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Search: swepub > Örebro University > (1990-1994) > (1991)

  • Result 1-10 of 68
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1.
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2.
  • Doherty, Patrick, 1957-, et al. (author)
  • A non-monotonic fuzzy logic.
  • 1991
  • In: International Fuzzy Systems Association, Fourth World Congress,1991.
  • Conference paper (peer-reviewed)
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3.
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4.
  • Tham, Richard, et al. (author)
  • Vestibulotoxicity of organic solvents
  • 1991
  • In: Fourth international conference on combined effect of environmental factors. - : Johns Hopkins University. ; , s. 101-105
  • Conference paper (peer-reviewed)
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6.
  • Allasia, D, et al. (author)
  • Inelastic J ψ production in deep inelastic scattering from hydrogen and deuterium and the gluon distribution of free nucleons
  • 1991
  • In: Physics Letters B. - : Elsevier. - 0370-2693 .- 1873-2445. ; 258:3-4, s. 493-498
  • Journal article (peer-reviewed)abstract
    • We present results on inelastic J/PSI-production from muon interactions with hydrogen and deuterium at an incident muon energy of 280 GeV. The measured cross section ratio per nucleon for muon-induced J/PSI-production in deuterium and hydrogen was found to be R(D2/H2) = 1.01 +/- 0.15. The colour singlet model is shown to provide a good description of the observed differential cross section apart from a normalisation factor. The comparison between the observed cross section and the colour singlet model prediction allows the extraction of the gluon structure function G(chi) of the nucleon. The momentum fraction-chi of the nucleon carried by the gluon is measured in the range of chi = [0.02, 0.30]. The normalised gluon distribution of free nucleons thus found can be parametrised as chi-G(chi) = 1/2 (eta + 1)(1 - chi)eta, with eta = 5.1 +/- 0.9 (stat).
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7.
  • Amaudruz, P, et al. (author)
  • Gottfried sum from the ratio F2n/F2p
  • 1991
  • In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 66:21, s. 2712-2715
  • Journal article (peer-reviewed)abstract
    • Experimental results obtained at the CERN Super Proton Synchrotron on the structure-function ratio F2n/F2p in the kinematic range 0.004 < x < 0.8 and 0.4 < Q2 < 190 GeV2, together with the structure function F2d determined from a fit to published data, are used to derive the difference F2p(x) - F2n(x). The value of the Gottfried sum integral (F2p - F2n) dx/x = 0.240 +/- 0.016 is below the quark-parton-model expectation of 1/3.
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8.
  • Amaudruz, P, et al. (author)
  • Precision measurement of the structure function ratios F2He/F2D, F2C/F2D and F2Ca/F2D
  • 1991
  • In: Zeitschrift für Physik C Particles and Fields. - : Springer. - 0170-9739 .- 1431-5858. ; 51:3, s. 387-393
  • Journal article (peer-reviewed)abstract
    • We present the structure function ratios F2He/F2D, F2C/F2D and F2Ca/F2D measured in deep inelastic muon-nucleus scattering at an incident muon momentum of 200 GeV. The kinematic range 0.0035 < x < 0.65 and 0.5 < Q2 < 90 GeV2 is covered. At low x the three ratios are significantly smaller than unity and the size of the depletion grows with decreasing x and increasing mass number A. At intermediate x the ratios show an enhancement of about 2% above unity for C/D and Ca/D, possibly less for He/D. There are indications of some Q2 dependence in the Ca/D data. The integrals of the structure function differences F2A-F2D are discussed.
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9.
  • Ashman, J, et al. (author)
  • Forward produced hadrons in μp and μd scattering and investigation of the charge structure of the nucleon
  • 1991
  • In: Zeitschrift für Physik C Particles and Fields. - : Springer. - 0170-9739 .- 1431-5858. ; 52:3, s. 361-387
  • Journal article (peer-reviewed)abstract
    • Final data measured with the EMC forward spectrometer are presented on the production of forward charged hadrons in mu-p and mu-d scattering at incident beam energies between 100 and 280 GeV. The large statistic of 373000 events allows a study of the semi-inclusive hadron production as a function of z, p(T)2 and in small Q2, x(Bj) and W bins. Charge multiplicity ratios and differences as a function of z and x(Bj) are given for p, d and n-targets. From the differences of charge multiplicities the ratio of the valence quark distributions of the proton d-upsilon(x)/u-upsilon(x) is determined for the first time in charged lepton scattering. The Gronau et al. sum rule is tested, the measured sum being 0.31 +/- 0.06 stat. +/- 0.05 syst., compared with the theoretical expectation of 2/7 almost-equal-to 0.286. The measured sum corresponds to an absolute value of the ratio of the d and u quark charge of 0.44 +/- 0.10 stat. +/- 0.08 syst.
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  • Result 1-10 of 68
Type of publication
journal article (39)
conference paper (13)
book chapter (7)
reports (3)
book (3)
other publication (1)
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doctoral thesis (1)
research review (1)
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Type of content
peer-reviewed (44)
other academic/artistic (19)
pop. science, debate, etc. (5)
Author/Editor
Möller, Claes, 1950- (14)
Danielsson-Tham, Mar ... (10)
Lettenström, Frans, ... (4)
Ljungqvist, Olle, 19 ... (2)
Driankov, Dimiter, 1 ... (2)
Edvardsson, Bo, 1944 ... (2)
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Ledin, Torbjörn (2)
Amaudruz, P (2)
Zetsche, F (2)
Martini, A. (1)
Jonsson, P. (1)
Andersson, T. (1)
Larsson, S-E (1)
Ernerudh, Jan (1)
Lundberg, Lars (1)
von Euler, Mia, 1967 ... (1)
Nilsson Ekdahl, Kris ... (1)
Moritz, Ulrich (1)
Windmolders, R. (1)
Gardfjell, Maria (1)
Olsson, B (1)
Nilsson, Christer (1)
Holm, G (1)
Linton, Steven J., 1 ... (1)
Ledin, Per, 1962- (1)
Akner, Gunnar, 1953- (1)
Mossberg, K. (1)
Wikström, A. C. (1)
Sundqvist, K. G. (1)
Gustafsson, J. A. (1)
Agerberth, Birgitta (1)
Engwall, Magnus, 196 ... (1)
Ödkvist, Lars (1)
Allasia, D (1)
Lindblad, Per, 1953- (1)
Vrethem, M (1)
Lind, Göran (1)
Alston-Smith, J (1)
Ware, J (1)
Norrgren, L (1)
Jansson, E (1)
Stattin, Håkan, 1951 ... (1)
Harrison, Glenn W. (1)
Rutström, Elisabet, ... (1)
Elander, Ingemar, 19 ... (1)
Rundgren, M (1)
Larsby, Birgitta (1)
Tham, Richard (1)
Engvall, Anders (1)
Henrekson, Magnus (1)
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University
Linköping University (2)
Mid Sweden University (1)
Linnaeus University (1)
Language
English (41)
Swedish (25)
Finnish (2)
Research subject (UKÄ/SCB)
Social Sciences (22)
Natural sciences (10)
Medical and Health Sciences (6)
Humanities (3)
Agricultural Sciences (1)
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