K. Siwek-Wilczyńska
A5081870239- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Fusion and Nuclear Reactions
- Nuclear Materials and Properties
- Advanced Chemical Physics Studies
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- stochastic dynamics and bifurcation
- Nuclear and radioactivity studies
- Particle accelerators and beam dynamics
- Spectroscopy and Quantum Chemical Studies
- Advanced Thermodynamics and Statistical Mechanics
- Laser-induced spectroscopy and plasma
- Astro and Planetary Science
- Radioactive element chemistry and processing
- Rare-earth and actinide compounds
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
University of Warsaw
2013-2024
National Centre for Nuclear Research
1996-2022
Rudjer Boskovic Institute
2006-2018
Joint Institute for Nuclear Research
1973-2014
GSI Helmholtz Centre for Heavy Ion Research
2011-2014
Frankfurt Institute for Advanced Studies
2014
Goethe University Frankfurt
2014
Excellence Cluster Universe
2014
Technical University of Munich
2014
Korea University
2011
The energy dependence of incomplete-fusion reactions $^{160}\mathrm{Gd}$($^{12}\mathrm{C}$,$\ensuremath{\alpha}$) and $^{160}\mathrm{Gd}$($^{12}\mathrm{C}$,$2\ensuremath{\alpha}$) has been studied by means $\ensuremath{\alpha}\ensuremath{-}\ensuremath{\gamma}$ coincidences in the range bombarding energies 7.5-16.7 MeV/A. Excitation functions are interpreted terms a generalized concept critical angular momentum. An threshold (of about 15 MeV/A) is predicted at which projectile fragmentation...
A complete set of existing data on hot fusion reactions leading to synthesis superheavy nuclei $Z=114--118$, obtained in a series experiments Dubna and later GSI Darmstadt LBNL Berkeley, was analyzed terms an angular-momentum-dependent version the fusion-by-diffusion (FBD) model with fission barriers ground-state masses taken from Warsaw macroscopic-microscopic (involving nonaxial shapes) Kowal et al. The only empirically adjustable parameter model, injection-point distance...
Four different combinations of 4496Ru and 4096Zr nuclei, both as projectile target, were investigated at the same bombarding energy 400AMeV using a 4π detector. The degree isospin mixing between target nucleons is mapped across large portion phase space two isospin-tracer observables, number measured protons tritium to 3He yield ratio. experimental results show that global equilibrium not reached even in most central collisions. Quantitative measures stopping are extracted from data. They...
Existing data on near-barrier fusion excitation functions for 48 medium and heavy nucleus-nucleus systems have been analyzed using a simple ``diffused-barrier formula'' derived assuming the Gaussian shape of barrier height distributions. The obtained mean values used then determination parameters empirical potential, assumed to Woods-Saxon shape. heights calculated with this potential are reproduced an accuracy about $1\phantom{\rule{0.3em}{0ex}}\text{MeV}$, while other frequently...
We present a complete systematics (excitation functions and system-size dependences) of global stopping side flow for heavy ion reactions in the energy range between $0.09A$ $1.93A\text{ }\text{ }\mathrm{GeV}$. For heaviest system, $\mathrm{Au}+\mathrm{Au}$, we observe plateau maximal extending from about $0.2A$ to $0.8A\text{ }\mathrm{GeV}$ with fast drop on both sides. The degree stopping, which is shown remain significantly below expectations full scenario, found be highly correlated amount flow.
Semiperipheral collisions in the $^{124}\mathrm{Sn}+^{64}\mathrm{Ni}$ reaction at 35 MeV/nucleon were studied using forward part of Charged Heavy Ion Mass and Energy Resolving Array. Nearly completely determined ternary events involving projectilelike fragments (PLF), targetlike (TLF), intermediate mass (IMF) selected. A new method studying mechanism, focusing on analysis correlations between relative velocities IMF+PLF IMF+TLF subsystems, is proposed. The velocity provide information time...
We present a modified version of the Fusion by Diffusion (FBD) model aimed at describing synthesis superheavy nuclei in cold fusion reactions, which low excited compound nucleus emits only one neutron. The FBD accounts for angular momentum dependence three basic factors determining evaporation residue cross section: capture section ${\ensuremath{\sigma}}_{\text{cap}}(l)$, probability ${P}_{\text{fus}}(l)$, and survival ${P}_{\text{surv}}(l)$. hindrance factor, inverse is treated terms...
The production of charged pions, protons, and deuterons has been studied in central collisions ${}^{58}\mathrm{Ni}$ on at incident beam energies $1.06A$, $1.45A$, $1.93A$ GeV. dependence transverse-momentum rapidity spectra the energy centrality collison is presented. It shown that scaling mean shift protons established for between 10A 200A GeV Brookhaven AGS CERN SPS accelerators valid down to $1A$ degree nuclear stopping discussed; quantum molecular dynamics calculations reproduce measured...
We present new experimental data on directed flow in collisions of $\mathrm{Au}+\mathrm{Au},$ $\mathrm{Xe}+\mathrm{CsI},$ and $\mathrm{Ni}+\mathrm{Ni}$ at incident energies from $90A$ to $400A\mathrm{MeV}.$ study the centrality system dependence integral differential for particles selected according charge. All features are compared with isospin quantum molecular dynamics (IQMD) model calculations an attempt extract information about nuclear matter equation state (EoS). show that combination...
In order to verify methods of calculating the fission-evaporation competition in reactions used synthesize new super-heavy nuclei ``cold'' $(1n)$ and ``hot'' $(3n,4n)$ fusion reactions, we present an analysis existing experimental data on evaporation-residue cross sections two selected $^{208}\mathrm{Pb}$($^{16}\mathrm{O}$, xn) $^{236}\mathrm{U}$($^{12}\mathrm{C}$, xn), for which complementary information necessary unambiguously calculate survival probabilities is available: precisely...