T. Keutgen
A5039879199- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Nuclear Materials and Properties
- Muon and positron interactions and applications
- Advanced Thermodynamics and Statistical Mechanics
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Quantum many-body systems
- Protein Structure and Dynamics
- Quantum chaos and dynamical systems
- NMR spectroscopy and applications
- Theoretical and Computational Physics
UCLouvain
2010-2021
Institute of Modern Physics
2014
Chinese Academy of Sciences
2014
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2010-2013
Institute of Nuclear Physics, Polish Academy of Sciences
2011
Joint Institute for Nuclear Research
2011
National Centre for Nuclear Research
2011
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2010-2011
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2011
University of Warsaw
2011
CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV Large Hadron Collider (LHC). It currently involves more than 2000 physicists from 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle based on its unprecedented collision energy luminosity when it begins operation in 2007.
This report presents the capabilities of CMS experiment to explore rich heavy-ion physics programme offered by CERN Large Hadron Collider (LHC). The collisions lead nuclei at energies , will probe quark and gluon matter unprecedented values energy density. prime goal this research is study fundamental theory strong interaction — Quantum Chromodynamics (QCD) in extreme conditions temperature, density parton momentum fraction (low-x).
Data from a number of different experimental measurements are used to construct caloric curves for five regions nuclear mass. These qualitatively similar, and exhibit plateaus at the higher excitation energies. The limiting temperatures represented by decrease with increasing mass, in very good agreement results recent calculations employing either chiral symmetry model or Gogny interaction. This strongly favors soft equation state. Evidence is presented which suggests that critical energies...
We present charged-particle multiplicities as a function of pseudorapidity and collision centrality for the ${}^{197}\mathrm{Au}{+}^{197}\mathrm{Au}$ reaction at $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}200\mathrm{GeV}$. For $5%$ most central events we obtain...
Experimental analyses of moderate-temperature nuclear gases produced in the violent collisions 35 MeV/nucleon $^{64}\mathrm{Zn}$ projectiles with $^{92}\mathrm{Mo}$ and $^{197}\mathrm{Au}$ target nuclei reveal a large degree \ensuremath{\alpha} particle clustering at low densities. For these gases, temperature- density-dependent symmetry energy coefficients have been derived from isoscaling yields $A\ensuremath{\leqslant}4$. At densities 0.01 to 0.05 times ground-state density symmetric...
Clustering in low density nuclear matter has been investigated using the NIMROD multidetector at Texas A&M University. Thermal coalescence modes were employed to extract densities, ρ, and temperatures, T, for evolving systems formed collisions of 47A MeV (40)Ar+(112)Sn, (124)Sn (64)Zn+(112)Sn, (124)Sn. The yields d, t, (3)He, (4)He have determined ρ=0.002 0.03 nucleons/fm(3) T=5 11 MeV. experimentally derived equilibrium constants α particle production are compared with those predicted by a...
An extensive experimental survey of the features disassembly a small quasiprojectile system with $A~36$, produced in reactions 47 MeV/nucleon $^{40}\mathrm{Ar}\phantom{\rule{0.3em}{0ex}}+\phantom{\rule{0.3em}{0ex}}^{27}\mathrm{Al}$, $^{48}\mathrm{Ti}$, and $^{58}\mathrm{Ni}$, has been carried out. Nuclei excitation energy range 1--9 have investigated employing new method to reconstruct source. At an \ensuremath{\sim}5.6 many observables indicate presence maximal fluctuations deexcitation...
The relative isobaric yields of fragments produced in a series heavy-ion-induced multifragmentation reactions have been analyzed the framework modified Fisher model, primarily to determine ratio symmetry energy coefficient temperature, ${a}_{\mathrm{sym}}/T$, as function fragment mass $A$. extracted values increase from 5 $~$16 $A$ increases 9 37. These compared results calculations using antisymmetrized molecular dynamics (AMD) model together with statistical decay code gemini. calculated...
We present ratios of the numbers charged antiparticles to particles (pions, kaons and protons) in Au + collisions at $\sqrt{s_{NN}}=200$ GeV as a function rapidity range $y$=0-3. While particle midrapidity are approaching unity, $K^-/K^+$ $\bar{p}/p$ decrease significantly forward rapidities. An interpretation results within statistical model indicates reduction baryon chemical potential from $\mu_B \approx 130$MeV $y$=3 25$MeV $y$=0.
The reaction systems, $^{64}\mathrm{Zn}+^{58}\mathrm{Ni}$, $^{64}\mathrm{Zn}+^{92}\mathrm{Mo}$, $^{64}\mathrm{Zn}+^{197}\mathrm{Au}$, at 26, 35, and $47\phantom{\rule{0.2em}{0ex}}A\phantom{\rule{0.3em}{0ex}}\text{MeV}$, have been studied both in experiments with a $4\ensuremath{\pi}$ detector array, NIMROD, antisymmetrized molecular dynamics model calculations employing effective interactions corresponding to soft stiff equation of state (EOS). Direct experimental observables, such as...
In medium binding energies and Mott points for $d$, $t$, $^3$He $\alpha$ clusters in low density nuclear matter have been determined at specific combinations of temperature produced collisions 47$A$ MeV $^{40}$Ar $^{64}$Zn projectiles with $^{112}$Sn $^{124}$Sn target nuclei. The experimentally derived values the modified are good agreement recent theoretical predictions based upon implementation Pauli blocking effects a quantum statistical approach.
Measurements of the density dependence free symmetry energy in low clustered matter have been extended using NIMROD multi-detector at Texas A&M University. Thermal coalescence models were employed to extract densities, $\rho$, and temperatures, $T$, for evolving systems formed collisions 47 $A$ MeV $^{40}$Ar + $^{112}$Sn,$^{124}$Sn $^{64}$Zn $^{112}$Sn, $^{124}$Sn. Densities $0.03 \leq \rho/\rho_0 0.2$ temperatures range 5 10 sampled. The coefficients are found be good agreement with values...
Measurements, with the BRAHMS detector, of antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions square root [s(NN)] = 130 GeV, three different collision centralities. For collisions in 0%-40% centrality range, we find N(&pmacr;)/N(p) 0.64+/-0.04((stat))+/-0.06((syst)) y approximately 0, 0.66+/-0.03+/-0.06 0.7, 0.41+/-0.04+/-0.06 2. The ratios found to be nearly independent transverse momentum. antiproton proton rapidity densities vary...
The reactions ${}^{12}\mathrm{C}{+}^{116}\mathrm{Sn},$ ${}^{22}\mathrm{N}\mathrm{e}+\mathrm{A}\mathrm{g},$ ${}^{40}\mathrm{Ar}{+}^{100}\mathrm{Mo},$ and ${}^{64}\mathrm{Zn}{+}^{89}\mathrm{Y}$ have been studied at $47A \mathrm{MeV}$ projectile energy. For these the most violent collisions lead to increasing amounts of fragment light particle emission as mass increases. This is consistent with quantum molecular dynamics (QMD) model simulations collisions. Moving source fits charged data used...
We discuss experimental evidence for a nuclear phase transition driven by the different concentration of neutrons to protons. Different ratios neutron proton concentrations lead critical points transition. This is analogous transitions occurring in 4He-3He liquid mixtures. present results which reveal N/A (or Z/A) dependence and possible implications these observations terms Landau Free Energy description phenomena.
The ratio of the symmetry energy coefficient to temperature, ${a}_{\mathrm{sym}}/T$, in Fermi heavy-ion collisions, was experimentally extracted as a function fragment atomic number using isoscaling parameters and variance isotope distributions. values were compared results calculations made with an antisymmetrized molecular dynamics (AMD) model employing statistical decay code account for deexcitation excited primary fragments. experimental are good agreement calculated from final...
Isotope yield distributions in the multifragmentation regime were studied with high-quality isotope identification, focusing on intermediate mass fragments (IMFs) produced semiviolent collisions. The yields analyzed within framework of a modified Fisher model. Using ratio mass-dependent symmetry energy coefficient relative to temperature, ${a}_{\mathrm{sym}}/T$, extracted previous work and that pairing term, ${a}_{\mathrm{p}}/T$, from this work, assuming both reflect secondary decay...
For thefirst time primary hot isotope distributions are experimentally reconstructed in intermediate heavy-ion collisions and used with antisymmetrized molecular dynamics (AMD) calculations to determine density, temperature, symmetry energy coefficient a self-consistent manner. A kinematical focusing method is employed reconstruct the fragment-yield for multifragmentation events observed reaction system 64Zn+112Sn at 40 MeV/nucleon. The yield good agreement of AMD simulations. extracted...
The kinetic-energy variation of emitted light clusters has been employed as a clock to explore the time evolution temperature for thermalizing composite systems produced in reactions 26A, 35A, and 47A MeV Zn64 with Ni58, Mo92, Au197. For each system investigated, double-isotope ratio curve exhibits high maximum apparent temperature, range 10–25 MeV, at ejectile velocity. These values increase increasing projectile energy decrease target mass. which is reached ranges from 80 130 fm/c after...
The subsystems of the CMS silicon strip tracker were integrated and commissioned at Tracker Integration Facility (TIF) in period from November 2006 to July 2007. As part commissioning, large samples cosmic ray data recorded under various running conditions absence a magnetic field. Cosmic rays detected by scintillation counters used trigger readout up 15 % final detector, over 4.7 million events recorded. This document describes track reconstruction presents results on performance hit as...
Cross-sections for the production of 210Po nuclei in 6He + 206Pb collisions over incident energy range 14-18MeV were measured by means activation technique and a radiochemical analysis. The elastic scattering at 18.0MeV was also providing precise value cross-section this energy. results are variance with earlier experimental data rather accord predictions density-dependent barrier penetration model fusion process. A proper treatment beam distribution evaluation is discussed.
A wide variety of observables indicate that maximal fluctuations in the disassembly hot nuclei with $A\ensuremath{\sim}36$ occur at an excitation energy $5.6\ifmmode\pm\else\textpm\fi{}0.5\phantom{\rule{0.3em}{0ex}}\text{MeV}∕\text{nucleon}$ and temperature $8.3\ifmmode\pm\else\textpm\fi{}0.5\phantom{\rule{0.3em}{0ex}}\text{MeV}$. Associated this point are a number quantitative indicators apparent critical behavior. The associated caloric curve does not appear to show flattening such as seen...