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Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 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