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We have measured the nuclear transparency of the incoherent diffractive$A(e,e'\rho^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$Husing a 5 GeV electron beam. The nuclear transparency, the ratio of theproduced $\rho^0$'s on a nucleus relative to deuterium, which is sensitive to$\rho A$ interaction, was studied as function of the coherence length ($l_c$),a lifetime of the hadronic fluctuation of the virtual photon, and thefour-momentum transfer squared ($Q^2$). While the transparency for both$^{12}$C and $^{56}$Fe showed no $l_c$ dependence, a significant $Q^2$dependence was measured, which is consistent with calculations that includedthe color transparency effects.

Evidence for the Onset of Color Transparency in $\rho^0$ Electroproduction off Nuclei