LACK OF ADDITIVITY IN MASS-190 SUPERDEFORMED BANDS

We investigate the independent quasiparticle picture for superdeformed nuclei of the mass-190 region, which is expected to lead to additivit y in certain physical quantities. Obvious deviations from additivity a re found from both experimental data and projected shell model calcula tions. The cause of the deviation can be decomposed and identified thr ough this model. Our study suggests that the independent quasiparticle picture may not be fully appropriate for this mass region.