Keywords: identical spectra, Xe-Gd nuclei, NpNn scheme, F-spin multiplets, low-spin identical bands, xenon, gadolinium
Search for low-spin identical bands in light Xe-Gd nuclei
The excitation energies of ground and gamma bands belonging to F
0spin multiplets of Xe-Gd nuclei are found to be constant. The pair conjugates nuclei with the same F-spin and ?F
0values also have identical N
nvalues. The smooth dependence of moment of inertia and function of valence proton and neutron number [f(N
n)] give the existence of low-spin identical bands in this region. A correlation ansatz to identify such nuclei based on the concepts of N
nand F-spin is also discussed.