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This commit is contained in:
Gabriele Cosmo
2018-06-29 10:58:11 +02:00
parent fe81a77428
commit 6aa23be517
1581 changed files with 124288 additions and 83758 deletions
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source/processes/electromagnetic/standard/src/G4eeToTwoGammaModel.cc
+44 -43
View File
@@ -23,7 +23,7 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4eeToTwoGammaModel.cc 101198 2016-11-09 09:34:52Z gcosmo $
// $Id: G4eeToTwoGammaModel.cc 109177 2018-04-03 06:55:14Z gcosmo $
//
// -------------------------------------------------------------------
//
@@ -87,8 +87,7 @@ using namespace std;
G4eeToTwoGammaModel::G4eeToTwoGammaModel(const G4ParticleDefinition*,
const G4String& nam)
: G4VEmModel(nam),
pi_rcl2(pi*classic_electr_radius*classic_electr_radius),
isInitialised(false)
pi_rcl2(pi*classic_electr_radius*classic_electr_radius)
{
theGamma = G4Gamma::Gamma();
fParticleChange = nullptr;
@@ -104,17 +103,14 @@ G4eeToTwoGammaModel::~G4eeToTwoGammaModel()
void G4eeToTwoGammaModel::Initialise(const G4ParticleDefinition*,
const G4DataVector&)
{
if(isInitialised) { return; }
if(fParticleChange) { return; }
fParticleChange = GetParticleChangeForGamma();
isInitialised = true;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(
const G4ParticleDefinition*,
G4double kineticEnergy,
G4double, G4double)
G4double
G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(G4double kineticEnergy)
{
// Calculates the cross section per electron of annihilation into two photons
// from the Heilter formula.
@@ -135,13 +131,13 @@ G4double G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4eeToTwoGammaModel::ComputeCrossSectionPerAtom(
const G4ParticleDefinition* p,
const G4ParticleDefinition*,
G4double kineticEnergy, G4double Z,
G4double, G4double, G4double)
{
// Calculates the cross section per atom of annihilation into two photons
G4double cross = Z*ComputeCrossSectionPerElectron(p,kineticEnergy);
G4double cross = Z*ComputeCrossSectionPerElectron(kineticEnergy);
return cross;
}
@@ -149,14 +145,14 @@ G4double G4eeToTwoGammaModel::ComputeCrossSectionPerAtom(
G4double G4eeToTwoGammaModel::CrossSectionPerVolume(
const G4Material* material,
const G4ParticleDefinition* p,
const G4ParticleDefinition*,
G4double kineticEnergy,
G4double, G4double)
{
// Calculates the cross section per volume of annihilation into two photons
G4double eDensity = material->GetElectronDensity();
G4double cross = eDensity*ComputeCrossSectionPerElectron(p,kineticEnergy);
G4double cross = eDensity*ComputeCrossSectionPerElectron(kineticEnergy);
return cross;
}
@@ -171,13 +167,13 @@ void G4eeToTwoGammaModel::SampleSecondaries(vector<G4DynamicParticle*>* vdp,
G4double,
G4double)
{
G4double PositKinEnergy = dp->GetKineticEnergy();
G4double posiKinEnergy = dp->GetKineticEnergy();
G4DynamicParticle *aGamma1, *aGamma2;
CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
// Case at rest
if(PositKinEnergy == 0.0) {
if(posiKinEnergy == 0.0) {
G4double cost = 2.*rndmEngine->flat()-1.;
G4double sint = sqrt((1. - cost)*(1. + cost));
G4double phi = twopi * rndmEngine->flat();
@@ -193,12 +189,15 @@ void G4eeToTwoGammaModel::SampleSecondaries(vector<G4DynamicParticle*>* vdp,
pol.set(-sinphi, cosphi, 0.0);
pol.rotateUz(dir);
aGamma2->SetPolarization(pol.x(),pol.y(),pol.z());
/*
G4cout << "Annihilation at rest fly: e0= " << " dir= " << dir
<< G4endl;
*/
} else {
G4ThreeVector PositDirection = dp->GetMomentumDirection();
G4ThreeVector posiDirection = dp->GetMomentumDirection();
G4double tau = PositKinEnergy/electron_mass_c2;
G4double tau = posiKinEnergy/electron_mass_c2;
G4double gam = tau + 1.0;
G4double tau2 = tau + 2.0;
G4double sqgrate = sqrt(tau/tau2)*0.5;
@@ -227,7 +226,7 @@ void G4eeToTwoGammaModel::SampleSecondaries(vector<G4DynamicParticle*>* vdp,
G4double cost = (epsil*tau2-1.)/(epsil*sqg2m1);
if(std::abs(cost) > 1.0) {
G4cout << "### G4eeToTwoGammaModel WARNING cost= " << cost
<< " positron Ekin(MeV)= " << PositKinEnergy
<< " positron Ekin(MeV)= " << posiKinEnergy
<< " gamma epsil= " << epsil
<< G4endl;
if(cost > 1.0) cost = 1.0;
@@ -240,47 +239,49 @@ void G4eeToTwoGammaModel::SampleSecondaries(vector<G4DynamicParticle*>* vdp,
// kinematic of the created pair
//
G4double TotalAvailableEnergy = PositKinEnergy + 2.0*electron_mass_c2;
G4double Phot1Energy = epsil*TotalAvailableEnergy;
G4double totalEnergy = posiKinEnergy + 2.0*electron_mass_c2;
G4double phot1Energy = epsil*totalEnergy;
G4ThreeVector Phot1Direction(sint*cos(phi), sint*sin(phi), cost);
Phot1Direction.rotateUz(PositDirection);
aGamma1 = new G4DynamicParticle (theGamma,Phot1Direction, Phot1Energy);
G4ThreeVector phot1Direction(sint*cos(phi), sint*sin(phi), cost);
phot1Direction.rotateUz(posiDirection);
aGamma1 = new G4DynamicParticle (theGamma,phot1Direction, phot1Energy);
phi = twopi * rndmEngine->flat();
G4double cosphi = cos(phi);
G4double sinphi = sin(phi);
G4ThreeVector pol(cosphi, sinphi, 0.0);
pol.rotateUz(Phot1Direction);
pol.rotateUz(phot1Direction);
aGamma1->SetPolarization(pol.x(),pol.y(),pol.z());
G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy;
G4double PositP= sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2));
G4ThreeVector dir = PositDirection*PositP - Phot1Direction*Phot1Energy;
G4ThreeVector Phot2Direction = dir.unit();
G4double phot2Energy =(1.-epsil)*totalEnergy;
G4double posiP= sqrt(posiKinEnergy*(posiKinEnergy+2.*electron_mass_c2));
G4ThreeVector dir = posiDirection*posiP - phot1Direction*phot1Energy;
G4ThreeVector phot2Direction = dir.unit();
// create G4DynamicParticle object for the particle2
aGamma2 = new G4DynamicParticle (theGamma,Phot2Direction, Phot2Energy);
aGamma2 = new G4DynamicParticle (theGamma, phot2Direction, phot2Energy);
//!!! likely problematic direction to be checked
pol.set(-sinphi, cosphi, 0.0);
pol.rotateUz(Phot1Direction);
cost = pol*Phot2Direction;
pol -= cost*Phot2Direction;
pol.rotateUz(phot1Direction);
cost = pol*phot2Direction;
pol -= cost*phot2Direction;
pol = pol.unit();
aGamma2->SetPolarization(pol.x(),pol.y(),pol.z());
}
/*
G4cout << "Annihilation in fly: e0= " << PositKinEnergy
<< " m= " << electron_mass_c2
<< " e1= " << Phot1Energy
<< " e2= " << Phot2Energy << " dir= " << dir
<< " -> " << Phot1Direction << " "
<< Phot2Direction << G4endl;
*/
/*
G4cout << "Annihilation on fly: e0= " << posiKinEnergy
<< " m= " << electron_mass_c2
<< " e1= " << phot1Energy
<< " e2= " << phot2Energy << " dir= " << dir
<< " -> " << phot1Direction << " "
<< phot2Direction << G4endl;
*/
}
vdp->push_back(aGamma1);
vdp->push_back(aGamma2);
fParticleChange->SetProposedKineticEnergy(0.);
// kill primary positron
fParticleChange->SetProposedKineticEnergy(0.0);
fParticleChange->ProposeTrackStatus(fStopAndKill);
}