Systematic study of kinematic and dynamic moment of inertia of SD bands in A=150 mass region

The significance of the proton-neutron interaction in deducing expansion of nuclear structure was stressed earlier by de - Shalit and Goldhaber. Talmi was the first to notice that the proton-neutron (p-n) interaction is responsible for deformed nuclei. Federman and Pittel highlighted the p-n interaction between nucleons in spin-orbit partner orbits; which results in rapid phase transition near A=100. Similar mechanism has been applied to A=150 mass region on the account of Z=64 subshell closure. Casten proposed a simple quantity, N_pN_n; which is an estimation for the residual proton-neutron which plays a crucial role in evolution of nuclear deformation. A simple pattern observed whenever the nuclear data relating to nuclear deformation is plotted against N_pN_n