THE C-12(E, E'P) AND C-12(E, E'PP) REACTIONS IN THE DELTA-RESONANCE REGION

Coincidence cross sections for the C-12(e, e'pp) and C-12(e, e'p) reac tions have been measured in the Delta-resonance region. The C-12(e, e' pp) reaction has been measured at three different angular settings of the proton detectors to investigate the angular correlation between th e emitted protons. The data, which have a low statistical accuracy, ar e compared with a calculation based on the direct-knockout mechanism, which includes one- and two-body currents. NN-correlations are account ed for via a correlation function, Delta-excitation via a two-body cur rent and final-state interactions of the emitted protons via an optica l potential. The C-12(e, e'p) data, taken at large proton-emission ang les, cover the region of high missing-energy values (145-275 MeV). The data are compared to results of a calculation taking into account mes on exchange, intermediate Delta-excitation and pion production. This c omparison shows that there is ample evidence for processes leading to multi-nucleon knockout.