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Nuclear structure; $\gamma$-band; even $Z$ even $N$ nuclei; soft rotor formula; softness parameter; moment of inertia.

The use of soft rotor formula (SRF) for the level energies of $K = 2 \gamma$ -band for the shape transitional even $Z$ even $N$ nuclei in the medium mass region is illustrated. With proper treatment, we obtained positive values of the moment of inertia and softness parameter, as opposed to negative values reported in literature. The moments of inertia of the $\gamma$-band are almost equal to the ground state band values. The systematic dependence of the softness parameter on energy ratio $R_{4/2}$ is studied. The effect of the odd–even spin staggering on these parameters is studied in detail. In deformed nuclei, the same parameters for odd and even spin members yield fair energy values.

J B Gupta¹ Satendra Sharma² Vikas Katoch³

1. Ramjas College, University of Delhi, Delhi 110 007, India
2. Panchwati Institute of Engineering & Technology, Meerut 250 005, India
3. Department of Physics, Singhania University, Jhunjhunu 333 515, India

Published

July 2013

Manuscript received

22 October 2012

Manuscript revised

7 March 2013

Accepted

26 March 2013