Effective interactions and energy spectra for N = 28, 50, and 82 isotones

A tensor plus central potential is used to explore the universality of the effective interactions for N = 28, 50, and 82 isotones. It is found that the central components of the potential can be practically unified for the three mass regions. The tensor components are different for the three mass regions with the tendency of lesser importance for heavier nuclei. The energy spectra of the low-lying states of N = 28, 50, and 82 isotones are calculated and compared with experimental data