Measurement of the neutron spin structure function gn1 with a polarized 3He 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. BöttcherA. Borissov, J. Brack, B. Braun, B. Bray, W. Brückner, A. Briill, 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. de Jager, E. de Sanctis, D. de Schepper, P. K.A. de Witt Huberts, M. Düren, A. Dvoredsky, G. Elbakian, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, J. Franz, S. Frullani, M. A. Funk, N. D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, P. Geiger, V. Gharibyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, J. O. Hansen, D. Hasch, O. Häusser, R. S. Henderson, T. Henkes, R. Hertenberger, Y. Holler, R. J. Holt, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C.R. Makins, S. I. Manaenkov, F. K. Martens, J. W. Martin, A. Mateos, K. Mcllhany, R. D. McKeown, F. Meissner, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W. D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O'Neill, R. Openshaw, V. Papavassiliou, S. F. Pate, M. Pitt, S. Potashov, D. H. Potterveld, B. Povh, G. Rakness, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, G. Röper, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, K. P. Schüler, A. Schwind, T. A. Shibata, T. Shin, A. Simon, K. Sinram, W. R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. M. Thiessen, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, R. van de Vyver, J. FJ van den Brand, G. van der Steenhoven, M. C. Vetterli, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, T. Wölfel, K. Zapfe-Düren, H. Zohrabian, R. Zurmühle

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Abstract

Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function gn1(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The data cover the kinematic range 0.023 < x < 0.6 and 1 (GeV/c)2 < Q2 < 15 (GeV/c)2. The integral ∫0.60.023 gn1(x) dx evaluated at a fixed Q2 of 2.5 (GeV/c)2 is -0.034 ± 0.013(stat.) ±0.005(syst.). Assuming Regge behavior at low x, the first moment Γn1 = ∫10 gn1(x) dx is -0.037 ± 0.013(stat.) ±0.005(syst.) ±0.006(extrapol.).

Original languageEnglish
Pages (from-to)383-389
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume404
Issue number3-4
DOIs
Publication statusPublished - 1997 Jul 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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