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 "G4Exp.hh" 60 #include "G4Log.hh" 61 #include "G4fissionEvent.hh" 62 63 #define TWOPI 6.283185307 64 #define SQRT2 1.414213562 65 #define BSHIFT -0.43287 66 #define WIDTH 1.079 67 68 G4double G4fissionEvent::G4SmpTerrell(G4double 69 /* 70 Description 71 Sample Fission Number from Terrell's modif 72 73 method uses Red Cullen's algoritm UCRL-TR- 74 */ 75 76 /* 77 Input 78 nubar - average number of neutrons per 79 Output 80 G4SmpTerrell - sampled multiplicity 81 82 */ 83 84 G4double width; 85 G4double temp1, temp2, expo, cshift; 86 G4double rw, theta, sampleg; 87 88 89 if (nubar < WIDTH) { 90 std::ostringstream o; 91 o << nubar; 92 const std::string& errMsg = "fission nubar 93 G4fissionerr(6, "SmpTerrell", errMsg); 94 } 95 96 width = SQRT2 * WIDTH; 97 temp1 = nubar + 0.5; 98 temp2 = temp1/width; 99 temp2 *= temp2; 100 expo = G4Exp(-temp2); 101 cshift = temp1 + BSHIFT * WIDTH * expo/(1. - 102 103 G4int icounter = 0; 104 G4int icounter_max = 1024; 105 do { 106 rw = std::sqrt(-G4Log(fisslibrng())); 107 theta = TWOPI * fisslibrng(); 108 sampleg = width * rw * std::cos(theta) + c 109 icounter++; 110 if ( icounter > icounter_max ) { 111 G4cout << "Loop-counter exceeded the thr 112 break; 113 } 114 } while (sampleg < 0.0); 115 // Loop checking, 11.03.2015, T. Koi 116 117 return std::floor(sampleg); 118 } 119