Quasielastic <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi></mi></mrow><mrow><mn>12</mn></mrow></msup></mrow><mi mathvariant="normal">C</mi><mrow><msup><mrow><mo>(</mo><mi>e</mi><mo>,</mo><mi>e</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow><mi>p</mi><mo>)</mo></math></span> reaction at high momentum transfer

J. H. Morrison; H. Baghaei; W. Bertozzi; S. Gilad; J. Glickman; C. E. Hyde-Wright; N. Kalantar-Nayestanaki; R. W. Lourie; S. Penn; P. E. Ulmer; L. B. Weinstein; B. H. Cottman; L. Ghedira; E. J. Winhold; J. R. Calarco; J. Wise; P. Boberg; C. C. Chang; D. Zhang; K. Aniol; M. B. Epstein; D. J. Margaziotis; J. M. Finn; C. Perdrisat; V. Punjabi

doi:10.1103/PhysRevC.59.221

Quasielastic $^{12} C {(e, e}^{'} p)$ reaction at high momentum transfer

J. H. Morrison, H. Baghaei, W. Bertozzi, S. Gilad, J. Glickman, C. E. Hyde-Wright, N. Kalantar-Nayestanaki, R. W. Lourie, S. Penn, P. E. Ulmer, L. B. Weinstein, B. H. Cottman, L. Ghedira, E. J. Winhold, J. R. Calarco, J. Wise, P. Boberg, C. C. Chang, D. Zhang, K. Aniol, M. B. Epstein, D. J. Margaziotis, J. M. Finn, C. Perdrisat, and V. Punjabi

Phys. Rev. C 59, 221 – Published 1 January 1999

Abstract

We measured the $^{12} C {(e, e}^{'} p)$ cross section as a function of missing energy in parallel kinematics for $(q, ω) = (970 MeV / c, 330 MeV)$ and $(990 MeV / c, 475 MeV) .$ At $ω = 475 MeV,$ at the maximum of the quasielastic peak, there is a large continuum ${(E}_{m} > 50 MeV)$ cross section extending out to the deepest missing energy measured, amounting to almost 50% of the measured cross section. The ratio of data to distorted-wave impulse approximation (DWIA) calculation is 0.4 for both p and s shells. At $ω = 330 MeV,$ well below the maximum of the quasielastic peak, the continuum cross section is much smaller and the ratio of data to DWIA calculation is 0.85 for the p shell and 1.0 for the s shell. We infer that one or more mechanisms that increase with $ω$ transform some of the single-nucleon knockouts into a multinucleon knockout, decreasing the valence knockout cross section and increasing the continuum cross section.

Received 11 February 1998

DOI:https://doi.org/10.1103/PhysRevC.59.221

Authors & Affiliations

J. H. Morrison^*, H. Baghaei^†, W. Bertozzi, S. Gilad, J. Glickman^‡, C. E. Hyde-Wright^§, N. Kalantar-Nayestanaki^∥, R. W. Lourie^¶, S. Penn^**, P. E. Ulmer^§, and L. B. Weinstein^§

Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

B. H. Cottman^††, L. Ghedira, and E. J. Winhold

Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12181

J. R. Calarco and J. Wise^‡‡

Department of Physics, University of New Hampshire, Durham, New Hampshire 03824

P. Boberg^§§, C. C. Chang, and D. Zhang

Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742

K. Aniol, M. B. Epstein, and D. J. Margaziotis

Department of Physics and Astronomy, California State University, Los Angeles, California 90032

J. M. Finn, C. Perdrisat, and V. Punjabi^∥∥

Department of Physics, College of William and Mary, Williamsburg, Virginia 23185

^*Present address: University of Houston Law Center, Houston, TX 77204.
^†Present address: Department of Nuclear Medicine, UT MD Anderson Cancer Center, 1100 Holcombe Boulevard, Houston, TX 77030.
^‡Present address: 9308 Cheney Hill Road, College Park, MD 20740.
^§Present address: Department of Physics, Old Dominion University, Norfolk, VA 23529.
^∥Present address: KVI, 9747 AA Groningen, The Netherlands.
^¶Present address: SUNY at Stony Brook, Stony Brook, NY 11794-3800.
^**Present address: Department of Physics, Syracuse University, Syracuse, NY 13244.
^††Present address: I-Kinetics, Inc., 19 Bishop Allen Drive, Cambridge, MA 02139.
^‡‡Present address: 74 Boston Road, Apt. B-106, Chelmsford, MA 01824.
^§§Present address: USRA, Code 7654, Naval Research Laboratory, Washington, DC 20375-5352.
^∥∥Present address: Department of Physics, Norfolk State University, Norfolk, VA 23504.

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