Experimental study of the $\gamma p\to K^0{\mathrm{\Sigma }}^{+}$, $\gamma n\to K^0\mathrm{\Lambda }$, and $\gamma n\to K^0{\mathrm{\Sigma }}^0$ reactions at the Mainz Microtron

This work measured $d\sigma \mathrm{/}d\mathrm{\Omega }$ for neutral kaon photoproduction reactions from threshold up to a c.m.\ energy of 1855MeV, focussing specifically on the $\gamma p\to K^0{\mathrm{\Sigma }}^{+}$, $\gamma n\rightarrow K^0\Lambda$,and$\gamma n\rightarrow K^0 \Sigma^0$reactions\mathrm{.}Ourresultsfor$\gamma n\rightarrow K^0 \Sigma^0$ are the first-ever measurements for that reaction. These data will provide insight into the properties of $N^{\ast }$ resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $\pi N$ channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.