120628004
Some special features of the momentum spectrum of protons produced in 16Op collisions at a momentum of 3.25 GeV/c per nucleon
The momentum features of protons originating from 16Op collisions at a momentum of 3.25 GeV/c per nucleon are analyzed. It is shown that the degree of excitation of the fragmenting nucleus affects predominantly the shape of the momentum spectrum of protons emitted into the backward hemisphere in the rest frame of the projectile nucleus and partly the shape of the spectra of protons emitted into the forward hemisphere and formed via the mechanisms of Fermi breakup and evaporation.
118116705
Studying the breakup of relativistic O-16 nuclei into multiply charged fragments
122883220
Cross sections for the production of stable and unstable isotopes with charge numbers from one to eight in 16Op collisions at 3.25 A GeV/c
New experimental data are presented for the inclusive cross sections both for the production and for the yield of stable and unstable isotopes with charge numbers from one to eight in 16Op collisions at 3.25 A GeV/c.
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
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
123656934
Cumulative production of three-nucleon nuclei in 16Op collisions at a momentum of 3.25 GeV/c per nucleon
The production of cumulative three-nucleon nuclei (3H and 3He) in 16Op collisions at a momentum of 3.25 GeV/c per nucleon were studied for the first time under conditions of 4π geometry. The slope parameter of the cross section for the production of cumulative three-nucleon nuclei was determined, and new data on correlations of the yields of A = 3 cumulative nuclei, charged particles, and fragments in 16Op interactions are reported. The properties of cumulative and noncumulative events were found to be substantially different, and evidence for the presence of a common universal feature in the mechanisms for the cumulative production of hadrons and light nuclear fragments was obtained.
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.