| Geant4 Cross Reference |
1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 #include "G4AngularDistributionNP.hh" 23 #include "G4AngularDistributionNP.hh"
27 #include "G4PhysicalConstants.hh" <<
28 #include "G4SystemOfUnits.hh" <<
29 #include "Randomize.hh" 24 #include "Randomize.hh"
30 #include "G4ios.hh" 25 #include "G4ios.hh"
31 26
32 // Initialization of static data arrays: 27 // Initialization of static data arrays:
33 #include "G4AngularDistributionNPData.hh" 28 #include "G4AngularDistributionNPData.hh"
34 #include "Randomize.hh" 29 #include "Randomize.hh"
35 30
36 31
37 G4double G4AngularDistributionNP::CosTheta(G4d << 32 G4double G4AngularDistributionNP::CosTheta(G4double s, G4double m1, G4double m2) const
38 { 33 {
39 G4int verboseLevel=1; 34 G4int verboseLevel=1;
40 35
41 G4double ek= ((S - sqr(m_1) -sqr(m_2) )/(2 << 36 G4double ek= ((s - sqr(m1) -sqr(m2) )/(2*m1) - m1 )/GeV ; // kinetic energy in GeV
42 37
43 // Find energy bin 38 // Find energy bin
44 39
45 G4int je1 = 0; 40 G4int je1 = 0;
46 G4int je2 = NENERGY - 1; 41 G4int je2 = NENERGY - 1;
47 G4int iterationsLeft=2*NENERGY +1; <<
48 do { 42 do {
49 G4int midBin = (je1 + je2)/2; 43 G4int midBin = (je1 + je2)/2;
50 if (ek < elab[midBin]) 44 if (ek < elab[midBin])
51 je2 = midBin; 45 je2 = midBin;
52 else 46 else
53 je1 = midBin; 47 je1 = midBin;
54 } while ( (je2 - je1) > 1 && --iterationsL << 48 } while (je2 - je1 > 1);
55 if ( iterationsLeft <= 0 ) { <<
56 G4Exception("G4AngularDistributionNP", <<
57 "Problem with energy bin (elab) d <<
58 <<
59 } <<
60 // G4int j; 49 // G4int j;
61 //std::abs(ek-elab[je1]) < std::abs(ek-ela << 50 //abs(ek-elab[je1]) < abs(ek-elab[je2]) ? j = je1 : j = je2;
62 G4double delab = elab[je2] - elab[je1]; 51 G4double delab = elab[je2] - elab[je1];
63 52
64 // Sample the angle 53 // Sample the angle
65 54
66 G4double sample = G4UniformRand(); << 55 G4float sample = G4UniformRand();
67 G4int ke1 = 0; 56 G4int ke1 = 0;
68 G4int ke2 = NANGLE - 1; 57 G4int ke2 = NANGLE - 1;
69 G4double dsig = sig[je2][0] - sig[je1][0]; 58 G4double dsig = sig[je2][0] - sig[je1][0];
70 G4double rc = dsig/delab; 59 G4double rc = dsig/delab;
71 G4double b = sig[je1][0] - rc*elab[je1]; 60 G4double b = sig[je1][0] - rc*elab[je1];
72 G4double sigint1 = rc*ek + b; 61 G4double sigint1 = rc*ek + b;
73 G4double sigint2 = 0.; 62 G4double sigint2 = 0.;
74 63
75 if (verboseLevel > 1) G4cout << "sample=" 64 if (verboseLevel > 1) G4cout << "sample=" << sample << G4endl
76 << ek << " " 65 << ek << " " << ke1 << " " << ke2 << " "
77 << sigint1 << 66 << sigint1 << " " << sigint2 << G4endl;
78 iterationsLeft= 2*NANGLE +1; << 67
79 do { 68 do {
80 G4int midBin = (ke1 + ke2)/2; 69 G4int midBin = (ke1 + ke2)/2;
81 dsig = sig[je2][midBin] - sig[je1][midBi 70 dsig = sig[je2][midBin] - sig[je1][midBin];
82 rc = dsig/delab; 71 rc = dsig/delab;
83 b = sig[je1][midBin] - rc*elab[je1]; 72 b = sig[je1][midBin] - rc*elab[je1];
84 G4double sigint = rc*ek + b; 73 G4double sigint = rc*ek + b;
85 if (sample < sigint) { 74 if (sample < sigint) {
86 ke2 = midBin; 75 ke2 = midBin;
87 sigint2 = sigint; 76 sigint2 = sigint;
88 } 77 }
89 else { 78 else {
90 ke1 = midBin; 79 ke1 = midBin;
91 sigint1 = sigint; 80 sigint1 = sigint;
92 } 81 }
93 if (verboseLevel > 1)G4cout << ke1 << " 82 if (verboseLevel > 1)G4cout << ke1 << " " << ke2 << " "
94 << sigint1 < 83 << sigint1 << " " << sigint2 << G4endl;
95 } while ( (ke2 - ke1) > 1 && --iterationsL << 84 } while (ke2 - ke1 > 1);
96 if ( iterationsLeft <= 0 ) { <<
97 G4Exception("G4AngularDistributionNP", <<
98 "Problem with angular distributio <<
99 } <<
100 85
101 // sigint1 and sigint2 should be recoverab 86 // sigint1 and sigint2 should be recoverable from above loop
102 87
103 // G4double dsig = sig[je2][ke1] - sig[ 88 // G4double dsig = sig[je2][ke1] - sig[je1][ke1];
104 // G4double rc = dsig/delab; 89 // G4double rc = dsig/delab;
105 // G4double b = sig[je1][ke1] - rc*elab 90 // G4double b = sig[je1][ke1] - rc*elab[je1];
106 // G4double sigint1 = rc*ek + b; 91 // G4double sigint1 = rc*ek + b;
107 92
108 // G4double dsig = sig[je2][ke2] - sig[ 93 // G4double dsig = sig[je2][ke2] - sig[je1][ke2];
109 // G4double rc = dsig/delab; 94 // G4double rc = dsig/delab;
110 // G4double b = sig[je1][ke2] - rc*elab 95 // G4double b = sig[je1][ke2] - rc*elab[je1];
111 // G4double sigint2 = rc*ek + b; 96 // G4double sigint2 = rc*ek + b;
112 97
113 dsig = sigint2 - sigint1; 98 dsig = sigint2 - sigint1;
114 rc = 1./dsig; 99 rc = 1./dsig;
115 b = ke1 - rc*sigint1; 100 b = ke1 - rc*sigint1;
116 G4double kint = rc*sample + b; 101 G4double kint = rc*sample + b;
117 G4double theta = (0.5 + kint)*pi/180.; 102 G4double theta = (0.5 + kint)*pi/180.;
118 103
119 // G4int k; 104 // G4int k;
120 //std::abs(sample-sig[j][ke1]) < std::abs( << 105 //abs(sample-sig[j][ke1]) < abs(sample-sig[j][ke2]) ? k = ke1 : k = ke2;
121 // G4double theta = (0.5 + k)*pi/180.; 106 // G4double theta = (0.5 + k)*pi/180.;
122 107
123 if (verboseLevel > 1) { 108 if (verboseLevel > 1) {
124 G4cout << " energy bin " << je1 << " e 109 G4cout << " energy bin " << je1 << " energy=" << elab[je1] << G4endl;
125 G4cout << " angle bin " << kint << " a 110 G4cout << " angle bin " << kint << " angle=" << theta/degree << G4endl;
126 } 111 }
127 G4double costh= std::cos(theta); << 112 G4double costh= cos(theta);
128 return costh; 113 return costh;
129 } 114 }
130 115
131 G4double G4AngularDistributionNP::Phi() const 116 G4double G4AngularDistributionNP::Phi() const
132 { 117 {
133 return twopi * G4UniformRand(); 118 return twopi * G4UniformRand();
134 } 119 }
135 120