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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: G4SmpNuDistDataU232_234_236_238.cc 69860 2013-05-16 14:39:02Z gcosmo $ 00057 // 00058 00059 #include <cmath> 00060 #include "G4fissionEvent.hh" 00061 00062 G4int G4fissionEvent::G4SmpNuDistDataU232_234_236_238(G4double nubar) { 00063 00064 /* 00065 Description 00066 Sample Number of Neutrons from fission in U-232, U-234, U-236 00067 and U-238 using Zucker and Holden's tabulated data for U-238 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-238 data from Zucker and Holden. 00071 */ 00072 00073 /* 00074 Input 00075 nubar - average number of neutrons per fission 00076 Output 00077 G4SmpNuDistDataU232_234_236_238 - sampled multiplicity 00078 00079 */ 00080 00081 G4double pnu[9], 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 <= 3.80) { 00088 /* 00089 Use Zucker and Holden Data 00090 */ 00091 pnu[0]=-7.705432e-3*std::pow(nubar,3)+8.904671e-2*std::pow(nubar,2)-3.488123e-1*nubar+4.627291e-1; 00092 pnu[1]=-2.879938e-2*std::pow(nubar,3)+3.629189e-1*std::pow(nubar,2)-1.545284*nubar+2.229503; 00093 pnu[2]=6.543684e-2*std::pow(nubar,3)-6.673117e-1*std::pow(nubar,2)+2.087358*nubar-1.771396; 00094 pnu[3]=1.412971e-2*std::pow(nubar,3)-2.309842e-1*std::pow(nubar,2)+1.022451*nubar-1.032235; 00095 pnu[4]=-5.163167e-2*std::pow(nubar,3)+4.457516e-1*std::pow(nubar,2)-1.114981*nubar+9.484241e-1; 00096 pnu[5]=8.758841e-4*std::pow(nubar,3)+3.707461e-2*std::pow(nubar,2)-1.565149e-1*nubar+1.851039e-1; 00097 pnu[6]=-3.871089e-5*std::pow(nubar,3)+1.936524e-2*std::pow(nubar,2)-8.091057e-2*nubar+9.019871e-2; 00098 pnu[7]=3.945995e-3*std::pow(nubar,3)-2.697509e-2*std::pow(nubar,2)+6.237296e-2*nubar-4.820745e-2; 00099 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; 00100 00101 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8]; 00102 00103 pnu[0]=pnu[0]/sum; 00104 pnu[1]=pnu[1]/sum; 00105 pnu[2]=pnu[2]/sum; 00106 pnu[3]=pnu[3]/sum; 00107 pnu[4]=pnu[4]/sum; 00108 pnu[5]=pnu[5]/sum; 00109 pnu[6]=pnu[6]/sum; 00110 pnu[7]=pnu[7]/sum; 00111 pnu[8]=pnu[8]/sum; 00112 00113 r=fisslibrng(); 00114 00115 if(r <= pnu[0]) return 0; 00116 00117 cpnu=pnu[0]+pnu[1]; 00118 if(r <= cpnu) return 1; 00119 00120 cpnu=cpnu+pnu[2]; 00121 if(r <= cpnu) return 2; 00122 00123 cpnu=cpnu+pnu[3]; 00124 if(r <= cpnu) return 3; 00125 00126 cpnu=cpnu+pnu[4]; 00127 if(r <= cpnu) return 4; 00128 00129 cpnu=cpnu+pnu[5]; 00130 if(r <= cpnu) return 5; 00131 00132 cpnu=cpnu+pnu[6]; 00133 if(r <= cpnu) return 6; 00134 00135 cpnu=cpnu+pnu[7]; 00136 if(r <= cpnu) return 7; 00137 else return 8; 00138 00139 } else { 00140 /* 00141 Use Terrell's formula 00142 */ 00143 return (G4int) G4SmpTerrell(nubar); 00144 } 00145 }