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  • 1
    Electronic Resource
    Electronic Resource
    How to avoid logarithms in comparisons with uniform random variables (1989)
    Springer
    Computing 41 (1989), S. 163-166 
    Details
    ISSN: 1436-5057
    Keywords: Primary 65 C 10 ; Random variables ; acceptance-rejection ; logarithm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Bei der Erzeugung nicht-gleichverteilter Zufallszahlen muß häufig der Logarithmus einer gleichverteilten Zufallszahl mit einer Testgröße verglichen werden. Es wird gezeigt, daß dieser Vergleich ohne den Aufruf einer Logarithmusroutine effizient durchführbar ist; zwei Prozeduren für diese Aufgabe werden vorgestellt und verglichen.
    Notes: Abstract In many algorithms for sampling from non-uniform distributions the logarithm of a uniform deviate must be compared with some test quantity. It is shown that all these comparisons can be done efficiently without calling a logarithm subprogram: two procedures for this task are presented and compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02238740
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An alias method for sampling from the normal distribution (1989)
    Springer
    Computing 42 (1989), S. 159-170 
    Details
    ISSN: 1436-5057
    Keywords: Primary 65C10 ; Random numbers ; normal distribution ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die effizientesten Algorithmen für Stichproben von der Standardnormalverteilung benötigen lange Listen von Konstanten. Die Größe dieser Tafeln wächst mit der verwendeten Präzision. Durch eine Anpassung der “Aliasmethode” von A.J. Walker an die Normalverteilung wird eine Stichprobenprozedur entwicklet, die nur drei feste Tafeln von je 128 Bytes braucht. Die neue Methode ist ebenso schnell wie ihre Konkurrenten und leichter zu implementieren.
    Notes: Abstract The most efficint algorithms for sampling from the standard normal distribution require long lists of constants. The size of these tables grows with the employed precision. By adapting A.J. Walker's “alias method” to the normal distribution a sampling procedure is developed which needs only three fixed tables of 128 bytes each. The new method is as fast as its competitors and easier to implement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02239745
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mass and Γ3π0/Γγγ decay branching ratio of theη-meson from the p(γ, η)p reaction (1995)
    Springer
    The European physical journal 351 (1995), S. 237-240 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near threshold photoproduction ofη-mesons from the proton has been measured at the MAMI accelerator with the TAPS spectrometer. The mass of theη-meson was deduced from the threshold energy forη-photoproduction. The result of m η =(547.12 ± 0.06 ± 0.25) MeV supports the low value of theη-mass reported from a dp →3Heη measurement at SATURNE in 1992. Theη-decay branching ratio Γ3π0/Γγγ was measured to be (0.832±0.005±0.012).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290901
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photon Asymmetry of Deuteron Photodisintegration Between 160 and 410 MeV (1999)
    Springer
    Few body systems 26 (1999), S. 213-226 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  The photon asymmetry Σ of the reaction has been measured across the photon energy range 160–410 MeV at the Mainz Microtron MAMI. Linearly polarized photons were obtained from coherent bremsstrahlung and their energies were determined with the Glasgow tagging spectrometer. The large acceptance detector DAPHNE enabled the outgoing protons to be measured over the complete azimuthal range and for polar angles from 35° to 155° in the c.m. system. The data are compared with existing results and recent theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050115
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A one-table method for sampling from continuous and discrete distributions (1995)
    Springer
    Computing 54 (1995), S. 127-146 
    Details
    ISSN: 1436-5057
    Keywords: 65C10 ; 65C05 ; Random number generation ; table method ; acceptance-rejection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02238128
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Near threshold photoproduction of η mesons from 4 He (1999)
    Springer
    The European physical journal 6 (1999), S. 83-89 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 13.60.Le Meson production – 14.20.Gk Baryon resonances with S=0 – 14.40.Aq π,K and η mesons – 25.20.Lj Photoproduction reactions – 27.10.+h A 〈 5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Photoproduction of η mesons from 4He has been measured for the first time. The experiment was performed at the Mainz Microtron (MAMI) using the TAPS photon spectrometer and the Glasgow/Mainz tagged photon facility. η mesons were identified in coincidence with recoil nucleons. Total and differential cross sections are presented in the photon energy range between threshold and 818 MeV. The exclusive data are used to determine the ratio of the elementary production cross sections on bound neutrons and protons, σn/σp= 0.68 ± 0.02 ± 0.09. In addition, upper limits for the total coherent cross section have been derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050320
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Single and double πo-photoproduction from the deuteron (1999)
    Springer
    The European physical journal 6 (1999), S. 309-324 
    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: Photoproduction of neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 792 MeV with the TAPS detector at the Mainz MAMI accelerator. Total and differential cross sections covering the full angular range have been obtained for coherent and incoherent single πo-photoproduction. Good agreement between model predictions and the data was found for the coherent process. The incoherent cross section in the energy region of the Δ(1232)-resonance is overestimated by existing models. A comparison to model predictions indicates that final state interaction effects are much more important than for the coherent reaction. However, the angular dependence of the data in the Δ-peak region follows the pattern expected from the dominant excitation of the M1+-multipole on the free nucleon. The energy and angular dependence of single πo-photoproduction in the second resonance region is remarkably different from the reaction on the free proton, indicating a strong nuclear effect. Finally the total cross section for double πo-photoproduction from the deuteron has been measured for the first time and was used to estimate the cross section for double πo-photoproduction from the neutron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050349
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The angular distribution of the 12C(γ,pn) reaction for Eγ=120−150 MeV (1998)
    Springer
    The European physical journal 1 (1998), S. 241-244 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.30.Fe Forces in hadronic systems and effective interactions – 25.20.Lj Photoproduction reactions – 27.20.+n 6 ≤ A ≤ 19
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The angular distribution of nucleons emitted in the 12C(γ,pn) reaction has been measured using tagged photons at the Mainz microtron MAMI. The variation of the reaction strength with the polar angles of the two emitted nucleons is reported for Eγ=120−150 MeV. The proton angular distribution peaks at more backward angles than the 2H(γ,p) differential cross section indicating a departure from the simple quasi-deuteron model of 2N photo-emission. The distribution shape is in reasonable agreement with microscopic theoretical models which include both π- and ρ-exchange.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050055
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    Paper (German National Licenses)
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