INCLUSIVE AND EXCLUSIVE PRODUCTION OF ETA MESONS BY PIONS

Inclusive and exclusive (pi, eta) reactions are studied in the framework of a momentum space DWIA model. It is assumed that both reactions are dominated by formation of an N(1535) resonance. Medium corrections for the self-energy of the intermediate N* are taken into account. Cross sections are calculated for (pi+, eta) inclusive reactions on C-12 and compared with experiment And with existing theoretical calculations. We show that quantitative agreement is obtained with experimental data, assuming this reaction is dominated by quasifree single-nucleon knockout, and using an N* free width of 150 MeV. Differential and total cross sections are calculated for the exclusive reaction C-13(pi+, eta)N-13.