A comparison between different models for the isotopic differences in lead

Using the density-dependent Hartree-Foxk approach as a reference, the isotopic shifts in lead are computed for several models: particle-vibration-coupling-plus-doorway-dominance, improved Thomas-Fermi, and droplet model. It is found that they agree in their overall predictions provided the same effective interaction is used in all cases. The accuracy of their results for the changes in proton radii at the shell closure is discussed in detail.