#include <G4MuPairProductionModel.hh>

Inheritance diagram for G4MuPairProductionModel:

Public Member Functions
	G4MuPairProductionModel (const G4ParticleDefinition *p=0, const G4String &nam="muPairProd")

virtual	~G4MuPairProductionModel ()

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

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kineticEnergy, G4double Z, G4double A, G4double cutEnergy, G4double maxEnergy)

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

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

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple )

void	SetLowestKineticEnergy (G4double e)

void	SetParticle (const G4ParticleDefinition *)

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

virtual	~G4VEmModel ()

virtual void	Initialise (const G4ParticleDefinition *, const G4DataVector &)=0

virtual void	SampleSecondaries (std::vector< G4DynamicParticle * > , const G4MaterialCutsCouple , const G4DynamicParticle *, G4double tmin=0.0, G4double tmax=DBL_MAX)=0

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	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., 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 )

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

virtual void	DefineForRegion (const G4Region *)

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

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)

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=0)

void	SetCrossSectionTable (G4PhysicsTable *)

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

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	ForceBuildTable (G4bool val)

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

const G4Element *	GetCurrentElement () const

Protected Member Functions
G4double	ComputMuPairLoss (G4double Z, G4double tkin, G4double cut, G4double tmax)

G4double	ComputeMicroscopicCrossSection (G4double tkin, G4double Z, G4double cut)

virtual G4double	ComputeDMicroscopicCrossSection (G4double tkin, G4double Z, G4double pairEnergy)

virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)

void	SetCurrentElement (G4double Z)

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
const G4ParticleDefinition *	particle

G4NistManager *	nist

G4double	factorForCross

G4double	sqrte

G4double	particleMass

G4double	currentZ

G4double	z13

G4double	z23

G4double	lnZ

Protected Attributes inherited from G4VEmModel
G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

Static Protected Attributes
static G4double	xgi [8]

static G4double	wgi [8]

Detailed Description

Definition at line 71 of file G4MuPairProductionModel.hh.

Constructor & Destructor Documentation

◆ G4MuPairProductionModel()

G4MuPairProductionModel::G4MuPairProductionModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	nam = `"muPairProd"`
	)

Definition at line 104 of file G4MuPairProductionModel.cc.

  : G4VEmModel(nam),
    particle(0),
    factorForCross(4.*fine_structure_const*fine_structure_const
                   *classic_electr_radius*classic_electr_radius/(3.*pi)),
    sqrte(sqrt(exp(1.))),
    currentZ(0),
    fParticleChange(0),
    minPairEnergy(4.*electron_mass_c2),
    lowestKinEnergy(GeV),
    nzdat(5),
    ntdat(8),
    nbiny(1000),
    nmaxElements(0),
    ymin(-5.),
    ymax(0.),
    dy((ymax-ymin)/nbiny),
    samplingTablesAreFilled(false)
{
  SetLowEnergyLimit(minPairEnergy);
  nist = G4NistManager::Instance();
 
  theElectron = G4Electron::Electron();
  thePositron = G4Positron::Positron();
 
  particleMass = lnZ = z13 = z23 = 0;
 
  for(size_t i=0; i<1001; ++i) { ya[i] = 0.0; }
 
  if(p) { SetParticle(p); }
}

◆ ~G4MuPairProductionModel()

G4MuPairProductionModel::~G4MuPairProductionModel ( )

virtual

Definition at line 139 of file G4MuPairProductionModel.cc.

140{}

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4MuPairProductionModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	Z,
		G4double	A,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 385 of file G4MuPairProductionModel.cc.

{
  G4double cross = 0.0;
  if (kineticEnergy <= lowestKinEnergy) { return cross; }
 
  SetCurrentElement(Z);
 
  G4double maxPairEnergy = MaxSecondaryEnergy(particle,kineticEnergy);
  G4double tmax = std::min(maxEnergy, maxPairEnergy);
  G4double cut  = std::max(cutEnergy, minPairEnergy);
  if (cut >= tmax) return cross;
 
  cross = ComputeMicroscopicCrossSection (kineticEnergy, Z, cut);
  if(tmax < kineticEnergy) {
    cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
  }
  return cross;
}

◆ ComputeDEDXPerVolume()

G4double G4MuPairProductionModel::ComputeDEDXPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 173 of file G4MuPairProductionModel.cc.

{
  G4double dedx = 0.0;
  if (cutEnergy <= minPairEnergy || kineticEnergy <= lowestKinEnergy)
    { return dedx; }
 
  const G4ElementVector* theElementVector = material->GetElementVector();
  const G4double* theAtomicNumDensityVector =
                                   material->GetAtomicNumDensityVector();
 
  //  loop for elements in the material
  for (size_t i=0; i<material->GetNumberOfElements(); ++i) {
     G4double Z = (*theElementVector)[i]->GetZ();
     SetCurrentElement(Z);
     G4double tmax = MaxSecondaryEnergy(particle, kineticEnergy);
     G4double loss = ComputMuPairLoss(Z, kineticEnergy, cutEnergy, tmax);
     dedx += loss*theAtomicNumDensityVector[i];
  }
  if (dedx < 0.) { dedx = 0.; }
  return dedx;
}

◆ ComputeDMicroscopicCrossSection()

G4double G4MuPairProductionModel::ComputeDMicroscopicCrossSection	(	G4double	tkin,
		G4double	Z,
		G4double	pairEnergy
	)

protectedvirtual

Reimplemented in G4hPairProductionModel.

Definition at line 274 of file G4MuPairProductionModel.cc.

{
  G4double bbbtf= 183. ;
  G4double bbbh = 202.4 ;
  G4double g1tf = 1.95e-5 ;
  G4double g2tf = 5.3e-5 ;
  G4double g1h  = 4.4e-5 ;
  G4double g2h  = 4.8e-5 ;
 
  G4double totalEnergy  = tkin + particleMass;
  G4double residEnergy  = totalEnergy - pairEnergy;
  G4double massratio    = particleMass/electron_mass_c2 ;
  G4double massratio2   = massratio*massratio ;
  G4double cross = 0.;
 
  SetCurrentElement(Z);
 
  G4double c3 = 0.75*sqrte*particleMass;
  if (residEnergy <= c3*z13) { return cross; }
 
  G4double c7 = 4.*electron_mass_c2;
  G4double c8 = 6.*particleMass*particleMass;
  G4double alf = c7/pairEnergy;
  G4double a3 = 1. - alf;
  if (a3 <= 0.) { return cross; }
 
  // zeta calculation
  G4double bbb,g1,g2;
  if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = g2h ; }
  else          { bbb = bbbtf; g1 = g1tf; g2 = g2tf; }
 
  G4double zeta = 0;
  G4double zeta1 = 0.073*log(totalEnergy/(particleMass+g1*z23*totalEnergy))-0.26;
  if ( zeta1 > 0.)
  {
    G4double zeta2 = 0.058*log(totalEnergy/(particleMass+g2*z13*totalEnergy))-0.14;
    zeta  = zeta1/zeta2 ;
  }
 
  G4double z2 = Z*(Z+zeta);
  G4double screen0 = 2.*electron_mass_c2*sqrte*bbb/(z13*pairEnergy);
  G4double a0 = totalEnergy*residEnergy;
  G4double a1 = pairEnergy*pairEnergy/a0;
  G4double bet = 0.5*a1;
  G4double xi0 = 0.25*massratio2*a1;
  G4double del = c8/a0;
 
  G4double rta3 = sqrt(a3);
  G4double tmnexp = alf/(1. + rta3) + del*rta3;
  if(tmnexp >= 1.0) return cross;
 
  G4double tmn = log(tmnexp);
  G4double sum = 0.;
 
  // Gaussian integration in ln(1-ro) ( with 8 points)
  for (G4int i=0; i<8; ++i)
  {
    G4double a4 = exp(tmn*xgi[i]);     // a4 = (1.-asymmetry)
    G4double a5 = a4*(2.-a4) ;
    G4double a6 = 1.-a5 ;
    G4double a7 = 1.+a6 ;
    G4double a9 = 3.+a6 ;
    G4double xi = xi0*a5 ;
    G4double xii = 1./xi ;
    G4double xi1 = 1.+xi ;
    G4double screen = screen0*xi1/a5 ;
    G4double yeu = 5.-a6+4.*bet*a7 ;
    G4double yed = 2.*(1.+3.*bet)*log(3.+xii)-a6-a1*(2.-a6) ;
    G4double ye1 = 1.+yeu/yed ;
    G4double ale=log(bbb/z13*sqrt(xi1*ye1)/(1.+screen*ye1)) ;
    G4double cre = 0.5*log(1.+2.25*z23*xi1*ye1/massratio2) ;
    G4double be;
 
    if (xi <= 1.e3) be = ((2.+a6)*(1.+bet)+xi*a9)*log(1.+xii)+(a5-bet)/xi1-a9;
    else            be = (3.-a6+a1*a7)/(2.*xi);
 
    G4double fe = (ale-cre)*be;
    if ( fe < 0.) fe = 0. ;
 
    G4double ymu = 4.+a6 +3.*bet*a7 ;
    G4double ymd = a7*(1.5+a1)*log(3.+xi)+1.-1.5*a6 ;
    G4double ym1 = 1.+ymu/ymd ;
    G4double alm_crm = log(bbb*massratio/(1.5*z23*(1.+screen*ym1)));
    G4double a10,bm;
    if ( xi >= 1.e-3)
    {
      a10 = (1.+a1)*a5 ;
      bm  = (a7*(1.+1.5*bet)-a10*xii)*log(xi1)+xi*(a5-bet)/xi1+a10;
    } else {
      bm = (5.-a6+bet*a9)*(xi/2.);
    }
 
    G4double fm = alm_crm*bm;
    if ( fm < 0.) fm = 0. ;
 
    sum += wgi[i]*a4*(fe+fm/massratio2);
  }
 
  cross = -tmn*sum*factorForCross*z2*residEnergy/(totalEnergy*pairEnergy);
 
  return cross;
}

Referenced by ComputeMicroscopicCrossSection(), and ComputMuPairLoss().

◆ ComputeMicroscopicCrossSection()

G4double G4MuPairProductionModel::ComputeMicroscopicCrossSection	(	G4double	tkin,
		G4double	Z,
		G4double	cut
	)

protected

Definition at line 240 of file G4MuPairProductionModel.cc.

{
  G4double cross = 0.;
  SetCurrentElement(Z);
  G4double tmax = MaxSecondaryEnergy(particle, tkin);
  if (tmax <= cut) { return cross; }
 
  G4double ak1=6.9 ;
  G4double ak2=1.0 ;
  G4double aaa = log(cut);
  G4double bbb = log(tmax);
  G4int kkk = (G4int)((bbb-aaa)/ak1 + ak2);
  if(kkk > 8) { kkk = 8; }
  G4double hhh = (bbb-aaa)/G4double(kkk);
  G4double x = aaa;
 
  for(G4int l=0; l<kkk; ++l)
  {
    for(G4int i=0; i<8; ++i)
    {
      G4double ep = exp(x + xgi[i]*hhh);
      cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
    }
    x += hhh;
  }
 
  cross *= hhh;
  if(cross < 0.0) { cross = 0.0; }
  return cross;
}

Referenced by ComputeCrossSectionPerAtom().

◆ ComputMuPairLoss()

G4double G4MuPairProductionModel::ComputMuPairLoss	(	G4double	Z,
		G4double	tkin,
		G4double	cut,
		G4double	tmax
	)

protected

Definition at line 201 of file G4MuPairProductionModel.cc.

{
  SetCurrentElement(Z);
  G4double loss = 0.0;
 
  G4double cut = std::min(cutEnergy,tmax);
  if(cut <= minPairEnergy) { return loss; }
 
  // calculate the rectricted loss
  // numerical integration in log(PairEnergy)
  G4double ak1=6.9;
  G4double ak2=1.0;
  G4double aaa = log(minPairEnergy);
  G4double bbb = log(cut);
  G4int    kkk = (G4int)((bbb-aaa)/ak1+ak2);
  if (kkk > 8) kkk = 8;
  G4double hhh = (bbb-aaa)/(G4double)kkk;
  G4double x = aaa;
 
  for (G4int l=0 ; l<kkk; l++)
  {
 
    for (G4int ll=0; ll<8; ll++)
    {
      G4double ep = exp(x+xgi[ll]*hhh);
      loss += wgi[ll]*ep*ep*ComputeDMicroscopicCrossSection(tkin, Z, ep);
    }
    x += hhh;
  }
  loss *= hhh;
  if (loss < 0.) loss = 0.;
  return loss;
}

Referenced by ComputeDEDXPerVolume().

◆ Initialise()

void G4MuPairProductionModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &
	)

virtual

Implements G4VEmModel.

Definition at line 161 of file G4MuPairProductionModel.cc.

{ 
  if (!samplingTablesAreFilled) {
    if(p) { SetParticle(p); }
    MakeSamplingTables();
  }
  if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
}

◆ MaxSecondaryEnergy()

G4double G4MuPairProductionModel::MaxSecondaryEnergy	(	const G4ParticleDefinition *	,
		G4double	kineticEnergy
	)

protectedvirtual

Reimplemented from G4VEmModel.

Definition at line 152 of file G4MuPairProductionModel.cc.

{
  G4double maxPairEnergy = kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13);
  return maxPairEnergy;
}

Referenced by ComputeCrossSectionPerAtom(), ComputeDEDXPerVolume(), ComputeMicroscopicCrossSection(), and SampleSecondaries().

◆ MinEnergyCut()

G4double G4MuPairProductionModel::MinEnergyCut	(	const G4ParticleDefinition *	,
		const G4MaterialCutsCouple *
	)

virtual

Definition at line 144 of file G4MuPairProductionModel.cc.

{
  return minPairEnergy;
}

◆ SampleSecondaries()

void G4MuPairProductionModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	aDynamicParticle,
		G4double	tmin,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Definition at line 466 of file G4MuPairProductionModel.cc.

{
  G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
  G4double totalEnergy   = kineticEnergy + particleMass;
  G4double totalMomentum = 
    sqrt(kineticEnergy*(kineticEnergy + 2.0*particleMass));
 
  G4ThreeVector partDirection = aDynamicParticle->GetMomentumDirection();
 
  G4int it;
  for(it=1; it<ntdat; ++it) { if(kineticEnergy <= tdat[it]) { break; } }
  if(it == ntdat) { --it; }
  G4double dt = log(kineticEnergy/tdat[it-1])/log(tdat[it]/tdat[it-1]);
 
  // select randomly one element constituing the material
  const G4Element* anElement = 
    SelectRandomAtom(kineticEnergy, dt, it, couple, tmin);
  SetCurrentElement(anElement->GetZ());
 
  // define interval of enegry transfer
  G4double maxPairEnergy = MaxSecondaryEnergy(particle,kineticEnergy);
  G4double maxEnergy     = std::min(tmax, maxPairEnergy);
  G4double minEnergy     = std::max(tmin, minPairEnergy);
 
  if(minEnergy >= maxEnergy) { return; }
  //G4cout << "emin= " << minEnergy << " emax= " << maxEnergy 
  //     << " minPair= " << minPairEnergy << " maxpair= " << maxPairEnergy 
  //       << " ymin= " << ymin << " dy= " << dy << G4endl;
 
  G4double logmaxmin = log(maxPairEnergy/minPairEnergy);
 
  // select bins
  G4int iymin = 0;
  G4int iymax = nbiny-1;
  if( minEnergy > minPairEnergy)
  {
    G4double xc = log(minEnergy/minPairEnergy)/logmaxmin;
    iymin = (G4int)((log(xc) - ymin)/dy);
    if(iymin >= nbiny) iymin = nbiny-1;
    else if(iymin < 0) iymin = 0;
    xc = log(maxEnergy/minPairEnergy)/logmaxmin;
    iymax = (G4int)((log(xc) - ymin)/dy) + 1;
    if(iymax >= nbiny) iymax = nbiny-1;
    else if(iymax < 0) iymax = 0;
  }
 
  // sample e-e+ energy, pair energy first
  G4int iz, iy;
 
  for(iz=1; iz<nzdat; ++iz) { if(currentZ <= zdat[iz]) { break; } }
  if(iz == nzdat) { --iz; }
 
  G4double dz = log(currentZ/zdat[iz-1])/log(zdat[iz]/zdat[iz-1]);
 
  G4double pmin = InterpolatedIntegralCrossSection(dt,dz,iz,it,iymin,currentZ);
  G4double pmax = InterpolatedIntegralCrossSection(dt,dz,iz,it,iymax,currentZ);
 
  G4double p = pmin+G4UniformRand()*(pmax - pmin);
 
  // interpolate sampling vector;
  G4double p1 = pmin;
  G4double p2 = pmin;
  for(iy=iymin+1; iy<=iymax; ++iy) {
    p1 = p2;
    p2 = InterpolatedIntegralCrossSection(dt, dz, iz, it, iy, currentZ);
    if(p <= p2) { break; }
  }
  // G4cout << "iy= " << iy << " iymin= " << iymin << " iymax= " 
  //        << iymax << " Z= " << currentZ << G4endl;
  G4double y = ya[iy-1] + dy*(p - p1)/(p2 - p1);
 
  G4double PairEnergy = minPairEnergy*exp( exp(y)*logmaxmin );
               
  if(PairEnergy < minEnergy) { PairEnergy = minEnergy; }
  if(PairEnergy > maxEnergy) { PairEnergy = maxEnergy; }
 
  // sample r=(E+-E-)/PairEnergy  ( uniformly .....)
  G4double rmax =
    (1.-6.*particleMass*particleMass/(totalEnergy*(totalEnergy-PairEnergy)))
                                       *sqrt(1.-minPairEnergy/PairEnergy);
  G4double r = rmax * (-1.+2.*G4UniformRand()) ;
 
  // compute energies from PairEnergy,r
  G4double ElectronEnergy = (1.-r)*PairEnergy*0.5;
  G4double PositronEnergy = PairEnergy - ElectronEnergy;
 
  // The angle of the emitted virtual photon is sampled
  // according to the muon bremsstrahlung model
 
  G4double gam  = totalEnergy/particleMass;
  G4double gmax = gam*std::min(1.0, totalEnergy/PairEnergy - 1.0);
  G4double gmax2= gmax*gmax;
  G4double x = G4UniformRand()*gmax2/(1.0 + gmax2);
 
  G4double theta = sqrt(x/(1.0 - x))/gam;
  G4double sint  = sin(theta);
  G4double phi   = twopi * G4UniformRand() ;
  G4double dirx  = sint*cos(phi), diry = sint*sin(phi), dirz = cos(theta) ;
 
  G4ThreeVector gDirection(dirx, diry, dirz);
  gDirection.rotateUz(partDirection);
 
  // the angles of e- and e+ assumed to be the same as virtual gamma
 
  // create G4DynamicParticle object for the particle1
  G4DynamicParticle* aParticle1 = 
    new G4DynamicParticle(theElectron, gDirection, 
              ElectronEnergy - electron_mass_c2);
 
  // create G4DynamicParticle object for the particle2
  G4DynamicParticle* aParticle2 = 
    new G4DynamicParticle(thePositron, gDirection,
              PositronEnergy - electron_mass_c2);
 
  // primary change
  kineticEnergy -= (ElectronEnergy + PositronEnergy);
  fParticleChange->SetProposedKineticEnergy(kineticEnergy);
 
  partDirection *= totalMomentum;
  partDirection -= (aParticle1->GetMomentum() + aParticle2->GetMomentum());
  partDirection = partDirection.unit();
  fParticleChange->SetProposedMomentumDirection(partDirection);
 
  // add secondary
  vdp->push_back(aParticle1);
  vdp->push_back(aParticle2);
}

◆ SetCurrentElement()

void G4MuPairProductionModel::SetCurrentElement ( G4double Z )

inlineprotected

Definition at line 203 of file G4MuPairProductionModel.hh.

{
  if(Z != currentZ) {
    currentZ = Z;
    G4int iz = G4int(Z);
    z13 = nist->GetZ13(iz);
    z23 = z13*z13;
    lnZ = nist->GetLOGZ(iz);
  }
}

Referenced by ComputeCrossSectionPerAtom(), ComputeDEDXPerVolume(), G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), ComputeMicroscopicCrossSection(), ComputMuPairLoss(), and SampleSecondaries().

◆ SetLowestKineticEnergy()

void G4MuPairProductionModel::SetLowestKineticEnergy ( G4double e )

inline

Definition at line 185 of file G4MuPairProductionModel.hh.

{
  lowestKinEnergy = e;
}

◆ SetParticle()

void G4MuPairProductionModel::SetParticle ( const G4ParticleDefinition * p )

inline

Definition at line 193 of file G4MuPairProductionModel.hh.

{
  if(!particle) {
    particle = p;
    particleMass = particle->GetPDGMass();
  }
}

Referenced by G4MuPairProductionModel(), and Initialise().

Member Data Documentation

◆ currentZ

G4double G4MuPairProductionModel::currentZ

protected

Definition at line 151 of file G4MuPairProductionModel.hh.

Referenced by SampleSecondaries(), and SetCurrentElement().

◆ factorForCross

G4double G4MuPairProductionModel::factorForCross

protected

Definition at line 148 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), and ComputeDMicroscopicCrossSection().

◆ lnZ

G4double G4MuPairProductionModel::lnZ

protected

Definition at line 154 of file G4MuPairProductionModel.hh.

Referenced by G4MuPairProductionModel(), and SetCurrentElement().

◆ nist

G4NistManager* G4MuPairProductionModel::nist

protected

Definition at line 146 of file G4MuPairProductionModel.hh.

Referenced by G4MuPairProductionModel(), and SetCurrentElement().

◆ particle

const G4ParticleDefinition* G4MuPairProductionModel::particle

protected

Definition at line 145 of file G4MuPairProductionModel.hh.

Referenced by ComputeCrossSectionPerAtom(), ComputeDEDXPerVolume(), ComputeMicroscopicCrossSection(), SampleSecondaries(), and SetParticle().

◆ particleMass

G4double G4MuPairProductionModel::particleMass

protected

Definition at line 150 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), G4MuPairProductionModel(), MaxSecondaryEnergy(), SampleSecondaries(), and SetParticle().

◆ sqrte

G4double G4MuPairProductionModel::sqrte

protected

Definition at line 149 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), and MaxSecondaryEnergy().

◆ wgi

G4double G4MuPairProductionModel::wgi

staticprotected

Initial value:

={ 0.0506, 0.1112, 0.1569, 0.1813,

0.1813, 0.1569, 0.1112, 0.0506 }

Definition at line 156 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), ComputeMicroscopicCrossSection(), and ComputMuPairLoss().

◆ xgi

G4double G4MuPairProductionModel::xgi

staticprotected

Initial value:

={ 0.0199, 0.1017, 0.2372, 0.4083,

0.5917, 0.7628, 0.8983, 0.9801 }

Definition at line 156 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), ComputeMicroscopicCrossSection(), and ComputMuPairLoss().

◆ z13

G4double G4MuPairProductionModel::z13

protected

Definition at line 152 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), G4MuPairProductionModel(), MaxSecondaryEnergy(), and SetCurrentElement().

◆ z23

G4double G4MuPairProductionModel::z23

protected

Definition at line 153 of file G4MuPairProductionModel.hh.

Referenced by G4hPairProductionModel::ComputeDMicroscopicCrossSection(), ComputeDMicroscopicCrossSection(), G4MuPairProductionModel(), and SetCurrentElement().

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

Public Member Functions

Protected Member Functions

Protected Attributes

Static Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ G4MuPairProductionModel()

◆ ~G4MuPairProductionModel()

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ ComputeDEDXPerVolume()

◆ ComputeDMicroscopicCrossSection()

◆ ComputeMicroscopicCrossSection()

◆ ComputMuPairLoss()

◆ Initialise()

◆ MaxSecondaryEnergy()

◆ MinEnergyCut()

◆ SampleSecondaries()

◆ SetCurrentElement()

◆ SetLowestKineticEnergy()

◆ SetParticle()

Member Data Documentation

◆ currentZ

◆ factorForCross

◆ lnZ

◆ nist

◆ particle

◆ particleMass

◆ sqrte

◆ wgi

◆ xgi

◆ z13

◆ z23