Excited states of the neutron-deficient nucleus ${}^{175}\mathrm{Hg}$, populated using fusion-evaporation reactions, are reported for the first time. The spin and parity of the ground state has been determined to be $I^{\pi }=7/2^{-}$ through measurements of the $\alpha$ decay to the daughter nucleus ${}^{171}\mathrm{Pt}$. A structure based on an isomeric state [$T_{1/2}=0.34(3)\hspace{0.5em}\mu$s] with $I^{\pi }=13/2^{+}$ and its decay path to the ground state have been established. The observed structures are interpreted in terms of single-particle configurations, and the trends of coexisting shapes in neighboring nuclei are discussed.

• Received 14 April 2009

DOI:https://doi.org/10.1103/PhysRevC.79.051304