Phys. Rev. C
68,
014313
(2003)
[10 pages]
Observation of nuclear scaling in the A(e,e′) reaction at xB>1
K. Sh. Egiyan et al. (CLAS Collaboration)
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K. Sh. Egiyan1, N. Dashyan1, M. Sargsian11, S. Stepanyan36,27, L. B. Weinstein27, G. Adams31, P. Ambrozewicz11, E. Anciant6, M. Anghinolfi16, B. Asavapibhop23, G. Asryan1, G. Audit6, T. Auger6, H. Avakian36, H. Bagdasaryan27, J. P. Ball2, S. Barrow12, M. Battaglieri16, K. Beard20, I. Bedlinski19, M. Bektasoglu26,21, M. Bellis31, N. Benmouna13, N. Bianchi15, A. S. Biselli4, S. Boiarinov19, B. E. Bonner32, S. Bouchigny17, R. Bradford4, D. Branford10, W. J. Briscoe13, W. K. Brooks36, V. D. Burkert36, C. Butuceanu40, J. R. Calarco24, D. S. Carman4, B. Carnahan5, C. Cetina13, L. Ciciani27, P. L. Cole35, A. Coleman40, D. Cords36, J. Connelly13, P. Corvisiero16, D. Crabb39, H. Crannell5, J. P. Cummings31, E. DeSanctis15, R. DeVita16, P. V. Degtyarenko36, R. Demirchyan1, H. Denizli29, L. Dennis12, K. V. Dharmawardane27, K. S. Dhuga13, C. Djalali34, G. E. Dodge27, D. Doughty7,36, P. Dragovitsch12, M. Dugger2, S. Dytman29, O. P. Dzyubak34, M. Eckhause40, H. Egiyan36, L. Elouadrhiri36, A. Empl31, P. Eugenio12, R. Fatemi39, R. J. Feuerbach4, J. Ficenec38, T. A. Forest27, H. Funsten40, M. Gai8, G. Gavalian24, S. Gilad22, G. P. Gilfoyle33, K. L. Giovanetti20, P. Girard34, C. I. O. Gordon14, K. Griffioen40, M. Guidal17, M. Guillo34, L. Guo36, V. Gyurjyan36, C. Hadjidakis17, R. S. Hakobyan5, J. Hardie7,36, D. Heddle7,36, P. Heimberg13, F. W. Hersman24, K. Hicks26, R. S. Hicks23, M. Holtrop24, J. Hu31, C. E. Hyde-Wright27, Y. Ilieva13, M. M. Ito36, D. Jenkins38, K. Joo36, J. H. Kelley9, M. Khandaker25, D. H. Kim21, K. Y. Kim29, K. Kim21, M. S. Kim21, W. Kim21, A. Klein27, F. J. Klein36,5, A. Klimenko27, M. Klusman31, M. Kossov19, L. H. Kramer11,36, Y. Kuang40, S. E. Kuhn27, J. Kuhn4, J. Lachniet4, J. M. Laget6, D. Lawrence23, Ji Li31, K. Lukashin36,5, J. J. Manak36, C. Marchand6, L. C. Maximon13, S. McAleer12, J. McCarthy39, J. W. C. McNabb4, B. A. Mecking36, S. Mehrabyan29, J. J. Melone14, M. D. Mestayer36, C. A. Meyer4, K. Mikhailov19, R. Minehart39, M. Mirazita15, R. Miskimen23, L. Morand6, S. A. Morrow6, M. U. Mozer26, V. Muccifora15, J. Mueller29, L. Y. Murphy13, G. S. Mutchler32, J. Napolitano31, R. Nasseripour11, S. O. Nelson9, S. Niccolai13, G. Niculescu26, I. Niculescu20,13, B. B. Niczyporuk36, R. A. Niyazov27, M. Nozar36, G. V. O’Rielly13, A. K. Opper26, M. Osipenko16, K. Park21, E. Pasyuk2, G. Peterson23, S. A. Philips13, N. Pivnyuk19, D. Pocanic39, O. Pogorelko19, E. Polli15, S. Pozdniakov19, B. M. Preedom34, J. W. Price3, Y. Prok39, D. Protopopescu14, L. M. Qin27, B. A. Raue11,36, G. Riccardi12, G. Ricco16, M. Ripani16, B. G. Ritchie2, F. Ronchetti15,30, P. Rossi15, D. Rowntree22, P. D. Rubin33, F. Sabatié6,27, K. Sabourov9, C. Salgado25, J. P. Santoro38,36, V. Sapunenko16, R. A. Schumacher4, V. S. Serov19, Y. G. Sharabian1,36, J. Shaw23, S. Simionatto13, A. V. Skabelin22, E. S. Smith36, L. C. Smith39, D. I. Sober5, M. Spraker9, A. Stavinsky19, P. Stoler31, I. Strakovsky13, S. Strauch13, M. Strikman28, M. Taiuti16, S. Taylor32, D. J. Tedeschi34, U. Thoma36,18, R. Thompson29, L. Todor4, C. Tur34, M. Ungaro31, M. F. Vineyard37, A. V. Vlassov19, K. Wang39, A. Weisberg26, H. Weller9, D. P. Weygand36, C. S. Whisnant34,20, E. Wolin36, M. H. Wood34, A. Yegneswaran36, J. Yun27, B. Zhang22, J. Zhao22, and Z. Zhou22,7 (CLAS Collaboration)
1Yerevan Physics Institute, Yerevan 375036, Armenia
2Arizona State University, Tempe, Arizona 85287-1504, USA
3University of California at Los Angeles, Los Angeles, California 90095-1547, USA
4Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
5Catholic University of America, Washington, D.C. 20064, USA
6CEA-Saclay, Service de Physique Nucléaire, F91191 Gif-sur-Yvette, Cedex, France
7Christopher Newport University, Newport News, Virginia 23606, USA
8University of Connecticut, Storrs, Connecticut 06269, USA
9Duke University, Durham, North Carolina 27708-0305, USA
10Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
11Florida International University, Miami, Florida 33199, USA
12Florida State University, Tallahassee, Florida 32306, USA
13The George Washington University, Washington, D.C. 20052, USA
14University of Glasgow, Glasgow G12 8QQ, United Kingdom
15INFN, Laboratori Nazionali di Frascati, Frascati, Italy
16INFN, Sezione di Genova, I-16146 Genova, Italy
17Institut de Physique Nucleaire ORSAY, Orsay, France
18Institute für Strahlen und Kernphysik, Universität Bonn, Bonn, Germany
19Institute of Theoretical and Experimental Physics, Moscow 117259, Russia
20James Madison University, Harrisonburg, Virginia 22807, USA
21Kungpook National University, Taegu 702-701, South Korea
22Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
23University of Massachusetts, Amherst, Massachusetts 01003, USA
24University of New Hampshire, Durham, New Hampshire 03824-3568, USA
25Norfolk State University, Norfolk, Virginia 23504, USA
26Ohio University, Athens, Ohio 45701, USA
27Old Dominion University, Norfolk, Virginia 23529, USA
28Pennsylvania State University, State College, Pennsylvania 16802, USA
29University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
30Universita’ di ROMA III, I-00146 Roma, Italy
31Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
32Rice University, Houston, Texas 77005-1892, USA
33University of Richmond, Richmond, Virginia 23173, USA
34University of South Carolina, Columbia, South Carolina 29208, USA
35University of Texas at El Paso, El Paso, Texas 79968, USA
36Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
37Union College, Schenectady, New York 12308, USA
38Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
39University of Virginia, Charlottesville, Virginia 22901, USA
40College of William and Mary, Williamsburg, Virginia 23187-8795, USA
Received 18 January 2003; published 29 July 2003
The ratios of inclusive electron scattering cross sections of 4He, 12C, and 56Fe to 3He have been measured for the first time. It is shown that these ratios are independent of xB at Q2>1.4GeV2 for xB>1.5, where the inclusive cross section depends primarily on the high momentum components of the nuclear wave function. The observed scaling shows that the momentum distributions at high-momenta have the same shape for all nuclei and differ only by a scale factor. The observed onset of the scaling at Q2>1.4GeV2 and xB>1.5 is consistent with the kinematical expectation that two-nucleon short range correlations (SRC) dominate the nuclear wave function at pm≳300MeV/c. The values of these ratios in the scaling region can be related to the relative probabilities of SRC in nuclei with A>~3. Our data, combined with calculations and other measurements of the 3He/deuterium ratio, demonstrate that for nuclei with A>~12 these probabilities are 4.9–5.9 times larger than in deuterium, while for 4He it is larger by a factor of about 3.8.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.68.014313
DOI:
10.1103/PhysRevC.68.014313
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