[en] Proton production in proton-nucleus interactions is considered in the framework of coherent flucton model. The angular dependence of relativistically invariant structure function is compared With the calculated one obtained within the Weber-Miller model without the interaction in a final state, the momentum distribution of nucleons in a nucleus being correspondent to the coherent flucton model proposed. The limit variant of direct interaction proposed by Amado and Voloshin is also considered. The calculations reproduce well experimental data extrapolated to the 180 deg angle and transmit correctly the general behaviour of the cross section in dependence on the energy of proton observed. The obtained absolute values of cross sections depend on a specific type of momentum distribution (the presence of high momentum components)