A new in-beam study in ${}_{}{}^{183}{}_{}{}^{}\mathrm{Hg}$ levels has been carried out by using the ${}_{}{}^{155}{}_{}{}^{}\mathrm{Gd}$${(}^{32}$S,4n) reaction at a beam energy of 160 MeV. A new pair of signature-partner bands, with large signature splitting, has been established in ${}_{}{}^{183}{}_{}{}^{}\mathrm{Hg}$. The band head of these signature-partner bands is assigned to be the ground state of ${}_{}{}^{183}{}_{}{}^{}\mathrm{Hg}$ with a configuration of 1/$2^{\mathrm{-}}$[521]. The measured ratios of directional correlations (DCO ratios) revealed decay patterns for the proposed 9/$2^{+}$[624] bands in ${}_{}{}^{183}{}_{}{}^{}\mathrm{Hg}$ different from those of ${}_{}{}^{185}{}_{}{}^{}\mathrm{Hg}$.

• Received 16 November 1994

DOI:https://doi.org/10.1103/PhysRevC.51.1720