The level scheme of ${}^{190}\mathrm{Au}$ was extended up to high spin using $\gamma$ spectroscopy with the Eurogam-II array and internal conversion measurements with the electron-$\gamma$ spectrometer of Orsay. Several sets of rotation-aligned bands were found and associated with high-$j$, low-$K$ configurations. According to the total Routhian surface and cranked shell model calculations these bands are caused by the nonaxiality of the nuclear deformation $\left(\gamma ⩽-70°\right)$. Furthermore, very good agreement was obtained between the experimental data and the theoretical predictions for the properties of these bands, such as alignments, band-crossing frequencies, and signature inversion, thus supporting the suggested nonaxial shapes.

• Received 14 January 2004

DOI:https://doi.org/10.1103/PhysRevC.69.044320