Abstract
A direct measurement of the helicity dependence of the total photoabsorption cross section on the proton was carried out at MAMI (Mainz) in the energy range 200<Eγ<800MeV. The experiment used a 4π detection system, a circularly polarized tagged photon beam, and a frozen spin target. The contributions to the Gerasimov-Drell-Hearn sum rule and to the forward spin polarizability γ0 determined from the data are 226±5(stat)±12(syst)μb and −187±8(stat)±10(syst)×10−6fm4, respectively, for 200<Eγ<800MeV.Received 13 March 2001DOI:https://doi.org/10.1103/PhysRevLett.87.022003©2001 American Physical Society
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