Abstract
Excited states in the stable nucleus $^{193}\mathrm{Ir}$ have been investigated through an in-beam $\ensuremath{\gamma}$-ray spectroscopic technique following the $^{192}\mathrm{Os}$($^{7}\mathrm{Li}$, $\ensuremath{\alpha}2n$) reaction at a beam energy of 44 MeV. A level scheme built on the $\ensuremath{\pi}{h}_{11/2}$ isomer has been extended to high-spin states using eleven newly observed $\ensuremath{\gamma}$ transitions. The $\ensuremath{\pi}{h}_{11/2}$ band is proposed to be formed by coupling an ${h}_{11/2}$ proton to a core with large triaxial deformation. Three-quasiparticle states are suggested in $^{193}\mathrm{Ir}$ on referring to the similar states in $^{187}\mathrm{Ir}$. The features of signature splitting in the $\ensuremath{\pi}{h}_{11/2}$ bands of ${}^{187\ensuremath{-}193}$Ir are discussed with the help of total Routhian surface calculations.
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