W. Trautmann
A5081867014- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Nuclear Materials and Properties
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Particle Detector Development and Performance
- Statistical Mechanics and Entropy
- High-pressure geophysics and materials
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- Radiation Therapy and Dosimetry
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Crystallography and Radiation Phenomena
GSI Helmholtz Centre for Heavy Ion Research
2013-2023
Jagiellonian University
2011-2018
Institute of Physics
2018
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2016
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
2010-2016
Huzhou University
2010-2012
Goethe University Frankfurt
1990-2011
Institute for Nuclear Research
2011
Selçuk University
2010-2011
Maj Institute of Pharmacology
2011
Fragment distributions resulting from $\mathrm{Au}+\mathrm{Au}$ collisions at an incident energy of $E/A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}600\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$ are studied. From the measured fragment and neutron mass excitation decaying prefragments were determined. A temperature scale was derived observed yield ratios He Li isotopes. The relation between this isotope system exhibits a behavior which is expected for phase transition. nuclear vapor regime...
Directed and elliptic flows of neutrons light charged particles were measured for the reaction 197Au+197Au at 400 MeV/nucleon incident energy within ASY-EOS experimental campaign GSI laboratory. The detection system consisted Large Area Neutron Detector LAND, combined with parts CHIMERA multidetector, ALADIN Time-of-flight Wall, Washington-University Microball detector. latter three arrays used event characterization reaction-plane reconstruction. In addition, an array triple telescopes,...
Interpreting high-energy, astrophysical phenomena, such as supernova explosions or neutron-star collisions, requires a robust understanding of matter at supranuclear densities. However, our knowledge about dense explored in the cores neutron stars remains limited. Fortunately, is not only probed observations, but also terrestrial heavy-ion collision experiments. In this work, we use Bayesian inference to combine data from multi-messenger observations and collisions gold nuclei relativistic...
We have studied multifragment decays of Au projectiles after collisions with C, Al, and Cu targets at a bombarding energy 600 MeV nucleon. find that increasing violence the collision, measured via multiplicity light particles, mean intermediate-mass fragments originating from projectile first increases to maximum 〈MIMF〉≃3 then decreases again. Calculations using Boltzmann-Uehling-Uhlenbeck model suggest fragmentation is governed by Edep deposited into spectator 〈MIMF〉 reaches its around...
The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions neutron-rich systems at relativistic energies is proposed as an observable sensitive the strength symmetry term equation state supra-normal densities. results obtained from existing FOPI/LAND data for 197Au + collisions 400 MeV/nucleon comparison UrQMD model favor a moderately soft density dependence potential proportional (ρ/ρ0)γ γ=0.9±0.4.
Isotopic effects observed in fragmentation reactions induced by protons, deuterons, and $\ensuremath{\alpha}$ particles of incident energies between 660 MeV 15.3 GeV on ${}^{112}\mathrm{Sn}$ ${}^{124}\mathrm{Sn}$ targets are discussed. The exponential scaling the yield ratios with third component fragment isospin ${t}_{3}=(N\ensuremath{-}Z)/2$ is all reactions, parameters that depend energy. Breakup temperatures for these deduced from double isotopic yields tested their relation isoscaling...
Multifragmentation has been measured for $^{197}\mathrm{Au}$${+}^{197}$Au collisions at E/A=100, 250, and 400 MeV. The mean fragment multiplicity increases monotonically with the charged particle E/A=100 MeV, but decreases central incident energy, consistent onset of nuclear vaporization. Molecular dynamics calculations follow some trends underpredict observed multiplicities. Including statistical decay excited residues improves agreement peripheral worsens it collisions.
Correlations between intermediate-mass fragments (IMF's) and heavy were measured for $^{18}\mathrm{O}$-induced reactions on $^{\mathrm{nat}}\mathrm{Ag}$ $^{197}\mathrm{Au}$ at $\frac{E}{A}=84$ MeV. of two coincident IMF's show a depletion small relative velocities ${v}_{\mathrm{rel}}\ensuremath{\le}1$ cm/ns, reflecting the proximity point creation. However, time scales IMF emission derived from this correlation are similar to those binary-IMF-heavy-recoil coincidences which indicates...
The N/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer GSI Schwerionen Synchrotron (SIS). Stable and radioactive Sn La beams an incident energy 600 MeV per nucleon have used in order to explore a wide range isotopic compositions. For interpretation data, calculations statistical multifragmentation model for properly chosen ensemble excited sources were performed. parameters ensemble, representing variety spectator nuclei...
Neutron-proton elliptic flow difference and ratio have been shown to be promising observables in the attempt constrain density dependence of symmetry energy above saturation point from heavy-ion collision data. Their on model parameters such as microscopic nucleon-nucleon cross sections, compressibility nuclear matter, optical potential, parametrization is thoroughly studied. By using a derived momentum-dependent Gogny force conjunction with T\"ubingen quantum molecular dynamics (QMD)...
The experimental data obtained from the reaction of ${}^{6}$Li projectiles at 2$A$ GeV on a fixed graphite target were analyzed to study invariant mass distributions $d+{\ensuremath{\pi}}^{\ensuremath{-}}$ and $t+{\ensuremath{\pi}}^{\ensuremath{-}}$. Indications signal in $t+{\ensuremath{\pi}}^{\ensuremath{-}}$ observed with significances 5.3 $\ensuremath{\sigma}$ 5.0 $\ensuremath{\sigma}$, respectively, when including production target, 3.7 5.2 excluding target. estimated mean values for...
Reactions of the halo systems 11Be and 11Li (at 460 280 MeV/nucleon) with a carbon target demonstrate that ( n+9Li) has an (unbound) l=0 ground state very close to threshold. The neutron appreciable (1s1/2)2 (0p1/2)2 components.Received 20 December 1994DOI:https://doi.org/10.1103/PhysRevLett.75.1719©1995 American Physical Society
Isotopic effects in the fragmentation of excited target residues following collisions 12C on (112,124)Sn at incident energies 300 and 600 MeV per nucleon were studied with INDRA 4pi detector. The measured yield ratios for light particles fragments atomic number Z < or = 5 obey exponential law isotopic scaling. deduced scaling parameters decrease strongly increasing centrality to values smaller than 50% those obtained peripheral event groups. Symmetry-term coefficients, from these data within...
Directed and elliptic flow for the Au + system at incident energies between 40 150 MeV per nucleon has been measured using INDRA 4 pi multi-detector. For semi-central collisions, of Z <= 2 particles switches from in-plane to out-of-plane enhancement around 100 nucleon, in good agreement with result reported by FOPI Collaboration. The directed changes sign a bombarding energy 50 60 remains negative lower energies. conditions appearance possible origins are discussed.
The updated ultrarelativistic quantum molecular dynamics (UrQMD) model, a microscopic transport is used to study the directed and elliptic collective flows nuclear stopping in Au$+$Au collisions at incident energies covered by INDRA lower-energy FOPI experiments. It seen clearly that these observables are sensitive both potential terms (including isoscalar isovector parts as well momentum dependent term) equation of state (EoS) collision term [including Pauli blocking medium-modified...
Pulsed beams of $^{28}\mathrm{Si}$ and $^{4}\mathrm{He}$ were used to determine $g$ factors eight isomeric states in $^{144,146,147,148}\mathrm{Gd}$ by the time-differential spin-rotation method. The results show that proton neutron configurations contribute about equally generation angular momenta two high-spin yrast isomers $^{146,147}\mathrm{Gd}$ ($I\ensuremath{\sim}19 \mathrm{and} \frac{49}{2}$) whose detailed quasiparticle structure is suggested.
The A/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer SIS. A stable beam (124)Sn and radioactive beams (124)La (107)Sn 600 MeV per nucleon have used in order to explore a wide range isotopic compositions. Chemical freeze-out temperatures are found be nearly invariant respect produced spectator sources, consistent predictions for expanded systems. Small Coulomb effects (DeltaT approximately 0.6 MeV) appear residue...
The mean multiplicity of intermediate mass fragments (IMF) 〈MIMF〉 produced by fragmentation Au projectiles interacting with targets C, Al, Cu, and Pb at an incident energy E/A=600 MeV is compared to predictions statistical multifragmentation sequential evaporation models. initial conditions for the calculations were provided Boltzmann-Uehling-Uhlenbeck simulations. In high excitation regime where IMF reaches its maximum observed universal correlation between total charge Zbound projectile...