Ljhm. Kester et al., 2-NUCLEON KNOCK-OUT INVESTIGATED WITH THE SEMI-EXCLUSIVE C-12(E,E'P)-REACTION, Physics letters. Section B, 344(1-4), 1995, pp. 79-84
The C-12(e, e' p) reaction has been studied in the dip region, at an e
nergy 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 missin
g momenta up to 750 MeV/c. The cross sections, measured at various ang
les between the detected proton and q, show a clear signature for two-
nucleon knock-out. At large angles, the measured strength can mainly b
e attributed to the coupling of the virtual photon to pion exchange cu
rrents and intermediate Delta-excitation. The data at small angles can
not be explained by these mechanisms alone. It is suggested that addit
ional strength originates from the emission of a correlated nucleon pa
ir.