[en] An analysis of multiple production induced by 2.1 GeV/n ¹⁴N ions in nuclear emulsions is presented. Multiplicity and angular distributions of charged secondaries and correlations among them are discussed. The presented data are compared with relevant values from proton-nucleus interactions. The possible appearance of collective phenomena in nucleus-nucleus interactions is discussed. (Auth.)

[en] The azimuthal correlations between various types of secondary particles from proton-nucleus interactions have been studied at the nominal energies of the relativistic-nucleus accelerators at Dubna and Berkeley. A comparative analysis is made of these correlations in proton-nucleus and nucleus-nucleus collisions at identical energies per projectile nucleon. The results are discussed at a qualitative level on the basis of certain theoretical approaches to collisions with nuclei

[en] Emission of projectile and target fragments in inelastic interactions of ⁸⁴Kr nuclei with Ag (Br) at 0.95 GeV per nucleon is investigated with the aim of detecting collective flow. A transverse-momentum analysis is performed in the reaction plane. The bounce-off of projectile fragments is observed. This effect is found to become stronger with decreasing impact parameter

[en] Various flow phenomena observed by a unique emulsion method are reviewed. The experimental data of the emission of projectile and target fragments and relativistic particles in collisions of 1-160 A GeV/c ¹⁶O, ²²Ne, ²⁸Si, ³²S, ⁸⁴Kr, ¹⁹⁷Au, and ²⁰⁸Pb nuclei with ¹⁰⁸Ag (⁸⁰Br) targets are investigated. The transverse-momentum approach, the flow-angle analysis using principal vectors, the azimuthal correlation functions, the method of azimuthal correlations between charged secondaries, and the method of Fourier expansion of the azimuthal angle distributions are applied. Evidence of the directed flow of spectators has been obtained in the medium-impact nuclear interactions. In azimuthal distributions, with respect to the reaction plane, the signal of the elliptic flow of participants has been observed

[en] Full text: A study of nucleus-nuclei interactions at relativistic and ultra-relativistic energies is an actual problem on many causes, and specifically, there is an unique opportunity to study properties of nuclear matter at high densities and temperatures, to reveal some features of processes of multiparticle production and of multifragmentation of colliding nuclei as well as to carry out a search of a manifestation of quark-gluon plasma. The larger mass and energy of colliding nuclei the larger favourable conditions for decision of those problems. In our paper there are presented results of the study of the interaction of Au¹⁹⁷ (10.7 GeV/nucleon the accelerator of BNL, USA) and Pb²⁰⁸ (158 GeV/nucleon, supercollider, CERN Geneva) with nuclei of atoms, including into a composition of thick-layer photo-emulsion. There is carried out the comparative analysis of obtained experimental data (characteristics of all secondary charged particles and fragments of colliding nuclei) with the purpose to compare experiments, in which initial nuclei are ones having similar masses and considerably distinguishing on energy. And what's more there are analysed central (there are observed fragments of nucleus - projectile with charges z_f≤2 only) and peripheral (a presence of multicharged fragments, z_f≥3) interactions. Besides, results of each experiment are compared with characteristics of events performed within the framework of the Cascade - Evaporative Model

[en] Angular distributions of charged particles produced in ¹⁶O and ³²S collisions with nuclear track emulsion were studied at momenta 4.5 and 200 A GeV/c. Comparison with the angular distributions of charged particles produced in proton-nucleus collisions at the same momentum allows to draw the conclusion, that the angular distributions in nucleus-nucleus collisions can be seen as superposition of the angular distributions in nucleon-nucleus collisions taken at the same impact parameter b_NA, that is mean impact parameter between the participating projectile nucleons and the center of the target nucleus

[en] Pseudorapidity density distributions of charged particles in heavy-ion collisions have been studied. The results from EMU01 have been compared to the results from the experiments WA80 and E802. The recently obtained pseudorapidity distributions from Au+Au and Au+Ag interactions have been compared to a linear extrapolation from lighter systems. (orig.)

[en] We use scaled factorial cumulant moments to analyze pseudorapidity fluctuations in nucleus-nucleus collisions. This approach is similar to the method of scaled factorial moments except that it removes the effects of lower-order correlations upon a given moment. Significant second-order cumulants and cumulant indices (slopes with respect to bin size) are found for all of the interactions studied. These indices are found to have an inverse dependence upon average pseudorapidity particle density

[en] The fragmentation topology of ²⁸Si at 3.7A GeV and 14.6A GeV and ³²S at 200A GeV in reactions with emulsion nuclei is presented. The fragmentation cross sections are very similar at all three energies. A statistical percolation model can qualitatively describe the data for Z ≥ 6. The He production is underestimated and the 3 ≤ Z ≤ 5 fragments overestimated by this model. (orig.)