1,074 research outputs found
A study of transverse energy production and forward flow in 160- and 32s-nucleus collisions at 60 and 200 Gev, nucleon / S. Margetis. Gesellschaft für Schwerionenforschung mbH
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Hadron production in S+nucleus collisions at 200 GeV/nucleon
No full textCentral collisions between nuclei at relativistic energies form a hot and dense hadronic system over a large volume. Phenomenological models, as well as QCD calculations on the lattice, predict a phase transition in nuclear matter leading to deconfinement, a state of matter in which quarks and gluons are free to move inside the entire volume of the deconfined region. This new state was given the name of Quark Gluon Plasma (QGP). Based on the conjecture that collisions of heavy nuclei at high energies can create the necessary condition of a high energy density thermalized system, a series of experiments were built to search for possible signals of QGP creation. The NA35 collaboration uses a wide acceptance apparatus at the CERN SPS which detects the majority of charged hadrons (h{sup {+-}}), and neutral strange particles produced in reactions of p, {sup 16}O and {sup 32}S projectiles at 60 and 200 GeV/nucleon lab momentum on different targets. It consists of two major tracking devices which provide the momentum measurement of the charged particles: a 2 m long streamer chamber (SC) which is placed inside a 1.5 T vertex magnet, viewed by three cameras, and a 2.5x1.5x1.0 m{sup 3} Time Projection Chamber (TPC). A set of calorimeters was used as the basic trigger device of the experiment, to select central (small impact parameter) collisions. In the data presented here, a calorimeter placed in the beam path selects near head-on collisions, i.e. events where only a small amount of energy (mostly spectator nucleon energy) was detected in an angular acceptance of less than 0.3 degrees around the beam axis. The data sample consists of three systems: S+S, S+Ag and S+Au at 200 GeV/c with trigger cross section of 3, 3.2 and 6% of the total inelastic cross section, respectively
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Strange particle and antiproton production in S + nucleus collisions at 200 GeV/nucleon
No full textCentral S+S, S+Ag and S+Au collisions at 200 GeV/nucleon were studied in experiment NA35 at the CERN SPS. Recent results on strange particle production as well as the preliminary results on antiproton production are presented and discussed. Enhanced strangeness production relative to the pion and antiproton yields is observed in nucleus-nucleus collisions relative to p-p and p-A. Microscopic string models fail to consistently describe the available set of data
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Hadron production in S + nucleus collisions at 200 GeV/nucleon
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Strange particle and antiproton production in S + nucleus collisions at 200 GeV/nucleon
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A study of transverse energy production and forward flow in O- and S-nucleus collisions at 60 and 200 GeV/nucleon
No full textClinical and multifocal-electroretinographic findings of congenital tilted disc syndrome associated with choroidal neovascularization: A case report
No full textPurpose: To report a case of a tilted disc syndrome associated with choroidal neovascularization. Methods: A 55-year-old male patient presented with blurred vision and metamorphopsia of the left eye. He underwent complete ophthalmologic examination, fluorescein angiography, optical coherence tomography (OCT) and multifocal-electroretinogram (mf-ERG). Results: All features are consistent with a tilted disc syndrome complicated with a small neovascular membrane. OCT confirmed the presence of a serous retinal detachment. Mf-ERG confirmed a decrease of electrical activity of the photoreceptors in area 1 (fovea). The patient refused to be treated. Conclusion: Macular serous retinal detachment due to subretinal leakage is a rare complication of tilted disc syndrome. To the author's knowledge, this is the first time a tilted disc syndrome with choroidal neovascularization is documented by means of OCT and mf-ERG. These are the only objective tools in order to assess objectively the anatomical and functional damage accordingly. © Springer-Verlag 2007
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