Abstract
In the study of the spin dependent reactions on the nucleon, there is a special interest in the experimental verification of the Gerasimov-Drell-Hearn (GDH) sum rule. This sum rule relates static properties of the nucleon, the anomalous magnetic moment and the mass, to the difference of the total photoabsorption cross sections for circularly polarized photons on longitudinally polarized nucleons. This chapter presents the measurements of the helicity dependence of photon induced reactions on the proton in the energy range from 200 up to 800 MeV. The experiments are performed at the Mainz accelerator facility MAMI. A 4π detector system, a circularly polarized tagged photon beam and a newly developed polarized solid target are used. The horizontaldilution refrigerator includes a thin superconducting coil to maintain the polarization of the protons in the frozen-spin mode longitudinal to the incoming photon beam. The data obtained provide new information for multipole analyses of pion photoproduction, and give contributions to the GDH sum rule and the forward spin polarizability.
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