MULTINUCLEON CONTRIBUTIONS TO THE C-12(PI(+),PP) REACTION AT 100 AND 165 MEV INCIDENT PION ENERGIES

Differential and total cross sections for pi(+) absorption on C-12 are presented at incident pion energies of 100 and 165 MeV, This is the f irst time that this reaction has been measured with a combination of g ood energy and angle information over an extensive region of phase spa ce. Results are compared to extensive Monte Carlo simulations in order to investigate the role of two-and multinucleon absorption processes in this nucleus. Signatures of ISI and FSI in the pion absorption proc ess are also investigated, in order to explain the complex reaction me chanism implied by the data. (C) 1997 Elsevier Science B.V.