Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy VI

HK 33.4: Talk

Wednesday, March 16, 2016, 15:15–15:30, S1/01 A5

Helicity asymmetry of the single π⁰ photoproduction on neutron — •Federico Cividini for the A2 collaboration — Institut für Kernphysik - Universität Mainz

During the pion production reaction, the nucleon is excited to an intermediate resonant state, and a systematic analysis of the experimental data allows a determination of the main properties of the baryon resonances. A detailed knowledge of the spectrum of nucleon excited states gives essential constraints on models of nucleon structure. The data for the observables accessible using a polarised photon beam and/or polarised nucleon targets are scarce in many channels, especially in those induced on the neutron. A measurement is performed at the Mainz Microtron, using a circularly polarised photon beam and longitudinally polarised proton and deuteron targets. The detector is the large acceptance Crystal Ball/TAPS setup.

The talk gives an overview of the status of the experiment and the preliminary results of the helicity asymmetry of the single π⁰ photoproduction reaction from the deuteron target.

Supported by DFG under contract SFB1044

Supported by Carl-Zeiss-Stiftung