121761444
Production of $ \Delta$(1232) -resonances on oxygen nuclei in 16O + p collisions at a momentum of 3.25 GeV/c per nucleon
The production of $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ resonances on oxygen nuclei in 16O + p interactions at 3.25A GeV/c was investigated with 4$ \pi$ acceptance. The masses and widths of the resonances were obtained from an analysis of the experimental and background invariant-mass distributions of p$ \pi^{{\pm}}_{}$ pairs. The fractions of charged pions coming from $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ decay were estimated. The momentum, kinetic energy, and emission angle distributions of $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ resonances were reconstructed in the oxygen nucleus rest frame. The slope parameters, T0 , of the reconstructed spectra of invariant cross-sections of $ \Delta^{{++}}_{}$ and $ \Delta^{0}_{}$ resonances, produced on oxygen nuclei in 16O + p interactions at 3.25A GeV/c , were determined.
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.
123557824
Production of baryon resonances in + C interactions at 40 GeV/c
In conditions of 4{pi}-geometry, the production of {delta}{sup ++} and {delta}{sup 0} resonances in {pi}{sup -}+ {sup 12}C interactions at 40 GeV/c was investigated for the first time. The masses and widths of resonances were obtained from an analysis of the experimental and background invariant mass distributions of p{pi}{sup {+-}} pairs. The fractions of charged pions coming from {delta}{sup ++} and {delta}{sup 0} decay as well as the inclusive cross-section of {delta}{sup ++} and {delta}{sup 0} production were determined. The results obtained were compared to the recent results on {delta}(1232) production in {sup 4}He +C and C+C collisions at 4.2 GeV/c per nucleon, and Ni+Ni and Au+Au collisions at energies between 1 and 2A GeV.
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
119859530
Production of multibaryon clusters in hadron-nucleus collisions at high energies
The results obtained by analyzing the production of multibaryon clusters in π−C and p20Ne interactions at momenta of 40 and 300 GeV/c, respectively, are presented.
120774373
Production of cumulative deuterons in collisions of oxygen nuclei with protons at a momentum of 3.25 GeV/c per nucleon
The production of cumulative nuclei of 2H in 16Op collisions at a momentum of 3.25 GeV/c per nucleon was studied for the first time under conditions of a 4π acceptance. The parameter T0 characterizing the slope of the spectrum of invariant cross sections for cumulative-deuteron production in 16Op interactions was determined. The contribution to cumulative-deuteron production from the decay of the alpha-particle clusters in nuclei upon slow-pion absorption by these clusters was found on the basis of an analysis of the momentum distribution of these cumulative nuclei. The estimates obtained for the contribution of these processes from a comparison of the mean multiplicities of particles and fragments in cumulative and noncumulative events agree well with the respective result extracted from the momentum distribution of cumulative deuterons.
126039394
Study of the Coherent Interactions of pi- Mesons with the Carbon Nuclei at 40-GeV/c
123580047
Investigation of Interactions of pi- Mesons with Carbon Nuclei at 40-GeV/c