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Tang, A; Watson, J W; Aclander, J; Alster, J; Asryan, G; Averichev, Y; Barton, D; Baturin, V; Bukhtoyarova, N; Carroll, A; Gushue, S; Heppelmann, S; Leksanov, A; Makdisi, Y; Malki, A; Minina, E; Navon, I; Nicholson, H; Ogawa, A; Panebratsev, Yu; Piasetzky, E; Schetkovsky, A; Shimanskiy, S; Zhalov, D
Physical review letters, 01/2003, Volume: 90, Issue: 4Journal Article
We studied the 12C(p,2p+n) reaction at beam momenta of 5.9, 8.0, and 9.0 GeV/c. For quasielastic (p,2p) events p(f), the momentum of the knocked-out proton before the reaction, was compared (event by event) with p(n), the coincident neutron momentum. For |p(n)|>k(F)=0.220 GeV/c (the Fermi momentum) a strong back-to-back directional correlation between p(f) and p(n) was observed, indicative of short-range n-p correlations. From p(n) and p(f) we constructed the distributions of c.m. and relative motion in the longitudinal direction for correlated pairs. We also determined that 49+/-13% of events with |p(f)|>k(F) had directionally correlated neutrons with |p(n)|>k(F).
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