For the combined setup of the Crystal Barrel and TAPS at ELSA in Bonn we have proposed to study the reaction \gamma p \rightarrow K0 \Sigma+. The reaction is characterised by the final state of 6 photons and a forward emitted proton. Here we report on results of simulations to demonstrate the feasibility of the experiment. From the threshold behaviour of the cross section and angular distributions we aim to search for a 3rd S11 resonance just above the K \Sigma threshold, which may mix with the two lower lying S11 resonances and thus provide an explanation for the unusually strong \eta branching of the S11(1535) resonance. The hyperon polarisation can be studied as a sensitive tool to determine the various resonance admixtures.
PACS numbers: 25.20.Lj, 13.30.Eg, 13.60.Le, 13.60.Rj
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