Description of moments of inertia of superdeformed bands using two and three parameter models in <i>A</i> ≈ 60–90 mass region

The Variable moment of inertia (VMI) model and its extension based on Nuclear Softness (VMINS3) concept with three parameters have been applied to comprehend the systematic of the superdeformed rotational bands (SDRB) in [Formula: see text]–90 lower mass region. The band head spin has been assigned to all superdeformed (SD) bands used in the present manuscript using VMI model and VMINS3 model. The experimental transition energies have been least square fitted to obtain parameters of the model. The variation of the experimental kinematic moment of inertia [Formula: see text] and dynamic moment of inertia [Formula: see text] against the [Formula: see text] product are examined in [Formula: see text]–90 lower mass region. In addition, the comparison between experimental and calculated [Formula: see text] is drawn out against rotational frequency [Formula: see text] and the variation of band head moment of inertia [Formula: see text] with softness parameter [Formula: see text] is also examined.