#include <G4BetheHeitlerModel.hh>

Inheritance diagram for G4BetheHeitlerModel:

Collaboration diagram for G4BetheHeitlerModel:

Public Member Functions
	G4BetheHeitlerModel (const G4ParticleDefinition *p=0, const G4String &nam="BetheHeitler")

virtual	~G4BetheHeitlerModel ()

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

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cut=0., G4double emax=DBL_MAX)

virtual void	SampleSecondaries (std::vector< G4DynamicParticle > , const G4MaterialCutsCouple , const G4DynamicParticle , G4double tmin, G4double maxEnergy)

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

virtual	~G4VEmModel ()

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

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

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 , G4double &eloss, G4double &niel, G4double length)

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	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)

G4int	SelectIsotopeNumber (const G4Element *)

const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, 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)

G4int	SelectRandomAtomNumber (const G4Material *)

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=0)

void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)

G4ElementData *	GetElementData ()

G4PhysicsTable *	GetCrossSectionTable ()

G4VEmFluctuationModel *	GetModelOfFluctuations ()

G4VEmAngularDistribution *	GetAngularDistribution ()

void	SetAngularDistribution (G4VEmAngularDistribution *)

G4double	HighEnergyLimit () const

G4double	LowEnergyLimit () const

G4double	HighEnergyActivationLimit () const

G4double	LowEnergyActivationLimit () const

G4double	PolarAngleLimit () const

G4double	SecondaryThreshold () const

G4bool	LPMFlag () 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)

void	SetPolarAngleLimit (G4double)

void	SetSecondaryThreshold (G4double)

void	SetLPMFlag (G4bool val)

void	SetDeexcitationFlag (G4bool val)

void	SetForceBuildTable (G4bool val)

void	SetMasterThread (G4bool val)

G4bool	IsMaster () const

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

const G4Element *	GetCurrentElement () const

const G4Isotope *	GetCurrentIsotope () const

G4bool	IsLocked () const

void	SetLocked (G4bool)

Private Member Functions
G4double	ScreenFunction1 (G4double ScreenVariable)

G4double	ScreenFunction2 (G4double ScreenVariable)

G4BetheHeitlerModel &	operator= (const G4BetheHeitlerModel &right)

	G4BetheHeitlerModel (const G4BetheHeitlerModel &)

Private Attributes
G4Pow *	g4pow

G4ParticleDefinition *	theGamma

G4ParticleDefinition *	theElectron

G4ParticleDefinition *	thePositron

G4ParticleChangeForGamma *	fParticleChange

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

G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

size_t	idxTable

Static Protected Attributes inherited from G4VEmModel
static const G4double	inveplus = 1.0/CLHEP::eplus

Detailed Description

Definition at line 60 of file G4BetheHeitlerModel.hh.

Constructor & Destructor Documentation

◆ G4BetheHeitlerModel() [1/2]

G4BetheHeitlerModel::G4BetheHeitlerModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	nam = `"BetheHeitler"`
	)

Definition at line 85 of file G4BetheHeitlerModel.cc.

   : G4VEmModel(nam)
 {
   fParticleChange = 0;
   theGamma    = G4Gamma::Gamma();
   thePositron = G4Positron::Positron();
   theElectron = G4Electron::Electron();
   g4pow = G4Pow::GetInstance();
 }

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◆ ~G4BetheHeitlerModel()

G4BetheHeitlerModel::~G4BetheHeitlerModel ( )

virtual

Definition at line 98 of file G4BetheHeitlerModel.cc.

99 {}

◆ G4BetheHeitlerModel() [2/2]

G4BetheHeitlerModel::G4BetheHeitlerModel ( const G4BetheHeitlerModel & )

private

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4BetheHeitlerModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kinEnergy,
		G4double	Z,
		G4double	A = `0.`,
		G4double	cut = `0.`,
		G4double	emax = `DBL_MAX`
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 121 of file G4BetheHeitlerModel.cc.

 {
   G4double xSection = 0.0 ;
   if ( Z < 0.9 || GammaEnergy <= 2.0*electron_mass_c2 ) { return xSection; }
 
 
   G4double GammaEnergySave = GammaEnergy;
   if (GammaEnergy < GammaEnergyLimit) { GammaEnergy = GammaEnergyLimit; }
 
   G4double X=G4Log(GammaEnergy/electron_mass_c2), X2=X*X, X3=X2*X, X4=X3*X, X5=X4*X;
 
   G4double F1 = a0 + a1*X + a2*X2 + a3*X3 + a4*X4 + a5*X5,
            F2 = b0 + b1*X + b2*X2 + b3*X3 + b4*X4 + b5*X5,
            F3 = c0 + c1*X + c2*X2 + c3*X3 + c4*X4 + c5*X5;     
 
   xSection = (Z + 1.)*(F1*Z + F2*Z*Z + F3);
 
   if (GammaEnergySave < GammaEnergyLimit) {
 
     X = (GammaEnergySave  - 2.*electron_mass_c2)
       / (GammaEnergyLimit - 2.*electron_mass_c2);
     xSection *= X*X;
   }
 
   if (xSection < 0.) { xSection = 0.; }
   return xSection;
 }

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◆ Initialise()

void G4BetheHeitlerModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &	cuts
	)

virtual

Implements G4VEmModel.

Reimplemented in G4PolarizedGammaConversionModel.

Definition at line 103 of file G4BetheHeitlerModel.cc.

 {
   if(!fParticleChange) { fParticleChange = GetParticleChangeForGamma(); }
   if(IsMaster()) { InitialiseElementSelectors(p, cuts); }
 }

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◆ InitialiseLocal()

void G4BetheHeitlerModel::InitialiseLocal	(	const G4ParticleDefinition *	,
		G4VEmModel *	masterModel
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 112 of file G4BetheHeitlerModel.cc.

 {
   SetElementSelectors(masterModel->GetElementSelectors());
 }

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◆ operator=()

G4BetheHeitlerModel& G4BetheHeitlerModel::operator= ( const G4BetheHeitlerModel & right )

private

◆ SampleSecondaries()

void G4BetheHeitlerModel::SampleSecondaries	(	std::vector< G4DynamicParticle >	fvect,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	aDynamicGamma,
		G4double	tmin,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Reimplemented in G4PolarizedGammaConversionModel.

Definition at line 159 of file G4BetheHeitlerModel.cc.

 {
   const G4Material* aMaterial = couple->GetMaterial();
 
   G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
   G4ParticleMomentum GammaDirection = aDynamicGamma->GetMomentumDirection();
 
   G4double epsil ;
   G4double epsil0 = electron_mass_c2/GammaEnergy ;
   if(epsil0 > 1.0) { return; }
 
   // do it fast if GammaEnergy < Egsmall
   // select randomly one element constituing the material
   const G4Element* anElement = SelectRandomAtom(aMaterial, theGamma, GammaEnergy);
 
   CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
 
   if (GammaEnergy < Egsmall) {
 
     epsil = epsil0 + (0.5-epsil0)*rndmEngine->flat();
 
   } else {
     // now comes the case with GammaEnergy >= 2. MeV
 
     // Extract Coulomb factor for this Element
     G4double FZ = 8.*(anElement->GetIonisation()->GetlogZ3());
     if (GammaEnergy > 50.*MeV) { FZ += 8.*(anElement->GetfCoulomb()); }
 
     // limits of the screening variable
     G4double screenfac = 136.*epsil0/(anElement->GetIonisation()->GetZ3());
     G4double screenmax = exp ((42.24 - FZ)/8.368) - 0.952 ;
     G4double screenmin = min(4.*screenfac,screenmax);
 
     // limits of the energy sampling
     G4double epsil1 = 0.5 - 0.5*sqrt(1. - screenmin/screenmax) ;
     G4double epsilmin = max(epsil0,epsil1) , epsilrange = 0.5 - epsilmin;
 
     //
     // sample the energy rate of the created electron (or positron)
     //
     //G4double epsil, screenvar, greject ;
     G4double  screenvar, greject ;
 
     G4double F10 = ScreenFunction1(screenmin) - FZ;
     G4double F20 = ScreenFunction2(screenmin) - FZ;
     G4double NormF1 = max(F10*epsilrange*epsilrange,0.); 
     G4double NormF2 = max(1.5*F20,0.);
 
     do {
       if ( NormF1/(NormF1+NormF2) > rndmEngine->flat()) {
     epsil = 0.5 - epsilrange*g4pow->A13(rndmEngine->flat());
     screenvar = screenfac/(epsil*(1-epsil));
     greject = (ScreenFunction1(screenvar) - FZ)/F10;
               
       } else { 
     epsil = epsilmin + epsilrange*rndmEngine->flat();
     screenvar = screenfac/(epsil*(1-epsil));
     greject = (ScreenFunction2(screenvar) - FZ)/F20;
       }
 
       // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
     } while( greject < rndmEngine->flat());
 
   }   //  end of epsil sampling
    
   //
   // fixe charges randomly
   //
 
   G4double ElectTotEnergy, PositTotEnergy;
   if (rndmEngine->flat() > 0.5) {
 
     ElectTotEnergy = (1.-epsil)*GammaEnergy;
     PositTotEnergy = epsil*GammaEnergy;
      
   } else {
     
     PositTotEnergy = (1.-epsil)*GammaEnergy;
     ElectTotEnergy = epsil*GammaEnergy;
   }
 
   //
   // scattered electron (positron) angles. ( Z - axis along the parent photon)
   //
   //  universal distribution suggested by L. Urban 
   // (Geant3 manual (1993) Phys211),
   //  derived from Tsai distribution (Rev Mod Phys 49,421(1977))
 
   G4double u= - G4Log(rndmEngine->flat()*rndmEngine->flat());
 
   if (9. > 36.*rndmEngine->flat()) { u *= 1.6; }
   else                             { u *= 0.53333; } 
 
   G4double TetEl = u*electron_mass_c2/ElectTotEnergy;
   G4double TetPo = u*electron_mass_c2/PositTotEnergy;
   G4double Phi  = twopi * rndmEngine->flat();
   G4double dxEl= sin(TetEl)*cos(Phi),dyEl= sin(TetEl)*sin(Phi),dzEl=cos(TetEl);
   G4double dxPo=-sin(TetPo)*cos(Phi),dyPo=-sin(TetPo)*sin(Phi),dzPo=cos(TetPo);
    
   //
   // kinematic of the created pair
   //
   // the electron and positron are assumed to have a symetric
   // angular distribution with respect to the Z axis along the parent photon.
 
   G4double ElectKineEnergy = max(0.,ElectTotEnergy - electron_mass_c2);
 
   G4ThreeVector ElectDirection (dxEl, dyEl, dzEl);
   ElectDirection.rotateUz(GammaDirection);   
 
   // create G4DynamicParticle object for the particle1  
   G4DynamicParticle* aParticle1= new G4DynamicParticle(
              theElectron,ElectDirection,ElectKineEnergy);
   
   // the e+ is always created (even with Ekine=0) for further annihilation.
 
   G4double PositKineEnergy = max(0.,PositTotEnergy - electron_mass_c2);
 
   G4ThreeVector PositDirection (dxPo, dyPo, dzPo);
   PositDirection.rotateUz(GammaDirection);   
 
   // create G4DynamicParticle object for the particle2 
   G4DynamicParticle* aParticle2= new G4DynamicParticle(
                       thePositron,PositDirection,PositKineEnergy);
 
   // Fill output vector
   fvect->push_back(aParticle1);
   fvect->push_back(aParticle2);
 
   // kill incident photon
   fParticleChange->SetProposedKineticEnergy(0.);
   fParticleChange->ProposeTrackStatus(fStopAndKill);   
 }

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◆ ScreenFunction1()

G4double G4BetheHeitlerModel::ScreenFunction1 ( G4double ScreenVariable )

inlineprivate

Definition at line 108 of file G4BetheHeitlerModel.hh.

 {
    G4double screenVal;
 
    if (ScreenVariable > 1.)
      screenVal = 42.24 - 8.368*G4Log(ScreenVariable+0.952);
    else
      screenVal = 42.392 - ScreenVariable*(7.796 - 1.961*ScreenVariable);
 
    return screenVal;
 }

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◆ ScreenFunction2()

G4double G4BetheHeitlerModel::ScreenFunction2 ( G4double ScreenVariable )

inlineprivate

Definition at line 125 of file G4BetheHeitlerModel.hh.

 {
    G4double screenVal;
 
    if (ScreenVariable > 1.)
      screenVal = 42.24 - 8.368*G4Log(ScreenVariable+0.952);
    else
      screenVal = 41.405 - ScreenVariable*(5.828 - 0.8945*ScreenVariable);
 
    return screenVal;
 }

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Member Data Documentation

◆ fParticleChange

G4ParticleChangeForGamma* G4BetheHeitlerModel::fParticleChange

private

Definition at line 103 of file G4BetheHeitlerModel.hh.

◆ g4pow

G4Pow* G4BetheHeitlerModel::g4pow

private

Definition at line 99 of file G4BetheHeitlerModel.hh.

◆ theElectron

G4ParticleDefinition* G4BetheHeitlerModel::theElectron

private

Definition at line 101 of file G4BetheHeitlerModel.hh.

◆ theGamma

G4ParticleDefinition* G4BetheHeitlerModel::theGamma

private

Definition at line 100 of file G4BetheHeitlerModel.hh.

◆ thePositron

G4ParticleDefinition* G4BetheHeitlerModel::thePositron

private

Definition at line 102 of file G4BetheHeitlerModel.hh.

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

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4BetheHeitlerModel() [1/2]

◆ ~G4BetheHeitlerModel()

◆ G4BetheHeitlerModel() [2/2]

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ Initialise()

◆ InitialiseLocal()

◆ operator=()

◆ SampleSecondaries()

◆ ScreenFunction1()

◆ ScreenFunction2()

Member Data Documentation

◆ fParticleChange

◆ g4pow

◆ theElectron

◆ theGamma

◆ thePositron