  A high-statistics experiment on a deuterium target was performed using a real
photon beam with energies up to 3.6 GeV at the CLAS detector of Jefferson Lab.
The reaction reported here is for $\gamma d \to p K^- K^+ n$ where the neutron
was identified using the missing mass technique. No statistically significant
narrow peak in the mass region from 1.5-1.6 GeV was found. An upper limit on
the elementary process $\gamma n \to K^- \Theta^+$ was estimated to be about
4-5 nb, using a model-dependent correction for rescattering determined from
$\Lambda$(1520) production. Other reactions with less model-dependence are
being pursued.
