Author/Authors :
L.J.H.M. Kester، نويسنده , , W.H.A. Hesselink، نويسنده , , N. Kalantar-Nayestanaki، نويسنده , , J.H. Mitchell، نويسنده , , A. Pellegrino، نويسنده , , E. Jans، نويسنده , , J. Konijn، نويسنده , , J.J.M. Steijger، نويسنده , , J.L. Visschers، نويسنده , , Hans A. Zondervan، نويسنده , , J.R. Calarco، نويسنده , , D. DeAngelis، نويسنده , , F.W. Hersman، نويسنده , , W. Kim، نويسنده , , Th.S. Bauer، نويسنده , , M.W. Kelder، نويسنده , , Z. Papandreou، نويسنده , , J. Ryckebusch، نويسنده , , C. Ciofi degli Atti، نويسنده , , S. Simula، نويسنده , , et al.، نويسنده ,
Abstract :
The 12C(e, e′p) reaction has been studied in the dip region, at an energy transfer ω = 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 Δ-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.
