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Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 26: Electromagnetic and Hadronic Probes III

HK 26.1: Group Report

Wednesday, March 13, 2002, 10:45–11:15, D

Electromagnetic structure of the nucleon investigated by free and quasi-free Compton scattering — •Martin Schumacher, Karsten Kossert, Marcus Camen und Frank Wissmann — Zweites Physikalisches Institut der Universität, Bunsenstraße 7–9, D-37073 Göttingen

The electromagnetic structure of the nucleon may be parameterized through amplitudes for one pion photoproduction or through invariant amplitudes for Compton scattering. In addition structure constants are used having a straightforward physical interpretation. These structure constants are the E2/M1 ratio of the p → Δ transition, the electromagnetic polarizabilities α and β and the spin polarizabilities γ0 and γπ. Recently, these structure constants have been measured at MAMI (Mainz) by Compton scattering at the free proton and the proton and neutron bound in the deuteron using different experimental setups. It is reported about the experiments and about new results for the backward spin polarizability γπ and the electromagnetic polarizabilities α and β for the proton and the neutron.

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