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The dependence on Q 2 (the negative square of the 4-momentum of the exchanged virtual photon) of the generalised Gerasimov-Drell-Hearn integral for the proton has been measured in the range 1.2<space>GeV 2 <Q 2 <12<space>GeV 2 by scattering longitudinally polarised positrons on a longitudinally polarised hydrogen gas target. The contributions of the...
Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g n1 (x, Q 2 ) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3 He internal gas target. The data cover the kinematic range 0.023 < x < 0.6 and 1 (GeV/c) 2 < Q 2 < 15 (GeV/c)...
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