The nuclear S-wave pion production is described by the axial charge density operator of the two-nucleon systen. It is shown that the short range axial exchange charge operator implied by the nucleon-nucleon interaction enhances the predicted cross section for the reaction pp→pp near threshold by factors 3–5. This suffices to explain most of the underprediction obtained with the single-nucleon and S-wave pion rescattering operator. The result implies that the cross section for pp→pp can provide direct information on the short range components of the nucleon-nucleon interaction.
- Received 30 November 1992
- Published in the issue dated 12 April 1993
© 1993 The American Physical Society