Short--Range and Tensor Correlations in the 16O(e,e',pn)14N Reaction

The cross sections for electron-induced two-nucleon knockout reactions are evaluated for the example of the 16O(e,e'pn)14N reaction leading to discrete states in the residual nucleus 14N. These calculations account for the effects of nucleon-nucleon correlations and include the contributions of two-body meson exchange currents as the pion seagull, pion in flight, and the isobar current contribution. The effects of short-range as well as tensor correlations are calculated within the framework of the coupled cluster method employing the Argonne V14 potential as a model for a realistic nucleon-nucleon interaction. The relative importance of correlation effects as compared to the contribution of the meson exchange currents depends on the final state of the residual nucleus. The cross section leading to specific states, such as, e.g., the ground state of 14N, is rather sensitive to the details of the correlated wave function.