121847480
Multiplicity of charged particles in π−-carbon interactions from 4 to 40 GeV/c
Abstract We have measured the multiplicities of secondary charged particles produced in the collisions of π − mesons with carbon nuclei at momenta of 4.0, 5.0, 7.5 and 40.0 GeV/ c . The distribution of the number of visible protons does not change with the primary energy. There is observed an anomaly around n S = 3–4 for the multiplicity distribution of shower particles at 40 GeV/ c . Both the average multiplicities of shower and negative particles increase logarithmically with the momentum of the primary π − meson. The multiplicity of secondaries obeys KNO scaling. There are correlations, increasing with energy, between average multiplicities of charged fast particles and the number of slow protons. The presented experimental data are analyzed in the framework of new models proposed for inelastic hadron-nucleus collisions.
103063465
Resonance Production in pi- p Interactions at 40-GeV/c
120410828
Production of cumulative protons in high-energy hadron-nucleus and nucleus-nucleus interactions
Under conditions of 4π coverage, the production of cumulative protons in π−C, pC, 4HeC, and CC collisions at high energies is studied on the basis of a large statistical sample. The behavior of inclusive cross sections for cumulative-proton production versus the cumulative number β is found to be universal in the sense that it is independent of the type projectile and primary energy. It is established that the mean number of cumulative protons is also independent of the projectile type and primary energy.
126039394
Study of the Coherent Interactions of pi- Mesons with the Carbon Nuclei at 40-GeV/c
118116705
Studying the breakup of relativistic O-16 nuclei into multiply charged fragments
120616762
On the mechanisms of cumulative-proton production in high-energy hadron-nucleus and nucleus-nucleus collisions
The importance of studying processes involving cumulative-proton production stems from their direct relation to the formation of multiquark configurations, so-called fluctons, in a nucleus owing to nucleondensity fluctuations in which two or more nucleons occur at a distance shorter than 1 fm from one another. According to [1], multiquark configurations may arise in two different physics patterns. The first, caused by a fluctuation of the target-nucleus density, is referred to as a cold model, while the second, associated with nuclear-matter compression occurring under the effect of an incident hadron or a projectile nucleus and leading to the formation of dense quark bags, is called a hot model. It should be noted that, in early interpretations, the production of cumulative protons was related to the Fermi momenta of nucleons. However, the calculations that took into account the Fermi momentum of nucleons [2] showed that the spectrum of fast ( p> 500 MeV/c) cumulative protons cannot be described in this way. In the present study, we examine new features of the process of cumulative-proton production—in particular, we analyze the behavior of the mean multiplicity of cumulative protons as a function of the charge and mass numbers of the target nucleus. Previously, our group studied [3–5] cumulativeproton production in π −12 С, pС, 4 НеС, СС, 16 Op, and p 20 Ne collisions at primary energies in the range 3–300 GeV and, on the basis of a vast statistical data sample, confirmed the universal regularity that the slope parameter of inclusive cross sections for cumulative protons in the cumulative number β is independent of the primary energy and mass of the incident particle or nucleus. It was shown that the fraction of events involving cumulative-proton production on a carbon nucleus is sensitive to the
195343399
Experimental investigation of charge-exchange processes involving a target proton in 16Op collisions at a momentum of 3.25 GeV/c per nucleon
For the first time, charge-exchange processes involving a target proton in 16Op collisions at a momentum of 3.25 GeV/c per nucleon are studied under conditions of 4π geometry. New data on the mean multiplicities fragments and pions, as well as on inelastic cross sections for topological channels of the fragmentation of an oxygen nucleus in charge-exchange reactions involving a target proton that either are accompanied or are not accompanied by charge transfer to a projectile nucleus, are presented. It is shown that, in 16Op interactions at high energies, charge transfer from a target proton to a projectile nucleus proceeds predominantly via inelastic proton scattering on a neutron of the oxygen nucleus.
122528562
Production of baryon resonances in collisions of 4He nuclei with carbon nuclei at a momentum of 4.2 GeV/c per nucleon
Under conditions of 4π geometry, Δ0-and Δ++-resonance production in collisions of 4He nuclei with carbon nuclei at a momentum of 4.2 GeV/c per nucleon was investigated for the first time. The resonance masses and widths are estimated by analyzing the experimental and background invariant-mass distributions of (pπ±) pairs. Contributions to pion production from Δ-resonance decays, as well as from direct pion production, are determined. The results are compared with corresponding data obtained for CC collisions at the same primary momentum of 4.2 GeV/c per nucleon. By and large, the results obtained here comply with the existence of a collective mechanism of delta-isobar excitation in nuclei.