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26 /// \file medical/fanoCavity2/src/MyMollerBhab 26 /// \file medical/fanoCavity2/src/MyMollerBhabhaModel.cc
27 /// \brief Implementation of the MyMollerBhabh 27 /// \brief Implementation of the MyMollerBhabhaModel class
28 // 28 //
>> 29 // $Id$
29 // 30 //
30 //....oooOO0OOooo........oooOO0OOooo........oo 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oo 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 33
33 #include "MyMollerBhabhaModel.hh" 34 #include "MyMollerBhabhaModel.hh"
34 35
35 #include "G4PhysicalConstants.hh" 36 #include "G4PhysicalConstants.hh"
36 #include "G4SystemOfUnits.hh" 37 #include "G4SystemOfUnits.hh"
37 38
38 //....oooOO0OOooo........oooOO0OOooo........oo 39 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
39 40
40 using namespace std; 41 using namespace std;
41 42
42 MyMollerBhabhaModel::MyMollerBhabhaModel(const << 43 MyMollerBhabhaModel::MyMollerBhabhaModel(const G4ParticleDefinition* p,
43 : G4MollerBhabhaModel(p, nam) << 44 const G4String& nam)
>> 45 : G4MollerBhabhaModel(p,nam)
44 {} 46 {}
45 47
46 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
47 49
48 MyMollerBhabhaModel::~MyMollerBhabhaModel() {} << 50 MyMollerBhabhaModel::~MyMollerBhabhaModel()
>> 51 {}
49 52
50 //....oooOO0OOooo........oooOO0OOooo........oo 53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
51 54
52 G4double MyMollerBhabhaModel::ComputeDEDXPerVo << 55 G4double MyMollerBhabhaModel::ComputeDEDXPerVolume(
53 << 56 const G4Material* material,
54 << 57 const G4ParticleDefinition* p,
>> 58 G4double kineticEnergy,
>> 59 G4double cutEnergy)
55 { 60 {
56 if (!particle) SetParticle(p); << 61 if(!particle) SetParticle(p);
57 // calculate the dE/dx due to the ionization 62 // calculate the dE/dx due to the ionization by Seltzer-Berger formula
58 << 63
59 G4double electronDensity = material->GetElec 64 G4double electronDensity = material->GetElectronDensity();
60 G4double Zeff = electronDensity / material-> << 65 G4double Zeff = electronDensity/material->GetTotNbOfAtomsPerVolume();
61 G4double th = 0.25 * sqrt(Zeff) * keV; << 66 G4double th = 0.25*sqrt(Zeff)*keV;
62 G4double tkin = kineticEnergy; << 67 G4double tkin = kineticEnergy;
63 G4bool lowEnergy = false; << 68 G4bool lowEnergy = false;
64 if (kineticEnergy < th) { 69 if (kineticEnergy < th) {
65 tkin = th; 70 tkin = th;
66 lowEnergy = true; 71 lowEnergy = true;
67 } 72 }
68 G4double tau = tkin / electron_mass_c2; << 73 G4double tau = tkin/electron_mass_c2;
69 G4double gam = tau + 1.0; << 74 G4double gam = tau + 1.0;
70 G4double gamma2 = gam * gam; << 75 G4double gamma2= gam*gam;
71 G4double beta2 = 1. - 1. / gamma2; << 76 G4double beta2 = 1. - 1./gamma2;
72 // G4double bg2 = beta2*gamma2; << 77 //G4double bg2 = beta2*gamma2;
73 << 78
74 G4double eexc = material->GetIonisation()->G << 79 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
75 eexc /= electron_mass_c2; << 80 eexc /= electron_mass_c2;
76 G4double eexc2 = eexc * eexc; << 81 G4double eexc2 = eexc*eexc;
77 82
78 G4double d = min(cutEnergy, MaxSecondaryEner << 83 G4double d = min(cutEnergy, MaxSecondaryEnergy(p, tkin))/electron_mass_c2;
79 G4double dedx; 84 G4double dedx;
80 85
81 // electron 86 // electron
82 if (isElectron) { 87 if (isElectron) {
83 dedx = log(2.0 * (tau + 2.0) / eexc2) - 1. <<
84 + (0.5 * d * d + (2.0 * tau + 1.) * <<
85 88
86 // positron << 89 dedx = log(2.0*(tau + 2.0)/eexc2) - 1.0 - beta2
87 } << 90 + log((tau-d)*d) + tau/(tau-d)
88 else { << 91 + (0.5*d*d + (2.0*tau + 1.)*log(1. - d/tau))/gamma2;
89 G4double d2 = d * d * 0.5; << 92
90 G4double d3 = d2 * d / 1.5; << 93 //positron
91 G4double d4 = d3 * d * 3.75; << 94 } else {
92 G4double y = 1.0 / (1.0 + gam); << 95
93 dedx = << 96 G4double d2 = d*d*0.5;
94 log(2.0 * (tau + 2.0) / eexc2) + log(tau << 97 G4double d3 = d2*d/1.5;
95 - beta2 * (tau + 2.0 * d - y * (3.0 * d2 << 98 G4double d4 = d3*d*3.75;
96 } << 99 G4double y = 1.0/(1.0 + gam);
97 << 100 dedx = log(2.0*(tau + 2.0)/eexc2) + log(tau*d)
98 // do not apply density correction << 101 - beta2*(tau + 2.0*d - y*(3.0*d2
99 // G4double cden = material->GetIonisation( << 102 + y*(d - d3 + y*(d2 - tau*d3 + d4))))/tau;
100 // G4double mden = material->GetIonisation( << 103 }
101 // G4double aden = material->GetIonisation( << 104
102 // G4double x0den = material->GetIonisation( << 105 //do not apply density correction
103 // G4double x1den = material->GetIonisation( << 106 //G4double cden = material->GetIonisation()->GetCdensity();
104 // G4double x = log(bg2)/twoln10; << 107 //G4double mden = material->GetIonisation()->GetMdensity();
105 << 108 //G4double aden = material->GetIonisation()->GetAdensity();
106 // if (x >= x0den) { << 109 //G4double x0den = material->GetIonisation()->GetX0density();
107 // dedx -= twoln10*x - cden; << 110 //G4double x1den = material->GetIonisation()->GetX1density();
108 // if (x < x1den) dedx -= aden*pow(x1den-x << 111 //G4double x = log(bg2)/twoln10;
109 // } << 112
>> 113 //if (x >= x0den) {
>> 114 // dedx -= twoln10*x - cden;
>> 115 // if (x < x1den) dedx -= aden*pow(x1den-x, mden);
>> 116 //}
110 117
111 // now you can compute the total ionization 118 // now you can compute the total ionization loss
112 dedx *= twopi_mc2_rcl2 * electronDensity / b << 119 dedx *= twopi_mc2_rcl2*electronDensity/beta2;
113 if (dedx < 0.0) dedx = 0.0; 120 if (dedx < 0.0) dedx = 0.0;
114 121
115 // lowenergy extrapolation 122 // lowenergy extrapolation
116 123
117 if (lowEnergy) { 124 if (lowEnergy) {
118 if (kineticEnergy >= lowLimit) << 125
119 dedx *= sqrt(tkin / kineticEnergy); << 126 if (kineticEnergy >= lowLimit) dedx *= sqrt(tkin/kineticEnergy);
120 else << 127 else dedx *= sqrt(tkin*kineticEnergy)/lowLimit;
121 dedx *= sqrt(tkin * kineticEnergy) / low << 128
122 } 129 }
123 return dedx; 130 return dedx;
124 } 131 }
125 132
126 //....oooOO0OOooo........oooOO0OOooo........oo 133 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
127 134