The high-spin single-particle structure of 121I

The high-spin level structure of 121I has been established above the first yrast 'band termination state', which occurs at an excitation energy of 5.43 MeV with Ipi =39/2-, using data from the Eurogam array. The high-spin structure exhibits an irregular set of levels consistent with non-collective behaviour. A band terminating state at 9.24 MeV with Ipi =55/2- has been identified. Comparison with total Routhian surface cranking calculations suggest a maximally aligned ( pi h112/g72/2)(23/2-) (X)( nu h112/4)(16+) oblate configuration for this state relative to the 114Sn core.