Isospin Dependence of the Spin-Orbit Force and Effective Nuclear Potentials

The isospin dependence of the spin-orbit potential is investigated for an effective Skyrme like energy-functional suitable for density-dependent Hartree-Fock calculations. The magnitude of the isospin dependence is obtained from a fit to experimental data on finite spherical nuclei. It is found to be close to that of relativistic Hartree models. Consequently the anomalous kink in the isotope shifts of Pb nuclei is well reproduced.