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The recent precise experimental results for the photoproduction of$\eta$-mesons off the neutron measured with the Crystal Ball/TAPS calorimeterat the MAMI accelerator have been investigated in detail in the framework ofthe Bonn-Gatchina coupled channel model. The main result is that the narrowstructure observed in the excitation function of $\gamma n \rightarrow n\eta$can be reproduced fully with a particular interference pattern in the$J^P=1/2^-$ partial wave. Introduction of the narrow resonance $N(1685)$ withthe properties reported in earlier publications deteriorates the quality of thefit.

Interference phenomena in the $J^P=1/2^-$-wave in $\eta$ photoproduction