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  1. Book ; Online: Classification of Equation of State in Relativistic Heavy-Ion Collisions Using Deep Learning

    Kvasiuk, Yu. / Zabrodin, E. / Bravina, L. / Didur, I. / Frolov, M.

    2020  

    Abstract: Convolutional Neural Nets, which is a powerful method of Deep Learning, is applied to classify equation of state of heavy-ion collision event generated within the UrQMD model. Event-by-event transverse momentum and azimuthal angle distributions of ... ...

    Abstract Convolutional Neural Nets, which is a powerful method of Deep Learning, is applied to classify equation of state of heavy-ion collision event generated within the UrQMD model. Event-by-event transverse momentum and azimuthal angle distributions of protons are used to train a classifier. An overall accuracy of classification of 98\% is reached for Au+Au events at $\sqrt{s_{NN}} = 11$ GeV. Performance of classifiers, trained on events at different colliding energies, is investigated. Obtained results indicate extensive possibilities of application of Deep Learning methods to other problems in physics of heavy-ion collisions.

    Comment: LATEX, 14 pages, 8 figures
    Keywords Nuclear Theory ; Computer Science - Machine Learning ; High Energy Physics - Phenomenology ; Nuclear Experiment
    Publishing date 2020-04-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Effective equation of state of hot and dense matter in nuclear collisions around FAIR energy

    Bravina L. / Zabrodin E.

    EPJ Web of Conferences, Vol 95, p

    2015  Volume 01003

    Abstract: The chemical and thermal equilibration in the central zone of heavy-ion collisions at energies around FAIR is studied within two microscopic models. Two systems are utilized for the analysis: (i) central cubic cell of fixed volume V = 125 fm3 and (ii) ... ...

    Abstract The chemical and thermal equilibration in the central zone of heavy-ion collisions at energies around FAIR is studied within two microscopic models. Two systems are utilized for the analysis: (i) central cubic cell of fixed volume V = 125 fm3 and (ii) expanding central area of uniformly distributed energy density. It is found that kinetic, thermal, and chemical equilibration of the expanding hadronic matter are nearly approached in both systems for the period of 10–18 fm/c. The expansion proceeds almost isentropically. The extracted equation of state (EOS) in P − ɛ plane has a linear dependence P = aɛ, where a ≡ c2s slightly increases with the collision energy from 0.12 to 0.145. Linear dependencies for the EOS are found also in T − μB and T − μS planes. The characteristic kinks observed in the last two phase diagrams are linked to inelastic freeze-out in the expanding fireball.
    Keywords Science ; Q ; Physics ; QC1-999
    Subject code 541
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Effective equation of state of hot and dense matter in nuclear collisions around FAIR energy

    Bravina L. / Zabrodin E.

    EPJ Web of Conferences, Vol 95, p

    2015  Volume 01003

    Abstract: The chemical and thermal equilibration in the central zone of heavy-ion collisions at energies around FAIR is studied within two microscopic models. Two systems are utilized for the analysis: (i) central cubic cell of fixed volume V = 125 fm3 and (ii) ... ...

    Abstract The chemical and thermal equilibration in the central zone of heavy-ion collisions at energies around FAIR is studied within two microscopic models. Two systems are utilized for the analysis: (i) central cubic cell of fixed volume V = 125 fm3 and (ii) expanding central area of uniformly distributed energy density. It is found that kinetic, thermal, and chemical equilibration of the expanding hadronic matter are nearly approached in both systems for the period of 10–18 fm/c. The expansion proceeds almost isentropically. The extracted equation of state (EOS) in P − ɛ plane has a linear dependence P = aɛ, where a ≡ c2s slightly increases with the collision energy from 0.12 to 0.145. Linear dependencies for the EOS are found also in T − μB and T − μS planes. The characteristic kinks observed in the last two phase diagrams are linked to inelastic freeze-out in the expanding fireball.
    Keywords Science ; Q ; Physics ; QC1-999
    Subject code 541
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Crater formation and deuterium production in laser irradiation of polymers with implanted nano-antennas.

    Csernai, László P / Mishustin, Igor N / Satarov, Leonid M / Stöcker, Horst / Bravina, Larissa / Csete, Mária / Kámán, Judit / Kumari, Archana / Motornenko, Anton / Papp, István / Rácz, Péter / Strottman, Daniel D / Szenes, András / Szokol, Ágnes / Vass, Dávid / Veres, Miklós / Biró, Tamás S / Kroó, Norbert

    Physical review. E

    2023  Volume 108, Issue 2-2, Page(s) 25205

    Abstract: Recent validation experiments on laser irradiation of polymer foils with and without implanted golden nanoparticles are discussed. First we analyze characteristics of craters, formed in the target after its interaction with the laser beam. Preliminary ... ...

    Abstract Recent validation experiments on laser irradiation of polymer foils with and without implanted golden nanoparticles are discussed. First we analyze characteristics of craters, formed in the target after its interaction with the laser beam. Preliminary experimental results show significant production of deuterons when both the energy of laser pulse and concentration of nanoparticles are high enough. We consider the deuteron production via the nuclear transmutation reactions p+C→d+X where protons are accelerated by the Coulomb field generated in the target plasma. We argue that maximal proton energy can be above threshold values for these reactions and the deuteron yield may noticeably increase due to presence of nanoparticles.
    Language English
    Publishing date 2023-09-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.108.025205
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Anisotropic flow in HYDJET++

    Zabrodin E. / Bravina L. / Brusheim Johansson B.H. / Eyyubova G.

    EPJ Web of Conferences, Vol 70, p

    interplay between soft and hard physics

    2014  Volume 00010

    Abstract: The development of elliptic, υ2 and quadrangular, υ4, flow in the ψ2 plane is studied within the HYDrodynamics with JETs (HYDJET++) model in ultrarelativistic heavy-ion collisions at energies of RHIC and LHC. Despite the general expectations, jet ... ...

    Abstract The development of elliptic, υ2 and quadrangular, υ4, flow in the ψ2 plane is studied within the HYDrodynamics with JETs (HYDJET++) model in ultrarelativistic heavy-ion collisions at energies of RHIC and LHC. Despite the general expectations, jet influence on the ratio of flow harmonics is shown to be significant already at intermediate transverse momenta. Hard processes lead to increase of the υ4/υ22 ratio and violation of the number-of-constituent-quark (NCQ) scaling at LHC.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-04-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Induced Surface and Curvature Tensions Equation of State of Hadrons with Relativistic Excluded Volumes and its Relation to Morphological Thermodynamics

    Bugaev, K. A. / Yakovenko, N. S. / Oliinyk, P. V. / Nikonov, E. G. / Blaschke, D. B. / Bravina, L. V. / Zabrodin, E. E.

    2021  

    Abstract: An analytical formula that accurately accounts for the Lorentz contraction of the excluded volume of two relativistic hadrons with hard-core repulsion is worked out. Using the obtained expression we heuristically derive the equation of state of Boltzmann ...

    Abstract An analytical formula that accurately accounts for the Lorentz contraction of the excluded volume of two relativistic hadrons with hard-core repulsion is worked out. Using the obtained expression we heuristically derive the equation of state of Boltzmann particles with relativistic excluded volumes in terms of system pressure and its surface and curvature tension coefficients. The behavior of effective excluded volumes of lightest baryons and mesons is studied at very high temperatures (particle number densities) and for very large values of degeneracy factors. Several parameterizations of the obtained equation of state demonstrate a universal asymptotics of the effective excluded volume at high particle number densities. It is peculiar, that the found maximal packing fraction $\eta \simeq 0.75$ of Lorentz contracted particles is very close to the dense packing limit of classical hard spheres of same radius $\eta_{exc} \approx 0.74$. We show that the developed equation of state is the grand canonical formulation of the morphological thermodynamics approach applied to Lorentz contracted rigid spheres.

    Comment: 15 pages, 3 figures
    Keywords Nuclear Theory ; High Energy Physics - Phenomenology
    Subject code 539 ; 612
    Publishing date 2021-04-13
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Influence of resonance decays on triangular flow in heavy-ion collisions

    Crkovská J. / Bravina L. V. / Eyyubova G. Kh. / Zabrodin E. E.

    EPJ Web of Conferences, Vol 95, p

    2015  Volume 04014

    Abstract: Anisotropic flow in relativistic collisions of heavy-ions yields important information about the state of the hot and dense matter created in the collision. Study of triangular flow in Pb+Pb collisions at LHC was performed using HYDJET++ Monte Carlo ... ...

    Abstract Anisotropic flow in relativistic collisions of heavy-ions yields important information about the state of the hot and dense matter created in the collision. Study of triangular flow in Pb+Pb collisions at LHC was performed using HYDJET++ Monte Carlo generator. HYDJET++ combines both hydrodynamics-driven soft part together with hard jet-part, giving a realistic prediction for vast number of hadron species. The model also enables study of influence of final-state interactions on flow of created hadrons. Triangular flow patterns of pions, kaons and protons were studied. We found that resonance decays influence significantly the shape of the distributions.
    Keywords Science ; Q ; Physics ; QC1-999
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Article ; Online: Influence of resonance decays on triangular flow in heavy-ion collisions

    Crkovská J. / Bravina L. V. / Eyyubova G. Kh. / Zabrodin E. E.

    EPJ Web of Conferences, Vol 95, p

    2015  Volume 04014

    Abstract: Anisotropic flow in relativistic collisions of heavy-ions yields important information about the state of the hot and dense matter created in the collision. Study of triangular flow in Pb+Pb collisions at LHC was performed using HYDJET++ Monte Carlo ... ...

    Abstract Anisotropic flow in relativistic collisions of heavy-ions yields important information about the state of the hot and dense matter created in the collision. Study of triangular flow in Pb+Pb collisions at LHC was performed using HYDJET++ Monte Carlo generator. HYDJET++ combines both hydrodynamics-driven soft part together with hard jet-part, giving a realistic prediction for vast number of hadron species. The model also enables study of influence of final-state interactions on flow of created hadrons. Triangular flow patterns of pions, kaons and protons were studied. We found that resonance decays influence significantly the shape of the distributions.
    Keywords Science ; Q ; Physics ; QC1-999
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  9. Article ; Online: Proton-proton collisions at ultra-relativistic energies in quark-gluon string model

    Bravina L. / Bleibel J. / Malinina L. / Nilsson M.S. / Zabrodin E.

    EPJ Web of Conferences, Vol 70, p

    2014  Volume 00015

    Abstract: The microscopic Monte Carlo quark-gluon string model (QGSM) is employed to study particle production in ultrarelativistic proton-proton collisions. The model is based on Reggeon Field theory accomplished by string phenomenology. Various observables, ... ...

    Abstract The microscopic Monte Carlo quark-gluon string model (QGSM) is employed to study particle production in ultrarelativistic proton-proton collisions. The model is based on Reggeon Field theory accomplished by string phenomenology. Various observables, including multiplicity, rapidity and transverse momentum spectra, short-range, long-range and femtoscopy correlations, are described quite well in a wide span of the collision energy. Predictions are made for pp collisions at √s = 14 TeV.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-04-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Ultra-relativistic heavy-ion collisions - a hot cocktail of hydrodynamics, resonances and jets

    Zabrodin E. / Bravina L. / Brusheim Johansson B.H. / Crkovska J. / Eyyubova G.Kh. / Korotkikh V.L. / Lokhtin I.P. / Malinina L.V. / Petrushanko S.V. / Snigirev A.M.

    EPJ Web of Conferences, Vol 95, p

    2015  Volume 03039

    Abstract: Ultra-relativistic heavy-ion collisions at energies of RHIC and LHC are considered. For comparison with data the HYDJET++ model, which contains the treatment of both soft and hard processes, is employed. The study focuses mainly on the interplay of ideal ...

    Abstract Ultra-relativistic heavy-ion collisions at energies of RHIC and LHC are considered. For comparison with data the HYDJET++ model, which contains the treatment of both soft and hard processes, is employed. The study focuses mainly on the interplay of ideal hydrodynamics, final state interactions and jets, and its influence on the development of harmonics of the anisotropic flow. It is shown that jets are responsible for violation of the number-of-constituent-quark (NCQ) scaling at LHC energies. The interplay between elliptic and triangular flows and their contribution to higher flow harmonics and dihadron angular correlations, including ridge, is also discussed.
    Keywords Science ; Q ; Physics ; QC1-999
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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