The intruder orbitals in superdeformed bands and alignment additivity of odd–odd nuclei in the A∼190 region

Abstract The particle-number conserving (PNC) method for treating the cranked shell model with monopole and quadrupole pairing correlations is used to study the superdeformed (SD) bands observed in odd–odd nuclei in the A ∼ 190 mass region. Spins are assigned to the levels in these bands. The microscopic mechanism of the ℏω evolution of the dynamic moment of inertia J ( 2 ) for these SD bands are analyzed. In particular, the major roles of the j 15 / 2 neutron and i 13 / 2 proton orbitals played in the SD bands are investigated in detail by contributions to J ( 2 ) from each cranked orbital and interference terms between two cranked orbitals. Additivity in the A ∼ 190 mass region is investigated. The experimental evidence for additivity of alignments in 192 Tl can be reproduced by our calculations.