Coulomb effects in three-nucleon scattering versus charge-symmetry breaking in the3Pnucleon-nucleon interactions

Comparison of data for neutron-deuteron and proton-deuteron analyzing power ${\mathit{A}}_{\mathit{y}}$ for elastic scattering has become crucial for investigating charge-symmetry breaking in the ${}_{}{}^3{}_{}{}^{}$P nucleon-nucleon interactions. We extended this comparison down to 5 MeV and find that the relative difference between n-d and p-d scattering at the ${\mathit{A}}_{\mathit{y}}$ maximum near 120° increases with decreasing energy. By applying a straightforward Coulomb ‘‘correction’’ to the p-d data, we account for most of the difference, suggesting that the Coulomb force, rather than charge-symmetry breaking, is responsible for most of the observed difference.