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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: G4PhotoElectricAngularGenera 32 // File name: G4PhotoElectricAngularGeneratorSauterGavrila
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 #include "G4PhotoElectricAngularGeneratorSaute 50 #include "G4PhotoElectricAngularGeneratorSauterGavrila.hh"
51 #include "G4PhysicalConstants.hh" 51 #include "G4PhysicalConstants.hh"
52 #include "Randomize.hh" 52 #include "Randomize.hh"
53 53
54 // ------------------------------------------- <<
55 G4PhotoElectricAngularGeneratorSauterGavrila:: 54 G4PhotoElectricAngularGeneratorSauterGavrila::G4PhotoElectricAngularGeneratorSauterGavrila():
56 G4VEmAngularDistribution("AngularGenSauterGa 55 G4VEmAngularDistribution("AngularGenSauterGavrilaLowE")
57 {} 56 {}
58 57
59 // ------------------------------------------- <<
60 <<
61 G4PhotoElectricAngularGeneratorSauterGavrila:: 58 G4PhotoElectricAngularGeneratorSauterGavrila::~G4PhotoElectricAngularGeneratorSauterGavrila()
62 {} 59 {}
63 60
64 // ------------------------------------------- <<
65 <<
66 G4ThreeVector& 61 G4ThreeVector&
67 G4PhotoElectricAngularGeneratorSauterGavrila:: 62 G4PhotoElectricAngularGeneratorSauterGavrila::SampleDirection(
68 const G4DynamicPartic 63 const G4DynamicParticle* dp,
69 G4double, G4int, cons 64 G4double, G4int, const G4Material*)
70 { 65 {
71 66
72 // Compute Theta distribution of the emitted 67 // Compute Theta distribution of the emitted electron, with respect to the
73 // incident Gamma. 68 // incident Gamma.
74 // The Sauter-Gavrila distribution for the K 69 // The Sauter-Gavrila distribution for the K-shell is used.
>> 70
75 G4double costeta = 1.; 71 G4double costeta = 1.;
76 G4double Phi = twopi * G4UniformRand(); 72 G4double Phi = twopi * G4UniformRand();
77 G4double cosphi = std::cos(Phi); 73 G4double cosphi = std::cos(Phi);
78 G4double sinphi = std::sin(Phi); 74 G4double sinphi = std::sin(Phi);
79 G4double sinteta = 0; 75 G4double sinteta = 0;
80 G4double gamma = 1. + dp->GetKineticEnergy 76 G4double gamma = 1. + dp->GetKineticEnergy()/electron_mass_c2;
81 77
82 if (gamma > 5.) { 78 if (gamma > 5.) {
83 fLocalDirection = dp->GetMomentumDirection 79 fLocalDirection = dp->GetMomentumDirection();
84 return fLocalDirection; 80 return fLocalDirection;
85 // Bugzilla 1120 81 // Bugzilla 1120
86 // SI on 05/09/2010 as suggested by JG 04/ 82 // SI on 05/09/2010 as suggested by JG 04/09/10
87 } 83 }
88 84
89 G4double beta = std::sqrt((gamma - 1)*(gamm 85 G4double beta = std::sqrt((gamma - 1)*(gamma + 1))/gamma;
90 G4double b = 0.5*gamma*(gamma - 1)*(gamm 86 G4double b = 0.5*gamma*(gamma - 1)*(gamma - 2);
91 87
92 G4double rndm,term,greject,grejsup; 88 G4double rndm,term,greject,grejsup;
93 if (gamma < 2.) grejsup = gamma*gamma*(1.+b- 89 if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b);
94 else grejsup = gamma*gamma*(1.+b+ 90 else grejsup = gamma*gamma*(1.+b+beta*b);
95 91
96 do { rndm = 1.-2*G4UniformRand(); 92 do { rndm = 1.-2*G4UniformRand();
97 costeta = (rndm+beta)/(rndm*beta+1.); 93 costeta = (rndm+beta)/(rndm*beta+1.);
98 term = 1.-beta*costeta; 94 term = 1.-beta*costeta;
99 greject = (1.-costeta*costeta)*(1.+b*te 95 greject = (1.-costeta*costeta)*(1.+b*term)/(term*term);
100 } while(greject < G4UniformRand()*grejsup); 96 } while(greject < G4UniformRand()*grejsup);
101 97
102 sinteta = std::sqrt((1 - costeta)*(1 + coste 98 sinteta = std::sqrt((1 - costeta)*(1 + costeta));
103 fLocalDirection.set(sinteta*cosphi, sinteta* 99 fLocalDirection.set(sinteta*cosphi, sinteta*sinphi, costeta);
104 fLocalDirection.rotateUz(dp->GetMomentumDire 100 fLocalDirection.rotateUz(dp->GetMomentumDirection());
105 return fLocalDirection; 101 return fLocalDirection;
106 } 102 }
107 <<
108 // ------------------------------------------- <<
109 103
110 void G4PhotoElectricAngularGeneratorSauterGavr 104 void G4PhotoElectricAngularGeneratorSauterGavrila::PrintGeneratorInformation() const
111 { 105 {
112 G4cout << "\n" << G4endl; 106 G4cout << "\n" << G4endl;
113 G4cout << "" << G4endl; 107 G4cout << "" << G4endl;
114 G4cout << "Re-implementation of the photolec 108 G4cout << "Re-implementation of the photolectric angular distribution" << G4endl;
115 G4cout << "developed my M. Maire for the Sta 109 G4cout << "developed my M. Maire for the Standard EM Physics G4PhotoElectricEffect" << G4endl;
116 G4cout << "It computes the theta distributio 110 G4cout << "It computes the theta distribution of the emitted electron, with respect to the" << G4endl;
117 G4cout << "incident Gamma, using the Sauter- 111 G4cout << "incident Gamma, using the Sauter-Gavrila distribution for the K-shell\n" << G4endl;
118 } 112 }
119 113