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  • Artikel: DFG Deutsche Nationallizenzen  (4)
  • PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions  (2)
  • 29.25  (1)
  • 65C05  (1)
Datenquelle
  • Artikel: DFG Deutsche Nationallizenzen  (4)
Materialart
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Computing 54 (1995), S. 127-146 
    ISSN: 1436-5057
    Schlagwort(e): 65C10 ; 65C05 ; Random number generation ; table method ; acceptance-rejection
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Für die Erzeugung von Stichproben aus weitgehend beliebigen VerteilungenF mit Dichtefunktionenf(x) oder Wahrscheinlichkeitenp k (in diskreten Fällen) wird eine praxisnahe Methode entwickelt. Die hohe Effizienz der Stichprobengewinnung wird mittels einer einzigen Hilfstafel erreicht, die eine Unterteilung des Bereiches vonF enthält. Beispiele stetiger und diskreter Verteilungen zeigen, daß die Prozedur einfach zu handhaben ist und daß ihre Geschwindigkeit nicht sehr von der speziellen VerteilungF abhängt.
    Notizen: Abstract A practical method for sampling from largely arbitrary distributionsF with density functionsf(x) or probabilitiesp k (in discrete cases) is developed. The high efficiency of the sampling routine is achieved by means of only one auxiliary table which contains a subdivision of the range ofF. Examples of continuous and discrete distributions demonstrate that the procedure is easy to apply and that its speed does not much depend on the particular target distributionF.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 33 (1984), S. 59-62 
    ISSN: 1432-0630
    Schlagwort(e): 7.77 ; 29.25
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract A pulsed LINAC is used for pair production in a tantalum target of 2.5 radiation lengths in an energy range from 80 to 260 MeV. Several well-annealed tungsten vanes are placed immediately behind the target and thermalize a small fraction of the fast positrons. The slow positrons are extracted from the target region and magnetically guided over a distance of 17 m to the detector at the end of an S-shaped solenoid. Two Nal detectors with well-known detection efficiency are used to register the 511 keV annihilationγ-rays. To reduce pile-up effects 50 mm of Pb were placed in front of the detectors. At an average electron current of 1 μA we could detect about 107 slow positrons per second. The positron yield is proportional to the electron current, and shows an increase with the electron energy for our target. The positron energy distribution has a FWHM of ∼ 1.8 eV.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1434-601X
    Schlagwort(e): PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total cross-section was determined and used to deduce the cross-section from the neutron. Due to the good statistical quality of the data Dalitz plots for the three particles in the exit channel (π0π0 N) could be constructed. The invariant mass distributions derived from them are presented in this paper. They indicate that the important reaction mechanism in the second resonance region is a sequential decay pattern involving the population of the Δ(1232)-resonance as an intermediate state.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1434-601X
    Schlagwort(e): PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at E γ = 740 MeV. Dalitz plots of m 2(π0π0) versus m 2(p,π0) for seven bins of incident photon energy have been analysed. For E γ 〉 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D 13(1520) and also the P 11(1440)-resonance.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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