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50 // 50 //
51 // Copyright (c) 2006 The Regents of the Unive 51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved. 52 // All rights reserved.
53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
54 // 54 //
55 // 55 //
>> 56 // $Id: G4SmpTerrell.cc 67966 2013-03-13 09:38:38Z gcosmo $
56 // 57 //
57 58
58 #include <cmath> 59 #include <cmath>
59 #include "G4Exp.hh" <<
60 #include "G4Log.hh" <<
61 #include "G4fissionEvent.hh" 60 #include "G4fissionEvent.hh"
62 61
63 #define TWOPI 6.283185307 62 #define TWOPI 6.283185307
64 #define SQRT2 1.414213562 63 #define SQRT2 1.414213562
65 #define BSHIFT -0.43287 64 #define BSHIFT -0.43287
66 #define WIDTH 1.079 65 #define WIDTH 1.079
67 66
68 G4double G4fissionEvent::G4SmpTerrell(G4double 67 G4double G4fissionEvent::G4SmpTerrell(G4double nubar) {
69 /* 68 /*
70 Description 69 Description
71 Sample Fission Number from Terrell's modif 70 Sample Fission Number from Terrell's modified Gaussian distribution
72 71
73 method uses Red Cullen's algoritm UCRL-TR- 72 method uses Red Cullen's algoritm UCRL-TR-222526
74 */ 73 */
75 74
76 /* 75 /*
77 Input 76 Input
78 nubar - average number of neutrons per 77 nubar - average number of neutrons per fission
79 Output 78 Output
80 G4SmpTerrell - sampled multiplicity 79 G4SmpTerrell - sampled multiplicity
81 80
82 */ 81 */
83 82
84 G4double width; 83 G4double width;
85 G4double temp1, temp2, expo, cshift; 84 G4double temp1, temp2, expo, cshift;
86 G4double rw, theta, sampleg; 85 G4double rw, theta, sampleg;
87 86
88 87
89 if (nubar < WIDTH) { 88 if (nubar < WIDTH) {
90 std::ostringstream o; 89 std::ostringstream o;
91 o << nubar; 90 o << nubar;
92 const std::string& errMsg = "fission nubar << 91 std::string errMsg = "fission nubar out of range, nubar=" + o.str();
93 G4fissionerr(6, "SmpTerrell", errMsg); 92 G4fissionerr(6, "SmpTerrell", errMsg);
94 } 93 }
95 94
96 width = SQRT2 * WIDTH; 95 width = SQRT2 * WIDTH;
97 temp1 = nubar + 0.5; 96 temp1 = nubar + 0.5;
98 temp2 = temp1/width; 97 temp2 = temp1/width;
99 temp2 *= temp2; 98 temp2 *= temp2;
100 expo = G4Exp(-temp2); << 99 expo = std::exp(-temp2);
101 cshift = temp1 + BSHIFT * WIDTH * expo/(1. - 100 cshift = temp1 + BSHIFT * WIDTH * expo/(1. - expo);
102 101
103 G4int icounter = 0; <<
104 G4int icounter_max = 1024; <<
105 do { 102 do {
106 rw = std::sqrt(-G4Log(fisslibrng())); << 103 rw = std::sqrt(-std::log(fisslibrng()));
107 theta = TWOPI * fisslibrng(); 104 theta = TWOPI * fisslibrng();
108 sampleg = width * rw * std::cos(theta) + c 105 sampleg = width * rw * std::cos(theta) + cshift;
109 icounter++; <<
110 if ( icounter > icounter_max ) { <<
111 G4cout << "Loop-counter exceeded the thr <<
112 break; <<
113 } <<
114 } while (sampleg < 0.0); 106 } while (sampleg < 0.0);
115 // Loop checking, 11.03.2015, T. Koi <<
116 107
117 return std::floor(sampleg); 108 return std::floor(sampleg);
118 } 109 }
119 110