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The total and topological 4 Hep cross sections as well as the cross sections of the separate αp interaction channels and the differential cross sections dσ dt of the elastic αp scattering were measured using the 2m hydrogen bubble chamber exposed to a separated beam of α particles from the ITEP synchrotron at 5 GeV/c (the kinetic energy of the initial protons in the nuclear rest frame was T p = 620 MeV). The data obtained have been compared with the results of the previous experiments and with the theoretical predictions based on the Glauber-Sitenko multiplescattering theory.The systematic investigations of the nuclear reactions in the few-nucleon systems at intermediate energies have been carried out in ITEP for the last few years by making use of the lightest nuclei ( 3 H, 3 He, 4 He) as a beam and a liquid-hydrogen bubble chambers (80 cm and 2 m) as a target (see e.g. [1] for bibliography and background). In [1] we reported the data on the cross sections of 4 He interaction with protons and αp-elastic scattering below the pion production threshold in the elementary NN process. The momentum of the 4 He nuclei averaged over the bubble chamber fiducial volume was equal to 2.7 GeV/c (the kinetic energy of the initial protons in the nuclear rest frame was T p = 220 MeV). Now we 1

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