Two-nucleon knockout contributions to the ${}^{12}$C$(e,e^{\prime }p)$ reaction in the dip and {$\Delta$}(1232) regions

Abstract

The contributions from ${}^{12}$C$(e,e^{\prime }pn)$ and ${}^{12}$C$(e,e^{\prime }pp)$ to the semi-exclusive ${}^{12}$C$(e,e^{\prime }p)$ cross section have been calculated in an unfactorized model for two-nucleon emission. We assume direct two-nucleon knockout after virtual photon coupling with the two-body pion-exchange currents in the target nucleus. Results are presented at several kinematical conditions in the dip and $\Delta$(1232) regions. The calculated two-nucleon knockout strength is observed to account for a large fraction of the measured $(e,e^{\prime }p)$ strength above the two-nucleon emission threshold.

12 Revtex pages, 4 postscript figures (available upon request), University of Gent preprint SSF94-02-01