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RESEARCH PRODUCT

Physics at the electron accelerator MAMI

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Abstract An overview of physics at the Mainz Microtron facility MAMI is given. After a short description of the essential parameters of the accelerator, selected results of three different collaborations A1, A2, and A3, each centered around one major experimental facility, are presented. The A1 collaboration has installed a setup of three large acceptance magnetic spectrometers. Results presented are high momentum components (pm ≤ 700MeV/c) in 16O(e, e′p), L T separation and LT interference structure functions in p(e, e′π+), and angular distribution of p(e, e′p)π0 at π0 threshold. The A2 collaboration has installed a broad band tagger for experiments with nonpolarized and polarized photons. Results presented include p(γ, π+π0) in the Δ(1232)P33 region, p(γ, π0π0) at threshold, p(γ, η) from threshold into the N(1535)S11 resonance region, and a measurement of the E 2 M 1 ratio for the Δ(1232)P33 resonance using polarized photons. The A3 collaboration has built a source of polarized electrons and a flexible setup to measure the 3 H e( e , e′n) and d( e , e′ n ) reaction in quasifree kinematics. From the asymmetries measured in these reactions a value for GE,n at q2 = −0.31(GeV/c)2 is extracted. A forth collaboration A4 is setting up a large solid angle, high count rate liquid Xe calorimeter in order to investigate parity violating electron scattering.