2 QUASI-PARTICLES PLUS ROTOR MODEL CALCULATION FOR ODD-ODD NUCLEI IN THE A=160 REGION

The axially symmetric rotor plus quasiparticle model for an odd nucleu s is generalized to the odd-odd nucleus and special attention is paid to the model basis accounting for gamma vibration perturbation around axial symmetry. The method presented in this paper is used for a numbe r of realistic nuclei in the A=160 mass region. Two slightly different calculation schemes are put into practice. The first calculation give s results in qualitative agreement with experiments and the second cal culation provides remarkable improvements to the first. A possible exp lanation bf the mechanism for signature inversion Of odd-odd nuclei is discussed.