  The parameters of the UNEDF2 nuclear energy density functional (EDF) model
were obtained in an optimization to experimental data consisting of nuclear
binding energies, proton radii, odd-even mass staggering data, fission-isomer
excitation energies, and single particle energies. In addition to parameter
optimization, sensitivity analysis was done to obtain parameter uncertainties
and correlations. The resulting UNEDF2 is an all-around EDF. However, the
sensitivity analysis also demonstrated that the limits of current Skyrme-like
EDFs have been reached and that novel approaches are called for.
