Comparison of potential models with the pp scattering data below 350 MeV

We calculate the ${\mathrm{\chi }}^2$ of various NN potential models with respect to the pp scattering data. We find that only the potential models which were explicitly fitted to the pp data give a reasonable description of these data. Most models give a pretty large ${\mathrm{\chi }}^2$ on the very low-energy pp data, due to incorrect ${}_{}{}^1{}_{}{}^{}$${\mathit{S}}_0$ phase shifts.