Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 4: Electromagnetic Probes I, Photoproduction

HK 4.2: Group Report

Monday, March 16, 1998, 14:30–15:00, B

First experiments with the A1 focal plane proton-polarimeter^* — •Th. Pospischil — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, J.J.-Becher-Weg 45, D-55099 Mainz

For the measurement of the recoil proton polarization in coincidence experiments with the three spectrometer-facility, the A1 collaboration at the Mainzer Mikrotron (MAMI) set up a proton polarimeter in the focal plane of one of the spectrometers. It makes use of the azimuthal asymmetry in the inclusive scattering of polarized protons off a carbon analyzer.
Elastic electron-proton scattering p(e^→,e′p^→), where the polarization transfer to the proton is known, enabled both the calibration of the detector system and the investigation of the spin precession in the magnetic fields of the QSDD-Spectrometer.
A first double polarization experiment p(e^→,e′p^→)π⁰ aims at the measurement of the C2-quadrupole contribution in the N→Δ transition at a four-momentum transfer of Q² = 0.12 GeV².
^* Supported by the Deutsche Forschungsgemeinschaft (SFB 201).