Session W22 - High Spin Stakes.
MIXED session, Tuesday morning, May 02
102C,
Comparative studies of \pih_11/2\nuh_11/2 bands in odd-odd N=75 isotones were performed using collective nuclear models. Investigations were concentrated on the previously known yrast bands, as well as recently identified side bands built from the same configuration. The study was motivated by the observation of the energy-degenerate levels in ^134Pr, which possibly indicate dynamical chiral symmetry in rotating nuclei~[1]. Experimental Routhians for \pih_11/2\nuh_11/2 bands were found to be inconsistent with predictions of the Principal Axis Cranking (PAC) model. A phenomenological approach was developed based on a core-particle-hole coupling model to address the experimental observables. The model includes a triaxial core, single particle Hamiltonians, and quadrupole-quadrupole interactions; level energies and electromagnetic properties for odd-odd nuclei are calculated. Parameters of the model were adjusted to reproduce experimental results for ^132La. With this set of parameters, the model predicts the existence of degenerate levels at spins near \sim14\hbar for rigid rotational cores with \gamma \sim 30^\circ. Comparisons between experimental data presented in the previous abstract and these calculations will be discussed. [1 mm] [1]S.~Frauendorf and J.~Meng,~Nucl.~Phys.~A617~(1997)~131.