High-spin states have been studied in the very neutron deficient N=74 nucleus, ${}_{}{}^{136}{}_{}{}^{}\mathrm{Sm}$ with the reaction ${}_{}{}^{107}{}_{}{}^{}\mathrm{Ag}$${(}^{32}$S,p2n${)}^{136}$Sm. Using time-correlated charged-particle–γ–γ spectroscopy, a rotational cascade built upon the ${\mathit{t}}_{1/2}$=15 μs, ${\mathit{K}}^{\mathrm{\pi }}$=$8^{\mathrm{-}}$ isomer has been identified. Although equivalent isomers are known in other N=74 isotones, this represents the only case where the associated band has been observed. The in-band decay properties of this structure are consistent with a 7/$2^{+}$[404]⊗9/$2^{\mathrm{-}}$[514] two quasineutron assignment. A second high-K band, probably of a four-quasiparticle nature, is observed to feed into the ${\mathit{K}}^{\mathrm{\pi }}$=$8^{\mathrm{-}}$ band.

• Received 31 October 1994

DOI:https://doi.org/10.1103/PhysRevC.51.1745