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Geiges, R. Neuhausen, S. Derber, S. Hedicke, S. Sirca, S.S. Kamalov, Th. Pospischil, Th Walcher, U. Mueller","submitted_at":"2000-10-31T13:33:17Z","abstract_excerpt":"The recoil proton polarization has been measured in the p (\\vec e,e'\\vec p) pi^0 reaction in parallel kinematics around W = 1232 MeV, Q^2 = 0.121 (GeV/c)^2 and epsilon = 0.718 using the polarized c.w. electron beam of the Mainz Microtron. Due to the spin precession in a magnetic spectrometer, all three proton polarization components P_x/P_e = (-11.4 \\pm 1.3 \\pm 1.4) %, P_y = (-43.1 \\pm 1.3 \\pm 2.2) %, and P_z/P_e = (56.2 \\pm 1.5 \\pm 2.6) % could be measured simultaneously. 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