Experiment to detect quark effects in nuclei

We propose to study inside the nuclei the leptonic decay (${\mathit{e}}^{+}$ ${\mathit{e}}^{\mathrm{-}}$) of light meson vector ρ, to detect the effect of coupling of nuclear field with a qq¯. If the effect exists we must observe a downward shift (≃120 MeV) in the invariant mass spectrum of the lepton pair. We give a prediction of the distribution expected in future experiments.