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Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // This software was developed by Lawrence Livermore National Laboratory. 00028 // 00029 // Redistribution and use in source and binary forms, with or without 00030 // modification, are permitted provided that the following conditions are met: 00031 // 00032 // 1. Redistributions of source code must retain the above copyright notice, 00033 // this list of conditions and the following disclaimer. 00034 // 2. Redistributions in binary form must reproduce the above copyright notice, 00035 // this list of conditions and the following disclaimer in the documentation 00036 // and/or other materials provided with the distribution. 00037 // 3. The name of the author may not be used to endorse or promote products 00038 // derived from this software without specific prior written permission. 00039 // 00040 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00041 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00042 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 00043 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00044 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00045 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 00046 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00047 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 00048 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 00049 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00050 // 00051 // Copyright (c) 2006 The Regents of the University of California. 00052 // All rights reserved. 00053 // UCRL-CODE-224807 00054 // 00055 // 00056 // $Id: G4SmpNugDist.cc 69860 2013-05-16 14:39:02Z gcosmo $ 00057 // 00058 00059 #include <cmath> 00060 #include "G4fissionEvent.hh" 00061 00062 #define nfissg 40 00063 #define alphanegbin 26 00064 00065 G4int G4fissionEvent::G4SmpNugDist(G4int isotope, G4double nubar) { 00066 00067 /* 00068 Description 00069 Sample Number of Photons from neutron induced fission in 00070 all isotopes using Tim Valentine's model (negative binomial 00071 distribution, using nubar as a model parameter) 00072 */ 00073 00074 /* 00075 Input 00076 iso - isotope 00077 Output 00078 G4SmpNugDist - sampled multiplicity 00079 */ 00080 00081 static G4double logcoeff[nfissg+1] = { 00082 0.00000000000000e+00, 00083 3.25809653802149e+00, 00084 5.86078622346587e+00, 00085 8.09437844497297e+00, 00086 1.00753799138395e+01, 00087 1.18671393830676e+01, 00088 1.35093671183247e+01, 00089 1.50291928720691e+01, 00090 1.64462588918558e+01, 00091 1.77753948391357e+01, 00092 1.90281578076311e+01, 00093 2.02137814732888e+01, 00094 2.13397927361450e+01, 00095 2.24124295384099e+01, 00096 2.34369338549243e+01, 00097 2.44177631079360e+01, 00098 2.53587464524005e+01, 00099 2.62632027266277e+01, 00100 2.71340310844251e+01, 00101 2.79737817391769e+01, 00102 2.87847119553932e+01, 00103 2.95688309141589e+01, 00104 3.03279360625106e+01, 00105 3.10636428574894e+01, 00106 3.17774093252521e+01, 00107 3.24705565058120e+01, 00108 3.31442856005149e+01, 00109 3.37996924530920e+01, 00110 3.44377798564689e+01, 00111 3.50594680730467e+01, 00112 3.56656038766170e+01, 00113 3.62569683628670e+01, 00114 3.68342837279018e+01, 00115 3.73982191769817e+01, 00116 3.79493960962713e+01, 00117 3.84883925970040e+01, 00118 3.90157475227212e+01, 00119 3.95319639951220e+01, 00120 4.00375125617872e+01, 00121 4.05328339990172e+01, 00122 4.10183418147990e+01 00123 }; 00124 G4int i, A, Z; 00125 G4double cpi[nfissg+1]; 00126 G4double p, q, nubarg; 00127 G4double r; 00128 00129 /* 00130 No data is available for induced fission gamma number 00131 distributions. Sample the negative binomial cumulative 00132 probability distribution. 00133 */ 00134 A = (G4int) (isotope-1000*((G4int)(isotope/1000))); 00135 Z = (G4int) ((isotope-A)/1000); 00136 nubarg = ((2.51-1.13e-5*std::pow(G4double(Z),2.)*std::sqrt(G4double(A)))*nubar+4.0) 00137 /(-1.33+119.6*std::pow(G4double(Z),1./3.)/G4double(A)); 00138 p = 1.*alphanegbin/(alphanegbin+nubarg); 00139 q = 1.-p; 00140 cpi[0] = std::exp(logcoeff[0]+26.*std::log(p)); 00141 for (i=1; i<=nfissg; i++) cpi[i] = cpi[i-1] + std::exp(logcoeff[i]+26.*std::log(p)+i*std::log(q)); 00142 for (i=0; i<=nfissg; i++) cpi[i] = cpi[i]/cpi[nfissg-1]; 00143 00144 r=fisslibrng(); 00145 00146 for(i=0; i<=nfissg; i++) if (r <= cpi[i]) return i; 00147 00148 // 00149 // Fall through 00150 // 00151 00152 G4cout << " SmpNugDist: random number " << r << " out of range " << G4endl; 00153 return -1; 00154 00155 }