Helicity dependence of single neutral pion photoproduction on deuteron

During the pion production reaction, the nucleon is excited to an intermediate resonant state, and a complete analysis of the experimental data gives 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 for 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 systematic measurement of all different observables is under way at the the Mainz facility by the A2 rate at MAMI collaboration. This talk focuses on the measurement performed at the Mainz Microtron using a circularly polarised photon beam and longitudinally polarised proton and deuteron target in combination with the large acceptance Crystal Ball/TAPS detection setup. An overview of the status of the experiment is given together with the preliminary results of the helicity asymmetry of the single π⁰ photoproduction reaction from the deuteron target.