Extended triaxial projected shell model approach for odd-neutron nuclei

In an effort to elucidate the rich band structures observed in odd-neutron systems, the triaxial projected shell model approach is extended to include three-quasineutron and five-quasiparticle configurations. This extension makes it possible to investigate the high-spin states up to and including the second band crossing. Detailed investigation has been performed for odd-mass Xe isotopes with the extended basis, and it is shown that the character of the band crossing along the yrast line changes with shell filling of the 1h11/2 orbital. Further, it is observed that the three-quasiparticle state that crosses the ground-state configuration, leading to the normal band crossing phenomenon along the yrast line, first crosses the ?? band based on the ground-state configuration at an earlier spin value. This crossing feature explains the occurrence of the signature inversion observed in the ?? bands for some of the studied isotopes.