Phys. Rev. C
73,
035212
(2006)
[14 pages]
Electron scattering from high-momentum neutrons in deuterium
A. V. Klimenko et al. CLAS Collaboration
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A. V. Klimenko27,*, S. E. Kuhn27,†, C. Butuceanu38, K. S. Egiyan39, K. A. Griffioen38, G. Adams29, P. Ambrozewicz9, M. Anghinolfi15, G. Asryan39, H. Avakian34, H. Bagdasaryan27,39, N. Baillie38, J. P. Ball1, N. A. Baltzell33, S. Barrow10, V. Batourine20, M. Battaglieri15, I. Bedlinskiy18, M. Bektasoglu31, M. Bellis3,29, N. Benmouna11, A. S. Biselli3,29, S. Bouchigny16, S. Boiarinov34, R. Bradford3, D. Branford8, W. K. Brooks34, S. Bültmann27, V. D. Burkert34, J. R. Calarco24, S. L. Careccia27, D. S. Carman26, A. Cazes33, S. Chen10, P. L. Cole13,34, P. Coltharp10, D. Cords34,‡, P. Corvisiero15, D. Crabb37, J. P. Cummings29, N. B. Dashyan39, R. DeVita15, E. De Sanctis14, P. V. Degtyarenko34, H. Denizli28, L. Dennis10, K. V. Dharmawardane27, C. Djalali33, G. E. Dodge27, J. Donnelly12, D. Doughty6,34, M. Dugger1, S. Dytman28, O. P. Dzyubak33, H. Egiyan34,38,§, L. Elouadrhiri34, P. Eugenio10, R. Fatemi37, G. Fedotov23, R. G. Fersch38, R. J. Feuerbach34, H. Funsten38, M. Garçon5, G. Gavalian24,27, G. P. Gilfoyle32, K. L. Giovanetti19, F. X. Girod5, J. T. Goetz2, A. Gonenc9, C. I. O. Gordon12, R. W. Gothe33, M. Guidal16, M. Guillo33, N. Guler27, L. Guo34, V. Gyurjyan34, C. Hadjidakis16, R. S. Hakobyan4, J. Hardie6,34, F. W. Hersman24, K. Hicks26, I. Hleiqawi26, M. Holtrop24, C. E. Hyde-Wright27, Y. Ilieva11, D. G. Ireland12, B. S. Ishkhanov23, M. M. Ito34, D. Jenkins36, H. S. Jo16, K. Joo7,34, H. G. Juengst11,**, J. D. Kellie12, M. Khandaker25, W. Kim20, A. Klein27, F. J. Klein4, M. Kossov18, L. H. Kramer9,34, V. Kubarovsky29, J. Kuhn3,29, S. V. Kuleshov18, J. Lachniet3, J. M. Laget5,34, J. Langheinrich33, D. Lawrence22, Ji Li29, K. Livingston12, S. McAleer10, B. McKinnon12, J. W. C. McNabb3, B. A. Mecking34, S. Mehrabyan28, J. J. Melone12, M. D. Mestayer34, C. A. Meyer3, T. Mibe26, K. Mikhailov18, R. Minehart37, M. Mirazita14, R. Miskimen22, V. Mokeev23, L. Morand5, S. A. Morrow5,16, J. Mueller28, G. S. Mutchler30, P. Nadel-Turonski11, J. Napolitano29, R. Nasseripour9,33, S. Niccolai11,16, G. Niculescu19,26, I. Niculescu19,34, B. B. Niczyporuk34, R. A. Niyazov27,34, M. Nozar34, G. V. O'Rielly11, M. Osipenko15,23, A. I. Ostrovidov10, K. Park20, E. Pasyuk1, C. Paterson12, J. Pierce37, N. Pivnyuk18, D. Pocanic37, O. Pogorelko18, S. Pozdniakov18, B. M. Preedom33, J. W. Price2, Y. Prok37,††, D. Protopopescu12,24, B. A. Raue9,34, G. Riccardi10, G. Ricco15, M. Ripani15, B. G. Ritchie1, F. Ronchetti14, G. Rosner12, P. Rossi14, F. Sabatié5, C. Salgado25, J. P. Santoro4, V. Sapunenko34, R. A. Schumacher3, V. S. Serov18, Y. G. Sharabian34, A. V. Skabelin21, E. S. Smith34, L. C. Smith37, D. I. Sober4, A. Stavinsky18, S. S. Stepanyan20, S. Stepanyan34, B. E. Stokes10, P. Stoler29, S. Strauch11, M. Taiuti15, D. J. Tedeschi33, U. Thoma17,34,‡‡, A. Tkabladze26, S. Tkachenko27, L. Todor3, C. Tur33, M. Ungaro7,29, M. F. Vineyard32,35, A. V. Vlassov18, L. B. Weinstein27, D. P. Weygand34, M. Williams3, E. Wolin34, M. H. Wood33,a, A. Yegneswaran34, L. Zana24, J. Zhang27, and B. Zhao7 (CLAS Collaboration)
1Arizona State University, Tempe, Arizona 85287-1504, USA
2University of California at Los Angeles, Los Angeles, California 90095-1547, USA
3Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
4Catholic University of America, Washington, DC 20064, USA
5CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, Cedex, France
6Christopher Newport University, Newport News, Virginia 23606, USA
7University of Connecticut, Storrs, Connecticut 06269, USA
8Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
9Florida International University, Miami, Florida 33199, USA
10Florida State University, Tallahassee, Florida 32306, USA
11George Washington University, Washington, DC 20052, USA
12University of Glasgow, Glasgow G12 8QQ, United Kingdom
13Idaho State University, Pocatello, Idaho 83209, USA
14INFN, Laboratori Nazionali di Frascati, Frascati, Italy
15INFN, Sezione di Genova, I-16146 Genova, Italy
16Institut de Physique Nucleaire Orsay, Orsay, France
17Institute für Strahlen und Kernphysik, Universität Bonn, Germany
18Institute of Theoretical and Experimental Physics, RU-117259 Moscow, Russia
19James Madison University, Harrisonburg, Virginia 22807, USA
20Kyungpook National University, Daegu 702-701, South Korea
21Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
22University of Massachusetts, Amherst, Massachusetts 01003, USA
23Moscow State University, General Nuclear Physics Institute, RU-119899 Moscow, Russia
24University of New Hampshire, Durham, New Hampshire 03824, USA
25Norfolk State University, Norfolk, Virginia 23504, USA
26Ohio University, Athens, Ohio 45701, USA
27Old Dominion University, Norfolk, Virginia 23529, USA
28University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
29Rensselaer Polytechnic Institute, Troy, New York 12180, USA
30Rice University, Houston, Texas 77005, USA
31Sakarya University, Sakarya, Turkey
32University of Richmond, Richmond, Virginia 23173, USA
33University of South Carolina, Columbia, South Carolina 29208, USA
34Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
35Union College, Schenectady, New York 12308, USA
36Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
37University of Virginia, Charlottesville, Virginia 22901, USA
38College of William and Mary, Williamsburg, Virginia 23187, USA
39Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 14 October 2005; published 24 March 2006
We report results from an experiment measuring the semiinclusive reaction 2H(e,e'ps) in which the proton ps is moving at a large angle relative to the momentum transfer. If we assume that the proton was a spectator to the reaction taking place on the neutron in deuterium, the initial state of that neutron can be inferred. This method, known as spectator tagging, can be used to study electron scattering from high-momentum (off-shell) neutrons in deuterium. The data were taken with a 5.765 GeV electron beam on a deuterium target in Jefferson Laboratory's Hall B, using the CEBAF large acceptance spectrometer. A reduced cross section was extracted for different values of final state missing mass W*, backward proton momentum p⃗s, and momentum transfer Q2. The data are compared to a simple plane wave impulse approximation (PWIA) spectator model. A strong enhancement in the data observed at transverse kinematics is not reproduced by the PWIA model. This enhancement can likely be associated with the contribution of final state interactions (FSI) that were not incorporated into the model. Within the framework of the simple spectator model, a “bound neutron structure function” F2neff was extracted as a function of W* and the scaling variable x* at extreme backward kinematics, where the effects of FSI appear to be smaller. For ps>0.4 GeV/c, where the neutron is far off-shell, the model overestimates the value of F2neff in the region of x* between 0.25 and 0.6. A dependence of the bound neutron structure function on the neutron's “off-shell-ness” is one possible effect that can cause the observed deviation.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.035212
DOI:
10.1103/PhysRevC.73.035212
PACS:
24.85.+p, 25.30.-c, 21.45.+v
*Electronic address: klimenko@lanl.gov; current address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545. †Electronic address: skuhn@odu.edu ‡Deceased. §Current address: University of New Hampshire, Durham, New Hampshire 03824. **Current address: Old Dominion University, Norfolk, Virginia 23529. ††Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139. ‡‡Current address: Physikalisches Institut der Universitaet Giessen, D-35392 Giessen, Germany. aCurrent address: University of Massachusetts, Amherst, Massachusetts 01003.
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