Phys. Rev. C
73,
025205
(2006)
[36 pages]
Measurements of the neutron electric to magnetic form factor ratio GEn/GMn via the 2H(e⃗,e'n⃗)1H reaction to Q2=1.45 (GeV/c)2
B. Plaster et al. Jefferson Laboratory E93-038 Collaboration
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B. Plaster1,2,*, A. Yu. Semenov3,4,†, A. Aghalaryan5, E. Crouse6, G. MacLachlan7, S. Tajima8, W. Tireman3,9, A. Ahmidouch10, B. D. Anderson3, H. Arenhövel11, R. Asaturyan5, O. K. Baker12, A. R. Baldwin3, D. Barkhuff1,‡, H. Breuer13, R. Carlini14, E. Christy12, S. Churchwell8,§, L. Cole12, S. Danagoulian10,14, D. Day15, T. Eden3,12,**, M. Elaasar16, R. Ent14, M. Farkhondeh1, H. Fenker14, J. M. Finn6, L. Gan12, A. Gasparian10,12, K. Garrow14, P. Gueye12, C. R. Howell8, B. Hu12, M. K. Jones14, J. J. Kelly13, C. Keppel12, M. Khandaker17, W.-Y. Kim18, S. Kowalski1, A. Lung14, D. Mack14, R. Madey3,6,14, D. M. Manley3, P. Markowitz19, J. Mitchell14, H. Mkrtchyan5, A. K. Opper7, C. Perdrisat6, V. Punjabi17, B. Raue19, T. Reichelt20, J. Reinhold19, J. Roche6, Y. Sato12, N. Savvinov13, I. A. Semenova3,4, W. Seo18, N. Simicevic21, G. Smith14, S. Stepanyan5, V. Tadevosyan5, L. Tang12, S. Taylor1, P. E. Ulmer22, W. Vulcan14, J. W. Watson3, S. Wells21, F. Wesselmann15, S. Wood14, Chen Yan14, Chenyu Yan3, S. Yang18, L. Yuan12, W.-M. Zhang3, H. Zhu15, and X. Zhu12 (Jefferson Laboratory E93-038 Collaboration)
1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2California Institute of Technology, Pasadena, California 91125, USA
3Kent State University, Kent, Ohio 44242, USA
4Joint Institute for Nuclear Research, Dubna RU-141980, Russia
5Yerevan Physics Institute, Yerevan 375036, Armenia
6The College of William and Mary, Williamsburg, Virginia 23187, USA
7Ohio University, Athens, Ohio 45701, USA
8Duke University and TUNL, Durham, North Carolina 27708, USA
9Northern Michigan University, Marquette, Michigan 49855, USA
10North Carolina A&T State University, Greensboro, North Carolina 27411, USA
11Johannes Gutenberg-Universität, D-55099 Mainz, Germany
12Hampton University, Hampton, Virginia 23668, USA
13University of Maryland, College Park, Maryland 20742, USA
14Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
15University of Virginia, Charlottesville, Virginia 22904, USA
16Southern University at New Orleans, New Orleans, Louisiana 70126, USA
17Norfolk State University, Norfolk, Virginia 23504, USA
18Kyungpook National University, Taegu 702-701, Korea
19Florida International University, Miami, Florida 33199, USA
20Rheinische Friedrich-Wilhelms-Universität, D-53115 Bonn, Germany
21Louisiana Tech University, Ruston, Louisiana 71272, USA
22Old Dominion University, Norfolk, Virginia 23508, USA
Received 13 November 2005; published 27 February 2006
We report values for the neutron electric to magnetic form factor ratio, GEn/GMn, deduced from measurements of the neutron's recoil polarization in the quasielastic 2H(e⃗,e'n⃗)1H reaction, at three Q2 values of 0.45, 1.13, and 1.45 (GeV/c)2. The data at Q2=1.13 and 1.45 (GeV/c)2 are the first direct experimental measurements of GEn employing polarization degrees of freedom in the Q2>1 (GeV/c)2 region and stand as the most precise determinations of GEn for all values of Q2.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.025205
DOI:
10.1103/PhysRevC.73.025205
PACS:
14.20.Dh, 13.40.Gp, 25.30.Bf, 24.70.+s
*Electronic address: plaster@caltech.edu †Electronic address: semenov@jlab.org ‡Now at Renaissance Technologies, East Setauket, New York 11733, USA. §Now at University of Canterbury, Christchurch 8020, New Zealand. **Now at National Center for Atmospheric Research, Boulder, Colorado 80307, USA.
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