Two proton knockout from carbon using linearly polarised photons

The ^(12)C([gamma],pp) reaction has been studied in the photon energy range E_=200-450MeV at the Mainz Microtron, MAMI. The linearly polarised photon beam was produced via the coherent bremsstrahlung technique with a diamond radiator and tagged with the Glasgow Tagging Spectrometer. The beam was incident on a ^(12)C target and the reaction products were detected in the 4pi Crystal Ball detector. The experimental study examines the photon asymmetry Sigma over a wider photon energy range than previous measurements and presents the first measurement of the angular dependence of Sigma. The photon asymmetry has a negative magnitude for missing energies Em 300MeV, Sigma has a substantially negative value which is attributed to two-step reactions following initial quasifree pion production