Phys. Rev. Lett.
92,
022301
(2004)
[5 pages]
Q2 Evolution of the Neutron Spin Structure Moments using a 3He Target
M. Amarian et al. Jefferson Lab E94010 Collaboration
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M. Amarian24, L. Auerbach20, T. Averett6,23, J. Berthot4, P. Bertin4, B. Bertozzi11, T. Black11, E. Brash16, D. Brown10, E. Burtin18, J. Calarco13, G. Cates15,22, Z. Chai11, J.-P. Chen6, Seonho Choi20, E. Chudakov6, E. Cisbani5, C. W. de Jager6, A. Deur4,6,22, R. DiSalvo4, S. Dieterich17, P. Djawotho23, M. Finn23, K. Fissum11, H. Fonvieille4, S. Frullani5, H. Gao11, J. Gao1, F. Garibaldi5, A. Gasparian3, S. Gilad11, R. Gilman6,17, A. Glamazdin9, C. Glashausser17, E. Goldberg1, J. Gomez6, V. Gorbenko9, J.-O. Hansen6, B. Hersman13, R. Holmes19, G. M. Huber16, E. Hughes1, B. Humensky15, S. Incerti20, M. Iodice5, S. Jensen1, X. Jiang17, C. Jones1, G. Jones8, M. Jones23, C. Jutier4,14, A. Ketikyan24, I. Kominis15, W. Korsch8, K. Kramer23, K. Kumar12,15, G. Kumbartzki17, M. Kuss6, E. Lakuriqi20, G. Laveissiere4, J. Lerose6, M. Liang6, N. Liyanage6,11, G. Lolos16, S. Malov17, J. Marroncle18, K. McCormick14, R. Mckeown1, Z.-E. Meziani20, R. Michaels6, J. Mitchell6, Z. Papandreou16, T. Pavlin1, G. G. Petratos7, D. Pripstein1, D. Prout7, R. Ransome17, Y. Roblin4, D. Rowntree11, M. Rvachev11, F. Sabatie14, A. Saha6, K. Slifer20, P. Souder19, T. Saito21, S. Strauch17, R. Suleiman7, K. Takahashi21, S. Teijiro21, L. Todor14, H. Tsubota21, H. Ueno21, G. Urciuoli5, R. Van der Meer6,16, P. Vernin18, H. Voskanian24, B. Wojtsekhowski6, F. Xiong11, W. Xu11, J.-C. Yang2, B. Zhang11, and P. Zolnierczuk8 (Jefferson Lab E94010 Collaboration)
1California Institute of Technology, Pasadena, California 91125, USA
2Chungnam National University, Taejon 305-764, Korea
3Hampton University, Hampton, Virginia 23668, USA
4LPC IN2P3/CNRS, Université Blaise Pascal, F-63170 Aubière Cedex, France
5Istituto Nazionale di Fiscica Nucleare, Sezione Sanità, 00161 Roma, Italy
6Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
7Kent State University, Kent, Ohio 44242, USA
8University of Kentucky, Lexington, Kentucky 40506, USA
9Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine
10University of Maryland, College Park, Maryland 20742, USA
11Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
12University of Massachusetts-Amherst, Amherst, Massachusetts 01003, USA
13University of New Hampshire, Durham, New Hampshire 03824, USA
14Old Dominion University, Norfolk, Virginia 23529, USA
15Princeton University, Princeton, New Jersey 08544, USA
16University of Regina, Regina, Canada SK S4S 0A2
17Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
18CEA Saclay, DAPNIA/SPHN, F-91191 Gif/Yvette, France
19Syracuse University, Syracuse, New York 13244, USA
20Temple University, Philadelphia, Pennsylvania 19122, USA
21Tohoku University, Sendai 980, Japan
22University of Virginia, Charlottesville, Virginia 22904, USA
23The College of William and Mary, Williamsburg, Virginia 23187, USA
24Yerevan Physics Institute, Yerevan 375036, Armenia
Received 23 June 2003; published 16 January 2004
We have measured the spin structure functions g1 and g2 of 3He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.058 GeV off a polarized 3He target at a 15.5° scattering angle. Excitation energies covered the resonance and the onset of the deep inelastic regions. We have determined for the first time the Q2 evolution of Γ1(Q2)=∫01g1(x,Q2)dx, Γ2(Q2)=∫01g2(x,Q2)dx, and d2(Q2)=∫01x2[2g1(x,Q2)+3g2(x,Q2)]dx for the neutron in the range 0.1≤Q2≤0.9 GeV2 with good precision. Γ1(Q2) displays a smooth variation from high to low Q2. The Burkhardt-Cottingham sum rule holds within uncertainties and d2 is nonzero over the measured range.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.022301
DOI:
10.1103/PhysRevLett.92.022301
PACS:
25.30.Rw, 11.55.Hx, 12.38.Qk, 24.70.+s
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