PARTICLE-ROTOR MODEL ANALYSIS OF LOW-SPIN IDENTICAL BANDS IN NEIGHBORING ODD-A AND EVEN-EVEN NUCLEI

A conventional particle-rotor model calculation has been performed for a number of odd-A rare earth nuclei in the mass region A congruent-to 160-190. A detailed analysis of the results of the calculation has be en made. It shows that the positive parity bands which exhibit identic al dynamical moments of inertia with their even-(A - 1) neighbors are not at all perturbed by the Coriolis interaction. On the other hand, t he positive parity bands which are appreciably perturbed by the Coriol is interaction show ''normal'' behavior. This feature essentially poin ts out that the core is not polarized in presence of the unpaired vale nce proton. In case of the negative parity bands, an interesting featu re is observed. For most of them, which show identical band behavior, agreement with experimental spectra can be achieved with reasonable va lues of Coriolis attenuation factor only if their neighboring (A + 1) even nuclei are used as cores.