We have recently performed a relativistic O(q4) chiral expansion of the two-pion exchange NN potential, and explored its configuration space content by fitting the theoretical expressions to parametrized simply formulas. In order to test the applicability of our parametrized potential, we studied the pion plus production in proton-neutron scattering at threshold an compare our results to the ones given by Reid 93 and v18 potentials. We shown that our results are very close to the v18 potential, which means that the potential is reliable and trustful.
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