Abstract. On the basis of non-relativistic theory in the distorted-wave approximation in three dimensions, a theory of from nuclei by nucleons of intermediate energies has been developed. On the baizing on this theory the differential cross sections of quasielastic knock-out reactions of protons with shells 1 , 1   in the nucleus and  have been calculated, which allows to determine the orbital momentum of the nucleons in the nucleus before scattering by the angular distribution of emitted protons.Keywords: Reaction A (p, 2p)B, distorted-wave approximation, and  nuclei.