The total and topological 4Hep cross sections, as well as the cross sections for individual αpinteraction channels and the differential cross sections dσ/dt for elastic αp scattering, were measured by using a 2-m hydrogen bubble chamber exposed to a separated beam of 5-GeV/cα particles from the ITEP synchrotron (the kinetic energy of initial protons in the nuclear rest frame was Tp=620 MeV). The data obtained are compared with the results of previous experiments and with theoretical predictions based on Glauber-Sitenko multiple-scattering theory.

The 2-meter liquid-hydrogen bubble chamber is exposed to a separated beam of α particles from the ITEP synchrotron. The momentum of the incident 4He nuclei, averaged over the fiducial volume of the chamber, is 5 GeV/c (the kinetic energy of initial protons in the nucleus rest frame is T p =620 MeV). The spectral functions of decays α→tp and α→τn) are extracted in the 4π geometry (the latter is extracted for the first time) from the exclusive reactions αp→tpp and αp→τpn in the spectator momentum region 0<q<0.3 GeV/c. The pole dominance criteria are carefully checked. Extrapolation of the nuclear vertex function to the pole gives a lower bound on the nuclear vertex constant. Our experimental data are compared with the results of other studies and with theoretical calculations.

The underlying mechanisms of the reactions alpha p --> tpp and alpha p --> tau pn are studied. Data from the ITEP two-meter bubble chamber filled with liquid hydrogen and irradiated by a 2.7-GeV/c separated a-particle beam are analyzed. The total cross sections for the two reactions are estimated at 20.7 +/- 0.4 and 34.4 +/- 0.4 mb, respectively. The phase-space domains in which quasifree scattering and final-state interactions play leading roles are isolated. The angular, momentum, and invariant-mass distributions of secondary particles are obtained over the entire allowed kinematic range. In the region of quasifree scattering, the data are compared with the pole-model predictions.

The deuteron momentum distribution rho(dd)(q) in the He-4 nucleus has been obtained for the first time from the data on the reaction (4)Hep --> pdd for an incident He-4 momentum of 2.7 GeV/c at values of the deuteron spectator momentum q less than or equal to 0.3 GeV/c using the 2 m hydrogen bubble chamber of ITEP. The criteria of pole dominance are analysed. A lower bound is given on the value of the nuclear vertex constant G(alpha dd)(2) = (5.97 +/- 1.09) fm. The experimental data are compared with the theoretical calculations.

The 2m hydrogen bubble chamber was exposed to a separated beam of α-particles from the ITEP synchrotron. The momentum of the 4He-nuclei beam 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 Tp = 220 MeV). The total and topological cross sections were measured as well as the cross section of separate 4He-p interaction channels and the differential cross sections dσdt of the elastic 4He-p scattering. The experimental results have been compared with the data of the previous experiments and with the theoretical predictions based on the Glauber-Sitenko multiple-scattering theory.

A 2-m liquid-hydrogen bubble chamber was exposed to a separated beam of alpha particles from the ITEP synchrotron. The momentum of the incident He-4 nuclei, averaged over the fiducial volume of the chamber, was 2.7 GeV/c (the kinetic energy of the incident protons in the rest frame of the nucleus was T(p) = 220 MeV). The spectral functions for the decays alpha --> tp and alpha --> taun, extracted from the exclusive reactions alphap --> tpp and alphap --> taupn, are identical within the experimental errors. By extrapolating the nuclear vertex function to the pole a lower bound is obtained for the corresponding vertex constant. The experimental data are compared with the results of other studies and with theoretical calculations.

A 2-m hydrogen bubble chamber was exposed to a separated beam of alpha particles from the ITEP synchrotron. The momentum of the incident He-4 beam averaged over the bubble-chamber fiducial volume was 2.7 GeV/c (the kinetic energy of the initial protons in the nuclear rest frame was T(p) = 220 MeV). The total and topological cross sections were measured, as well as the cross section of the separate ap interaction channels and the differential cross sections dsigma/dt of elastic alphap scattering. The experimental results are compared with the data of previous experiments and with theoretical predictions based on the Glauber-Sitenko multiple-scattering theory.

The nuclear vertex function of 3 He → ppn disintegration has been determined from analysis of the reaction 3He p → pppn. The experimental data have been obtained in the 4π geometry by means of the 80 cm ITEP liquid-hydrogen bubble chamber, exposed to 3He separated beams at momenta of 2.5 and 5 GeV/c. The method used for extraction of the nuclear vertex function is well founded. For the first time, the 3He → ppn vertex function has been investigated simultaneously as a function of two Jacobi momenta. The singlet part of the vertex function has been extracted separately. The momentum distributions of protons, neutrons, pp and pn pairs in 3He have been obtained also. These results are compared with the available data and with theoretical calculations performed with the wave functions for the Reid and Yamaguchi potentials.

The mechanism of the reaction 3He + p → p + p + d is studied by making use of the ITEP 80 cm liquid-hydrogen bubble chamber exposed to a beam of 5 GeV/c 3He nuclei. The reaction cross section is equal to 20.6 ± 0.3 mb. The phase-space regions associated with quasifree scattering (QFS) and final-state interactions (FSI) are selected. Angular, mass and momentum distributions of the reaction products are obtained in the entire kinematically allowed range. The experimental data in the QFS region are compared with theoretical calculations based on the simplest pole-diagram approximation. The 3He and deuteron wave functions (WF) correspond to the realistic RSC potential. The D-wave components of these WF are taken into account. The absolute value of the cross section and shape of the distributions are described as a whole reasonably well within the frame of the model considered in the kinematical region where FSI may be neglected. But at large spectator momenta there is an essential disagreement. The possible reasons for this are discussed.