape coexistence inAu187

The level structure of odd-proton ${}_{}{}^{187}{}_{}{}^{}\mathrm{Au}$ was studied using the ${}_{}{}^{172}{}_{}{}^{}\mathrm{Yb}$ ${(}^{19}$F,4n) reaction. Gamma-gamma coincidence, angular distributions and γ-γ-time measurements were used to establish the energies, spins, parities, and lifetimes for the states in the decay scheme of ${}_{}{}^{187}{}_{}{}^{}\mathrm{Au}$. Both prolate and oblate structures have been established. The prolate bands are built on the π$h_{9/2}$ (α=±(1/2) and the π$i_{13/2}$ (α=(1/2) particle states. An oblate, strongly coupled band built on a 90±10 ns isomeric state is reported for the first time. A second oblate structure built on the $h_{11/2}$ proton-hole state was established to much higher spin than before. The backbend present in the π$i_{13/2}$ band has been interpreted as the alignment of a pair of $h_{9/2}$ protons.