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Electro-production of pions and kaons at the kinematics of quasi-elastic knockout (which is well known in the physics of atomic nucleus and corresponds to the t-pole diagram) is proposed for obtaining their momentum distribution (MD) in various channels of virtual decay N → B +π, B = N , ∆, N * , N * * , and N → Y +K, Y = Λ, Σ. It is a powerful tool for investigation of a quark microscopic picture of the meson cloud in the nucleon. A model of scalar qq ( 3 P 0 ) fluctuation in the non-trivial QCD vacuum is used to calculate pion and kaon momentum distributions (MD) in these channels. 1 In the constituent quark model the pion charge radius includes contributions both quarks and the ρ-meson pole (the vector meson dominance model): [< r 2 π > ch ] 1/2 = [3b 2 π /4 + 6/m 2 ρ ] 1/2 ≃ 0.68 fm.

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Developed earlier concept of quasielastic knock out of pions from nucleons by high-energy electrons is propounded as a tool for checking microscopical model ( 3 P 0 -fluctuation ) for decay of N to different channels π + B and Preparata model of nucleus structure. *