41 research outputs found
Hadron modification in a dense baryonic matter
Starting with the Strongly Correlated Quark Model of a hadron structure,
SCQM, we demonstrate how the properties of mesons and baryons are modified in a
hot and dense nuclear environment. These in-medium modifications can lead to
the observable effects in heavy ion collisions, such as enhancement of
strangeness and dropping vector meson masses.Comment: 7 pages, 4 figures. Presented at Baldin ISHEPP XXIV, September 17-22,
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Total Cross Section, Inelasticity and Multiplicity Distributions in Proton -- Proton Collisions
Multiparticle production in high energy proton -- proton collisions has been
analysed in the frame of Strongly Correlated Quark Model (SCQM) of the hadron
structure elaborated by the author. It is shown that inelasticity decreases at
high energies and this effect together with the total cross section growth and
the increasing with collision energy the masses of intermediate clusters result
in the violation of KNO -- scaling.Comment: 21 pages, 11 figures, submitted to Yad. Fisik
Search for a signal on intermediate baryon systems formation in hadron-nuclear and nuclear-nuclear interactions at high energies
We have analyzed the behavior of different characteristics of hadron-nuclear
and nuclear-nuclear interactions as a function of centrality to get a signal on
the formation of intermediate baryon systems. We observed that the data
demonstrate the regime change and saturation. The angular distributions of slow
particles exhibit some structure in the above mentioned reactions at low
energy. We believe that the structure could be connected with the formation and
decay of the percolation cluster. With increasing the mass of colliding nuclei,
the structure starts to become weak and almost disappears ultimately. This
shows that the number of secondary internuclear interactions increases with
increasing the mass of the colliding nuclei. The latter could be a reason of
the disintegration of any intermediate formations as well as clusters, which
decrease their influence on the angular distribution of the emitted particles.Comment: 2 pages and one figur
Fragmentation of Nuclei at Intermediate and High Energies in Modified Cascade Model
The process of nuclear multifragmentation has been implemented, together with
evaporation and fission channels of the disintegration of excited remnants in
nucleus-nucleus collisions using percolation theory and the intranuclear
cascade model. Colliding nuclei are treated as face--centered--cubic lattices
with nucleons occupying the nodes of the lattice. The site--bond percolation
model is used. The code can be applied for calculation of the fragmentation of
nuclei in spallation and multifragmentation reactions.Comment: 19 pages, 10 figure
A CLUSTERING APPROACH IN THE UrQMD TRANSPORT MODEL FOR NUCLEAR COLLISIONS AT RELATIVISTIC ENERGIES
A method for cluster recognition from nucleon distributions generated in calculations of relativistic collisions of light particles (protons, α-particles) with nuclei in the framework of the UrQMD model is proposed. The excitation energy of the clusters which is necessary to take into account for the de-excitation of the calculated fragments was estimated from empirical considerations. The approach was applied to calculate mass distributions of fragments in p + Fe collisions for different proton energies and showed a good correspondence to experimental results. The software implementation of the clustering method and a visualization of cluster formation substantially facilitate applications of the proposed method