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  • PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions  (2)
  • Binomial Distribution  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Sampling from binomial and poisson distributions: A method with bounded computation times (1980)
    Springer
    Computing 25 (1980), S. 193-208 
    Details
    ISSN: 1436-5057
    Keywords: Random Numbers ; Binomial Distribution ; Poisson Distribution ; Simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Ein exakter Verwerfungsalgorithmus wird konstruiert und ausgetestet. Das Verfahren erfordert durchschnittlich weniger als 3 gleichverteilte Zufallszahlen, solange die Standardabweichung σ der Verteilung mindestens 4 beträgt; diese Anzahl fällt monoton gegen 2,63 für σ→∞. Variable Parameter sind zugelassen; es werden keinerlei Unterprogramme für Stichproben von anderen statistischen Verteilungen benötigt.
    Notes: Abstract An accurate acceptance-rejection algorithm is devised and tested. The procedure requires an average of less than 3 uniform deviates whenever the standard deviation σ of the distribution is at least 4, and this number decreases monotonically to 2.63 as σ→∞. Variable parameters are permitted, and no subroutines for sampling from other statistical distributions are needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241999
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoproduction of neutral pion pairs from the proton (2000)
    Springer
    The European physical journal 9 (2000), S. 5-8 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500070048
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Double- π0 photoproduction from the deuteron (2000)
    Springer
    The European physical journal 9 (2000), S. 1-4 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500070047
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    Paper (German National Licenses)
    Fulltext
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