Qucosa – Hemholtz-Zentrum Dresden-Rossendorf
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Bericht der Frühjahrstagung der Studiengruppe für Elektronische Instrumentierung vom 3. bis 5. April 1995 in Jülich
Get PDFApplication of the Pulse-Shape Technique to Proton-Alpha Discrimination in Si-Detector Arrays
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Leckdetektion an komplizierten dreidimensionalen Topologien
Get PDFThe well-known methods of the acoustic leak localization using the attenuation differences or propagation time differences (e.g. cross correlation analysis) are restricted to the linear geometry of pipe lines. At complicated three-dimensional topologies they fail because there are several modes of the structure-borne sound that have different propagation velocities and because numerous connecting branches generate multiple sound reflexion. Therefore, a new method for detecting and localizing the leaks at complicated geometrical structures was developed and experimentally proved at an original facility. This approach is based on the detection of the leak induced airborne sound or structure-borne sound as well as on the application of pattern recognition procedures. The efficiency both of Fuzzy Logic and neural networks for the acoustic leak localization could be experimentally proved. Though the method has been prototypically developed for Russian pressurized water reactors of VVER-440 type, it can also be used by the self-learning capability of the classifiers at other pressurized facilities
Collective Effects and Multifragmentation in Heavy Ion Collisions at Intermediate Energies within a Hybrid Model
Get PDFThe reaction NN -> NNgamma in the 1 GeV region within an effective one-boson exchange model
Get PDFWithin an effective one- boson exchange parametrization of the T matrix of NN interactions we calculate cross sections for the reactions pp → ppγ and pn → pnγ for proton incidence energies in the order of 1 GeV. Besides bremsstrahlung processes we consider photons from ∆ decays and contributions from the η → γγ process, where the η is excited via the N1535 resonance. At beam energies above 700 MeV the ∆ decay channiel dsminates for large photon energies, while above the η threshold the η decay photons ähsw up only in a narrow window. The low energy photons stem frorn pure bremsstrahlunig processes
