INCLUSIVE AND EXCLUSIVE PRODUCTION OF ETA-MESONS NEAR-THRESHOLD

Inclusive and exclusive (pi,eta) reactions are studied in a momentum s pace DWIA model. We assume both reactions are dominated by formation o f an N(1535) resonance, taking into account medium corrections to the N self energy. Cross sections are calculated for (pi+, eta) inclusive reactions on C-12 and compared with both experiment and previous theo retical calculations. Assuming an N free width of 150 MeV, we obtain quantitative agreement with experiment, assuming this reaction is domi nated by quasifree single-nucleon knockout. Differential and total cro ss sections are calculated for the exclusive reaction C-13(pi+, eta)N- 13.