DETERMINATION OF THE $omega$ $Yields$ $pi$$sup +$$pi$$sup -$ DECAY AMPLITUDE FROM PHOTOPRODUCTION.

Interference between ${\ensuremath{\rho}}^{0}$ and $\ensuremath{\omega}$ photoproduced from carbon, aluminum, and lead has been studied in the $2\ensuremath{\pi}$ decay mode. The branching ratio $\frac{(\ensuremath{\omega}\ensuremath{\rightarrow}2\ensuremath{\pi})}{(\ensuremath{\omega}\ensuremath{\rightarrow}3\ensuremath{\pi})}$ is 2.8 \ifmmode\pm\else\textpm\fi{} 0.6%. The phase difference between the decay amplitudes $\ensuremath{\omega}\ensuremath{\rightarrow}2\ensuremath{\pi}$ and ${\ensuremath{\rho}}^{0}\ensuremath{\rightarrow}2\ensuremath{\pi}$ is 63\ifmmode^\circ\else\textdegree\fi{} \ifmmode\pm\else\textpm\fi{} 16\ifmmode^\circ\else\textdegree\fi{}.