π−Photoproduction from Deuterium at Laboratory Energies 600 to 1250 MeV

The differential cross section for the reaction $\gamma +n\to {\pi }^{-}+p$ was measured for laboratory photon energies between 600 and 1250 MeV, using a liquid deuterium target. The internal nucleon momentum distribution of the deuteron was used to calculate the major effect of using deuterium as a neutron target. The data show that the amplitude to excite the $F_{15}\mathrm{}\left(1688\right)\mathrm{}$ resonance is small, in agreement with a recent quark-model prediction.