MAINZ-GDH()
A NOVEL CLASS POLARIZED PHOTOHADRONIC EXPERIMENT
The scientific objectives of the GDH collaboration are the examination of the Gerasimov-Drell-Hearn (GDH) sum rule and in more general terms the study of polarized photon cross sections in a wide photon energy region from 140 MeV up to 3000 MeV. Particulary the helicity dependencies of all one- and two-pion photoproduction channels on the proton an neutron are of prominent interest. To cover a wide range of photon energies, the experiments are carried out at the accelerator facilities MAMI B at Mainz (Germany) and ELSA at Bonn (Germany). MAMI B covers the energy range 140 <= n <= 800 MeV, ELSA covers the energy range 500 <= n <= 3000 MeV. Both facilities provides polarized electron beams of high quality and degree of polarization which are converted to circularly polarized, real photons by the helicity transfer in the bremsstrahlungs process of longitudinally polarized electrons on an amorphous radiator.
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