Average multiplicity of protons fromp, d, α andC interactions with carbon at 4.2 GeV/c/ N is shown to increase with the mass number of incident nucleus. ThisA dependence is stronger for fast protons than for the slow ones. Angular and momentum distributions are described by the Dubna Cascade Model. Some discrepancy is observed in the high momentum part of the distributions.

Topological cross sections and characteristics of charged particle multiplicity distributions for¯nn andnn interactions and¯nn annihilations at 6·1 GeV/c are presented. KNO-distributions for¯nn andnn interactions are very similar. Characteristics for¯nn and¯pp annihilations are identical at equal energies.

We have investigated ..lambda..-hyperon and K/sup 0//sub S/ -meson production in Cp, CC and multinucleon interactions. The average multiplicities and also the inclusive cross sections of ..lambda.. and K/sup 0//sub S/ production in the types of interactions studied have been determined. A larger charged particle multiplicity is observed on the average in CC interactions with ..lambda..- and K/sup 0//sub S/ -particle production as compared with all inelastic CC interactions: /sup LambdatsK//sup 0//sub CC/roughly-equal1.3/sup i/n/sub CC/. Such an effect is not observed for multi-nucleon CC interactions. The distributions of ..lambda.. and K/sup 0//sub S/ particles in p/sub lab/, y/sub lab/, cos theta(/sub N/N, and p/sub perpendicular/ are presented.

We have investigated experimentally two-particle correlations of protons emitted with nearly equal momenta from ..cap alpha..+/sup 12/C..-->..kp+X(k = 2, 3, ...) collisions at primary momentum per nucleon p/sub ..cap alpha..//A = 4.2 GeV/c. In order to estimate the dimensions of the proton-emission region we have compared the correlations with the theoretical functions describing two-proton correlations. The magnitude of the radius of the emission region decreases with increase of the momenta as well as of the transverse momenta of the emitted protons. We have found that for fast protons (pgreater than or equal to0.3 GeV/c) the radius of the emission region is comparable with the radius of the /sup 12/C nucleus, and for slow protons (p<0.3 GeV/c) it is significantly larger.

Light ion collisions with carbon target at 4.2 GeV/c/N are studied. Pion multiplicity distributions, momentum and angular spectra are analysed. These data are described in terms of models assuming independent interactions of nucleons from the projectile nucleus with the target.

The dependence on the cumulative variable is investigated for the invariant differential cross sections for production of ..pi../sup -/ mesons in collisions of deuterium and carbon nuclei with carbon and tantalum nuclei at primary momentum 4.2 GeV/c per nucleon. It is shown that the ratio of these cross sections, taken per nucleon, for various target nuclei is described by the quark-parton model of the nucleus proposed by A. M. Baldin.

We present experimental material obtained by processing photographs of the 2-meter propane bubble chamber bombarded by carbon nuclei with momentum 4.2 GeV/c per nucleon. It is established that the cross sections for interaction of secondary multiply charged fragments with charges Z/sub f/> or =3 at a distance greater than 10 cm from the primary star are systematically higher than the expected cross sections for interaction of the corresponding nuclei in the ground state. Fragments with charges Z/sub f/ = 5 and 6 have interaction cross sections 10% higher than the expected value. The experimental data on the characteristics of the ..gamma.. rays accompanying the production of fragments with charges Z/sub f/ = 5 and 6 are consistent with the statement that, in addition to ..gamma.. rays from decay of ..pi../sup 0/ mesons, low-energy ..gamma.. rays with an isotropic angular distribution in the rest system of the fragment are present. The contribution of ..gamma.. rays from hadronic bremsstrahlung is observed.

Experimental data on interactions of relativistic p, d, He and C nuclei with carbon and tantalum nuclei are presented. The data come from the 2−m propane bubble chamber with an internal tantalum target. It is found that interaction cross sections for carbon projectile fragments with chargesZ=5,6 are 10% greater than expected. In central C+C collisions and in multinucleon interactions of d, He and C with tantalum a contribution is observed from cumulative interactions irreducible to the superposition of NN-collisions taking into account final state interactions, rescattering effects, etc.