Ground-state bands up to $8^{+}$ and negative-parity bands, in one case up to ${15}^{\mathrm{═}}$, have been established in ${}_{}{}^{190,192,194}{}_{}{}^{}\mathrm{Hg}$ using ($\alpha ,xn$) reactions. Corresponding bands have been observed in ${}_{}{}^{191,193}{}_{}{}^{}\mathrm{Hg}$ and are interpreted as Coriolis-decoupled bands.

• Received 5 February 1974

DOI:https://doi.org/10.1103/PhysRevLett.32.843