Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 6: Hadronenstruktur und -spektroskopie
HK 6.4: Vortrag
Montag, 4. März 2013, 12:00–12:15, HSZ-304
Measurement of σ1/2 and σ3/2 in Photoproduction of η and 2π0 Mesons off Protons and Neutrons — •Manuel Dieterle — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
The excitation spectrum of meson photoproduction consists of many broad and overlapping nucleon resonances. The identification of the relevant amplitudes and therefore of the quantum numbers of a prospective nucleon resonance requires the measurement of single and double polarisation observables. Due to the different isospin dependence of the electromagnetic interactions the resonance contributions to the cross sections on the proton differ from those on the neutron. Whereas in the case of the free proton the experimental programs are already well established, new programs using deuterated butanol as neutron targets are running in parallel at the electron accelerator facilities MAMI in Mainz and ELSA in Bonn.
We will present preliminary results of an experiment with the Crystal-Barrel/TAPS setup at ELSA using a longitudinally polarised deuterated butanol target and a circularly polarised tagged photon beam. The measurement of the helicity dependent cross sections σ1/2/σ3/2 (photon and target spin antiparallel/parallel), allows a first interpretation of the resonance contributions.
Supported by Swiss National Fund and DFG