Abstract
We address the problem of pion production in low-energy -nucleus collisions. For the production mechanism, we assume a simple model consisting of a coherent sum of single pion exchange and the excitation—followed by the decay into two pions and a nucleon—of the resonance. The production amplitude is modified by the final state interaction between the pions calculated using the chirally improved Jülich meson exchange model including the polarization of the nuclear medium by the pions. The model reproduces well the experimentally observed cross sections, especially the enhancement with increasing A of the mass distribution in the threshold region.
- Received 2 October 1998
DOI:https://doi.org/10.1103/PhysRevC.59.R1237
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