Empirical Proton-Neutron Interactions and Nuclear Density Functional   Theory: Global, Regional and Local Comparisons
  Calculations of nuclear masses, using nuclear density functional theory, are presented for even-even nuclei spanning the nuclear chart. The resulting binding energy differences can be interpreted in terms of valence proton-neutron interactions. These are compared globally, regionally, and locally with empirical values. Overall, excellent agreement is obtained. Discrepancies highlight neglected degrees of freedom and can point to improved density functionals. 
M. Stoitsov, R.B. Cakirli, R.F. Casten, W. Nazarewicz, W. Satula