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25 // 25 //
26 #include "G4AngularDistributionPP.hh" 26 #include "G4AngularDistributionPP.hh"
27 #include "G4PhysicalConstants.hh" 27 #include "G4PhysicalConstants.hh"
28 #include "G4SystemOfUnits.hh" 28 #include "G4SystemOfUnits.hh"
29 #include "Randomize.hh" 29 #include "Randomize.hh"
30 #include "G4ios.hh" 30 #include "G4ios.hh"
31 31
32 // Initialization of static data arrays: 32 // Initialization of static data arrays:
33 #include "G4AngularDistributionPPData.hh" 33 #include "G4AngularDistributionPPData.hh"
34 #include "Randomize.hh" 34 #include "Randomize.hh"
35 35
36 36
37 G4double G4AngularDistributionPP::CosTheta(G4d 37 G4double G4AngularDistributionPP::CosTheta(G4double S, G4double m_1, G4double m_2) const
38 { 38 {
39 G4int verboseLevel=1; 39 G4int verboseLevel=1;
40 40
41 G4double ek= ((S - sqr(m_1) -sqr(m_2) )/(2 41 G4double ek= ((S - sqr(m_1) -sqr(m_2) )/(2*m_1) - m_1 )/GeV ; // kinetic energy in GeV
42 42
43 // Find energy bin 43 // Find energy bin
44 44
45 G4int je1 = 0; 45 G4int je1 = 0;
46 G4int je2 = NENERGY - 1; 46 G4int je2 = NENERGY - 1;
47 G4int iterationsLeft=2*NENERGY +1; <<
48 do { 47 do {
49 G4int midBin = (je1 + je2)/2; 48 G4int midBin = (je1 + je2)/2;
50 if (ek < elab[midBin]) 49 if (ek < elab[midBin])
51 je2 = midBin; 50 je2 = midBin;
52 else 51 else
53 je1 = midBin; 52 je1 = midBin;
54 } while ( (je2 - je1) > 1 && --iterationsL << 53 } while (je2 - je1 > 1);
55 if ( iterationsLeft <= 0 ) { <<
56 G4Exception("G4AngularDistributionPP", <<
57 "Problem with energy bin (elab) d <<
58 <<
59 } <<
60 // G4int j; 54 // G4int j;
61 //std::abs(ek-elab[je1]) < std::abs(ek-ela 55 //std::abs(ek-elab[je1]) < std::abs(ek-elab[je2]) ? j = je1 : j = je2;
62 G4double delab = elab[je2] - elab[je1]; 56 G4double delab = elab[je2] - elab[je1];
63 57
64 // Sample the angle 58 // Sample the angle
65 59
66 G4double sample = G4UniformRand(); << 60 G4float sample = G4UniformRand();
67 G4int ke1 = 0; 61 G4int ke1 = 0;
68 G4int ke2 = NANGLE - 1; 62 G4int ke2 = NANGLE - 1;
69 G4double dsig = sig[je2][0] - sig[je1][0]; 63 G4double dsig = sig[je2][0] - sig[je1][0];
70 G4double rc = dsig/delab; 64 G4double rc = dsig/delab;
71 G4double b = sig[je1][0] - rc*elab[je1]; 65 G4double b = sig[je1][0] - rc*elab[je1];
72 G4double sigint1 = rc*ek + b; 66 G4double sigint1 = rc*ek + b;
73 G4double sigint2 = 0.; 67 G4double sigint2 = 0.;
74 68
75 if (verboseLevel > 1) G4cout << "sample=" 69 if (verboseLevel > 1) G4cout << "sample=" << sample << G4endl
76 << ek << " " 70 << ek << " " << ke1 << " " << ke2 << " "
77 << sigint1 << 71 << sigint1 << " " << sigint2 << G4endl;
78 72
79 iterationsLeft= 2*NANGLE +1; << 73 do {
80 do { <<
81 G4int midBin = (ke1 + ke2)/2; 74 G4int midBin = (ke1 + ke2)/2;
82 dsig = sig[je2][midBin] - sig[je1][midBi 75 dsig = sig[je2][midBin] - sig[je1][midBin];
83 rc = dsig/delab; 76 rc = dsig/delab;
84 b = sig[je1][midBin] - rc*elab[je1]; 77 b = sig[je1][midBin] - rc*elab[je1];
85 G4double sigint = rc*ek + b; 78 G4double sigint = rc*ek + b;
86 if (sample < sigint) { 79 if (sample < sigint) {
87 ke2 = midBin; 80 ke2 = midBin;
88 sigint2 = sigint; 81 sigint2 = sigint;
89 } 82 }
90 else { 83 else {
91 ke1 = midBin; 84 ke1 = midBin;
92 sigint1 = sigint; 85 sigint1 = sigint;
93 } 86 }
94 if (verboseLevel > 1)G4cout << ke1 << " 87 if (verboseLevel > 1)G4cout << ke1 << " " << ke2 << " "
95 << sigint1 < 88 << sigint1 << " " << sigint2 << G4endl;
96 } while ( (ke2 - ke1) > 1 && --iterationsL << 89 } while (ke2 - ke1 > 1);
97 if ( iterationsLeft <= 0 ) { <<
98 G4Exception("G4AngularDistributionPP", <<
99 "Problem with angular distributio <<
100 } <<
101 90
102 // sigint1 and sigint2 should be recoverab 91 // sigint1 and sigint2 should be recoverable from above loop
103 92
104 // G4double dsig = sig[je2][ke1] - sig[ 93 // G4double dsig = sig[je2][ke1] - sig[je1][ke1];
105 // G4double rc = dsig/delab; 94 // G4double rc = dsig/delab;
106 // G4double b = sig[je1][ke1] - rc*elab 95 // G4double b = sig[je1][ke1] - rc*elab[je1];
107 // G4double sigint1 = rc*ek + b; 96 // G4double sigint1 = rc*ek + b;
108 97
109 // G4double dsig = sig[je2][ke2] - sig[ 98 // G4double dsig = sig[je2][ke2] - sig[je1][ke2];
110 // G4double rc = dsig/delab; 99 // G4double rc = dsig/delab;
111 // G4double b = sig[je1][ke2] - rc*elab 100 // G4double b = sig[je1][ke2] - rc*elab[je1];
112 // G4double sigint2 = rc*ek + b; 101 // G4double sigint2 = rc*ek + b;
113 102
114 dsig = sigint2 - sigint1; 103 dsig = sigint2 - sigint1;
115 rc = 1./dsig; 104 rc = 1./dsig;
116 b = ke1 - rc*sigint1; 105 b = ke1 - rc*sigint1;
117 G4double kint = rc*sample + b; 106 G4double kint = rc*sample + b;
118 G4double theta = (0.5 + kint)*pi/180.; 107 G4double theta = (0.5 + kint)*pi/180.;
119 108
120 // G4int k; 109 // G4int k;
121 //std::abs(sample-sig[j][ke1]) < std::abs( 110 //std::abs(sample-sig[j][ke1]) < std::abs(sample-sig[j][ke2]) ? k = ke1 : k = ke2;
122 // G4double theta = (0.5 + k)*pi/180.; 111 // G4double theta = (0.5 + k)*pi/180.;
123 112
124 if (verboseLevel > 1) { 113 if (verboseLevel > 1) {
125 G4cout << " energy bin " << je1 << " e 114 G4cout << " energy bin " << je1 << " energy=" << elab[je1] << G4endl;
126 G4cout << " angle bin " << kint << " a 115 G4cout << " angle bin " << kint << " angle=" << theta/degree << G4endl;
127 } 116 }
128 G4double costh= std::cos(theta); 117 G4double costh= std::cos(theta);
129 // G4cout << "scattering angle hpw "<<costh 118 // G4cout << "scattering angle hpw "<<costh<<" "<<s<<" "<<m1<<" "<<m2<<G4endl;
130 return costh; 119 return costh;
131 } 120 }
132 121
133 G4double G4AngularDistributionPP::Phi() const 122 G4double G4AngularDistributionPP::Phi() const
134 { 123 {
135 return twopi * G4UniformRand(); 124 return twopi * G4UniformRand();
136 } 125 }
137 126