Abstract
A study of the superdeformed (SD) bands of Hg189-195 is carried out within the standard and the modified exponential models. The SD transition energy bands and moments of inertia and the models parameters for these bands are calculated within these two models. Comparison between these two models has been undertaken to implement their validity for these bands. The two models exhibit different behavior at high rotational angular frequency. Both models reproduce well the kinematic moments of inertia in this mass region. At high angular frequency the modified exponential model successfully reproduces the uprising and the down-turn of the dynamic moments of inertia of the studied SD bands.