Abstract
The reactions (,pp)p and (,pn)n were studied at 37.0 MeV by coincidence detection of two nucleons. The differential cross sections were separated to two-nucleon (), three-nucleon (), and final-state interaction () components. For , the angular distribution is symmetric about 90°, and the total cross section is 1.5 times the cross section measured for d(,pp). For , the angular distribution is asymmetric (backward peaked). The asymmetry increases with decreasing energy, indicating increasing pion s-wave contribution at lower energies. The fraction of the cross section induced by s-wave pions as calculated by a partial wave amplitude analysis is 13%. The measured total cross sections are ()=0.85±0.08 mb and ()=7.9±0.5 mb; ()=1.6±0.7 mb and ()=1.3±0.3 mb. A new evaluation of at =62.5 and 82.8 MeV is given, using data from an earlier experiment. The cross sections leading to the two-nucleon final-state interaction at =37.0 MeV are also estimated. © 1996 The American Physical Society.
- Received 5 December 1994
DOI:https://doi.org/10.1103/PhysRevC.53.1074
©1996 American Physical Society