A2

Meson photoproduction has developed into a powerful tool to study the nucleons excitation spectrum and test effective quark models which operate in the non-perturbative regime of QCD. An insight into the $J^P$ configurations and isospin decompositions of the contributing resonances is gained by measuring a minimal set of polarization observables on both the proton and the neutron. Single $\pi^0$ and $\eta$-photoproduction off a transversally polarized D-butanol target has been measured with circularly polarized bremsstrahlung photons generated by the MAMI-C electron microtron. With the nearly $4\pi$ acceptance of the combined Crystal Ball/TAPS setup the double polarization observable $F$ and the target asymmetry $T$ can be extracted for the first time for polarized, quasi-free neutrons over a wide energy and angular range.