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Direct Observation Of Proton-Neutron Short-Range Correlation Dominance In Heavy Nuclei, M. Duer, A. Schmidt, J. R. Pybus, E. P. Segarra, A. Hrnjic, L. B. Weinstein, M. Hattawy, F. Hauenstein, S.E. Kuhn, Clas Collaboration
Direct Observation Of Proton-Neutron Short-Range Correlation Dominance In Heavy Nuclei, M. Duer, A. Schmidt, J. R. Pybus, E. P. Segarra, A. Hrnjic, L. B. Weinstein, M. Hattawy, F. Hauenstein, S.E. Kuhn, Clas Collaboration
Physics Faculty Publications
We measured the triple coincidence A(e,e′n p) and A(e,e′ p p) reactions on carbon, aluminum, iron, and lead targets at Q2 >1.5 (GeV/c)2, xB > 1.1 and missing momentum >400 MeV/c. This was the first direct measurement of both proton-proton (pp) and neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all measured nuclei, the average proton-proton (pp) to neutron-proton (np) reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for single-charge exchange effects decreased the SRC pairs ratio to ∼3%, which is lower than previous results. Comparisons to theoretical …