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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

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