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25 // 25 //
26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4RDPhotoElectricAngularGene 32 // File name: G4RDPhotoElectricAngularGeneratorSauterGavrila
33 // 33 //
34 // Creation date: 10 May 2004 34 // Creation date: 10 May 2004
35 // 35 //
36 // Modifications: 36 // Modifications:
37 // 10 May 2003 P. Rodrigues First imple 37 // 10 May 2003 P. Rodrigues First implementation acording with new design
38 // 38 //
39 // Class Description: 39 // Class Description:
40 // 40 //
41 // Concrete class for PhotoElectric Electron A 41 // Concrete class for PhotoElectric Electron Angular Distribution Generation
42 // This model is a re-implementation of the Ph 42 // This model is a re-implementation of the Photolectric angular distribution
43 // developed my M. Maire for the Standard EM P 43 // developed my M. Maire for the Standard EM Physics G4PhotoElectricEffect
44 // 44 //
45 // Class Description: End 45 // Class Description: End
46 // 46 //
47 // ------------------------------------------- 47 // -------------------------------------------------------------------
48 // 48 //
49 // 49 //
50 50
51 #include "G4RDPhotoElectricAngularGeneratorSau 51 #include "G4RDPhotoElectricAngularGeneratorSauterGavrila.hh"
52 #include "Randomize.hh" 52 #include "Randomize.hh"
53 #include "G4PhysicalConstants.hh" 53 #include "G4PhysicalConstants.hh"
54 54
55 // 55 //
56 56
57 G4RDPhotoElectricAngularGeneratorSauterGavrila 57 G4RDPhotoElectricAngularGeneratorSauterGavrila::G4RDPhotoElectricAngularGeneratorSauterGavrila(const G4String& name):G4RDVPhotoElectricAngularDistribution(name)
58 {;} 58 {;}
59 59
60 // 60 //
61 61
62 G4RDPhotoElectricAngularGeneratorSauterGavrila 62 G4RDPhotoElectricAngularGeneratorSauterGavrila::~G4RDPhotoElectricAngularGeneratorSauterGavrila()
63 {;} 63 {;}
64 64
65 // 65 //
66 66
67 G4ThreeVector G4RDPhotoElectricAngularGenerato 67 G4ThreeVector G4RDPhotoElectricAngularGeneratorSauterGavrila::GetPhotoElectronDirection(const G4ThreeVector& direction, const G4double eKineticEnergy, const G4ThreeVector&, const G4int) const
68 { 68 {
69 69
70 // Compute Theta distribution of the emitted 70 // Compute Theta distribution of the emitted electron, with respect to the
71 // incident Gamma. 71 // incident Gamma.
72 // The Sauter-Gavrila distribution for the K 72 // The Sauter-Gavrila distribution for the K-shell is used. (adapted from G4PhotoElectricEffect)
73 73
74 G4double costeta = 1.; 74 G4double costeta = 1.;
75 G4double Phi = twopi * G4UniformRand(); 75 G4double Phi = twopi * G4UniformRand();
76 G4double cosphi = std::cos(Phi); 76 G4double cosphi = std::cos(Phi);
77 G4double sinphi = std::sin(Phi); 77 G4double sinphi = std::sin(Phi);
78 G4double sinteta = 0; 78 G4double sinteta = 0;
79 G4double gamma = 1. + eKineticEnergy/elect 79 G4double gamma = 1. + eKineticEnergy/electron_mass_c2;
80 80
81 if (gamma > 5.) { 81 if (gamma > 5.) {
82 G4ThreeVector direction (sinteta*cosphi, s 82 G4ThreeVector direction (sinteta*cosphi, sinteta*sinphi, costeta);
83 return direction; 83 return direction;
84 } 84 }
85 85
86 G4double beta = std::sqrt(gamma*gamma-1.)/g 86 G4double beta = std::sqrt(gamma*gamma-1.)/gamma;
87 G4double b = 0.5*gamma*(gamma-1.)*(gamma 87 G4double b = 0.5*gamma*(gamma-1.)*(gamma-2);
88 88
89 G4double rndm,term,greject,grejsup; 89 G4double rndm,term,greject,grejsup;
90 if (gamma < 2.) grejsup = gamma*gamma*(1.+b- 90 if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b);
91 else grejsup = gamma*gamma*(1.+b+ 91 else grejsup = gamma*gamma*(1.+b+beta*b);
92 92
93 do { rndm = 1.-2*G4UniformRand(); 93 do { rndm = 1.-2*G4UniformRand();
94 costeta = (rndm+beta)/(rndm*beta+1.); 94 costeta = (rndm+beta)/(rndm*beta+1.);
95 term = 1.-beta*costeta; 95 term = 1.-beta*costeta;
96 greject = (1.-costeta*costeta)*(1.+b*te 96 greject = (1.-costeta*costeta)*(1.+b*term)/(term*term);
97 } while(greject < G4UniformRand()*grejsup); 97 } while(greject < G4UniformRand()*grejsup);
98 98
99 99
100 sinteta = std::sqrt(1.-costeta*costeta); 100 sinteta = std::sqrt(1.-costeta*costeta);
101 G4ThreeVector photoelectrondirection (sintet 101 G4ThreeVector photoelectrondirection (sinteta*cosphi, sinteta*sinphi, costeta);
102 photoelectrondirection.rotateUz(direction); 102 photoelectrondirection.rotateUz(direction);
103 return photoelectrondirection; 103 return photoelectrondirection;
104 } 104 }
105 105
106 // 106 //
107 107
108 void G4RDPhotoElectricAngularGeneratorSauterGa 108 void G4RDPhotoElectricAngularGeneratorSauterGavrila::PrintGeneratorInformation() const
109 { 109 {
110 G4cout << "\n" << G4endl; 110 G4cout << "\n" << G4endl;
111 G4cout << "" << G4endl; 111 G4cout << "" << G4endl;
112 G4cout << "Re-implementation of the photolec 112 G4cout << "Re-implementation of the photolectric angular distribution" << G4endl;
113 G4cout << "developed my M. Maire for the Sta 113 G4cout << "developed my M. Maire for the Standard EM Physics G4PhotoElectricEffect" << G4endl;
114 G4cout << "It computes the theta distributio 114 G4cout << "It computes the theta distribution of the emitted electron, with respect to the" << G4endl;
115 G4cout << "incident Gamma, using the Sauter- 115 G4cout << "incident Gamma, using the Sauter-Gavrila distribution for the K-shell\n" << G4endl;
116 } 116 }
117 117