Excited states and decay properties of ${}^{175}$Pt have been investigated using the ${}^{92}$Mo${(}^{86}\mathrm{Sr},2pn)$ fusion-evaporation reaction. The JUROGAM I $\gamma$-ray spectrometer and the GREAT spectrometer were used in conjunction with the gas-filled recoil separator RITU for the measurement of the radiation at the target and focal plane positions, respectively. Two new band structures, assigned to be based on the $I^{\pi }=\left({{}^7{/}_2}^{-}\right)$ ground state in ${}^{175}$Pt, have been established and the known yrast band has been extended up to $I^{\pi }=\left({{}^{49}{/}_2}^{+}\right)$. Rotational properties of the excited states in ${}^{175}$Pt have been investigated within the cranked shell-model formalism. The low-frequency changes in the alignments of the positive- and negative-parity bands are interpreted as a sign of proton-pair excitations in the rotating core. Furthermore, the $\alpha$-decay measurements reveal a candidate for a fourth $\alpha$-decay branch in ${}^{175}$Pt, feeding a non-yrast state in ${}^{171}$Os.

• Received 10 January 2014

DOI:https://doi.org/10.1103/PhysRevC.89.024316