Y. Leifels
A5046131238- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Cold Atom Physics and Bose-Einstein Condensates
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Advanced NMR Techniques and Applications
- High-pressure geophysics and materials
- X-ray Diffraction in Crystallography
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Effects in Electronics
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Quantum chaos and dynamical systems
- Astro and Planetary Science
GSI Helmholtz Centre for Heavy Ion Research
2015-2024
Jagiellonian University
2006-2024
Kyoto University
2021
Saha Institute of Nuclear Physics
2021
Joint Institute for Nuclear Research
2019
Laboratoire de Physique Subatomique et des Technologies Associées
2016
GfK (Germany)
1998-2010
Technical University of Darmstadt
1995-2010
Gesellschaft für Elektrometallurgie (Germany)
2005-2009
Research Association for Combustion Engines
1996-2008
The dipole strength distribution above the one-neutron separation energy was measured in unstable 130Sn and double-magic 132Sn isotopes. results were deduced from Coulomb dissociation of secondary Sn beams with energies around 500 MeV/nucleon, produced by in-flight fission a primary 238U beam. In addition to giant resonance, resonancelike structure ("pygmy resonance") is observed at lower excitation 10 MeV exhausting few percent isovector E1 energy-weighted sum rule. are discussed context...
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,...
Many neutron star properties, such as the proton fraction, reflect symmetry energy contributions to equation of state that dominate when and densities differ strongly. To constrain these at suprasaturation densities, we measure spectra charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios pion measured high transverse momenta, deduce slope be $42<L<117\text{ }\text{ }\mathrm{MeV}$. This value is slightly lower but consistent $L$...
The three-body breakup ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}}^{4}\mathrm{He}+n+n$ is studied experimentally, using a secondary ${}^{6}\mathrm{He}$ ion beam of 240 MeV/nucleon incident on carbon and lead targets. Integrated cross sections for one- two-neutron knockout differential $d\ensuremath{\sigma}{/dE}^{*}$ $d\ensuremath{\sigma}/d\ensuremath{\vartheta}$ inelastic nuclear or electromagnetic excitations into the continuum are presented. $E$1-strength distribution deduced...
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.
Cluster and hypernuclei production in heavy-ion collisions is presently under active experimental theoretical investigation. Since clusters are weekly bound objects, their very sensitive to the dynamical evolution of system its interactions. The description cluster formation related $n$-body problem. Here we present novel transport approach PHQMD (parton-hadron-quantum-molecular dynamics) which designed provide a microscopic nuclear hypernucleus as well general particle reactions at...
The dipole response of stable and unstable neutron-rich oxygen nuclei masses A = 17 to 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. kinematically complete measurement the neutron decay channel inelastic scattering secondary projectiles from a Pb target was performed. Differential cross sections d sigma/dE were derived up 30 MeV energy. In contrast nuclei, deduced strength distribution appears be...
Peripheral fragmentation of a 287 MeV/nucleon beam the halo nucleus ${}^{11}\mathrm{Li}$ incident on carbon target has been studied in fragment-neutron coincidence experiment. The momentum distribution ${}^{10}\mathrm{Li}$ fragments gives access to removed neutron ${}^{11}\mathrm{Li}$. From shape distribution, $({1s}_{1/2}{)}^{2}$ contribution mixture and $({0p}_{1/2}{)}^{2}$ components ground-state wave function was determined be $(45\ifmmode\pm\else\textpm\fi{}10)%$. angular correlation...
Electromagnetic and nuclear inelastic scattering of the halo nucleus ${}^{11}\mathrm{Be}$ have been investigated by a measurement one-neutron removal channel, utilizing secondary beam with an energy 520 MeV/nucleon impinging on lead carbon targets. All decay products, i.e., ${}^{10}\mathrm{Be}$ fragments, neutrons, $\ensuremath{\gamma}$ rays detected in coincidence. Partial cross sections for population ground excited states were determined diffractive breakup as well electromagnetically...
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...
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)...
In the past two decades, pions created in high density regions of heavy ion collisions have been predicted to be sensitive at densities symmetry energy term nuclear equation state, a property that is key our understanding neutron stars. new experiment designed study energy, multiplicities negatively and positively charged measured with accuracy for central 132Sn+124Sn, 112Sn+124Sn, 108Sn+112Sn E/A=270 MeV SπRIT Time Projection Chamber. While individual pion are 4% accuracy, those...
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