G4NeutrinoElectronNcModel Class Reference

#include <G4NeutrinoElectronNcModel.hh>

Inheritance diagram for G4NeutrinoElectronNcModel:

Public Member Functions
	G4NeutrinoElectronNcModel (const G4String &name="nu-e-elastic")
virtual	~G4NeutrinoElectronNcModel ()
virtual G4bool	IsApplicable (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
virtual G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
G4double	SampleElectronTkin (const G4HadProjectile *aParticle)
void	SetCutEnergy (G4double ec)
G4double	GetCutEnergy ()
virtual void	ModelDescription (std::ostream &) const
Public Member Functions inherited from G4HadronElastic
	G4HadronElastic (const G4String &name="hElasticLHEP")
	~G4HadronElastic () override
G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A) override
G4double	GetSlopeCof (const G4int pdg)
void	SetLowestEnergyLimit (G4double value)
G4double	LowestEnergyLimit () const
G4double	ComputeMomentumCMS (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)
Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")
virtual	~G4HadronicInteraction ()
G4double	GetMinEnergy () const
G4double	GetMinEnergy (const G4Material *aMaterial, const G4Element *anElement) const
void	SetMinEnergy (G4double anEnergy)
void	SetMinEnergy (G4double anEnergy, const G4Element *anElement)
void	SetMinEnergy (G4double anEnergy, const G4Material *aMaterial)
G4double	GetMaxEnergy () const
G4double	GetMaxEnergy (const G4Material *aMaterial, const G4Element *anElement) const
void	SetMaxEnergy (const G4double anEnergy)
void	SetMaxEnergy (G4double anEnergy, const G4Element *anElement)
void	SetMaxEnergy (G4double anEnergy, const G4Material *aMaterial)
G4int	GetVerboseLevel () const
void	SetVerboseLevel (G4int value)
const G4String &	GetModelName () const
void	DeActivateFor (const G4Material *aMaterial)
void	ActivateFor (const G4Material *aMaterial)
void	DeActivateFor (const G4Element *anElement)
void	ActivateFor (const G4Element *anElement)
G4bool	IsBlocked (const G4Material *aMaterial) const
G4bool	IsBlocked (const G4Element *anElement) const
void	SetRecoilEnergyThreshold (G4double val)
G4double	GetRecoilEnergyThreshold () const
virtual const std::pair< G4double, G4double >	GetFatalEnergyCheckLevels () const
virtual std::pair< G4double, G4double >	GetEnergyMomentumCheckLevels () const
void	SetEnergyMomentumCheckLevels (G4double relativeLevel, G4double absoluteLevel)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	InitialiseModel ()
	G4HadronicInteraction (const G4HadronicInteraction &right)=delete
const G4HadronicInteraction &	operator= (const G4HadronicInteraction &right)=delete
G4bool	operator== (const G4HadronicInteraction &right) const =delete
G4bool	operator!= (const G4HadronicInteraction &right) const =delete

Additional Inherited Members
Protected Member Functions inherited from G4HadronicInteraction
void	SetModelName (const G4String &nam)
G4bool	IsBlocked () const
void	Block ()
Protected Attributes inherited from G4HadronElastic
G4double	pLocalTmax
G4int	secID
Protected Attributes inherited from G4HadronicInteraction
G4HadFinalState	theParticleChange
G4int	verboseLevel
G4double	theMinEnergy
G4double	theMaxEnergy
G4bool	isBlocked

Detailed Description

Definition at line 49 of file G4NeutrinoElectronNcModel.hh.

Constructor & Destructor Documentation

G4NeutrinoElectronNcModel()

G4NeutrinoElectronNcModel::G4NeutrinoElectronNcModel

(

const G4String &

name = "nu-e-elastic"

)

Definition at line 45 of file G4NeutrinoElectronNcModel.cc.

  : G4HadronElastic(name)
{
  secID = G4PhysicsModelCatalog::GetModelID( "model_" + name );
 
  SetMinEnergy( 0.0*GeV );
  SetMaxEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
  SetLowestEnergyLimit(1.e-6*eV);  
 
  theElectron = G4Electron::Electron();
  // PDG2016: sin^2 theta Weinberg
 
  fSin2tW = 0.23129; // 0.2312;
 
  fCutEnergy = 0.; // default value
}

~G4NeutrinoElectronNcModel()

G4NeutrinoElectronNcModel::~G4NeutrinoElectronNcModel ( )

virtual

Definition at line 63 of file G4NeutrinoElectronNcModel.cc.

{}

Member Function Documentation

ApplyYourself()

G4HadFinalState * G4NeutrinoElectronNcModel::ApplyYourself ( const G4HadProjectile & aTrack, G4Nucleus & targetNucleus )

virtual

Reimplemented from G4HadronElastic.

Definition at line 100 of file G4NeutrinoElectronNcModel.cc.

{
  theParticleChange.Clear();
 
  const G4HadProjectile* aParticle = &aTrack;
  G4double nuTkin = aParticle->GetKineticEnergy();
 
  if( nuTkin <= LowestEnergyLimit() ) 
  {
    theParticleChange.SetEnergyChange(nuTkin);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }
  // sample and make final state in lab frame
 
  G4double eTkin = SampleElectronTkin( aParticle );
 
  if( eTkin > fCutEnergy )
  {
    G4double ePlab = sqrt( eTkin*(eTkin + 2.*electron_mass_c2) );
 
    G4double cost2  = eTkin*(nuTkin + electron_mass_c2)*(nuTkin + electron_mass_c2);
             cost2 /= nuTkin*nuTkin*(eTkin + 2.*electron_mass_c2);
 
    if( cost2 > 1. ) cost2 = 1.;
    if( cost2 < 0. ) cost2 = 0.;
 
    G4double cost = sqrt(cost2);
    G4double sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    G4double phi  = G4UniformRand()*CLHEP::twopi;
 
    G4ThreeVector eP( sint*std::cos(phi), sint*std::sin(phi), cost );
    eP *= ePlab;
    G4LorentzVector lvt2( eP, eTkin + electron_mass_c2 );
    G4DynamicParticle * aSec = new G4DynamicParticle( theElectron, lvt2 );
    theParticleChange.AddSecondary( aSec, secID );
 
    G4LorentzVector lvp1 = aParticle->Get4Momentum();
    G4LorentzVector lvt1(0.,0.,0.,electron_mass_c2);
    G4LorentzVector lvsum = lvp1+lvt1;
 
    G4LorentzVector lvp2 = lvsum-lvt2;
    G4double nuTkin2 = lvp2.e()-aParticle->GetDefinition()->GetPDGMass();
    theParticleChange.SetEnergyChange(nuTkin2);
    theParticleChange.SetMomentumChange(lvp2.vect().unit());
  }
  else if( eTkin > 0.0 ) 
  {
    theParticleChange.SetLocalEnergyDeposit( eTkin );
    nuTkin -= eTkin;
 
    if( nuTkin > 0. )
    {
      theParticleChange.SetEnergyChange( nuTkin );
      theParticleChange.SetMomentumChange( aTrack.Get4Momentum().vect().unit() );
    }
  }
  else 
  {
    theParticleChange.SetEnergyChange( nuTkin );
    theParticleChange.SetMomentumChange( aTrack.Get4Momentum().vect().unit() );
  }
  return &theParticleChange;
}

GetCutEnergy()

G4double G4NeutrinoElectronNcModel::GetCutEnergy ( )

inline

Definition at line 68 of file G4NeutrinoElectronNcModel.hh.

{return fCutEnergy;};

IsApplicable()

G4bool G4NeutrinoElectronNcModel::IsApplicable ( const G4HadProjectile & aTrack, G4Nucleus & targetNucleus )

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 75 of file G4NeutrinoElectronNcModel.cc.

{
  G4bool result  = false;
  G4String pName = aTrack.GetDefinition()->GetParticleName();
  G4double minEnergy = 0.;
  G4double energy = aTrack.GetTotalEnergy();
 
  if( fCutEnergy > 0. ) // min detected recoil electron energy
  {
    minEnergy = 0.5*(fCutEnergy+sqrt(fCutEnergy*(fCutEnergy+2.*electron_mass_c2)));
  }
  if( ( pName == "nu_e"   || pName == "anti_nu_e"   || 
        pName == "nu_mu"  || pName == "anti_nu_nu"  || 
        pName == "nu_tau" || pName == "anti_nu_tau"   ) &&
        energy > minEnergy                                 )
  {
    result = true;
  }
  return result;
}

ModelDescription()

void G4NeutrinoElectronNcModel::ModelDescription ( std::ostream & outFile ) const

virtual

Reimplemented from G4HadronElastic.

Definition at line 66 of file G4NeutrinoElectronNcModel.cc.

{
  outFile << "G4NeutrinoElectronNcModel is a neutrino-electron (neutral current) elastic scattering\n"
      << "model which uses the standard model \n"
      << "transfer parameterization.  The model is fully relativistic\n";
}

SampleElectronTkin()

G4double G4NeutrinoElectronNcModel::SampleElectronTkin

(

const G4HadProjectile *

aParticle

)

Definition at line 170 of file G4NeutrinoElectronNcModel.cc.

{
  G4double result = 0., xi, cofL, cofR, cofL2, cofR2, cofLR;
 
  G4double energy = aParticle->GetTotalEnergy();
  if( energy == 0.) return result; // vmg: < th?? as in xsc 
 
  G4String pName  = aParticle->GetDefinition()->GetParticleName();
 
  if( pName == "nu_e")
  {
    cofL = 0.5 + fSin2tW;
    cofR = fSin2tW;
  }
  else if( pName == "anti_nu_e")
  {
    cofL = fSin2tW;
    cofR = 0.5 + fSin2tW;
  }
  else if( pName == "nu_mu")
  {
    cofL = -0.5 + fSin2tW;
    cofR = fSin2tW;
  }
  else if( pName == "anti_nu_mu")
  {
    cofL = fSin2tW;
    cofR = -0.5 + fSin2tW;
  }
  else if( pName == "nu_tau") // vmg: nu_tau as nu_mu ???
  {
    cofL = -0.5 + fSin2tW;
    cofR = fSin2tW;
  }
  else if( pName == "anti_nu_tau")
  {
    cofL = fSin2tW;
    cofR = -0.5 + fSin2tW;
  }
  else
  {
    return result;
  }
  xi = 0.5*electron_mass_c2/energy;
 
  cofL2 = cofL*cofL;
  cofR2 = cofR*cofR;
  cofLR = cofL*cofR;
 
  // cofs of Tkin/Enu 3rd equation
 
  G4double a = cofR2/3.;
  G4double b = -(cofR2+cofLR*xi);
  G4double c = cofL2+cofR2;
 
  G4double xMax  = 1./(1. + xi);
  G4double xMax2 = xMax*xMax;
  G4double xMax3 = xMax*xMax2;
 
  G4double d  = -( a*xMax3 + b*xMax2 + c*xMax );
           d *= G4UniformRand();
 
  // G4cout<<a<<"   "<<b<<"   "<<c<<"   "<<d<<G4endl<<G4endl;
 
  // cofs of the incomplete 3rd equation
 
  G4double p  = c/a;
           p -= b*b/a/a/3.;
  G4double q  = d/a;
           q -= b*c/a/a/3.;
           q += 2*b*b*b/a/a/a/27.;
 
 
  // cofs for the incomplete colutions
 
  G4double D  = p*p*p/3./3./3.;
           D += q*q/2./2.;
 
       // G4cout<<"D = "<<D<<G4endl;
       // D = -D;
       // G4complex A1 = G4complex(- q/2., std::sqrt(-D) );
       // G4complex A  = std::pow(A1,1./3.);
 
       // G4complex B1 = G4complex(- q/2., -std::sqrt(-D) );
       // G4complex B  = std::pow(B1,1./3.);
 
  G4double A1 = - q/2. + std::sqrt(D);
  G4double A = std::pow(A1,1./3.);
 
  G4double B1 = - q/2. - std::sqrt(D);
  G4double B = std::pow(-B1,1./3.);
           B = -B;
 
  // roots of the incomplete 3rd equation
 
  G4complex y1 =  A + B;
  // G4complex y2 = -0.5*(A + B) + 0.5*std::sqrt(3.)*(A - B)*G4complex(0.,1.);
  // G4complex y3 = -0.5*(A + B) - 0.5*std::sqrt(3.)*(A - B)*G4complex(0.,1.);
 
  G4complex x1 = y1 - b/a/3.;
  // G4complex x2 = y2 - b/a/3.;
  // G4complex x3 = y3 - b/a/3.;
 
  // G4cout<<"re_x1 = "<<real(x1)<<"; re_x2 = "<<real(x2)<<"; re_x3 = "<<real(x3)<<G4endl;
  // G4cout<<"im_x1 = "<<imag(x1)<<"; im_x2 = "<<imag(x2)<<"; im_x3 = "<<imag(x3)<<G4endl<<G4endl;
 
  result = real(x1)*energy;
 
  return result;
}

Referenced by ApplyYourself().

SetCutEnergy()

void G4NeutrinoElectronNcModel::SetCutEnergy ( G4double ec )

inline

Definition at line 67 of file G4NeutrinoElectronNcModel.hh.

{fCutEnergy=ec;};

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

• G4NeutrinoElectronNcModel.hh
• G4NeutrinoElectronNcModel.cc