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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/G4eplusAnnihilation.cc
+82 -43
View File
@@ -23,7 +23,7 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4eplusAnnihilation.cc 107058 2017-11-01 14:54:12Z gcosmo $
// $Id: G4eplusAnnihilation.cc 109177 2018-04-03 06:55:14Z gcosmo $
//
// -------------------------------------------------------------------
//
@@ -59,6 +59,7 @@
#include "G4Gamma.hh"
#include "G4Positron.hh"
#include "G4eeToTwoGammaModel.hh"
#include "G4EmBiasingManager.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -74,6 +75,7 @@ G4eplusAnnihilation::G4eplusAnnihilation(const G4String& name)
SetSecondaryParticle(theGamma);
SetProcessSubType(fAnnihilation);
enableAtRestDoIt = true;
mainSecondaries = 2;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -118,55 +120,92 @@ void G4eplusAnnihilation::StreamProcessInfo(std::ostream&,
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4VParticleChange* G4eplusAnnihilation::AtRestDoIt(const G4Track& aTrack,
const G4Step& )
//
G4VParticleChange* G4eplusAnnihilation::AtRestDoIt(const G4Track& track,
const G4Step& step)
// Performs the e+ e- annihilation when both particles are assumed at rest.
// It generates two back to back photons with energy = electron_mass.
// The angular distribution is isotropic.
// GEANT4 internal units
//
// Note : Effects due to binding of atomic electrons are negliged.
{
fParticleChange.InitializeForPostStep(aTrack);
CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
fParticleChange.InitializeForPostStep(track);
size_t idx = CurrentMaterialCutsCoupleIndex();
G4double ene(0.0);
G4VEmModel* model = SelectModel(ene, idx);
G4double cosTeta = 2.*rndmEngine->flat()-1.;
G4double sinTeta = sqrt((1.-cosTeta)*(1.0 + cosTeta));
G4double phi = twopi * rndmEngine->flat();
G4ThreeVector dir(sinTeta*cos(phi), sinTeta*sin(phi), cosTeta);
phi = twopi * rndmEngine->flat();
G4double cosphi = cos(phi);
G4double sinphi = sin(phi);
G4ThreeVector pol(cosphi, sinphi, 0.0);
pol.rotateUz(dir);
// define new weight for primary and secondaries
G4double weight = fParticleChange.GetParentWeight();
// e+ parameters
G4double weight = aTrack.GetWeight();
G4double time = aTrack.GetGlobalTime();
// sample secondaries
secParticles.clear();
G4double gammaCut = GetGammaEnergyCut();
model->SampleSecondaries(&secParticles, MaterialCutsCouple(),
track.GetDynamicParticle(), gammaCut);
G4int num0 = secParticles.size();
// add gammas
fParticleChange.SetNumberOfSecondaries(2);
G4DynamicParticle* dp =
new G4DynamicParticle(theGamma, dir, electron_mass_c2);
dp->SetPolarization(pol.x(),pol.y(),pol.z());
G4Track* track = new G4Track(dp, time, aTrack.GetPosition());
track->SetTouchableHandle(aTrack.GetTouchableHandle());
track->SetWeight(weight);
pParticleChange->AddSecondary(track);
// splitting or Russian roulette
if(biasManager) {
if(biasManager->SecondaryBiasingRegion(idx)) {
G4double eloss = 0.0;
weight *= biasManager->ApplySecondaryBiasing(
secParticles, track, model, &fParticleChange, eloss,
idx, gammaCut, step.GetPostStepPoint()->GetSafety());
if(eloss > 0.0) {
eloss += fParticleChange.GetLocalEnergyDeposit();
fParticleChange.ProposeLocalEnergyDeposit(eloss);
}
}
}
// save secondaries
G4int num = secParticles.size();
if(num > 0) {
dp = new G4DynamicParticle(theGamma,-dir, electron_mass_c2);
pol.set(-sinphi, cosphi, 0.0);
pol.rotateUz(dir);
dp->SetPolarization(pol.x(),pol.y(),pol.z());
track = new G4Track(dp, time, aTrack.GetPosition());
track->SetTouchableHandle(aTrack.GetTouchableHandle());
track->SetWeight(weight);
pParticleChange->AddSecondary(track);
fParticleChange.SetNumberOfSecondaries(num);
G4double edep = fParticleChange.GetLocalEnergyDeposit();
G4double time = track.GetGlobalTime();
for (G4int i=0; i<num; ++i) {
if (secParticles[i]) {
G4DynamicParticle* dp = secParticles[i];
const G4ParticleDefinition* p = dp->GetParticleDefinition();
G4double e = dp->GetKineticEnergy();
G4bool good = true;
if(ApplyCuts()) {
if (p == theGamma) {
if (e < gammaCut) { good = false; }
} else if (p == theElectron) {
if (e < GetElectronEnergyCut()) { good = false; }
}
// added secondary if it is good
}
if (good) {
G4Track* t = new G4Track(dp, time, track.GetPosition());
t->SetTouchableHandle(track.GetTouchableHandle());
t->SetWeight(weight);
pParticleChange->AddSecondary(t);
// Kill the incident positron
//
fParticleChange.ProposeTrackStatus(fStopAndKill);
// define type of secondary
if(i < mainSecondaries) { t->SetCreatorModelIndex(secID); }
else if(i < num0) {
if(p == theGamma) {
t->SetCreatorModelIndex(fluoID);
} else {
t->SetCreatorModelIndex(augerID);
}
} else {
t->SetCreatorModelIndex(biasID);
}
/*
G4cout << "Secondary(post step) has weight " << t->GetWeight()
<< ", Ekin= " << t->GetKineticEnergy()/MeV << " MeV "
<< GetProcessName() << " fluoID= " << fluoID
<< " augerID= " << augerID <<G4endl;
*/
} else {
delete dp;
edep += e;
}
}
}
fParticleChange.ProposeLocalEnergyDeposit(edep);
}
return &fParticleChange;
}