| 1. |
- Adolfsson, Jonatan
(författare)
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Studying particle production in small systems through correlation measurements in ALICE
- 2020
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Ingår i: Acta Physica Polonica B, Proceedings Supplement. - 1899-2358. ; 14:1, s. 21-27
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Tidskriftsartikel (refereegranskat)abstract
- In these proceedings, measurements of angular correlations between hadron pairs in pp collisions obtained by the ALICE experiment at the LHC are presented and compared with phenomenological predictions. Correlations between particles carrying the same and opposite quantum numbers are studied to understand the hadron production mechanism, and the difference between the same-sign and opposite-sign correlations is used to probe charge-dependent effects in particle production. Correlation measurements dominated by minijet fragmentation agree well with the models, but other results, in particular correlations between baryons and strange hadrons, are not yet understood.
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| 2. |
- Albertsson, M.
(författare)
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Energy dependence of fission-fragment neutron multiplicity in 235U(n, f)
- 2019
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Ingår i: Acta Physica Polonica B, Proceedings Supplement. - 1899-2358. ; 12:3, s. 499-506
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Tidskriftsartikel (refereegranskat)abstract
- A consistent framework for treating the energy dependence of fission-fragment neutron multiplicities is presented. The shape evolution of the compound nucleus towards scission is treated in the strong damping limit using the Metropolis walk method. The available excitation energy at scission is then divided statistically between the two fragments using microscopic level densities. Deformation energies, which contribute to the excitation energy when the fragments relax to their ground-state shapes, are also computed. From the total fragment excitation energies, the number of emitted neutrons is obtained and illustrated for neutron-induced fission of 235U.
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| 3. |
- Bartoszek, Krzysztof, 1984-, et al.
(författare)
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Influenza differentiation and evolution
- 2010
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Ingår i: Acta Physica Polonica B Proceedings Supplement. ; 3:2, s. 417-452
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Konferensbidrag (refereegranskat)abstract
- The aim of the study is to do a very wide analysis of HA, NA and M influenza gene segments to find short nucleotide regions,which differentiate between strains (i.e. H1, H2, ... e.t.c.), hosts, geographic regions, time when sequence was found and combination of time and region using a simple methodology. Finding regions differentiating between strains has as its goal the construction of a Luminex microarray which will allow quick and efficient strain recognition. Discovery for the other splitting factors could shed lighton structures significant for host specificity and on the history of influenza evolution. A large number of places in the HA, NA and M gene segments were found that can differentiate between hosts, regions, time and combination of time and region. Also very good differentiation between different Hx strains can be seen.We link one of our findings to a proposed stochastic model of creation of viral phylogenetic trees.
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| 4. |
- Baxevani, Anastassia, et al.
(författare)
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Series Decomposition of fractional Brownian motion and its Lamperti transform
- 2009
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Ingår i: Acta Physica Polonica B, Proceedings Supplement. - 1899-2358. ; 40:5, s. 1395-1435
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Tidskriftsartikel (refereegranskat)abstract
- The Lamperti transformation of a self-similar process is a stationary process. In particular, the fractional Brownian motion transforms to the second order stationary Gaussian process. This process is represented as a series of independent processes. The terms of this series are Ornstein-Uhlenbeck processes if H < 1/2, and linear combinations of two dependent Ornstein-Uhlenbeck processes whose two dimensional structure is Markovian if H > 1/2. From the representation effective approximations of the process are derived. The corresponding results for the fractional Brownian motion are obtained by applying the inverse Lamperti transformation. Implications for simulating the fractional Brownian motion are discussed.
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| 5. |
- Blaschke, David, et al.
(författare)
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Accessibility of color superconducting quark matter phases in heavy-ion collisions
- 2010
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Ingår i: Acta Physica Polonica B Proceedings Supplement. - 1899-2358 .- 2082-7865. ; 3:3, s. 741-745
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Tidskriftsartikel (refereegranskat)abstract
- We discuss a hybrid equation of state (EoS) that fulfills constraints for mass-radius relationships and cooling of compact stars. The quark matter EoS is obtained from a Polyakov-loop Nambu-Jona-Lasinio (PNJL) model with color superconductivity, and the hadronic one from a relativistic mean-field (RMF) model with density-dependent couplings (DD-RMF). For the construction of the phase transition regions we employ here for simplicity a Maxwell construction. We present the phase diagram for symmetric matter which exhibits two remarkable features: (1) a "nose"-like structure of the hadronic-to-quark matter phase border with an increase of the critical density at temperatures below T \sim 150 MeV and (2) a high critical temperature for the border of the two-flavor color superconducting (2SC) phase, Tc >160 MeV. We show the trajectories of heavy-ion collisions in the plane of excitation energy versus baryon density calculated using the UrQMD code and conjecture that for incident energies of 4 . . . 8 A GeV as provided, e.g., by the Nuclotron-M at JINR Dubna or by lowest energies at the future heavy-ion collision experiments CBM at FAIR and NICA at JINR, the color superconducting quark matter phase becomes accessible.
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| 6. |
- Csörgő, T., et al.
(författare)
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Lévy imaging of elastic hadron–hadron scattering : Odderon and inner structure of the proton∗
- 2019
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Ingår i: Acta Physica Polonica B, Proceedings Supplement. - 1899-2358. ; 12:4, s. 779-785
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Tidskriftsartikel (refereegranskat)abstract
- A novel model-independent Lévy imaging method is employed for reconstruction of the elastic pp and pp¯ scattering amplitudes at low and high energies. The four-momentum transfer t-dependent elastic slope B(t), the nuclear phase φ(t) as well as the excitation function of the shadow profile P(b) have been extracted from data at ISR, Tevatron and the LHC energies. We found qualitative differences in properties of B(t) and φ(t) between pp and for pp¯ collisions that indicate an odderon effect. A proton substructure has also been identified and found to have two different sizes, comparable to that of a dressed quark at the ISR and a dressed diquark at the LHC energies, respectively.
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| 7. |
- Csörgő, Tamás, et al.
(författare)
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MODEL-INDEPENDENT ODDERON RESULTS BASED ON TOTEM DATA ON ELASTIC PROTON-PROTON SCATTERING AT 8 TeV
- 2023
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Ingår i: Acta Physica Polonica B, Proceedings Supplement. - 1899-2358. ; 16:5
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Tidskriftsartikel (refereegranskat)abstract
- We complete the model-independent analysis of the scaling properties of the differential cross section of elastic proton-proton cross sections, including new TOTEM data published in 2022 at √s = 8 TeV. We separate the signal and background regions with a new gating method. In the signal region, we find that the statistical significance of the Odderon exchange from the combined 7.0 and 8.0 TeV pp data of TOTEM and the 1.96 TeV pp̄ data of D0 is at least 7.32σ. In the background region, the scaling functions of elastic proton-proton data at 7 and 8 TeV, and that of elastic proton-antiproton scattering data at 1.96 TeV agree with a statistical significance not larger than 1.93σ.
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| 8. |
- Gustafson, Gösta
(författare)
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Small x, Saturation, and Diffraction in Collisions with Electrons, Protons and Nuclei
- 2013
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Ingår i: International Symposium on Multiparticle Dynamics. - 1899-2358. ; 6:2, s. 621-627
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Konferensbidrag (refereegranskat)abstract
- The Lund dipole model DIPSY is based on BFKL evolution and saturation. It can be applied to collisions between electrons, protons, and nuclei. In this paper, I present some recent results for exclusive final states in inelastic collisions, a method to generate final states in diffractive excitation, and some results for collisions with nuclei.
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| 9. |
- Kudaibergenova, E., et al.
(författare)
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MEASUREMENTS OF THE REACTION CROSS SECTIONS OF NEUTRON-RICH Sn ISOTOPES AT THE R3B SETUP
- 2024. - 3
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Ingår i: XXXVII MAZURIAN LAKES CONFERENCE ON PHYSICS : PROBING FUNDAMENTAL PROPERTIES OF MATTER WITH RARE ISOTOPES - PROBING FUNDAMENTAL PROPERTIES OF MATTER WITH RARE ISOTOPES. - 1899-2358. ; 17
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Konferensbidrag (refereegranskat)abstract
- A fundamental framework to describe nuclear matter as a function of pressure and nuclear isospin asymmetry is the nuclear Equation of State (EoS). Constraining the parameters of the EoS is one of the central issues in nuclear physics, especially since the slope parameter L has not yet been constrained well experimentally. It has been identified that a precise determination of the neutron-removal cross section in neutron-rich nuclei, which correlates with the neutron-skin thickness, would provide a more precise constraint on L. To this end, an experiment was performed at the R3B setup in the GSI Helmholtzzentrum für Schwerionenforschung GmbH as a part of the FAIR Phase-0 program. The reactions are studied in inverse kinematics with neutron-rich tin isotopes in the mass range of A = 124–134 on carbon targets of different thicknesses. The reaction products have been measured at beam energies of 400–900 MeV/u in a kinematically complete manner. In this communication, the analysis of124Sn+12C at 900 MeV/u is presented. The charge-exchange reactions, resulting processes, and their role in the calculation of other reaction cross sections are discussed. © 2024 Jagiellonian University. All rights reserved.
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| 10. |
- Lihtar, I., et al.
(författare)
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RELATIVISTIC COULOMB EXCITATION OF 124 Sn
- 2024
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Ingår i: Acta Physica Polonica B, Proceedings Supplement. - 1899-2358. ; 17:3
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Tidskriftsartikel (refereegranskat)abstract
- The Coulomb excitation of 124, 128, 130, 132, 134Sn isotopes in the electric field of a Pb target have been studied using the R3B setup as a part of the FAIR Phase-0 program. The experiment was motivated by the possibility of using the nuclear dipole response to infer valuable information on the slope of the symmetry energy of the nuclear equation of state. Measurements were performed in inverse kinematics at relativistic energies of 750 MeV/u and 904 MeV/u. The analysis method and preliminary results for the decay channel with a single outgoing neutron for 124Sn are reported.
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