Total routhian surface calculations on Hf isotopes

The two-dimensional total routhian surface calculations have been carried out to study the triaxial superdeformed structure of a neutron-rich nucleus Hf-173 firstly. In particular the effects of the rotational frequency omega and pairing-energy gap parameter Delta are discussed in detail in the course of shaping its triaxial superdeformation; additionally the neutron-shell correction energy is analyzed with emphasis in the confirmed triaxial superdeformed nucleus Hf-173. Finally, more systematical results have been investigated for some confirmed superdeformed nuclei experimentally and a few predicted triaxial superdeformed nuclei theoretically with quadropole deformation epsilon(2) approximate to 0.4 and triaxial deformation gamma approximate to 20 degrees or 30 degrees in the Z = 72 region.