The absorption of on He in the region is evaluated with exact inclusion of the final state interaction among the three emerging protons. The absorption is described by a vertex and an - transition matrix which are calculated from a phenomenological model for and reactions. In a calculation where the initial pion scattering effects are neglected, the predicted peaks of the pion absorption cross sections for H and He lie too high in energy in relation to the data. The effect of the final-state three-nucleon interaction turns out to be too small for changing the magnitude and shifting the peak position of the total absorption cross section for He. We demonstrate that the adjustment of the peak position for the deuteron cross section by small modifications of the parameters automatically leads to the correct peak position in He.
- Received 18 December 1996
- Published in the issue dated May 1997
© 1997 The American Physical Society