Presently available relativistic and nonrelativistic effective interactions do not predict the same behavior for the isotope shifts in the Pb region. We analyze this difference and find that it is related to the characteristics of the spin-orbit term used in the parametrizations. We show that a simple modification of the spin-orbit contribution to the nonrelativistic Skyrme functional solves this problem. © 1995.
Reinhard, P. G., & Flocard, H. (1995). Nuclear effective forces and isotope shifts. Nuclear Physics, Section A, 584(3), 467–488. https://doi.org/10.1016/0375-9474(94)00770-N