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Q^2 Evolution of the Neutron Spin Structure Moments using a ^3He Target

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. doi:10.1103/PhysRevLett.92.022301.

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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.

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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.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
European INTAS FoundationUNSPECIFIED
Commissariat à l’Energie Atomique (CEA) (France)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS) (France)UNSPECIFIED
Conseil Régional d'AuvergneUNSPECIFIED
Department of Energy (DOE)DE-AC05-84ER40150
Issue or Number:2
Classification Code:PACS: 25.30.Rw, 11.55.Hx, 12.38.Qk, 24.70.+s
Record Number:CaltechAUTHORS:20110708-141313108
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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.
ID Code:24345
Deposited By: Ruth Sustaita
Deposited On:11 Jul 2011 17:10
Last Modified:09 Nov 2021 16:22

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