1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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13 | // * work make any representation or warranty, express or implied, * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // neutron_hp -- source file |
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27 | // J.P. Wellisch, Nov-1996 |
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28 | // A prototype of the low energy neutron transport model. |
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29 | #include "G4NeutronHPWattSpectrum.hh" |
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30 | |
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31 | G4double G4NeutronHPWattSpectrum::Sample(G4double anEnergy) |
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32 | { |
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33 | G4double a = theApar.GetY(anEnergy)*eV; |
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34 | G4double b = theBpar.GetY(anEnergy)/eV; |
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35 | G4double result; |
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36 | G4double random, cut, max; |
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37 | max = std::sinh(std::sqrt(b*15.*a)); |
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38 | do |
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39 | { |
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40 | random = G4UniformRand(); |
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41 | result = -a*std::log(random); |
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42 | cut = G4UniformRand(); |
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43 | } |
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44 | while(cut>std::sinh(std::sqrt(b*result))/max); |
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45 | return result; |
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46 | } |
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