Decay of mass-separatedI136to levels in theN=82nucleusXe136including neutron particle-hole states

A total of 142 $\gamma$ rays were observed in the decay of the 45- and 85-sec isomers of ${}_{}{}^{136}{}_{}{}^{}\mathrm{I}$ using an on-line isotope separator system. Of these, 116 were placed in a level scheme for ${}_{}{}^{136}{}_{}{}^{}\mathrm{Xe}$ consisting of 50 excited levels up to 6624 keV using results from Ge(Li) $\gamma$ singles and $\gamma \gamma$-coincidence measurements. Our results are compared with results from earlier decay and reaction experiments, and the levels below 2.8 MeV are compared with predictions of recent shell-model calculations. Strong $\beta$ population was observed to states above 3.5 MeV which are interpreted as neutron particle-hole states.