Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Hadronenstruktur und -spektroskopie

HK 15.6: Talk

Tuesday, March 20, 2012, 18:00–18:15, P 1

Measurement of the Double Polarization Observable E in Photoproduction of η and 2π⁰ Mesons off Quasi-Free Protons and Neutrons — •Lilian Witthauer and Manuel Dieterle — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

Meson-Photoproduction is widely used to investigate the properties of the nucleon and its excited states. Since the nucleon resonances are broad and overlapping, it is very difficult to unravel the different resonance contributions. An adequate Partial Wave Analysis that would yield the complete information about any reaction requires the determination of single and double polarization observables. In case of the free proton such experimental programs are well developed at the JLAB, ELSA, and MAMI facilities, while so far much less is known for the neutron, which can be studied only in quasi-free production reactions off light nuclei.
We will present very preliminary results of an ongoing experiment with the Crystal-Barrel/TAPS setup at the ELSA electron accelerator facility in Bonn to determine the double polarization observable E in photoproduction of η and 2π⁰ mesons of protons and neutrons, using a polarized D-butanol target.