[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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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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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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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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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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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 | // |
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| 27 | // This software was developed by Lawrence Livermore National Laboratory. |
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| 28 | // |
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| 29 | // Redistribution and use in source and binary forms, with or without |
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| 30 | // modification, are permitted provided that the following conditions are met: |
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| 31 | // |
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| 32 | // 1. Redistributions of source code must retain the above copyright notice, |
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| 33 | // this list of conditions and the following disclaimer. |
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| 34 | // 2. Redistributions in binary form must reproduce the above copyright notice, |
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| 35 | // this list of conditions and the following disclaimer in the documentation |
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| 36 | // and/or other materials provided with the distribution. |
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| 37 | // 3. The name of the author may not be used to endorse or promote products |
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| 38 | // derived from this software without specific prior written permission. |
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| 39 | // |
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| 40 | // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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| 41 | // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 42 | // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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| 43 | // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 44 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 45 | // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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| 46 | // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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| 47 | // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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| 48 | // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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| 49 | // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 50 | // |
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| 51 | // Copyright (c) 2006 The Regents of the University of California. |
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| 52 | // All rights reserved. |
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| 53 | // UCRL-CODE-224807 |
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| 54 | // |
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| 55 | // |
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| 56 | // $Id: G4SmpNuDistDataU232_234_236_238.cc,v 1.2 2007/06/01 13:46:53 gcosmo Exp $ |
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| 57 | // |
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| 58 | |
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| 59 | #include <cmath> |
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| 60 | #include "G4fissionEvent.hh" |
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| 61 | |
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| 62 | G4int G4fissionEvent::G4SmpNuDistDataU232_234_236_238(G4double nubar) { |
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| 63 | |
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| 64 | /* |
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| 65 | Description |
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| 66 | Sample Number of Neutrons from fission in U-232, U-234, U-236 |
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| 67 | and U-238 using Zucker and Holden's tabulated data for U-238 |
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| 68 | The P(nu) distribution is given as a function of the average |
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| 69 | number of neutrons from fission, based on interpolation of the |
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| 70 | U-238 data from Zucker and Holden. |
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| 71 | */ |
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| 72 | |
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| 73 | /* |
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| 74 | Input |
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| 75 | nubar - average number of neutrons per fission |
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| 76 | Output |
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| 77 | G4SmpNuDistDataU232_234_236_238 - sampled multiplicity |
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| 78 | |
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| 79 | */ |
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| 80 | |
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| 81 | G4double pnu[9], cpnu, sum; |
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| 82 | G4double r; |
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| 83 | |
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| 84 | /* |
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| 85 | Check if nubar is within the range of experimental values |
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| 86 | */ |
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| 87 | if (nubar >= 2.25 && nubar <= 3.80) { |
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| 88 | /* |
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| 89 | Use Zucker and Holden Data |
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| 90 | */ |
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| 91 | pnu[0]=-7.705432e-3*std::pow(nubar,3)+8.904671e-2*std::pow(nubar,2)-3.488123e-1*nubar+4.627291e-1; |
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| 92 | pnu[1]=-2.879938e-2*std::pow(nubar,3)+3.629189e-1*std::pow(nubar,2)-1.545284*nubar+2.229503; |
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| 93 | pnu[2]=6.543684e-2*std::pow(nubar,3)-6.673117e-1*std::pow(nubar,2)+2.087358*nubar-1.771396; |
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| 94 | pnu[3]=1.412971e-2*std::pow(nubar,3)-2.309842e-1*std::pow(nubar,2)+1.022451*nubar-1.032235; |
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| 95 | pnu[4]=-5.163167e-2*std::pow(nubar,3)+4.457516e-1*std::pow(nubar,2)-1.114981*nubar+9.484241e-1; |
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| 96 | pnu[5]=8.758841e-4*std::pow(nubar,3)+3.707461e-2*std::pow(nubar,2)-1.565149e-1*nubar+1.851039e-1; |
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| 97 | pnu[6]=-3.871089e-5*std::pow(nubar,3)+1.936524e-2*std::pow(nubar,2)-8.091057e-2*nubar+9.019871e-2; |
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| 98 | pnu[7]=3.945995e-3*std::pow(nubar,3)-2.697509e-2*std::pow(nubar,2)+6.237296e-2*nubar-4.820745e-2; |
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| 99 | pnu[8]=1.708054e-3*std::pow(nubar,4)-1.706039e-2*std::pow(nubar,3)+6.550213e-2*std::pow(nubar,2)-1.135e-1*nubar+7.443828e-2; |
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| 100 | |
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| 101 | sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8]; |
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| 102 | |
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| 103 | pnu[0]=pnu[0]/sum; |
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| 104 | pnu[1]=pnu[1]/sum; |
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| 105 | pnu[2]=pnu[2]/sum; |
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| 106 | pnu[3]=pnu[3]/sum; |
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| 107 | pnu[4]=pnu[4]/sum; |
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| 108 | pnu[5]=pnu[5]/sum; |
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| 109 | pnu[6]=pnu[6]/sum; |
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| 110 | pnu[7]=pnu[7]/sum; |
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| 111 | pnu[8]=pnu[8]/sum; |
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| 112 | |
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| 113 | r=fisslibrng(); |
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| 114 | |
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| 115 | if(r <= pnu[0]) return 0; |
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| 116 | |
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| 117 | cpnu=pnu[0]+pnu[1]; |
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| 118 | if(r <= cpnu) return 1; |
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| 119 | |
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| 120 | cpnu=cpnu+pnu[2]; |
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| 121 | if(r <= cpnu) return 2; |
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| 122 | |
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| 123 | cpnu=cpnu+pnu[3]; |
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| 124 | if(r <= cpnu) return 3; |
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| 125 | |
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| 126 | cpnu=cpnu+pnu[4]; |
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| 127 | if(r <= cpnu) return 4; |
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| 128 | |
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| 129 | cpnu=cpnu+pnu[5]; |
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| 130 | if(r <= cpnu) return 5; |
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| 131 | |
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| 132 | cpnu=cpnu+pnu[6]; |
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| 133 | if(r <= cpnu) return 6; |
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| 134 | |
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| 135 | cpnu=cpnu+pnu[7]; |
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| 136 | if(r <= cpnu) return 7; |
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| 137 | else return 8; |
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| 138 | |
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| 139 | } else { |
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| 140 | /* |
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| 141 | Use Terrell's formula |
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| 142 | */ |
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| 143 | return (G4int) G4SmpTerrell(nubar); |
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| 144 | } |
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| 145 | } |
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