np Short-Range Correlations from (p,2p+n) Measurements

A. Tang, J. W. Watson, J. Aclander, J. Alster, G. Asryan, Y. Averichev, D. Barton, V. Baturin, N. Bukhtoyarova, A. Carroll, S. Gushue, S. Heppelmann, A. Leksanov, Y. Makdisi, A. Malki, E. Minina, I. Navon, H. Nicholson, A. Ogawa, Yu. Panebratsev, E. Piasetzky, A. Schetkovsky, S. Shimanskiy, and D. Zhalov
Phys. Rev. Lett. 90, 042301 – Published 28 January 2003

Abstract

We studied the C12(p,2p+n) reaction at beam momenta of 5.9, 8.0, and 9.0GeV/c. For quasielastic (p,2p) events pf, the momentum of the knocked-out proton before the reaction, was compared (event by event) with pn, the coincident neutron momentum. For |pn|>kF=0.220GeV/c (the Fermi momentum) a strong back-to-back directional correlation between pf and pn was observed, indicative of short-range np correlations. From pn and pf 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 |pf|>kF had directionally correlated neutrons with |pn|>kF.

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  • Received 9 May 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.042301

©2003 American Physical Society

Authors & Affiliations

A. Tang1, J. W. Watson1, J. Aclander2, J. Alster2, G. Asryan4,3, Y. Averichev8, D. Barton4, V. Baturin6,5, N. Bukhtoyarova4,5, A. Carroll4, S. Gushue4, S. Heppelmann6, A. Leksanov6, Y. Makdisi4, A. Malki2, E. Minina6, I. Navon2, H. Nicholson7, A. Ogawa6, Yu. Panebratsev8, E. Piasetzky2, A. Schetkovsky6,5, S. Shimanskiy8, and D. Zhalov6

  • 1Department of Physics, Kent State University, Kent, Ohio 44242
  • 2School of Physics and Astronomy, Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv 69978, Israel
  • 3Yerevan Physics Institute, Yerevan 375036, Armenia
  • 4Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973
  • 5Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188350, Russia
  • 6Physics Department, Pennsylvania State University, University Park, Pennsylvania 16801
  • 7Department of Physics, Mount Holyoke College, South Hadley, Massachusetts 01075
  • 8J.I.N.R., Dubna, Moscow 141980, Russia

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Vol. 90, Iss. 4 — 31 January 2003

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