Deformation Properties of the Neutron-Deficient Odd-A Pt and Hg Nuclei

Nuclear and atomic spectroscopy measurements have provided a great number of data on the neutron-deficient Pt and Hg nuclei. The odd- A Pt and Hg with A <186 have a prolate shape, and the even-even isotopes have a triaxial shape, while the nuclear shape of the odd- A Pt and Hg with A >186 is still an open question. The energy of the low-lying levels and the nuclear moments have been calculated in the framework of a semimicroscopic “axial-rotor + 1 quasiparticle” coupling model. The predictions are compared with the experimental data and discussed. The results strongly suggest a prolate shape for the negative-parity low-lying states of the odd- A 187–191 Pt and 187–193 Hg isotopes.