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HK: Hadronen und Kerne
HK 14: Electromagnetic Probes II
HK 14.3: Group Report
Monday, March 16, 1998, 18:00–18:30, B
Status of the GDH–experiment at MAMI — •A. Thomas1 and GDH–and A2 2 — 1Institut für Kernphysik, Universität Mainz, Becherweg 45, 55099 Mainz — 2
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 measures total and partial cross sections of
circularly
polarized photons on longitudinally polarized nucleons in the energy
range 140 – 800 MeV at MAMI and up to 2.3 GeV at ELSA.
The 4 π- detector used at MAMI has been calibrated in 1997 using
unpolarized liquid hydrogen and deuterium targets.
The experiment on the proton using a butanol frozen spin target built in Bonn
has been started at MAMI. A status report on the experiment will be given.