Amarian, M. and Gao, J. and Goldberg, E. and Hughes, E. and Jensen, S. and Jones, G. and McKeown, R. and Pavlin, T. and Pripstein, D. (2004) Q^2 Evolution of the Neutron Spin Structure Moments using a ^3He Target. Physical Review Letters, 92 (2). Art. No. 022301. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20110708-141313108
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We have measured the spin structure functions g_1 and g_2 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 Q^2 evolution of Γ_1(Q^2)=∫_0^1g_1(x,Q^2)dx, Γ_2(Q^2)=∫_0^1g_2(x,Q^2)dx, and d_2(Q^2)=∫_0^1x^2[2g_1(x,Q^2)+3g_2(x,Q^2)]dx for the neutron in the range 0.1 ≤ Q^2 ≤0.9 GeV^2 with good precision. Γ_1(Q^2) displays a smooth variation from high to low Q^2. The Burkhardt-Cottingham sum rule holds within uncertainties and d_2 is nonzero over the measured range.
|Additional Information:||© 2004 The American Physical Society. Received 23 June 2003; published 16 January 2004. This work was supported by the U.S. Department of Energy (DOE), the U.S. National Science Foundation, the European INTAS Foundation, and the French CEA, CNRS, and Conseil Régional d’Auvergne. The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the DOE under Contract No. DE-AC05-84ER40150.|
|Classification Code:||PACS: 25.30.Rw, 11.55.Hx, 12.38.Qk, 24.70.+s|
|Official Citation:||Q2 Evolution of the Neutron Spin Structure Moments using a 3He Target M. Amarian et al. (Jefferson Lab E94010 Collaboration) Published 16 January 2004 (5 pages) 022301|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||11 Jul 2011 17:10|
|Last Modified:||26 Dec 2012 13:22|
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