π+Photoproduction Between 1.2 and 3 GeV at Very Small Angles

Abstract

The reaction $\gamma +p\to {\pi }^{+}+n$ has been investigated for photon energies between 1.2 and 3 GeV and pion c.m. angles from 2.5 to 15°. The cross section is strongly peaked in the forward direction and shows resonance structure in the region of the ${N_{\frac{3}{2}}}^{*}\mathrm{}\left(1920\right)\mathrm{}$ and ${N_{\frac{1}{2}}}^{*}\mathrm{}\left(2190\right)\mathrm{}$.