Cross-section measurement of the $\gamma n \rightarrow \pi^- p$ process from deuterium

Photopion production from nucleons are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. There are few previous measurements of $\pi^{-}$ photo-production above photon energies of 2 GeV. Data taken during the CLAS g10 running period cover a significantly extended range of kinematics. We carried out an analysis of the $\gamma n \rightarrow \pi^- p$ process for photon energies between 1 to 3.5 GeV and pion center-of-mass angles between $50^{\circ}$ to $150^{\circ}$. Preliminary results are extracted and will be presented in this talk.