High-spin states in ${}_{}{}^{122}{}_{}{}^{}\mathrm{Cs}$ have been studied via the ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}$${(}^{12}$C,pn) reaction. Two ΔI=1 band structures, along with E2 crossover transitions, are observed. One band is believed to be based on the π${\mathit{h}}_{11/2}$⊗ν${\mathit{g}}_{7/2}$ configuration. A band crossing is observed at a rotational frequency of ħ${\mathrm{\omega }}_{\mathit{c}}$=0.46 MeV which is expected from the alignment of an ${\mathit{h}}_{11/2}$ neutron pair. The second band, believed to be based on the π${\mathit{g}}_{7/2}$⊗ν${\mathit{h}}_{11/2}$ configuration, is observed up to high spin. The two signatures of this negative parity band show a small signature splitting as well as a common upbend. Calculations with both the cranked shell model (CSM) and a geometrical model are utilized to define the configurations and quasiparticles corresponding to the band crossings in this nucleus.

• Received 7 February 1990

DOI:https://doi.org/10.1103/PhysRevC.41.2681