#include <G4eplusTo2or3GammaModel.hh>

Inheritance diagram for G4eplusTo2or3GammaModel:

Public Member Functions
	G4eplusTo2or3GammaModel ()

	~G4eplusTo2or3GammaModel () override

void	Initialise (const G4ParticleDefinition *, const G4DataVector &) override

G4double	ComputeCrossSectionPerElectron (G4double kinEnergy)

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0., G4double maxEnergy=DBL_MAX) override

G4double	CrossSectionPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX) override

void	SampleSecondaries (std::vector< G4DynamicParticle * > , const G4MaterialCutsCouple , const G4DynamicParticle *, G4double tmin=0.0, G4double maxEnergy=DBL_MAX) override

void	SetDelta (G4double val)

G4eplusTo2or3GammaModel &	operator= (const G4eplusTo2or3GammaModel &right)=delete

	G4eplusTo2or3GammaModel (const G4eplusTo2or3GammaModel &)=delete

Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)

virtual	~G4VEmModel ()

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

virtual void	InitialiseForMaterial (const G4ParticleDefinition , const G4Material )

virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)

virtual G4double	ComputeDEDXPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=DBL_MAX)

virtual G4double	GetPartialCrossSection (const G4Material , G4int level, const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	ComputeCrossSectionPerShell (const G4ParticleDefinition *, G4int Z, G4int shellIdx, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

virtual G4double	ChargeSquareRatio (const G4Track &)

virtual G4double	GetChargeSquareRatio (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual G4double	GetParticleCharge (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	StartTracking (G4Track *)

virtual void	CorrectionsAlongStep (const G4MaterialCutsCouple , const G4DynamicParticle , const G4double &length, G4double &eloss)

virtual G4double	Value (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition , G4double cut=0.0)

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple )

virtual void	SetupForMaterial (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	DefineForRegion (const G4Region *)

virtual void	FillNumberOfSecondaries (G4int &numberOfTriplets, G4int &numberOfRecoil)

virtual void	ModelDescription (std::ostream &outFile) const

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

std::vector< G4EmElementSelector * > *	GetElementSelectors ()

void	SetElementSelectors (std::vector< G4EmElementSelector * > *)

G4double	ComputeDEDX (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=DBL_MAX)

G4double	CrossSection (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

G4double	ComputeMeanFreePath (const G4ParticleDefinition , G4double kineticEnergy, const G4Material , G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition , const G4Element , G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectTargetAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double logKineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectRandomAtom (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	GetCurrentElement (const G4Material *mat=nullptr) const

G4int	SelectRandomAtomNumber (const G4Material *) const

const G4Isotope *	GetCurrentIsotope (const G4Element *elm=nullptr) const

G4int	SelectIsotopeNumber (const G4Element *) const

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=nullptr)

void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)

G4ElementData *	GetElementData ()

G4PhysicsTable *	GetCrossSectionTable ()

G4VEmFluctuationModel *	GetModelOfFluctuations ()

G4VEmAngularDistribution *	GetAngularDistribution ()

G4VEmModel *	GetTripletModel ()

void	SetTripletModel (G4VEmModel *)

void	SetAngularDistribution (G4VEmAngularDistribution *)

G4double	HighEnergyLimit () const

G4double	LowEnergyLimit () const

G4double	HighEnergyActivationLimit () const

G4double	LowEnergyActivationLimit () const

G4double	PolarAngleLimit () const

G4double	SecondaryThreshold () const

G4bool	DeexcitationFlag () const

G4bool	ForceBuildTableFlag () const

G4bool	UseAngularGeneratorFlag () const

void	SetAngularGeneratorFlag (G4bool)

void	SetHighEnergyLimit (G4double)

void	SetLowEnergyLimit (G4double)

void	SetActivationHighEnergyLimit (G4double)

void	SetActivationLowEnergyLimit (G4double)

G4bool	IsActive (G4double kinEnergy) const

void	SetPolarAngleLimit (G4double)

void	SetSecondaryThreshold (G4double)

void	SetDeexcitationFlag (G4bool val)

void	SetForceBuildTable (G4bool val)

void	SetFluctuationFlag (G4bool val)

G4bool	IsMaster () const

void	SetUseBaseMaterials (G4bool val)

G4bool	UseBaseMaterials () const

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

G4bool	IsLocked () const

void	SetLocked (G4bool)

void	SetLPMFlag (G4bool)

void	SetMasterThread (G4bool)

G4VEmModel &	operator= (const G4VEmModel &right)=delete

	G4VEmModel (const G4VEmModel &)=delete

Additional Inherited Members
Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss *	GetParticleChangeForLoss ()

G4ParticleChangeForGamma *	GetParticleChangeForGamma ()

virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)

const G4MaterialCutsCouple *	CurrentCouple () const

void	SetCurrentElement (const G4Element *)

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData = nullptr

G4VParticleChange *	pParticleChange = nullptr

G4PhysicsTable *	xSectionTable = nullptr

const G4Material *	pBaseMaterial = nullptr

const std::vector< G4double > *	theDensityFactor = nullptr

const std::vector< G4int > *	theDensityIdx = nullptr

G4double	inveplus

G4double	pFactor = 1.0

std::size_t	currentCoupleIndex = 0

std::size_t	basedCoupleIndex = 0

G4bool	lossFlucFlag = true

Detailed Description

Definition at line 66 of file G4eplusTo2or3GammaModel.hh.

Constructor & Destructor Documentation

◆ G4eplusTo2or3GammaModel() [1/2]

G4eplusTo2or3GammaModel::G4eplusTo2or3GammaModel ( )

Definition at line 68 of file G4eplusTo2or3GammaModel.cc.

  : G4VEmModel("eplusTo2or3gamma"),
    fDeltaMin(0.001),
    fDelta(fDeltaMin),
    fGammaTh(CLHEP::MeV)
{
  theGamma = G4Gamma::Gamma();
  fParticleChange = nullptr;
  f3GModel = new G4eplusTo3GammaOKVIModel();
  SetTripletModel(f3GModel);
 
  // instantiate vectors once
  if (nullptr == fCrossSection) {
    G4double emin = 10*CLHEP::eV;
    G4double emax = 100*CLHEP::TeV;
    G4int nbins = 20*G4lrint(std::log10(emax/emin));
    fCrossSection = new G4PhysicsLogVector(emin, emax, nbins, true);
    f3GProbability = new G4PhysicsLogVector(emin, emax, nbins, true);
  }
}

Referenced by G4eplusTo2or3GammaModel(), and operator=().

◆ ~G4eplusTo2or3GammaModel()

G4eplusTo2or3GammaModel::~G4eplusTo2or3GammaModel ( )

override

Definition at line 91 of file G4eplusTo2or3GammaModel.cc.

{
  if (IsMaster()) {
    delete fCrossSection;
    delete f3GProbability;
    fCrossSection = nullptr;
    f3GProbability = nullptr;
  }
}

◆ G4eplusTo2or3GammaModel() [2/2]

G4eplusTo2or3GammaModel::G4eplusTo2or3GammaModel ( const G4eplusTo2or3GammaModel & )

delete

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4eplusTo2or3GammaModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kinEnergy,
		G4double	Z,
		G4double	A = 0.,
		G4double	cutEnergy = 0.,
		G4double	maxEnergy = DBL_MAX )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 161 of file G4eplusTo2or3GammaModel.cc.

{
  // Calculates the cross section per atom of annihilation into two photons
  G4double cross = Z*fCrossSection->Value(kineticEnergy);
  return cross;  
}

◆ ComputeCrossSectionPerElectron()

G4double G4eplusTo2or3GammaModel::ComputeCrossSectionPerElectron ( G4double kinEnergy )

Definition at line 134 of file G4eplusTo2or3GammaModel.cc.

{
  // Calculates the cross section per electron of annihilation into two 
  // photons from the Heilter formula with the radiation correction to 3 gamma 
  // annihilation channel. (A.A.) rho is changed
 
  G4double ekin   = std::max(CLHEP::eV, kinEnergy);   
  G4double tau    = ekin/CLHEP::electron_mass_c2;
  G4double gam    = tau + 1.0;
  G4double gamma2 = gam*gam;
  G4double bg2    = tau * (tau+2.0);
  G4double bg     = std::sqrt(bg2);
  G4double rho = (gamma2+4.*gam+1.)*G4Log(gam+bg)/(gamma2-1.) 
    - (gam+3.)/(std::sqrt(gam*gam - 1.));
  G4double eGammaCMS = CLHEP::electron_mass_c2 * std::sqrt(0.5*(tau + 2.0));
  fDelta = std::max(fDeltaMin, fGammaTh/eGammaCMS);
  f3GModel->SetDelta(fDelta);
 
  static const G4double pir2 =
    CLHEP::pi*CLHEP::classic_electr_radius*CLHEP::classic_electr_radius;
  G4double cross = (pir2*rho + alpha_rcl2*2.*G4Log(fDelta)*rho*rho)/(gam+1.);
 
  return cross;  
}

Referenced by Initialise().

◆ CrossSectionPerVolume()

G4double G4eplusTo2or3GammaModel::CrossSectionPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	cutEnergy = 0.0,
		G4double	maxEnergy = DBL_MAX )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 173 of file G4eplusTo2or3GammaModel.cc.

{
  // Calculates the cross section per volume of annihilation into two photons
  G4double eDensity = material->GetElectronDensity();
  G4double cross = eDensity*fCrossSection->Value(kineticEnergy);
  return cross;
}

◆ Initialise()

void G4eplusTo2or3GammaModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &	cuts )

overridevirtual

Implements G4VEmModel.

Definition at line 103 of file G4eplusTo2or3GammaModel.cc.

{
  // here particle change is set for the triplet model
  if (nullptr == fParticleChange) {
    fParticleChange = GetParticleChangeForGamma();
  }
  // initialialise 3-gamma model before new run
  f3GModel->Initialise(p, cuts);
  fGammaTh = G4EmParameters::Instance()->LowestTripletEnergy();
 
  // initialise vectors
  if (IsMaster()) {
    std::size_t num = fCrossSection->GetVectorLength();
    for (std::size_t i=0; i<num; ++i) {
      G4double e = fCrossSection->Energy(i);
      G4double cs2 = ComputeCrossSectionPerElectron(e);
      G4double cs3 = f3GModel->ComputeCrossSectionPerElectron(e);
      cs2 += cs3;
      fCrossSection->PutValue(i, cs2);
      G4double y = (cs2 > 0.0) ? cs3/cs2 : 0.0;
      f3GProbability->PutValue(i, y);
    }
    fCrossSection->FillSecondDerivatives();
    f3GProbability->FillSecondDerivatives();
  }
}

◆ operator=()

G4eplusTo2or3GammaModel & G4eplusTo2or3GammaModel::operator= ( const G4eplusTo2or3GammaModel & right )

delete

◆ SampleSecondaries()

void G4eplusTo2or3GammaModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	dp,
		G4double	tmin = 0.0,
		G4double	maxEnergy = DBL_MAX )

overridevirtual

!! boost of polarisation vector is not yet implemented

Implements G4VEmModel.

Definition at line 190 of file G4eplusTo2or3GammaModel.cc.

{
  // kill primary positron
  fParticleChange->SetProposedKineticEnergy(0.0);
  fParticleChange->ProposeTrackStatus(fStopAndKill);
 
  // Case at rest not considered anymore
  G4double posiKinEnergy = dp->GetKineticEnergy();
  G4LorentzVector lv(dp->GetMomentum(),
             posiKinEnergy + 2*CLHEP::electron_mass_c2);
  G4double eGammaCMS = 0.5 * lv.mag();
 
  if (G4UniformRand() < f3GProbability->Value(posiKinEnergy)) {
    fDelta = std::max(fDeltaMin, fGammaTh/eGammaCMS);
    f3GModel->SetDelta(fDelta);
    f3GModel->SampleSecondaries(vdp, couple, dp);
    return;
  }
 
  G4ThreeVector dir1 = G4RandomDirection();
  G4double phi = CLHEP::twopi * G4UniformRand();
  G4double cosphi = std::cos(phi);
  G4double sinphi = std::sin(phi);
  G4ThreeVector pol1(cosphi, sinphi, 0.0);
  pol1.rotateUz(dir1);
  G4LorentzVector lv1(eGammaCMS*dir1, eGammaCMS);
  
  G4ThreeVector pol2(-sinphi, cosphi, 0.0);
  pol2.rotateUz(dir1);
 
  // transformation to lab system
  lv1.boost(lv.boostVector());
  lv -= lv1;
 
  //!!! boost of polarisation vector is not yet implemented
  
  // use constructors optimal for massless particle
  auto aGamma1 = new G4DynamicParticle(G4Gamma::Gamma(), lv1.vect());
  aGamma1->SetPolarization(pol1);
  auto aGamma2 = new G4DynamicParticle(G4Gamma::Gamma(), lv.vect());
  aGamma2->SetPolarization(pol2);
 
  vdp->push_back(aGamma1);
  vdp->push_back(aGamma2);
}

◆ SetDelta()

void G4eplusTo2or3GammaModel::SetDelta ( G4double val )

inline

Definition at line 99 of file G4eplusTo2or3GammaModel.hh.

99{ if(val > 0.0) { fDeltaMin = val; } };

The documentation for this class was generated from the following files:

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4eplusTo2or3GammaModel() [1/2]

◆ ~G4eplusTo2or3GammaModel()

◆ G4eplusTo2or3GammaModel() [2/2]

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ ComputeCrossSectionPerElectron()

◆ CrossSectionPerVolume()

◆ Initialise()

◆ operator=()

◆ SampleSecondaries()

◆ SetDelta()