Geant4 Cross Reference |
1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 // 27 // This software was developed by Lawrence Liv 28 // 29 // Redistribution and use in source and binary 30 // modification, are permitted provided that t 31 // 32 // 1. Redistributions of source code must reta 33 // this list of conditions and the following 34 // 2. Redistributions in binary form must repr 35 // this list of conditions and the following 36 // and/or other materials provided with the 37 // 3. The name of the author may not be used t 38 // derived from this software without specif 39 // 40 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``A 41 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 42 // MERCHANTABILITY AND FITNESS FOR A PARTICULA 43 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DI 44 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGE 45 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES 46 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AN 47 // WHETHER IN CONTRACT, STRICT LIABILITY, OR T 48 // OTHERWISE) ARISING IN ANY WAY OUT OF THE US 49 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 50 // 51 // Copyright (c) 2006 The Regents of the Unive 52 // All rights reserved. 53 // UCRL-CODE-224807 54 // 55 // 56 // 57 58 #include <cmath> 59 #include "G4fissionEvent.hh" 60 #include "G4Exp.hh" 61 #include "G4Log.hh" 62 #include "G4Pow.hh" 63 64 #define nfissg 40 65 #define alphanegbin 26 66 67 G4int G4fissionEvent::G4SmpNugDist(G4int isoto 68 69 /* 70 Description 71 Sample Number of Photons from neutron indu 72 all isotopes using Tim Valentine's model ( 73 distribution, using nubar as a model param 74 */ 75 76 /* 77 Input 78 iso - isotope 79 Output 80 G4SmpNugDist - sampled multiplicity 81 */ 82 83 static G4double logcoeff[nfissg+1] = { 84 0.00000000000000e+00, 85 3.25809653802149e+00, 86 5.86078622346587e+00, 87 8.09437844497297e+00, 88 1.00753799138395e+01, 89 1.18671393830676e+01, 90 1.35093671183247e+01, 91 1.50291928720691e+01, 92 1.64462588918558e+01, 93 1.77753948391357e+01, 94 1.90281578076311e+01, 95 2.02137814732888e+01, 96 2.13397927361450e+01, 97 2.24124295384099e+01, 98 2.34369338549243e+01, 99 2.44177631079360e+01, 100 2.53587464524005e+01, 101 2.62632027266277e+01, 102 2.71340310844251e+01, 103 2.79737817391769e+01, 104 2.87847119553932e+01, 105 2.95688309141589e+01, 106 3.03279360625106e+01, 107 3.10636428574894e+01, 108 3.17774093252521e+01, 109 3.24705565058120e+01, 110 3.31442856005149e+01, 111 3.37996924530920e+01, 112 3.44377798564689e+01, 113 3.50594680730467e+01, 114 3.56656038766170e+01, 115 3.62569683628670e+01, 116 3.68342837279018e+01, 117 3.73982191769817e+01, 118 3.79493960962713e+01, 119 3.84883925970040e+01, 120 3.90157475227212e+01, 121 3.95319639951220e+01, 122 4.00375125617872e+01, 123 4.05328339990172e+01, 124 4.10183418147990e+01 125 }; 126 G4int i, A, Z; 127 G4double cpi[nfissg+1]; 128 G4double p, q, nubarg; 129 G4double r; 130 131 /* 132 No data is available for induced fission gam 133 distributions. Sample the negative binomial 134 probability distribution. 135 */ 136 A = (G4int) (isotope-1000*((G4int)(isotope/1 137 Z = (G4int) ((isotope-A)/1000); 138 G4Pow* Pow = G4Pow::GetInstance(); 139 nubarg = ((2.51-1.13e-5*Pow->powA(G4double(Z 140 /(-1.33+119.6*Pow->A13(G4double(Z)) 141 p = 1.*alphanegbin/(alphanegbin+nubarg); 142 q = 1.-p; 143 cpi[0] = G4Exp(logcoeff[0]+26.*G4Log(p)); 144 for (i=1; i<=nfissg; i++) cpi[i] = cpi[i-1] 145 for (i=0; i<=nfissg; i++) cpi[i] = cpi[i]/cp 146 147 r=fisslibrng(); 148 149 for(i=0; i<=nfissg; i++) if (r <= cpi[i]) re 150 151 // 152 // Fall through 153 // 154 155 G4cout << " SmpNugDist: random number " << r 156 return -1; 157 158 } 159