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This commit is contained in:
Gabriele Cosmo
2016-06-09 14:55:03 +02:00
parent 216a75eeb1
commit fe73f43734
6714 changed files with 118229 additions and 68144 deletions
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source/processes/electromagnetic/standard/src/G4eeToTwoGammaModel.cc
+94 -61
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@@ -23,8 +23,8 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4eeToTwoGammaModel.cc,v 1.10 2006/06/29 19:53:55 gunter Exp $
// GEANT4 tag $Name: geant4-08-01 $
// $Id: G4eeToTwoGammaModel.cc,v 1.12 2006/10/20 08:59:50 vnivanch Exp $
// GEANT4 tag $Name: geant4-08-02 $
//
// -------------------------------------------------------------------
//
@@ -38,9 +38,11 @@
// Creation date: 02.08.2004
//
// Modifications:
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 18-04-05 Compute CrossSectionPerVolume (V.Ivantchenko)
// 08-04-05 Major optimisation of internal interfaces (V.Ivanchenko)
// 18-04-05 Compute CrossSectionPerVolume (V.Ivanchenko)
// 06-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
// 29-06-06 Fix problem for zero energy incident positron (V.Ivanchenko)
// 20-10-06 Add theGamma as a member (V.Ivanchenko)
//
//
// Class Description:
@@ -82,6 +84,7 @@ G4eeToTwoGammaModel::G4eeToTwoGammaModel(const G4ParticleDefinition*,
: G4VEmModel(nam),
pi_rcl2(pi*classic_electr_radius*classic_electr_radius)
{
theGamma = G4Gamma::Gamma();
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -151,66 +154,96 @@ vector<G4DynamicParticle*>* G4eeToTwoGammaModel::SampleSecondaries(
G4double,
G4double)
{
G4double PositKinEnergy = dp->GetKineticEnergy();
G4ThreeVector PositDirection = dp->GetMomentumDirection();
G4double tau = PositKinEnergy/electron_mass_c2;
G4double gam = tau + 1.0;
G4double tau2 = tau + 2.0;
G4double sqgrate = sqrt(tau/tau2)*0.5;
G4double sqg2m1 = sqrt(tau*tau2);
// limits of the energy sampling
G4double epsilmin = 0.5 - sqgrate;
G4double epsilmax = 0.5 + sqgrate;
G4double epsilqot = epsilmax/epsilmin;
//
// sample the energy rate of the created gammas
//
G4double epsil, greject;
do {
epsil = epsilmin*pow(epsilqot,G4UniformRand());
greject = 1. - epsil + (2.*gam*epsil-1.)/(epsil*tau2*tau2);
} while( greject < G4UniformRand() );
//
// scattered Gamma angles. ( Z - axis along the parent positron)
//
G4double cost = (epsil*tau2-1.)/(epsil*sqg2m1);
G4double sint = sqrt((1.+cost)*(1.-cost));
G4double phi = twopi * G4UniformRand();
G4double dirx = sint*cos(phi) , diry = sint*sin(phi) , dirz = cost;
//
// kinematic of the created pair
//
G4double TotalAvailableEnergy = PositKinEnergy + 2.0*electron_mass_c2;
G4double Phot1Energy = epsil*TotalAvailableEnergy;
vector<G4DynamicParticle*>* vdp = new vector<G4DynamicParticle*>;
G4double PositKinEnergy = dp->GetKineticEnergy();
G4ThreeVector Phot1Direction (dirx, diry, dirz);
Phot1Direction.rotateUz(PositDirection);
G4DynamicParticle* aParticle1 = new G4DynamicParticle (G4Gamma::Gamma(),
Phot1Direction, Phot1Energy);
vdp->push_back(aParticle1);
// Case at rest
if(PositKinEnergy == 0.0) {
G4double cost = 2.*G4UniformRand()-1.;
G4double sint = sqrt((1. - cost)*(1. + cost));
G4double phi = twopi * G4UniformRand();
G4ThreeVector dir (sint*cos(phi), sint*sin(phi), cost);
G4DynamicParticle* aGamma1 = new G4DynamicParticle(theGamma,
dir, electron_mass_c2);
G4DynamicParticle* aGamma2 = new G4DynamicParticle(theGamma,
-dir, electron_mass_c2);
vdp->push_back(aGamma1);
vdp->push_back(aGamma2);
G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy;
G4double Eratio= Phot1Energy/Phot2Energy;
G4double PositP= sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2));
G4ThreeVector Phot2Direction (-dirx*Eratio, -diry*Eratio,
(PositP-dirz*Phot1Energy)/Phot2Energy);
Phot2Direction.unit();
Phot2Direction.rotateUz(PositDirection);
// create G4DynamicParticle object for the particle2
G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(),
Phot2Direction, Phot2Energy);
vdp->push_back(aParticle2);
} else {
G4ThreeVector PositDirection = dp->GetMomentumDirection();
G4double tau = PositKinEnergy/electron_mass_c2;
G4double gam = tau + 1.0;
G4double tau2 = tau + 2.0;
G4double sqgrate = sqrt(tau/tau2)*0.5;
G4double sqg2m1 = sqrt(tau*tau2);
// limits of the energy sampling
G4double epsilmin = 0.5 - sqgrate;
G4double epsilmax = 0.5 + sqgrate;
G4double epsilqot = epsilmax/epsilmin;
//
// sample the energy rate of the created gammas
//
G4double epsil, greject;
do {
epsil = epsilmin*pow(epsilqot,G4UniformRand());
greject = 1. - epsil + (2.*gam*epsil-1.)/(epsil*tau2*tau2);
} while( greject < G4UniformRand() );
//
// scattered Gamma angles. ( Z - axis along the parent positron)
//
G4double cost = (epsil*tau2-1.)/(epsil*sqg2m1);
if(std::abs(cost) > 1.0) {
G4cout << "### G4eeToTwoGammaModel WARNING cost= " << cost
<< " positron Ekin(MeV)= " << PositKinEnergy
<< " gamma epsil= " << epsil
<< G4endl;
if(cost > 1.0) cost = 1.0;
else cost = -1.0;
}
G4double sint = sqrt((1.+cost)*(1.-cost));
G4double phi = twopi * G4UniformRand();
G4double dirx = sint*cos(phi) , diry = sint*sin(phi) , dirz = cost;
//
// kinematic of the created pair
//
G4double TotalAvailableEnergy = PositKinEnergy + 2.0*electron_mass_c2;
G4double Phot1Energy = epsil*TotalAvailableEnergy;
G4ThreeVector Phot1Direction (dirx, diry, dirz);
Phot1Direction.rotateUz(PositDirection);
G4DynamicParticle* aGamma1 =
new G4DynamicParticle (theGamma,Phot1Direction, Phot1Energy);
vdp->push_back(aGamma1);
G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy;
G4double PositP= sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2));
G4ThreeVector dir = PositDirection*PositP - Phot1Direction*Phot1Energy;
G4ThreeVector Phot2Direction = dir.unit();
// create G4DynamicParticle object for the particle2
G4DynamicParticle* aGamma2=
new G4DynamicParticle (theGamma,Phot2Direction, Phot2Energy);
vdp->push_back(aGamma2);
/*
G4cout << "Annihilation in fly: e0= " << PositKinEnergy
<< " m= " << electron_mass_c2
<< " e1= " << Phot1Energy
<< " e2= " << Phot2Energy << " dir= " << dir
<< " -> " << Phot1Direction << " "
<< Phot2Direction << G4endl;
*/
}
return vdp;
}