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Sökning: WFRF:(De Bock K) > (2003-2004)

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1.
  • von Hellermann, M, et al. (författare)
  • Pilot experiments for the International Thermonuclear Experimental Reactor active beam spectroscopy diagnostic
  • 2004
  • Ingår i: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 75:10, s. 3458-3461
  • Tidskriftsartikel (refereegranskat)abstract
    • Supporting pilot experiments and activities which are currently considered or already performed for the development of the International Thermonuclear Experiment Reactor active beam spectroscopy diagnostic are addressed in this article. Four key issues are presented including optimization of spectral instrumentation, feasibility of a motional Stark effect (MSE) evaluation based on line ratios, "first-mirror" test-bed experiments at the tokamak TEXTOR, and finally the role of integrated data analysis for the conceptual layout of the change exchange recombination spectroscopy and MSE diagnostic.
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2.
  • Dutz, H, et al. (författare)
  • Experimental check of the Gerasimov-Drell-Hearn sum rule for H-1
  • 2004
  • Ingår i: Physical Review Letters. - 1079-7114. ; 93:3
  • Tidskriftsartikel (refereegranskat)abstract
    • For the first time we checked the fundamental Gerasimov-Drell-Hearn (GDH) sum rule for the proton experimentally in the photon energy range from 0.2-2.9 GeV with the tagged photon facilities at MAMI (Mainz) and ELSA (Bonn). New data of the doubly polarized total cross section difference are presented in the energy range from 1.6 to 2.9 GeV. The contribution to the GDH integral from 0.2-2.9 GeV yields [254+/-5(stat)+/-12(syst)] mub with negative contributions in the Regge regime at photon energies above 2.1 GeV. This trend supports the validity of the GDH sum rule.
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3.
  • Dutz, H, et al. (författare)
  • First measurement of the Gerasimov-Drell-Hearn sum rule for H-1 from 0.7 to 1.8 GeV at ELSA
  • 2003
  • Ingår i: Physical Review Letters. - 1079-7114. ; 91:19: 192001
  • Tidskriftsartikel (refereegranskat)abstract
    • To verify the fundamental Gerasimov-Drell-Hearn (GDH) sum rule for the first time experimentally, we measured the helicity dependent total photoabsorption cross section with circularly polarized real photons and longitudinally polarized nucleons in the photon energy range 0.68-1.82 GeV with the tagged photon facility at ELSA. The experiment was carried out with a 4pi detection system, a circularly polarized tagged photon beam, and a frozen spin polarized proton target. The contribution to the GDH sum rule in this photon energy range is [49.9+/-2.4(stat)+/-2.2(syst)] mub.
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  • Resultat 1-3 av 3

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