| 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: G4SmpNugDist.cc,v 1.4 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 | #define nfissg 40
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| 63 | #define alphanegbin 26
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| 64 |
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| 65 | G4int G4fissionEvent::G4SmpNugDist(G4int isotope, G4double nubar) {
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| 66 |
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| 67 | /*
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| 68 | Description
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| 69 | Sample Number of Photons from neutron induced fission in
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| 70 | all isotopes using Tim Valentine's model (negative binomial
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| 71 | distribution, using nubar as a model parameter)
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| 72 | */
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| 73 |
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| 74 | /*
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| 75 | Input
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| 76 | iso - isotope
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| 77 | Output
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| 78 | G4SmpNugDist - sampled multiplicity
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| 79 | */
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| 80 |
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| 81 | static G4double logcoeff[nfissg+1] = {
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| 82 | 0.00000000000000e+00,
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| 83 | 3.25809653802149e+00,
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| 84 | 5.86078622346587e+00,
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| 85 | 8.09437844497297e+00,
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| 86 | 1.00753799138395e+01,
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| 87 | 1.18671393830676e+01,
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| 88 | 1.35093671183247e+01,
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| 89 | 1.50291928720691e+01,
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| 90 | 1.64462588918558e+01,
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| 91 | 1.77753948391357e+01,
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| 92 | 1.90281578076311e+01,
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| 93 | 2.02137814732888e+01,
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| 94 | 2.13397927361450e+01,
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| 95 | 2.24124295384099e+01,
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| 96 | 2.34369338549243e+01,
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| 97 | 2.44177631079360e+01,
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| 98 | 2.53587464524005e+01,
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| 99 | 2.62632027266277e+01,
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| 100 | 2.71340310844251e+01,
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| 101 | 2.79737817391769e+01,
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| 102 | 2.87847119553932e+01,
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| 103 | 2.95688309141589e+01,
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| 104 | 3.03279360625106e+01,
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| 105 | 3.10636428574894e+01,
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| 106 | 3.17774093252521e+01,
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| 107 | 3.24705565058120e+01,
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| 108 | 3.31442856005149e+01,
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| 109 | 3.37996924530920e+01,
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| 110 | 3.44377798564689e+01,
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| 111 | 3.50594680730467e+01,
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| 112 | 3.56656038766170e+01,
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| 113 | 3.62569683628670e+01,
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| 114 | 3.68342837279018e+01,
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| 115 | 3.73982191769817e+01,
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| 116 | 3.79493960962713e+01,
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| 117 | 3.84883925970040e+01,
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| 118 | 3.90157475227212e+01,
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| 119 | 3.95319639951220e+01,
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| 120 | 4.00375125617872e+01,
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| 121 | 4.05328339990172e+01,
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| 122 | 4.10183418147990e+01
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| 123 | };
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| 124 | G4int i, A, Z;
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| 125 | G4double cpi[nfissg+1];
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| 126 | G4double p, q, nubarg;
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| 127 | G4double r;
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| 128 |
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| 129 | /*
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| 130 | No data is available for induced fission gamma number
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| 131 | distributions. Sample the negative binomial cumulative
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| 132 | probability distribution.
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| 133 | */
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| 134 | A = (G4int) (isotope-1000*((G4int)(isotope/1000)));
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| 135 | Z = (G4int) ((isotope-A)/1000);
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| 136 | nubarg = ((2.51-1.13e-5*std::pow(G4double(Z),2.)*std::sqrt(G4double(A)))*nubar+4.0)
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| 137 | /(-1.33+119.6*std::pow(G4double(Z),1./3.)/G4double(A));
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| 138 | p = 1.*alphanegbin/(alphanegbin+nubarg);
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| 139 | q = 1.-p;
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| 140 | cpi[0] = std::exp(logcoeff[0]+26.*std::log(p));
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| 141 | for (i=1; i<=nfissg; i++) cpi[i] = cpi[i-1] + std::exp(logcoeff[i]+26.*std::log(p)+i*std::log(q));
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| 142 | for (i=0; i<=nfissg; i++) cpi[i] = cpi[i]/cpi[nfissg-1];
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| 143 |
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| 144 | r=fisslibrng();
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| 145 |
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| 146 | for(i=0; i<=nfissg; i++) if (r <= cpi[i]) return i;
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| 147 |
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| 148 | //
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| 149 | // Fall through
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| 150 | //
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| 151 |
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| 152 | G4cout << " SmpNugDist: random number " << r << " out of range " << G4endl;
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| 153 | return -1;
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| 154 |
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| 155 | }
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