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Institute
- Physik (3401) (remove)
Heavy quark and charmonium production as well as their space-time evolution are studied in transport simulations of heavy-ion collisions at RHIC and LHC. In the partonic transport model Boltzmann Approach of MultiParton Scatterings (BAMPS) heavy quarks can be produced in initial hard parton scatterings or during the evolution of the quark-gluon plasma. Subsequently, they interact with the medium via binary scatterings with a running coupling and a more precise Debye screening which is derived from hard thermal loop calculations, participate in the flow and lose energy. We present results of the elliptic flow and nuclear modification factor of heavy quarks and compare them to available data. Furthermore, preliminary results on J/psi suppression at forward and mid-rapidity are reported for central and non-central collisions at RHIC. For this, we study cold nuclear matter effects and the dissociation as well as regeneration of J/psi in the quark-gluon plasma. XLIX International Winter Meeting on Nuclear Physics 24-28 January 2011 BORMIO, Italy
The multiplicity fluctuations in A+A collisions at SPS and RHIC energies are studied within the HSD transport approach. We find a dominant role of the fluctuations in the nucleon participant number for the final fluctuations. In order to extract physical fluctuations one should decrease the fluctuations in the participants number. This can be done considering very central collisions. The system size dependence of the multiplicity fluctuations in central A+A collisions at the SPS energy range – obtained in the HSD and UrQMD transport models – is presented. The results can be used as a ‘background’ for experimental measurements of fluctuations as a signal of the critical point. Event-by-event fluctuations of the K/p , K/p and p/p ratios in A+A collisions are also studied. Event-by-event fluctuations of the kaon to pion number ratio in nucleus-nucleus collisions are studied for SPS and RHIC energies. We find that the HSD model can qualitatively reproduce the measured excitation function for the K/p ratio fluctuations in central Au+Au (or Pb+Pb) collisions from low SPS up to top RHIC energies. The forward-backward correlation coefficient measured by the STAR Collaboration in Au+Au collisions at RHIC is also studied. We discuss the effects of initial collision geometry and centrality bin definition on correlations in nucleus-nucleus collisions. We argue that a study of the dependence of correlations on the centrality bin definition as well as the bin size may distinguish between these ‘trivial’ correlations and correlations arising from ‘new physics’. 5th International Workshop on Critical Point and Onset of Deconfinement - CPOD 2009, June 08 - 12 2009 Brookhaven National Laboratory, Long Island, New York, USA
Ziel der durchgeführten Experimente dieser Arbeit war es, den Versuch zu unternehmen, Cooper-Paare als Träger des supraleitenden Stroms direkt mit Hilfe des Photoelektrischen Effektes nachzuweisen. Die Methode der koinzidenten Photoelektronenspektroskopie zielt dabei auf den Nachweis von zwei kohärent emittierten Elektronen durch die Wechselwirkung mit einem Photon ab. Da elektrostatische Analysatoren typischerweise nur einen sehr kleinen Raumwinkel erfassen, was mit sehr geringen Koinzidenzraten einhergeht, ist im Zusammenhang mit dieser Arbeit ein Flugzeitprojektionssystem entwickelt worden, welches nahezu den gesamten Raumwinkel auf einem ortsauflösenden Detektor abbildet. Die zur Messung erforderliche gepulste Lichtquelle in Form von spezieller Synchrotronstrahlung ist so schwach eingestellt worden, daß nur vereinzelt Photonen auf die Probe gelangen konnten. Spektroskopiert wurde neben Testmessungen an Silberschichten sowohl ein Blei-Einkristall als Vertreter der klassischen BCS-Supraleiter als auch einkristallines Bi2Sr2CaCu2O8 aus der Gattung der Hochtemperatursupraleiter. Mit Anregungsenergien bis 40 eV konnte gezeigt werden, daß hinreichend glatte und saubere Oberflächen in der supraleitenden Phase innerhalb des Auflösevermögens von ungefähr 0.5 eV keine erkennbaren, signifikanten Unterschiede im Vergleich zur normalleitenden Phase aufweisen. Neben diesen Untersuchungen ist weiterhin ausführlich die einfache Photoemission an den verschiedenen Proben und insbesondere im Falle des Bleikristalls behandelt, da hier keine vergleichbaren Resultate bekannt sind. Dabei wird der gesamte Impulsraum besprochen und die Fermi-Fläche als dreidimensionales Modell erstellt, mit dessen Hilfe die Meßergebnisse diskutiert werden. In den theoretischen Beschreibungen sind verschiedene Modelle zur Cooper-Paar-Emission vorgestellt, wobei beispielsweise dem Impulsaustausch mit dem Kristall eine besondere Rolle beigemessen wird, da dieser bei direkten Anregungen nur über diskrete Gittervektoren erfolgen kann.
This work deals with the use of dielectrics with high permeability, so-called high-k dielectrics in organic thin-film field-effect transistors (FETs). The central part was the preparation of the high-k dielectric and its implementation in transistors, in which organic semiconductors were used as active layer. A field-effect transistor can be used to measure the charge carrier mobility. Employing high-k dielectrics the carrier concentration in the active layer can be greatly increased. In this way, high charge carrier concentrations in organic layers can be achieved without chemical doping. As high-k dielectric strontium titanate (STO) was selected. It is also available as a niobium-doped and therefore conducting substrate material. Thus, one has an ideal substrate for the growth of the dielectric layer in conjunction with a substrate which acts as gate electrode. As the organic semiconductor the small molecules pentacene and copper phthalocyanine (CuPc) were sublimated, as electrical contacts gold was used. As a key part of this work an ultra high vacuum chamber system was constructed for in situ preparation of field effect transistors. For the deposition of the organic thin films a molecular beam deposition chamber was built, including a manipulator and effusion cells as evaporation sources. For the preparation of the dielectric a sputtering chamber was set-up. Another chamber was used in conjunction with an effusion cell for the deposition of the gold contacts. For the structured deposition of the different layers in the devices a shadow mask system was implemented. Movable masks could be positioned by means of a wobble stick onto the sample carriers. The system thus allowed for the use of masks in all chambers. The different thin films required in the transistor structure were first individually prepared and characterized. For the characterization primarily X-ray diffraction and optical microscopy were used. The growth of pentacene was analyzed on aplha-AlO substrates. With X-ray diffraction the (00l) reflections of the thin film phase were observed. In growth studies of CuPc aplha-AlO and STO substrates were used. With X-ray diffraction the aplha-phase was detected. With increasing substrate temperature an increase in crystallinity, but also an increase in surface roughness was observed. The sputtering of STO as a high-k dielectric was studied and optimized. Simultaneously, a high deposition rate, a smooth film surface and good crystallinity of the layer were required. As the most important parameters the substrate temperature, pressure and sputtering power were identified. Argon and oxygen were employed as sputtering gases, as substrate MgO was used. The films showed in comparison to crystalline STO a distortion to larger lattice constants. The degree of distortion decreased with increasing chamber pressure, on the other hand, deposition rate decreased with increasing chamber pressure as well. By combining the individual deposition processes FETs in bottom-gate geometry were prepared. The first step was always sputtering of the STO dielectric on niobium-doped STO substrates. Subsequently, the electrodes and the organic layer were deposited. For comparison transistors on silicon substrates with silicon dioxide (SiO2) as the dielectric were prepared. To study the transistor properties a measurement setup was build. A dielectric constant of about 190 for the STO in the transistors was achieved. The transistors with CuPc as active layer showed p-type conduction behavior. The transistors with STO as dielectric had a much stronger response than those with SiO2. They reached mobilities of 2E-4 cm2/Vs at very low applied voltages of 3V. It could thus be demonstrated that STO is suitable as a dielectric for organic FETs, and that through the use of high-k dielectrics high charge carrier densities can be achieved.
Die transversale Betatronbewegung eines Ionenstrahls, genannt Tune, stellt neben der Strahlposition die wichtigste zu messende Strahleigenschaft für den stabilen Betrieb eines Kreisbeschleunigers dar. Die Einstellung des Tunes auf einen Arbeitspunkt unterliegt engen Grenzen, da eine Vielzahl resonanter Störungen existiert, die die Teilchenbewegung beeinflussen und somit Emittanzvergrößerung und Strahlverlust hervorrufen. Den gemessenen Tune mit hoher Auflösung in Zeit und Frequenz während der gesamten Beschleunigungsphase auszugeben ermöglicht eine Justierung der ionenoptischen Elemente der Strahlführung. Dadurch läßt sich die Teilchenzahl bis zur theoretischen Raumladungsgrenze erhöhen und darüber hinaus Teilchenverluste minimieren. Die Messungen wurden an Positionssonden (BPM) des Schwerionensynchrotrons SIS18 der "GSI Helmholtzzentrum für Schwerionenforschung GmbH" mit zwei verschiedenen Meßsystemen durchgeführt, was einen Vergleich der Systemauflösungen ermöglicht. Das Direkt Digitalisierende Meßsystem (DDM) wandelt das BPM-Elektrodensignal direkt nach der Verstärkerkette mit einer Rate von 125 MSa/s in digitale Daten um. Der Strahlschwerpunkt eines jeden Einzelbunches wird daraus mittels digitaler Prozessierung berechnet und durch Fouriertransformation dessen Frequenzspektrum bestimmt. Man erhält den fraktionalen Tune dadurch direkt im Basisband. Das am CERN entwickelte und für Parameter des SIS18 adaptierte Direct Diode Detection - System (DDD) zeigt ebenfalls den Tune im Basisband. Um den zu bearbeitenden Frequenzbereich erheblich zu reduzieren, werden bei diesem Verfahren die Bunchpeakwerte, die die Strahlschwingung enthalten, über ein RC-Element analog verzögert ausgegeben. Der erhaltene Tune kann daraus mit hoher Auflösung digitalisiert werden. In der vorliegenden Dissertation werden die Meßaufbauten, die digitale Prozessierung der BPM-Daten mittels neuer Algorithmen sowie die Auswertung und Berechnung des Tunes gezeigt. Es werden typische Tuneverläufe diskutiert und ein Arbeitsbereich definiert, bei dem stabile Tunemessungen mit S/N von 30-50 dB ohne meßbare Vergrößerung der Strahlemittanz möglich sind. Die Auflösung der Tunemessung beträgt δqy = 3.50 · 10−4 und δqx = 7.97 · 10−4 für Anregungskickwinkel im Arbeitsbereich. Darüber hinaus werden physikalische Anwendungen des Systems diskutiert, indem verschiedene Einflüsse von ionenoptischen- und Strahlparametern auf den Tuneverlauf gezeigt und ausgewertet werden.
In this work we study compact stars, i.e. neutron stars, as cosmic laboratories for the nuclear matter. With a mass of around 1 - 3 solar masses and a radius of around 10km, compact stars are very dense and, besides nucleons, can contain exotic matter such as hyperons or quark matter. The KaoS collaboration studied nuclear matter for densities up to 2-3 times saturation density by analysing kaon multiplicities from Au+Au and C+C collisions. The results show that nuclear matter in the corresponding density region is very compressible, with a compressibility of <200MeV. For such soft nuclear equations of state the maximum masses of neutron stars are ca. 1.8 - 1.9 solar masses, whereas the central densities are higher than 5 times nuclear saturation density and therefore point towards a possible phase transition to quark matter. If quark matter would be present in the interior of neutron stars, so-called hybrid stars, it could be produced already during their birth in supernova explosions. To study this we implement a quark matter phase transition in a hadronic equation of state which is used in supernova simulations. Supernova simulations of low and intermediate mass progenitors and two different bag constants show a collapse of the proto neutron star due to the softening of the equations of state in the quark-hadron mixed phase. The stiffening of the equation of state for pure quark matter halts the collapse and leads to the production of a second shock wave. The second shock wave is energetic enough to lead to an explosion of the star and produces a neutrino burst when passing the neutrinospheres. Furthermore, first studies of the longtime cooling of hybrid stars show, that colour superconductivity can significantly influence the cooling behaviour of hybrid stars, if all quarks form Cooper Pairs. For the so-called CSL phase (colour-spin locking) with pairing energies of several MeV, the cooling of the quark phase is suppressed and the hybrid star appears as a pure hadronic star.