First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV

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 < E_gamma < 800 MeV. The experiment used a 4$\pi$ 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 ${\gamma }_0$ determined from the data are 226 \pm 5 (stat)\pm 12(sys) μb and -187 \pm 8 (stat)\pm 10(sys)10^{-6} fm^4, respectively, for 200 < E_γ< 800 MeV.

6 pages, 3 figures, 3 tables

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