Deep inelastic scattering of polarized electrons by polarized 3He and the study of the neutron spin structure

P. L. Anthony, R. G. Arnold, H. R. Band, H. Borel, P. E. Bosted, V. Breton, G. D. Cates, T. E. Chupp, F. S. Dietrich, J. Dunne, R. Erbacher, J. Fellbaum, H. Fonvieille, R. Gearhart, R. Holmes, E. W. Hughes, J. R. Johnson, D. Kawall, C. Keppel, S. E. KuhnR. M. Lombard-Nelsen, J. Marroncle, T. Maruyama, W. Meyer, Z. E. Meziani, H. Middleton, J. Morgenstern, N. R. Newbury, G. G. Petratos, R. Pitthan, R. Prepost, Y. Roblin, S. E. Rock, S. H. Rokni, G. Shapiro, T. Smith, P. A. Souder, M. Spengos, F. Staley, L. M. Stuart, Z. M. Szalata, Y. Terrien, A. K. Thompson, J. L. White, M. Woods, J. Xu, C. C. Young, G. Zapalac

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367 Scopus citations


The neutron longitudinal and transverse asymmetries An1 and An2 have been extracted from deep inelastic scattering of polarized electrons by a polarized 3He target at incident energies of 19.42, 22.66, and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions gn1(x, Q2) and gn2(x, Q2) over the range 0.03<x<0.6 at an average Q2 of 2 (GeV/c)2. The data are used for the evaluation of the Ellis-Jaffe and Bjorken sum rules. The neutron spin structure function gn1(x, Q2) is small and negative within the range of our measurement, yielding an integral ∫0.030.6gn1(x)dx=-0.028±0.006 (stat)±0.006 (syst). Assuming Regge behavior at low x, we extract Γn1=∫01gn1(x)dx=-0.031±0.006 (stat)±0.009 (syst). Combined with previous proton integral results from SLAC experiment E143, we find Γp1n1=0.160±0.015 in agreement with the Bjorken sum rule prediction Γp1n1=0.176±0.008 at a Q2 value of 3 (GeV/c)2 evaluated using αs=0.32±0.05.

Original languageEnglish (US)
Pages (from-to)6620-6650
Number of pages31
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - 1996

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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