Abstract
The Gerasimov-Drell-Hearn (GDH) sum rule connects the helicity dependent photoabsorption cross section with the anomalous magnetic moment of the nucleon. The GDH-collaboration is measuring the total cross section of circularly polarized photons with longitudinally polarized protons to check this sum rule experimentally to do a further progress in the investigation of the spin structure of the nucleon. The experiment has been started using the polarized electron beam of the Mainz electron accelerator MAMI in the energy range 200 – 800 MeV and will be continued at the Bonn accelerator ELSA up to an energy of about 3 GeV. We have finished the datav taking period at MAMI for the proton in august 98. A frozen spin target has been integrated into the 4π-detector DAPHNE. The experimental setup at MAMI will be described and first preliminary results will be shown.
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