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Geant4/examples/extended/medical/fanoCavity2/src/MyMollerBhabhaModel.cc

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Differences between /examples/extended/medical/fanoCavity2/src/MyMollerBhabhaModel.cc (Version 11.3.0) and /examples/extended/medical/fanoCavity2/src/MyMollerBhabhaModel.cc (Version 9.4.p2)


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 26 /// \file medical/fanoCavity2/src/MyMollerBhab <<  26 // $Id: MyMollerBhabhaModel.cc,v 1.1 2007-10-15 16:20:23 maire Exp $
 27 /// \brief Implementation of the MyMollerBhabh <<  27 // GEANT4 tag $Name: geant4-09-04-patch-02 $
 28 //                                             << 
 29 //                                                 28 //
 30 //....oooOO0OOooo........oooOO0OOooo........oo     29 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 31 //....oooOO0OOooo........oooOO0OOooo........oo     30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32                                                    31 
 33 #include "MyMollerBhabhaModel.hh"                  32 #include "MyMollerBhabhaModel.hh"
 34                                                    33 
 35 #include "G4PhysicalConstants.hh"              << 
 36 #include "G4SystemOfUnits.hh"                  << 
 37                                                << 
 38 //....oooOO0OOooo........oooOO0OOooo........oo     34 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 39                                                    35 
 40 using namespace std;                               36 using namespace std;
 41                                                    37 
 42 MyMollerBhabhaModel::MyMollerBhabhaModel(const <<  38 MyMollerBhabhaModel::MyMollerBhabhaModel(const G4ParticleDefinition* p,
 43   : G4MollerBhabhaModel(p, nam)                <<  39                                          const G4String& nam)
                                                   >>  40   : G4MollerBhabhaModel(p,nam)
 44 {}                                                 41 {}
 45                                                    42 
 46 //....oooOO0OOooo........oooOO0OOooo........oo     43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 47                                                    44 
 48 MyMollerBhabhaModel::~MyMollerBhabhaModel() {} <<  45 MyMollerBhabhaModel::~MyMollerBhabhaModel()
                                                   >>  46 {}
 49                                                    47 
 50 //....oooOO0OOooo........oooOO0OOooo........oo     48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 51                                                    49 
 52 G4double MyMollerBhabhaModel::ComputeDEDXPerVo <<  50 G4double MyMollerBhabhaModel::ComputeDEDXPerVolume(
 53                                                <<  51             const G4Material* material,
 54                                                <<  52                                           const G4ParticleDefinition* p,
                                                   >>  53                                                 G4double kineticEnergy,
                                                   >>  54                                                 G4double cutEnergy)
 55 {                                                  55 {
 56   if (!particle) SetParticle(p);               <<  56   if(!particle) SetParticle(p);
 57   // calculate the dE/dx due to the ionization     57   // calculate the dE/dx due to the ionization by Seltzer-Berger formula
 58                                                <<  58   
 59   G4double electronDensity = material->GetElec     59   G4double electronDensity = material->GetElectronDensity();
 60   G4double Zeff = electronDensity / material-> <<  60   G4double Zeff  = electronDensity/material->GetTotNbOfAtomsPerVolume();
 61   G4double th = 0.25 * sqrt(Zeff) * keV;       <<  61   G4double th    = 0.25*sqrt(Zeff)*keV;
 62   G4double tkin = kineticEnergy;               <<  62   G4double tkin  = kineticEnergy;
 63   G4bool lowEnergy = false;                    <<  63   G4bool   lowEnergy = false;
 64   if (kineticEnergy < th) {                        64   if (kineticEnergy < th) {
 65     tkin = th;                                     65     tkin = th;
 66     lowEnergy = true;                              66     lowEnergy = true;
 67   }                                                67   }
 68   G4double tau = tkin / electron_mass_c2;      <<  68   G4double tau   = tkin/electron_mass_c2;
 69   G4double gam = tau + 1.0;                    <<  69   G4double gam   = tau + 1.0;
 70   G4double gamma2 = gam * gam;                 <<  70   G4double gamma2= gam*gam;
 71   G4double beta2 = 1. - 1. / gamma2;           <<  71   G4double beta2 = 1. - 1./gamma2;
 72   // G4double bg2   = beta2*gamma2;            <<  72   //G4double bg2   = beta2*gamma2;
 73                                                <<  73 
 74   G4double eexc = material->GetIonisation()->G <<  74   G4double eexc  = material->GetIonisation()->GetMeanExcitationEnergy();
 75   eexc /= electron_mass_c2;                    <<  75   eexc          /= electron_mass_c2;
 76   G4double eexc2 = eexc * eexc;                <<  76   G4double eexc2 = eexc*eexc; 
 77                                                    77 
 78   G4double d = min(cutEnergy, MaxSecondaryEner <<  78   G4double d = min(cutEnergy, MaxSecondaryEnergy(p, tkin))/electron_mass_c2;
 79   G4double dedx;                                   79   G4double dedx;
 80                                                    80 
 81   // electron                                      81   // electron
 82   if (isElectron) {                                82   if (isElectron) {
 83     dedx = log(2.0 * (tau + 2.0) / eexc2) - 1. << 
 84            + (0.5 * d * d + (2.0 * tau + 1.) * << 
 85                                                    83 
 86     // positron                                <<  84     dedx = log(2.0*(tau + 2.0)/eexc2) - 1.0 - beta2
 87   }                                            <<  85          + log((tau-d)*d) + tau/(tau-d)
 88   else {                                       <<  86          + (0.5*d*d + (2.0*tau + 1.)*log(1. - d/tau))/gamma2;
 89     G4double d2 = d * d * 0.5;                 <<  87    
 90     G4double d3 = d2 * d / 1.5;                <<  88   //positron
 91     G4double d4 = d3 * d * 3.75;               <<  89   } else {
 92     G4double y = 1.0 / (1.0 + gam);            <<  90 
 93     dedx =                                     <<  91     G4double d2 = d*d*0.5;
 94       log(2.0 * (tau + 2.0) / eexc2) + log(tau <<  92     G4double d3 = d2*d/1.5;
 95       - beta2 * (tau + 2.0 * d - y * (3.0 * d2 <<  93     G4double d4 = d3*d*3.75;
 96   }                                            <<  94     G4double y  = 1.0/(1.0 + gam);
 97                                                <<  95     dedx = log(2.0*(tau + 2.0)/eexc2) + log(tau*d)
 98   // do not apply density correction           <<  96          - beta2*(tau + 2.0*d - y*(3.0*d2 
 99   // G4double cden  = material->GetIonisation( <<  97          + y*(d - d3 + y*(d2 - tau*d3 + d4))))/tau;
100   // G4double mden  = material->GetIonisation( <<  98   } 
101   // G4double aden  = material->GetIonisation( <<  99 
102   // G4double x0den = material->GetIonisation( << 100   //do not apply density correction 
103   // G4double x1den = material->GetIonisation( << 101   //G4double cden  = material->GetIonisation()->GetCdensity();
104   // G4double x     = log(bg2)/twoln10;        << 102   //G4double mden  = material->GetIonisation()->GetMdensity();
105                                                << 103   //G4double aden  = material->GetIonisation()->GetAdensity();
106   // if (x >= x0den) {                         << 104   //G4double x0den = material->GetIonisation()->GetX0density();
107   //   dedx -= twoln10*x - cden;               << 105   //G4double x1den = material->GetIonisation()->GetX1density();
108   //   if (x < x1den) dedx -= aden*pow(x1den-x << 106   //G4double x     = log(bg2)/twoln10;
109   // }                                         << 107   
                                                   >> 108   //if (x >= x0den) {
                                                   >> 109   //  dedx -= twoln10*x - cden;
                                                   >> 110   //  if (x < x1den) dedx -= aden*pow(x1den-x, mden);
                                                   >> 111   //} 
110                                                   112 
111   // now you can compute the total ionization     113   // now you can compute the total ionization loss
112   dedx *= twopi_mc2_rcl2 * electronDensity / b << 114   dedx *= twopi_mc2_rcl2*electronDensity/beta2;
113   if (dedx < 0.0) dedx = 0.0;                     115   if (dedx < 0.0) dedx = 0.0;
114                                                   116 
115   // lowenergy extrapolation                      117   // lowenergy extrapolation
116                                                   118 
117   if (lowEnergy) {                                119   if (lowEnergy) {
118     if (kineticEnergy >= lowLimit)             << 120 
119       dedx *= sqrt(tkin / kineticEnergy);      << 121     if (kineticEnergy >= lowLimit) dedx *= sqrt(tkin/kineticEnergy);
120     else                                       << 122     else                           dedx *= sqrt(tkin*kineticEnergy)/lowLimit;
121       dedx *= sqrt(tkin * kineticEnergy) / low << 123 
122   }                                               124   }
123   return dedx;                                    125   return dedx;
124 }                                                 126 }
125                                                   127 
126 //....oooOO0OOooo........oooOO0OOooo........oo    128 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
127                                                   129