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HK: Physik der Hadronen und Kerne

HK 27: Electromagnetic and Hadronic Probes IV

HK 27.1: Gruppenbericht

Mittwoch, 10. März 2004, 10:45–11:15, E

GDH sum rule completed up to 3 GeV — •Jochen Krimmer — Physikalisches Institut der Universität Tübingen, Germany

The GDH sum rule connects helicity dependent total photoabsorption cross sections with static properties of the nucleon like the mass and the anomalous magnetic moment. Experiments for its direct experimental check have been performed at the tagged photon facilities of the electron accelerators MAMI and ELSA. Circularly polarized photons have been used together with a longitudinally polarized nucleon target and 4π detector systems. As the experiments cover an energy range from 200 MeV to 3 GeV, double polarized photoabsorption cross sections are available for the first time from the resonance region to the onset of Regge behaviour. Furthermore, exploratory data have been taken on the neutron with a polarized ⁶LiD target.
This work is supported by DFG under contract GRK683 & GR1084/5-1.