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Dynamics of the quasielastic ^(16)O(e,e'p) reaction at Q^2≈0.8 (GeV/c)^2

Fissum, K. G. and Gao, J. (2004) Dynamics of the quasielastic ^(16)O(e,e'p) reaction at Q^2≈0.8 (GeV/c)^2. Physical Review C, 70 (3). Art. No. 034606. ISSN 0556-2813. doi:10.1103/PhysRevC.70.034606.

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The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the ^(16)O(e,e′p) reaction in quasielastic, constant (q,ω) kinematics at Q^2≈0.8(GeV/c)^2, q≈1GeV/c, and ω≈445MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Five-fold differential cross-section data for the removal of protons from the 1p-shell have been obtained for 0<p_miss<350MeV/c. Six-fold differential cross-section data for 0<E_miss<120MeV were obtained for 0<p_miss<340MeV/c. These results have been used to extract the ALT asymmetry and the R_L, R_T, R_LT, and R_(L+TT) effective response functions over a large range of E_miss and p_miss. Detailed comparisons of the 1p-shell data with Relativistic Distorted-Wave Impulse Approximation (RDWIA), Relativistic Optical-Model Eikonal Approximation (ROMEA), and Relativistic Multiple-Scattering Glauber Approximation (RMSGA) calculations indicate that two-body currents stemming from meson-exchange currents (MEC) and isobar currents (IC) are not needed to explain the data at this Q^2. Further, dynamical relativistic effects are strongly indicated by the observed structure in ALT at p_miss≈300MeV/c. For 25<E_miss<50MeV and p_miss≈50MeV/c, proton knockout from the 1s1/2-state dominates, and ROMEA calculations do an excellent job of explaining the data. However, as p_miss increases, the single-particle behavior of the reaction is increasingly hidden by more complicated processes, and for 280<p_miss<340MeV/c, ROMEA calculations together with two-body currents stemming from MEC and IC account for the shape and transverse nature of the data, but only about half the magnitude of the measured cross section. For 50<E_miss<120MeV and 145<p_miss<340MeV/c, (e,e′pN) calculations which include the contributions of central and tensor correlations (two-nucleon correlations) together with MEC and IC (two-nucleon currents) account for only about half of the measured cross section. The kinematic consistency of the 1p-shell normalization factors extracted from these data with respect to all available O16(e,e′p) data is also examined in detail. Finally, the Q^2-dependence of the normalization factors is discussed.

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Additional Information:© 2004 American Physical Society. Received 20 January 2004; published 20 September 2004. We acknowledge the outstanding support of the staff of the Accelerator and Physics Divisions at Jefferson Lab that made this experiment successful. We thank T. W. Donnelly and J. W. Van Orden for valuable discussions. This work was supported in part by the U. S. Department of Energy Contract No. DE-AC05-84ER40150 under which the Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility, other Department of Energy contracts, the National Science Foundation, the Swedish Research Council (VR), the Italian Istituto Nazionale di Fisica Nucleare (INFN), the French Centre National de la Recherche Scientifique (CNRS) and Commissariat á l’Energie Atomique, and the Natural Sciences and Engineering Research Council of Canada.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC05-84ER40150
Department of Energy (DOE)UNSPECIFIED
Swedish Research CouncilUNSPECIFIED
Italian Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
French Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Issue or Number:3
Classification Code:PACS: 25.30.Fj, 24.70.1s, 27.20.1n
Record Number:CaltechAUTHORS:20140304-110941461
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44123
Deposited On:05 Mar 2014 19:33
Last Modified:10 Nov 2021 16:47

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