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Institute
- Physik (3116) (remove)
The knowledge of the material budget with a high precision is fundamental for measurements of direct photon production using the photon conversion method due to its direct impact on the total systematic uncertainty. Moreover, it influences many aspects of the charged-particle reconstruction performance. In this article, two procedures to determine data-driven corrections to the material-budget description in ALICE simulation software are developed. One is based on the precise knowledge of the gas composition in the Time Projection Chamber. The other is based on the robustness of the ratio between the produced number of photons and charged particles, to a large extent due to the approximate isospin symmetry in the number of produced neutral and charged pions. Both methods are applied to ALICE data allowing for a reduction of the overall material budget systematic uncertainty from 4.5% down to 2.5%. Using these methods, a locally correct material budget is also achieved. The two proposed methods are generic and can be applied to any experiment in a similar fashion.
The knowledge of the material budget with a high precision is fundamental for measurements of direct photon production using the photon conversion method due to its direct impact on the total systematic uncertainty. Moreover, it influences many aspects of the charged-particle reconstruction performance. In this article, two procedures to determine data-driven corrections to the material-budget description in ALICE simulation software are developed. One is based on the precise knowledge of the gas composition in the Time Projection Chamber. The other is based on the robustness of the ratio between the produced number of photons and charged particles, to a large extent due to the approximate isospin symmetry in the number of produced neutral and charged pions. Both methods are applied to ALICE data allowing for a reduction of the overall material budget systematic uncertainty from 4.5% down to 2.5%. Using these methods, a locally correct material budget is also achieved. The two proposed methods are generic and can be applied to any experiment in a similar fashion.
Dielectrons are unique observables in ultra-relativistic heavy-ion collisions. Thanks to their penetrating nature, they carry information from all stages of the collision and can provide knowledge about pre-equilibirium dynamics, QGP temperature and transport coefficients, and chiral symmetry restoration. On the other hand, experimental challenges are enormous because production cross sections are small and the signal of interest is eclipsed by a huge combinatorial and physics background from light- and heavy-flavour hadron decays. In this talk the status of dielectron measurements with ALICE is shown and the perspectives with the recently installed and planned ALICE detector upgrades are discussed.
The inclusive production of the charm-strange baryon Ω0c is measured for the first time via its semileptonic decay into Ω−e+νe at midrapidity (|y| < 0.8) in proton–proton (pp) collisions at the centre-of-mass energy √s = 13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2 < pT < 12 GeV/c. The branching-fraction ratio BR(Ω0c → Ω−e+νe)/BR(Ω0c → Ω−π+) is measured to be 1.12 ± 0.22 (stat.) ± 0.27 (syst.). Comparisons with other experimental measurements, as well as with theoretical calculations, are presented.
The inclusive production of the charm-strange baryon Ω0c is measured for the first time via its semileptonic decay into Ω−e+νe at midrapidity (|y| < 0.8) in proton–proton (pp) collisions at the centre-of-mass energy √s = 13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2 < pT < 12 GeV/c. The branching-fraction ratio BR(Ω0c → Ω−e+νe)/BR(Ω0c → Ω−π+) is measured to be 1.12 ± 0.22 (stat.) ± 0.27 (syst.). Comparisons with other experimental measurements, as well as with theoretical calculations, are presented.
The strong force is one of the four fundamental interactions, and the theory of it is called Quantum Chromodynamics (QCD). A many-body system of strongly interacting particles (QCD matter) can exist in different phases depending on temperature (T) and baryonic chemical potential (µB). The phases and transitions between them can be visualized as µB−T phase diagram. Extraction of the properties of the QCD matter, such as compressibility, viscosity and various susceptibilities, and its Equation of State (EoS) is an important aspect of the QCD matter study. In the region of near-zero baryonic chemical potential and low temperatures the QCD matter degrees of freedom are hadrons, in which quarks and gluons are confined, while at higher temperatures partonic (quarks and gluons) degrees of freedom dominate. This partonic (deconfined) state is called quark-gluon plasma (QGP) and is intensively studied at CERN and BNL. According to lattice QCD calculations at µB=0 the transition to QGP is smooth (cross-over) and takes place at T≈156 MeV. The region of the QCD phase diagram, where matter is compressed to densities of a few times normal nuclear density (µB of several hundreds MeV), is not accessible for the current lattice QCD calculations, and is a subject of intensive research. Some phenomenological models predict a first order phase transition between hadronic and partonic phases in the region of T≲100 MeV and µB≳500 MeV. Search for signs of a possible phase transition and a critical point or clarifying whether the smooth cross-over is continuing in this region are the main goals of the near future explorations of the QCD phase diagram.
In the laboratory a scan of the QCD phase diagram can be performed via heavy-ion collisions. The region of the QCD phase diagram at T≳150 MeV and µB≈0 is accessible in collisions at LHC energies (√sNN of several TeV), while the region of T≲100 MeV and µB≳500 MeV can be studied with collisions at √sNN of a few GeV. The QCD matter created in the overlap region of colliding nuclei (fireball) is rapidly expanding during the collision evolution. In the fireball there are strong temperature and pressure gradients, extreme electromagnetic fields and an exchange of angular momentum and spin between the system constituents. These effects result in various collective phenomena. Pressure gradients and the scattering of particles, together with the initial spatial anisotropy of the density distribution in the fireball, form an anisotropic flow - a momentum (azimuthal) anisotropy in the emission of produced particles. The correlation of particle spin with the angular momentum of colliding nuclei leads to a global polarization of particles. A strong initial magnetic field in the fireball results in a charge dependence and particle-antiparticle difference of flow and polarization.
Anisotropic flow is quantified by the coefficients vₙ from a Fourier decomposition of the azimuthal angle distribution of emitted particles relative to the reaction plane spanned by beam axis and impact parameter direction. The first harmonic coefficient v₁ quantifies the directed flow - preferential particle emission either along or opposite to the impact parameter direction. The v₁ is driven by pressure gradients in the fireball and thus probes the compressibility of the QCD matter. The change of the sign of v₁ at √sNN of several GeV is attributed to a softening of the EoS during the expansion, and thus can be an evidence of the first order phase transition. The global polarization coefficient PH is an average value of the hyperon’s spin projection on the direction of the angular momentum of the colliding system. It probes the dynamics of the QCD matter, such as vorticity, and can shed light on the mechanism of orbital momentum transfer into the spin of produced particles.
In collisions at √sNN of several GeV, which probe the region of the QCD phase diagram at T≲100 MeV and µB≳500 MeV, hadron production is dominated by u and d quarks. Hadrons with strange quarks are produced near the threshold, what makes their yields and dynamics sensitive to the density of the fireball. Thus measurement of flow and polarization, in particular of (multi-)strange particles, provides experimental constraints on the EoS, that allows to extract transport coefficients of the QCD matter from comparison of data with theoretical model calculations of heavy-ion collisions.
For continuation of the annotation see the PDF of thesis
Im Rahmen dieser Doktorarbeit werden drei Schwerpunkte behandelt: 1) Die hocheffektive Beschleunigung von Elektronen und Protonen durch die Wechselwirkung von relativistischen Laserpulsen mit Schäumen. 2) Die Erzeugung und Messung hochintensiver Betatronstrahlung von direkt laserbeschleunigten (DLA-) Elektronen. 3) Die Anwendung von DLA-Elektronen für den biologischen FLASH-Effekt mit einer rekordbrechenden Dosisrate.
Die direkte Laserbeschleunigung von Elektronen wurde durch die Wechselwirkung eines sub-ps-Laserpulses mit einer Intensität von ~ 10^19 W/cm^2 mit einem Plasma nahe kritischer Elektronendichte (NCD) untersucht. Ein sub-mm langes NCD-Plasma wurde durch Erhitzen eines Schaums mit einer niedrigen Dichte mit einem ns-Puls von 10^13-10^14 W/cm^2 erzeugt. Die Experimente wurden an der PHELIX-Anlage (Petawatt Hoch- Energie Laser für Schwerionenexperimente) in den Jahren 2019 – 2023 durchgeführt. Während der Suche nach optimalen Bedingungen für die Beschleunigung von Elektronen und Protonen wurden die Parameter des ns-Pulses variiert und verschiedene Targets verwendet. Es wurde gezeigt, dass das Plasma im Schaum gute Voraussetzungen für die Erzeugung gerichteter, ultrarelativistischer DLA-Elektronen mit Energien von bis zu 100 MeV bietet. Die Elektronen weisen eine Boltzmann-ähnliche Energieverteilung mit einer Temperatur von 10-20 MeV auf.
Optimale Bedingungen für eine effektive Beschleunigung von DLA-Elektronen wurden bei der Kombination eines CHO-Schaums mit einer Dichte von 2 mg/cm3 und einer Dicke von 300-500 µm mit einer Metallfolie erreicht. Die Gesamtladung der detektierten Elektronen mit Energien über 1,5 MeV erreichte 0,5-1 µC mit der Umwandlungseffizienz der Laserenergie von ~ 20-30%.
Außerdem wird die Beschleunigung von Protonen durch DLA-Elektronen anders verursacht als bei typischer Target Normal Sheath Acceleration (TNSA). Für die Untersuchung der lokalen Protonenenergieverteilung wurden Magnetspektrometer unter verschiedenen Winkeln zur Laserachse verwendet. Dafür wurde eine Filtermethode entwickelt, welche es ermöglicht, Spektren von Protonen mit Energien von bis zu 100 MeV zu rekonstruieren. Es wurde gezeigt, dass am PHELIX durch die Kombination von einem ~ 300-400 µm dicken CHO-Schaum mit einer Dichte von 2 mg/cm^3 und einer 10 µm dicken Au-Folie bei einer Intensität des sub-ps-Pulses von ~ 10^19 W/cm^2 und unter Verwendung eines optimierten ns-Vorpulses eine optimale Protonenbeschleunigung erreicht wurde. Es wurde ein TNSA-ähnliches Regime mit einer maximalen Cut-off-Energie von 34±0,5 MeV beobachtet. Im Vergleich dazu wurde bei der typischen TNSA unter Verwendung einer 10 µm dicken Au-Folie als Target und derselben Laserintensität eine maximale Cut-off-Energie von 24±0,5 MeV gemessen. Darüber hinaus beobachteten wir einen sehr schwachen Abfall der Protonenanzahl in Abhängigkeit von der Protonenenergie (anders als bei der typischen TNSA) und eine sehr regelmäßige Protonenstrahlverteilung in einem breiten Winkelbereich bis zu hohen Energien. Dies könnte zur Verbesserung der Qualität der Protonenradiographie von Plasmafeldern genutzt werden.
Beim DLA-Prozess (im NCD-Plasma) entsteht Betatronstrahlung durch die Oszillationen von Elektronen in quasi-statischen elektrischen und magnetischen Feldern des Plasmakanals. Um diese Strahlung zu untersuchen, wurde ein neues modifiziertes Magnetspektrometer (X-MS) konstruiert. Das X-MS ermöglicht die 1D-Auflösung mehrerer Quellen. Dank dieser Spezifikation war es möglich, Betatronstrahlung von Bremsstrahlung der ponderomotorischen Elektronen im Metallhalter zu trennen und zu messen.
Im Experiment mit einem CHO-Schaum mit einer Dichte von 2 mg/cm^3 und einer Dicke von ~ 800 µm als Target wurde die von den optimierten DLA-Elektronen erzeugte Betatronstrahlung gemessen. Bei einer Peak-Intensität des dreieckigen ns-Pulses von ~ 3·10^13 W/cm^2 und des sub-ps-Pulses von ~ 10^19 W/cm^2, welcher 4±0,5 ns gegenüber dem ns-Puls verzögert war, betrug der Halbwinkel im FWHM-Bereich des Elektronenstrahls 17±2°. Unter diesen Bedingungen war die Betatronstrahlung mit einem Halbwinkel im FWHM-Bereich von 11±2° für die Photonen mit Energien über 10 keV ebenfalls gerichtet. Die Photonenanzahl mit Energien über 10 keV wurde auf etwa 3·10^10 / 3·10^11 (gerichtete Photonen / Photonen im Halbraum entlang der Laserstrahlrichtung) abgeschätzt. Die maximale Photonenanzahl pro Raumwinkel betrug ~2·10^11 photons/sr. Die Brillanz der registrierten Betatronstrahlung erreichte ~ 2·10^20 photons/s/mm^2/mrad^2/(0.1% BW) bei 10 keV.
Die Verwendung eines Hochstromstrahls aus DLA-Elektronen für die FLASH-Strahlentherapie ermöglicht das Erreichen einer Dosis von bis zu 50-70 Gy während eines sub-ps-Laserpulses. Im Jahr 2021, während der P213-Strahlzeit am PHELIX wurde der Sauerstoffkonzentrationsabfall bei der Bestrahlung von Medien (Wasser und andere biologische Medien) mit DLA-Elektronen in Abhängigkeit von der Dosis untersucht. Die Strahlendosis wurde hierbei indirekt gemessen. Hierfür wurde eine Rekonstruktionsmethode entwickelt, die es ermöglicht, die Dosis innerhalb des „Wasser-Containers“ auf Basis von Messungen außerhalb des Containers mit einem untersuchten Medium zu ermitteln. Es wurde eine gute Übereinstimmung zwischen dem Experiment und einer Monte-Carlo-Simulation für Wasser gezeigt. Die registrierte Dosisrate erreichte einen Rekordwert von ~ 70 TGy/s.
We study equilibrium as well as out-of-equilibrium properties of the strongly interacting QGP medium under extreme conditions of high temperature T and high baryon densities or baryon chemical potentials μB within a kinetic approach. We present the thermodynamic and transport properties of the QGP close to equilibrium in the framework of effective models with Nf=3 active quark flavours such as the Polyakov extended Nambu-Jona Lasinio (PNJL) and dynamical quasiparticle model with the CEP (DQPM-CP). Considering the transport coefficients and the EoS of the QGP phase, we compare our results with various results from the literature. Furthermore, out-of equilibrium properties of the QGP medium and in particular, the effect of a μB- dependence of thermodynamic and transport properties of the QGP are studied within the Parton-Hadron-String-Dynamics (PHSD) transport approach, which covers the full evolution of the system during HICs. We find that bulk observables and flow coefficients for strange hadrons as well as for antiprotons are more sensitive to the properties of the QGP, in particular to the μB - dependence of the QGP interactions.
Presolar grain isotopic ratios as constraints to nuclear physics inputs for s-process calculations
(2023)
The isotopic abundances in presolar SiC grains of AGB origin provide important and precise constraints to those star nucleosynthesis models. By comparing the values of the s-element abundances resulting from calculations with the ones measured in these dust grains, it turns out that new measurements of weak-interaction rates in ionized plasmas, as well as of neutron-capture cross sections, are needed, especially in the region near the neutron magic numbers 50 and 82.
Results on proton and Λ flow, calculated with the UrQMD model that incorporates different realistic density dependent equations of state, are presented. It is shown that the proton and hyperon flow shows sensitivity to the equation of state and especially to the appearance of a phase transition at densities below 4n0. Even though qualitatively hyperons and protons exhibit the same beam energy dependence of the flow, the quantitative results are different. In this context it is suggested that the hyperon measurements can be used to study the density dependence of the hyperon interaction in high density QCD matter.