Quadrupole Pairing Interaction and Signature Inversion

Abstract

The signature inversion in the πh11/2 \otimes νh11/2 rotational bands of odd-odd Cs and La isotopes and the πh11/2 \otimes νi13/2 bands of odd-odd Tb, Ho and Tm nuclei is investigated using pairing and deformation self consistent mean field calculations. The model can rather satisfactorily account for the anomalous signature splitting, provided that spin assignments in som of the bands are revised. Our calculations show that signature inversioncan appear already at axially symmetric shapes. It is found that this is due to the contribution of the λμ=22 component of the quadrupole pairing interaction to the mean field potential.