Signature Inversion in Odd-odd Nuclei in the Mass Region A 100 and the Influence of the Triaxial Shape

The model of an axially symmetric rotor plus two quasi-particles for the Signature Inversion (SI) in odd-odd nuclei is generalized to the calculation of two odd-odd nuclei l02Rh and 98Rh in the mass region A =100. The triaxial deformation is then introduced. The calculation result shows that the possible SI mechanism (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 = 100 region. A triaxial shape can improve the vibrational property of the rotational spectra remarkably.