EFFECTS OF BOSON-FERMION MIXTURES IN PT ISOTOPES

Abstract

The Pt isotopes are studied in the boson-plus-fermion-pair model. The 1i13/2, 1h9/2 and 2f5/2 fermion orbitals are included in the model space. Isotopes quite near to the closed shells are included in the calculation. It was found that significant influences to the energy levels could be produced by the small mixtures from the fermion-pair configurations. The energy spectra and moment of inertia backbendings can be reproduced quite well. The calculated B(E2) values show prominent dips at the onsets of different fermion-pair configurations.