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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadronenstruktur und -spektroskopie

HK 1.4: Vortrag

Montag, 17. März 2014, 15:15–15:30, HZ 1+2

F Observable in Double π⁰-Photoproduction — •Stefanie Garni for the A2 collaboration — Departement of Physics, University of Basel, CH-4056 Basel, Switzerland

The measurement of single and double polarization observables gives information about the different resonance contributions in the cross section and hence leads to a better understanding of the nucleon and its excited states. The double π⁰-photoproduction is one of the most interesting reaction for the measurement of these observables. It allows to search for excited nucleon states which decay preferentially via cascades involving intermediate excited states. Furthermore, the background from non-resonant terms is small since the photon does not couple directly to neutral pions.

Double π⁰-photoproduction off a transversally polarizied H-Butanol target has been measured using circularly polarizied bremsstrahlung photons produced by MAMI-C with incident energies up to 1.5 GeV. The double π⁰ reaction was identified using a combined setup of the Crystal Ball colorimeter and a TAPS forward wall which results in an almost 4π acceptance. Preliminary results on the single polarization observable T and double polarization observable F will be presented.