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[en] The structure functions g1p and g1n have been measured over the range 0.014 < x < 0.9 and 1 < Q2 < 40 GeV2 using deep-inelastic scattering of 48 GeV longitudinally polarized electrons from polarized protons and deuterons. We find that the Q2 dependence of g1p (g1n) at fixed x is very similar to that of the spin-averaged structure function F1p (F1n). From a NLO QCD fit to all available data we find Gamma1p Gamma1n=0.176 ± 0.003 ± 0.007$ at Q2=5 GeV2, in agreement with the Bjorken sum rule prediction of 0.182 ± 0.005
Journal
Physics Letters. Section B; ISSN 0370-2693; 
; v. 493; p. 10
; v. 493; p. 10