Deep-inelastic reactions and $\gamma$-ray spectroscopy have been used to study excited states in ${}^{195}$Au. A three-quasiparticle isomer with a mean-life of 18.6(3) $\mu$s has been assigned at 2461+$\Delta$ keV, with decays into newly identified structures. Possible configurations for the isomer are discussed including a $J^{\pi }$  $=$31/2${}^{-}$ intrinsic state produced by coupling the 11/2${}^{-}$[505] proton hole to the 10${}^{+}$ state obtained from the 9/2${}^{+}$[624],11/2${}^{+}$[615] two-neutron holes, expected from configuration-constrained potential-energy-surface calculations. Residual interactions are evaluated within a semi-empirical shell model basis. New lifetime information is also obtained for the 21/2${}^{+}$ and 25/2${}^{+}$ states at 1813 and 1980 keV. The relationship between these and other newly identified states and the negative-parity states in the even-even neighbors is discussed.

• Received 21 December 2012

DOI:https://doi.org/10.1103/PhysRevC.87.014326