Measurement of the neutron spin structure function g(1)(n) with a polarized He-3 internal target

K. Ackerstaff*, A. Airapetian, I. Akushevich, N. Akopov, M. Amarian, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, M. Beckmann, S. Belostotski, J.E. Belz, T. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. BottcherA. Borissov, J. Brack, B. Braun, B. Bray, W. Bruckner, A. Brull, E.E.W. Bruins, H.J. Bulten, G.P. Capitani, P. Carter, E. Cisbani, G.R. Court, P.P.J. Delheij, E. Devitsin, C.W. deJager, E. DeSanctis, D. DeSchepper, P.K.A.D. Huberts, M. Duren, A. Dvoredsky, G. Elbakian, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, H.T. Fortune

*Corresponding author for this work

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Abstract

Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g(1)(n)(x, Q(2)) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized He-3 internal gas target. The data cover the kinematic range 0.023 < x < 0.6 and 1 (GeV/c)(2) < Q(2) < 15 (GeV/c)(2). The integral integral(0.023)(0.16)g(1)(n)(x) dx evaluated at a fixed Q(2) of 2.5 (GeV/c)(2) is -0.034+/-0.013(stat.)+/-0.005(syst.). Assuming Regge behavior at low x, the first moment Gamma(1)(n) = integral(0)(1)g(1)(n)(x) dx is -0.037+/-0.013(stat.)+/-0.005(syst.)+/-0.006(extrapol.). (C) 1997 Published by Elsevier Science B.V.
Original languageEnglish
Pages (from-to)383-389
Number of pages7
JournalPhysics Letters B
Volume404
Issue number3-4
DOIs
Publication statusPublished - 10 Jul 1997
Externally publishedYes

Keywords

  • DEEP-INELASTIC-SCATTERING
  • STRUCTURE-FUNCTION G1(X)
  • PRECISION-MEASUREMENT
  • SUM-RULE
  • PROTON
  • DEUTERON
  • ASYMMETRY
  • LEPTONS
  • NUCLEI
  • LASER

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