K. Piasecki
A5047058944- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Medical and Biological Sciences
- Stochastic processes and statistical mechanics
- Craniofacial Disorders and Treatments
- Radiation Detection and Scintillator Technologies
- Peripheral Nerve Disorders
- Advanced Chemical Physics Studies
- Systemic Sclerosis and Related Diseases
- High-Velocity Impact and Material Behavior
- Statistical Methods and Bayesian Inference
- Forensic Anthropology and Bioarchaeology Studies
- Astronomical and nuclear sciences
- Electron and X-Ray Spectroscopy Techniques
- stochastic dynamics and bifurcation
- Electric Power Systems and Control
- Statistical Distribution Estimation and Applications
- Cybersecurity and Information Systems
University of Warsaw
2016-2025
GSI Helmholtz Centre for Heavy Ion Research
2011-2022
Technical University of Darmstadt
2022
Joint Institute for Nuclear Research
2013-2021
Institute of Experimental Physics of the Slovak Academy of Sciences
2021
Slovak Academy of Sciences
2019
Institute of Physics of the Slovak Academy of Sciences
2019
Rudjer Boskovic Institute
2018
Goethe University Frankfurt
2013-2014
Frankfurt Institute for Advanced Studies
2014
We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With help extensive detector simulations done IQMD transport model events including nuclear clusters, various nuisance effects influencing observed cumulants have been investigated. Acceptance and efficiency corrections applied as a function fine grained rapidity transverse momentum bins, well considering local track...
Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function centrality, transverse momentum rapidity in Au+Au collisions $\sqrt{s_{NN}} 2.4$ GeV. Combining information from flow all allows to construct first time, collision energies few GeV, multi-differential picture angular emission pattern these particles. It reflects complicated interplay between effect central fireball...
The global polarization of {\Lambda} hyperons along the total orbital angular momentum a relativistic heavy-ion collision is presented based on high statistics data samples collected in Au+Au collisions at \sqrt{s_{NN}} = 2.4 GeV and Ag+Ag 2.55 with High-Acceptance Di-Electron Spectrometer (HADES) GSI, Darmstadt. This first measurement below strangeness production threshold nucleon-nucleon collisions. Results are reported as function centrality well hyperon transverse (p_T) rapidity (y_{CM})...
Abstract High-precision measurements of flow coefficients $$v_{n}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>v</mml:mi> <mml:mi>n</mml:mi> </mml:msub> </mml:math> ( $$n = 1 - 4$$ <mml:mrow> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> <mml:mo>-</mml:mo> <mml:mn>4</mml:mn> </mml:mrow> ) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at $$\sqrt{s_{_{{\text {NN}}}}}= 2.4$$ <mml:msqrt>...
The K0 meson production by π− mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at Schwer-Ionen-Synchrotron accelerator GSI. Inclusive cross sections distributions are compared to scaled elementary predictions theoretical models describing in-medium kaons. data represent a new reference for those models, which widely used interpretation strangeness in heavy-ion collisions. presented results demonstrate sensitivity kaon reaction...
Heavy-ion collisions often produce fusion barrier distributions with structures displaying a fingerprint of couplings to highly collective excitations. Similar can be obtained from large-angle quasielastic scattering, although in this case, the role many weak direct-reaction channels is unclear. For $^{20}\mathrm{Ne}+^{90}\mathrm{Zr}$, we have observed expected for deformed neon projectile; however, $^{20}\mathrm{Ne}+^{92}\mathrm{Zr}$, find significant extra absorption into large number...
Azimuthal emission patterns of $K^\pm$ mesons have been measured in Ni + collisions with the FOPI spectrometer at a beam kinetic energy 1.91 A GeV. The transverse momentum $p_{T}$ integrated directed and elliptic flow $K^{+}$ $K^{-}$ as well centrality dependence - differential are compared to predictions HSD IQMD transport models. data exhibits different propagation compressed heated nuclear medium favor existence kaon-nucleon in-medium potential, repulsive for attractive mesons.
A feasibility study has been performed in order to investigate the performance of HADES detector measure electromagnetic decays hyperon resonances $\Sigma(1385)^0$, $\Lambda(1405)$ and $\Lambda{\Lambda}(1520)$ as well production double strange baryon systems $\Xi^-$ $\Lambda\Lambda$ p+p reactions at a beam kinetic energy 4.5 GeV. The existing will be upgraded by new Forward Detector, which extends acceptance into range polar angles that plays crucial role for these investigations. analysis...
First measurement of subthreshold \ensuremath{\Sigma}(1385) production is presented. Experimental data are presented for Al+Al reactions at $1.9A$ GeV measured with the FOPI detector SIS/GSI. The $\ensuremath{\Sigma}(1385)/\ensuremath{\Lambda}$ ratio found to be in good agreement transport and statistical model predictions. results allow a better understanding strangeness exchange reaction which dominant process ${K}^{\ensuremath{-}}$ below close-to threshold.
We present simultaneously measured barrier distributions for the ${}^{20}$Ne $+$ ${}^{208}$Pb system derived from large-angle quasielastic scattering and fusion, in latter case by means of detection fission fragments. Both turned out to be smooth, spectacular disagreement with results standard coupled-channels calculations. Namely, they do not posses strong structure expected calculations, even if apparently take into account explicitly all relevant couplings. This points importance weak...
We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ 1.23 A GeV) in four centrality classes the range 0 - 40$\%$ of most central collisions. The are analyzed as a function transverse momentum, mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. angular distributions found be non-isotropic even for event class. Our results fit well...
High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4$ GeV, measured with HADES SIS18/GSI. The experimental correlation functions allow the determination of space-time extent corresponding emission sources via a comparison to models. source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal angle respect reaction plane, collision centrality beam...
$\phi$ and K$^-$ mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by FOPI spectrometer, with a trigger selecting central semi-central events amounting to 51% total cross section. The phase space distributions, yield K$^-$, as well kinetic distribution are presented. $\phi$\K$^-$ ratio is found be $0.44 \pm 0.07(\text{stat}) ^{+0.18}_{-0.12} (\text{syst})$, meaning that about 22% originate decays mesons, occurring mostly in vacuum. inverse slopes direct kaons up...
We present the first determination of energy-dependent amplitudes N⁎ resonances extracted from their decay in KΛ pairs p+p→pK+Λ reactions. A combined Partial Wave Analysis seven data samples with exclusively reconstructed events measured by COSY-TOF, DISTO, FOPI and HADES Collaborations fixed target experiments at kinetic energies between 2.14 to 3.5 GeV is used determine amplitude resonant non-resonant contributions into associated strangeness final state. The contribution masses 1650...
Using the Warsaw cyclotron beam we have determined barrier distributions from quasielastic scattering of ${}^{16}\mathrm{O}$ on ${}^{116,119}\mathrm{Sn}$ targets. They turned out to be similar in both systems. To improve signal/noise ratio, digital filters were applied data analysis procedure and are discussed detail. Experimental results compared with coupled-channels calculations performed using FRESCO code. Reasonable agreement between experiment theory was obtained but some disagreements remain.
We investigate identical pion HBT intensity interferometry in central Au + collisions at 1.23A GeV. High-statistics π−π− and π+π+ data are measured with HADES SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta longitudinally comoving system parametrized as three-dimensional Gaussian distribution, studied of transverse momentum. A substantial charge-sign difference source radii is found, particularly pronounced low extracted parameters agree...
The statistical hadronization model ThermalFist was applied to numerous hadron yields measured in p+p collisions at √S = 8.8, 12.3 and 17.3 GeV, including recently published of ϕ -mesons, by the NA61/SHINE Collaboration. We consistently used energy-dependent widths Breit-Wigner mass distributions hadronic resonances, as this approach generally found provide better agreement with experimental data. well-established meson are consequently accounted for (although neglecting particle improve fit...