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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: G4SmpNuDistDataU233_235.cc 69860 2013-05-16 14:39:02Z gcosmo $ 00057 // 00058 00059 #include <cmath> 00060 #include "G4fissionEvent.hh" 00061 00062 int G4fissionEvent::G4SmpNuDistDataU233_235(G4double nubar) { 00063 00064 /* 00065 Description 00066 Sample Number of Neutrons from fission in U-233 and U-235 using 00067 Zucker and Holden's tabulated data for U-235 00068 The P(nu) distribution is given as a function of the average 00069 number of neutrons from fission, based on interpolation of the 00070 U-235 data from Zucker and Holden. 00071 */ 00072 00073 /* 00074 Input 00075 nubar - average number of neutrons per fission 00076 Output 00077 G4SmpNuDistDataU233_235 - sampled multiplicity 00078 00079 */ 00080 00081 G4double pnu[8], cpnu, sum; 00082 G4double r; 00083 00084 /* 00085 Check if nubar is within the range of experimental values 00086 */ 00087 if(nubar >= 2.25 && nubar <= 4.0) { 00088 /* 00089 Use Zucker and Holden Data 00090 */ 00091 if(nubar <= 2.8738) pnu[0]=-9.279554e-02*std::pow(nubar,3)+8.036687e-01*std::pow(nubar,2)-2.342684*nubar+2.309035; 00092 else if(nubar > 2.8738 && nubar <= 3.4272) pnu[0]=1.50072e-2*std::pow(nubar,2)-1.109109e-1*nubar+2.063133e-1; 00093 else pnu[0]=1.498897e+3*std::exp(-3.883864*nubar); 00094 00095 if(nubar <= 3.2316) pnu[1]=3.531126e-2*std::pow(nubar,3)-2.787213e-1*std::pow(nubar,2)+5.824072e-1*nubar-1.067136e-1; 00096 else pnu[1]=6.574492e-2*std::pow(nubar,2)-5.425741e-1*nubar+1.123199; 00097 00098 pnu[2]=1.274643e-2*std::pow(nubar,3)-1.387954e-1*std::pow(nubar,2)+3.264669e-1*nubar+1.77148e-1; 00099 00100 pnu[3]=5.473738e-2*std::pow(nubar,5)-8.835826e-1*std::pow(nubar,4)+5.657201*std::pow(nubar,3)-1.802669e+1*std::pow(nubar,2)+2.867937e+1*nubar-1.794296e+1; 00101 00102 pnu[4]=-3.591076e-2*std::pow(nubar,3)+3.092624e-1*std::pow(nubar,2)-7.184805e-1*nubar+5.649400e-1; 00103 00104 if(nubar <= 2.8738) pnu[5]=1.699374e-2*std::pow(nubar,2)-1.069558e-3*nubar-6.981430e-2; 00105 else pnu[5]=2.100175e-2*std::pow(nubar,3)-1.705788e-1*std::pow(nubar,2)+5.575467e-1*nubar-6.245873e-1; 00106 00107 if(nubar <= 3.0387) pnu[6]=9.431919e-7*std::pow(nubar,8.958848); 00108 else pnu[6]=4.322428e-3*std::pow(nubar,3)-2.094790e-2*std::pow(nubar,2)+4.449671e-2*nubar-4.435987e-2; 00109 00110 pnu[7]=5.689084e-3*std::pow(nubar,4)-6.591895e-2*std::pow(nubar,3)+2.886861e-1*std::pow(nubar,2)-5.588146e-1*nubar+4.009166e-1; 00111 00112 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]; 00113 00114 pnu[0]=pnu[0]/sum; 00115 pnu[1]=pnu[1]/sum; 00116 pnu[2]=pnu[2]/sum; 00117 pnu[3]=pnu[3]/sum; 00118 pnu[4]=pnu[4]/sum; 00119 pnu[5]=pnu[5]/sum; 00120 pnu[6]=pnu[6]/sum; 00121 pnu[7]=pnu[7]/sum; 00122 00123 r=fisslibrng(); 00124 00125 if(r <= pnu[0]) return (int) 0; 00126 00127 cpnu=pnu[0]+pnu[1]; 00128 if(r <= cpnu) return (int) 1; 00129 00130 cpnu=cpnu+pnu[2]; 00131 if(r <= cpnu) return (int) 2; 00132 00133 cpnu=cpnu+pnu[3]; 00134 if(r <= cpnu) return (int) 3; 00135 00136 cpnu=cpnu+pnu[4]; 00137 if(r <= cpnu) return (int) 4; 00138 00139 cpnu=cpnu+pnu[5]; 00140 if(r <= cpnu) return (int) 5; 00141 00142 cpnu=cpnu+pnu[6]; 00143 if(r <= cpnu) return (int) 6; 00144 else return (int) 7; 00145 } else { 00146 /* 00147 Use Terrell's formula 00148 */ 00149 return (int) G4SmpTerrell(nubar); 00150 } 00151 }