Based on an axially symmetric rotor plus quasiparticles model, the study of the signature inversion (SI) in odd-odd nuclei in the mass region $A=160\mathrm{}$ is extended to include the region $A=80.\mathrm{}$ In spite of many differences between the two mass regions, the calculation results show that the possible SI mechanism, which has been confirmed by the calculation of odd-odd nuclei in the $A=160\mathrm{}$ region (i.e., the competition between the $n-p$ interaction and the Coriolis force in low-$K$ space) is also appropriate for odd-odd nuclei in the $A=80\mathrm{}$ region. This seems to indicate that there may be a universal mechanism of SI in odd-odd nuclei for different mass regions.

• Received 4 October 1999

DOI:https://doi.org/10.1103/PhysRevC.64.014313