Abstract
Excited states in have been identified for the first time using the fusion evaporation reaction. rays were detected using the JUROGAM -ray spectrometer and recoil discrimination was achieved using the recoil ion transport unit (RITU) gas-filled separator in conjunction with the GREAT spectrometer situated at the focal plane of the RITU. The yrast states are assigned to a strongly coupled rotational band based on a configuration. This structure exhibits large signature splitting at low spins that disappears after the paired band crossing because of the alignment of a pair of neutrons. This effect is ascribed to triaxial shape changes induced by the core-polarizing properties of the deformation-aligned proton and the rotation-aligned neutrons. Two additional strongly coupled band structures have been established and are discussed in terms of octupole-vibrational and two-quasiparticle excitations built on the yrast structure. The experimental results are compared with predictions from cranked-shell-model and total-Routhian-surface calculations.
2 More- Received 12 May 2009
DOI:https://doi.org/10.1103/PhysRevC.80.054316
©2009 American Physical Society