2-Nucleon Knock-Out Investigated With The Semi-Exclusive C-12(E,E'P)-Reaction
PHYSICS LETTERS B(1995)
Abstract
The C-12(e, e' p) reaction has been studied in the dip region, at an energy transfer o = 212 MeV and a three-momentum transfer /q/ = 270 MeV/c. The data cover a missing energy range 0-180 MeV and include missing momenta up to 750 MeV/c. The cross sections, measured at various angles between the detected proton and q, show a clear signature for two-nucleon knock-out. At large angles, the measured strength can mainly be attributed to the coupling of the virtual photon to pion exchange currents and intermediate Delta-excitation. The data at small angles cannot be explained by these mechanisms alone. It is suggested that additional strength originates from the emission of a correlated nucleon pair.
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