Shell model based description of single-particle and collective excitations in 66Zn

Shell model calculations have been performed in f5/2pg9/2 model space using two different interactions viz., jj44bpn and jun45pn to explore the observed band like structure in 66Zn. Calculated energy values of the excited states are compared with the experimental values and a good agreement is found at low excitation energies. The experimental kinematic moment of inertia and the calculated values using shell model are compared and similar trend is observed. Also, the plotted values of the observed and theoretical alignment suggest very similar gain in the angular momentum of 66Zn. The nature of the variation of calculated energy with spin is very similar to the observation and shows a rotational like behaviour. Observed band crossing phenomenon is also reproduced from the plots of theoretical data points. Thus, these two effective interactions, without any modification, are quite efficient in producing the trend of the observed collectivity in even-even 66Zn nucleus. Configurations and occupation numbers for different states are obtained using the two aforementioned interactions and suggests substantial contribution of 1g9/2 orbital in generating the angular momentum of the high spin states.