#include <G4HadronElastic.hh>

Inheritance diagram for G4HadronElastic:

Public Member Functions
	G4HadronElastic (const G4String &name="hElasticLHEP")

	~G4HadronElastic () override

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

void	ModelDescription (std::ostream &) const override

Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")

virtual	~G4HadronicInteraction ()

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

virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)

virtual G4bool	IsApplicable (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)

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	ModelDescription (std::ostream &outFile) const

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

Protected Attributes
G4double	pLocalTmax

Protected Attributes inherited from G4HadronicInteraction
G4HadFinalState	theParticleChange

G4int	verboseLevel

G4double	theMinEnergy

G4double	theMaxEnergy

G4bool	isBlocked

Additional Inherited Members
Protected Member Functions inherited from G4HadronicInteraction
void	SetModelName (const G4String &nam)

G4bool	IsBlocked () const

void	Block ()

Detailed Description

Definition at line 48 of file G4HadronElastic.hh.

Constructor & Destructor Documentation

◆ G4HadronElastic()

G4HadronElastic::G4HadronElastic ( const G4String & name = "hElasticLHEP" )

explicit

Definition at line 48 of file G4HadronElastic.cc.

  : G4HadronicInteraction(name)
{
  SetMinEnergy( 0.0*GeV );
  SetMaxEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
  lowestEnergyLimit= 1.e-6*eV;
  pLocalTmax  = 0.0;
  nwarn = 0;
 
  theProton   = G4Proton::Proton();
  theNeutron  = G4Neutron::Neutron();
  theDeuteron = G4Deuteron::Deuteron();
  theAlpha    = G4Alpha::Alpha();
}

◆ ~G4HadronElastic()

G4HadronElastic::~G4HadronElastic ( )

override

Definition at line 63 of file G4HadronElastic.cc.

64{}

Member Function Documentation

◆ ApplyYourself()

G4HadFinalState * G4HadronElastic::ApplyYourself	(	const G4HadProjectile &	aTrack,
		G4Nucleus &	targetNucleus
	)

overridevirtual

Reimplemented from G4HadronicInteraction.

Reimplemented in G4LEHadronProtonElastic, G4NeutrinoElectronNcModel, G4NeutronElectronElModel, G4LEnp, and G4LEpp.

Definition at line 78 of file G4HadronElastic.cc.

{
  theParticleChange.Clear();
 
  const G4HadProjectile* aParticle = &aTrack;
  G4double ekin = aParticle->GetKineticEnergy();
 
  // no scattering below the limit
  if(ekin <= lowestEnergyLimit) {
    theParticleChange.SetEnergyChange(ekin);
    theParticleChange.SetMomentumChange(0.,0.,1.);
    return &theParticleChange;
  }
 
  G4int A = targetNucleus.GetA_asInt();
  G4int Z = targetNucleus.GetZ_asInt();
 
  // Scattered particle referred to axis of incident particle
  const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
  G4double m1 = theParticle->GetPDGMass();
  G4double plab = std::sqrt(ekin*(ekin + 2.0*m1));
 
  if (verboseLevel>1) {
    G4cout << "G4HadronElastic: " 
       << aParticle->GetDefinition()->GetParticleName() 
       << " Plab(GeV/c)= " << plab/GeV  
       << " Ekin(MeV) = " << ekin/MeV 
       << " scattered off Z= " << Z 
       << " A= " << A 
       << G4endl;
  }
 
  G4double mass2 = G4NucleiProperties::GetNuclearMass(A, Z);
  G4double e1 = m1 + ekin;
  G4LorentzVector lv(0.0,0.0,plab,e1+mass2);
  G4ThreeVector bst = lv.boostVector();
  G4double momentumCMS = plab*mass2/std::sqrt(m1*m1 + mass2*mass2 + 2.*mass2*e1);
 
  pLocalTmax = 4.0*momentumCMS*momentumCMS;
 
  // Sampling in CM system
  G4double t = SampleInvariantT(theParticle, plab, Z, A);
 
  if(t < 0.0 || t > pLocalTmax) {
    // For the very rare cases where cos(theta) is greater than 1 or smaller than -1,
    // print some debugging information via a "JustWarning" exception, and resample
    // using the default algorithm
#ifdef G4VERBOSE
    if(nwarn < 2) {
      G4ExceptionDescription ed;
      ed << GetModelName() << " wrong sampling t= " << t << " tmax= " << pLocalTmax
     << " for " << aParticle->GetDefinition()->GetParticleName() 
     << " ekin=" << ekin << " MeV" 
     << " off (Z,A)=(" << Z << "," << A << ") - will be resampled" << G4endl;
      G4Exception( "G4HadronElastic::ApplyYourself", "hadEla001", JustWarning, ed);
      ++nwarn;
    }
#endif
    t = G4HadronElastic::SampleInvariantT(theParticle, plab, Z, A);
  }
 
  G4double phi  = G4UniformRand()*CLHEP::twopi;
  G4double cost = 1. - 2.0*t/pLocalTmax;
 
  if (cost > 1.0) { cost = 1.0; }
  else if(cost < -1.0) { cost = -1.0; } 
 
  G4double sint = std::sqrt((1.0-cost)*(1.0+cost));
 
  if (verboseLevel>1) {
    G4cout << " t= " << t << " tmax(GeV^2)= " << pLocalTmax/(GeV*GeV) 
       << " Pcms(GeV)= " << momentumCMS/GeV << " cos(t)=" << cost 
       << " sin(t)=" << sint << G4endl;
  }
  G4LorentzVector nlv1(momentumCMS*sint*std::cos(phi),
               momentumCMS*sint*std::sin(phi),
                       momentumCMS*cost,
               std::sqrt(momentumCMS*momentumCMS + m1*m1));
 
  nlv1.boost(bst); 
 
  G4double eFinal = nlv1.e() - m1;
  if (verboseLevel > 1) {
    G4cout <<"G4HadronElastic: m= " << m1 << " Efin(MeV)= " << eFinal 
       << " 4-M Final: " << nlv1 
       << G4endl;
  }
 
  if(eFinal <= 0.0) { 
    theParticleChange.SetMomentumChange(0.0,0.0,1.0);
    theParticleChange.SetEnergyChange(0.0);
  } else {
    theParticleChange.SetMomentumChange(nlv1.vect().unit());
    theParticleChange.SetEnergyChange(eFinal);
  }
  lv -= nlv1;
  G4double erec =  std::max(lv.e() - mass2, 0.0);
  if (verboseLevel > 1) {
    G4cout << "Recoil: " <<" m= " << mass2 << " Erec(MeV)= " << erec
       << " 4-mom: " << lv 
       << G4endl;
  }
 
  // the recoil is created if kinetic energy above the threshold
  if(erec > GetRecoilEnergyThreshold()) {
    G4ParticleDefinition * theDef = nullptr;
    if(Z == 1 && A == 1)       { theDef = theProton; }
    else if (Z == 1 && A == 2) { theDef = theDeuteron; }
    else if (Z == 1 && A == 3) { theDef = G4Triton::Triton(); }
    else if (Z == 2 && A == 3) { theDef = G4He3::He3(); }
    else if (Z == 2 && A == 4) { theDef = theAlpha; }
    else {
      theDef = 
    G4ParticleTable::GetParticleTable()->GetIonTable()->GetIon(Z,A,0.0);
    }
    G4DynamicParticle * aSec = new G4DynamicParticle(theDef, lv.vect().unit(), erec);
    theParticleChange.AddSecondary(aSec);
  } else {
    theParticleChange.SetLocalEnergyDeposit(erec);
  }
 
  return &theParticleChange;
}

◆ ComputeMomentumCMS()

G4double G4HadronElastic::ComputeMomentumCMS	(	const G4ParticleDefinition *	p,
		G4double	plab,
		G4int	Z,
		G4int	A
	)

inline

Definition at line 101 of file G4HadronElastic.hh.

{
  G4double m1 = p->GetPDGMass();
  G4double m12= m1*m1;
  G4double mass2 = G4NucleiProperties::GetNuclearMass(A, Z);
  return plab*mass2/std::sqrt(m12 + mass2*mass2 + 2.*mass2*std::sqrt(m12 + plab*plab));
}

◆ GetSlopeCof()

G4double G4HadronElastic::GetSlopeCof ( const G4int pdg )

Definition at line 274 of file G4HadronElastic.cc.

{
  // The input parameter "pdg" should be the absolute value of the PDG code
  // (i.e. the same value for a particle and its antiparticle).
 
  G4double coeff = 1.0;
 
  // heavy barions
 
  static const G4double  lBarCof1S  = 0.88;
  static const G4double  lBarCof2S  = 0.76;
  static const G4double  lBarCof3S  = 0.64;
  static const G4double  lBarCof1C  = 0.784378;
  static const G4double  lBarCofSC  = 0.664378;
  static const G4double  lBarCof2SC = 0.544378;
  static const G4double  lBarCof1B  = 0.740659;
  static const G4double  lBarCofSB  = 0.620659;
  static const G4double  lBarCof2SB = 0.500659;
  
  if( pdg == 3122 || pdg == 3222 ||  pdg == 3112 || pdg == 3212  )
  {
    coeff = lBarCof1S; // Lambda, Sigma+, Sigma-, Sigma0
 
  } else if( pdg == 3322 || pdg == 3312   )
  {
    coeff = lBarCof2S; // Xi-, Xi0
  }
  else if( pdg == 3324)
  {
    coeff = lBarCof3S; // Omega
  }
  else if( pdg == 4122 ||  pdg == 4212 ||   pdg == 4222 ||   pdg == 4112   )
  {
    coeff = lBarCof1C; // LambdaC+, SigmaC+, SigmaC++, SigmaC0
  }
  else if( pdg == 4332 )
  {
    coeff = lBarCof2SC; // OmegaC
  }
  else if( pdg == 4232 || pdg == 4132 )
  {
    coeff = lBarCofSC; // XiC+, XiC0
  }
  else if( pdg == 5122 || pdg == 5222 || pdg == 5112 || pdg == 5212    )
  {
    coeff = lBarCof1B; // LambdaB, SigmaB+, SigmaB-, SigmaB0
  }
  else if( pdg == 5332 )
  {
    coeff = lBarCof2SB; // OmegaB-
  }
  else if( pdg == 5132 || pdg == 5232 ) // XiB-, XiB0
  {
    coeff = lBarCofSB;
  }
  // heavy mesons Kaons?
  static const G4double lMesCof1S = 0.82; // Kp/piP kaons?
  static const G4double llMesCof1C = 0.676568;
  static const G4double llMesCof1B = 0.610989;
  static const G4double llMesCof2C = 0.353135;
  static const G4double llMesCof2B = 0.221978;
  static const G4double llMesCofSC = 0.496568;
  static const G4double llMesCofSB = 0.430989;
  static const G4double llMesCofCB = 0.287557;
  static const G4double llMesCofEtaP = 0.88;
  static const G4double llMesCofEta = 0.76;
 
  if( pdg == 321 || pdg == 311 || pdg == 310 )
  {
    coeff = lMesCof1S; //K+-0
  }
  else if( pdg == 511 ||  pdg == 521  )
  {
    coeff = llMesCof1B; // BMeson0, BMeson+
  }
  else if(pdg == 421 ||  pdg == 411 )
  {
    coeff = llMesCof1C; // DMeson+, DMeson0
  }
  else if( pdg == 531  )
  {
    coeff = llMesCofSB; // BSMeson0
  }
  else if( pdg == 541 )
  {
    coeff = llMesCofCB; // BCMeson+-
  }
  else if(pdg == 431 ) 
  {
    coeff = llMesCofSC; // DSMeson+-
  }
  else if(pdg == 441 || pdg == 443 )
  {
    coeff = llMesCof2C; // Etac, JPsi
  }
  else if(pdg == 553 )
  {
    coeff = llMesCof2B; // Upsilon
  }
  else if(pdg == 221 )
  {
    coeff = llMesCofEta; // Eta
  }
  else if(pdg == 331 )
  {
    coeff = llMesCofEtaP; // Eta'
  } 
  return coeff;
}

◆ LowestEnergyLimit()

G4double G4HadronElastic::LowestEnergyLimit ( ) const

inline

Definition at line 95 of file G4HadronElastic.hh.

{
  return lowestEnergyLimit;
}

Referenced by G4NeutrinoElectronNcModel::ApplyYourself(), and G4NeutronElectronElModel::ApplyYourself().

◆ ModelDescription()

void G4HadronElastic::ModelDescription ( std::ostream & outFile ) const

overridevirtual

Reimplemented from G4HadronicInteraction.

Reimplemented in G4NeutrinoElectronNcModel, and G4NeutronElectronElModel.

Definition at line 67 of file G4HadronElastic.cc.

{
  outFile << "G4HadronElastic is the base class for all hadron-nucleus\n" 
          << "elastic scattering models except HP.\n" 
          << "By default it uses the Gheisha two-exponential momentum\n"
      << "transfer parameterization.  The model is fully relativistic\n"
      << "as opposed to the original Gheisha model which was not.\n"
      << "This model may be used for all long-lived hadrons at all\n"
      << "incident energies but fit the data only for relativistic scattering.\n";
}

◆ SampleInvariantT()

G4double G4HadronElastic::SampleInvariantT	(	const G4ParticleDefinition *	p,
		G4double	plab,
		G4int	Z,
		G4int	A
	)

overridevirtual

Reimplemented from G4HadronicInteraction.

Reimplemented in G4LEHadronProtonElastic, G4NuclNuclDiffuseElastic, G4LEnp, G4LEpp, G4LowEHadronElastic, and G4hhElastic.

Definition at line 205 of file G4HadronElastic.cc.

{
  const G4double plabLowLimit = 400.0*CLHEP::MeV;
  const G4double GeV2 = GeV*GeV;
  const G4double z07in13 = std::pow(0.7, 0.3333333333);
  const G4double numLimit = 18.;
 
  G4int pdg = std::abs(part->GetPDGEncoding());
  G4double tmax = pLocalTmax/GeV2;
 
  G4double aa, bb, cc, dd;
  G4Pow* g4pow = G4Pow::GetInstance();
  if (A <= 62) {
    if (pdg == 211){ //Pions
      if(mom >= plabLowLimit){     //High energy
    bb = 14.5*g4pow->Z23(A);/*14.5*/
    dd = 10.;
    cc = 0.075*g4pow->Z13(A)/dd;//1.4
    //aa = g4pow->powZ(A, 1.93)/bb;//1.63
    aa = (A*A)/bb;//1.63
      } else {                       //Low energy
    bb = 29.*z07in13*z07in13*g4pow->Z23(A);
    dd = 15.;
    cc = 0.04*g4pow->Z13(A)/dd;//1.4
    aa = g4pow->powZ(A, 1.63)/bb;//1.63
      }
    } else { //Other particles
      bb = 14.5*g4pow->Z23(A);
      dd = 20.;
      aa = (A*A)/bb;//1.63
      cc = 1.4*g4pow->Z13(A)/dd;          
    }
      //===========================
  } else { //(A>62)
    if (pdg == 211) {
      if(mom >= plabLowLimit){ //high
    bb = 60.*z07in13*g4pow->Z13(A);//60
    dd = 30.;
    aa = 0.5*(A*A)/bb;//1.33
    cc = 4.*g4pow->powZ(A,0.4)/dd;//1:0.4     ---    2: 0.4
      } else { //low
    bb = 120.*z07in13*g4pow->Z13(A);//60
    dd = 30.;
    aa = 2.*g4pow->powZ(A,1.33)/bb;
    cc = 4.*g4pow->powZ(A,0.4)/dd;//1:0.4     ---    2: 0.4
      }
    } else {
      bb = 60.*g4pow->Z13(A);
      dd = 25.;
      aa = g4pow->powZ(A,1.33)/bb;//1.33
      cc = 0.2*g4pow->powZ(A,0.4)/dd;//1:0.4     ---    2: 0.4
    }
  }
  G4double q1 = 1.0 - G4Exp(-std::min(bb*tmax, numLimit));
  G4double q2 = 1.0 - G4Exp(-std::min(dd*tmax, numLimit));
  G4double s1 = q1*aa;
  G4double s2 = q2*cc;
  if((s1 + s2)*G4UniformRand() < s2) {
    q1 = q2;
    bb = dd;
  }
  return -GeV2*G4Log(1.0 - G4UniformRand()*q1)/bb;
}

Referenced by ApplyYourself(), G4ChipsElasticModel::SampleInvariantT(), G4ElasticHadrNucleusHE::SampleInvariantT(), and G4LowEHadronElastic::SampleInvariantT().

◆ SetLowestEnergyLimit()

void G4HadronElastic::SetLowestEnergyLimit ( G4double value )

inline

Definition at line 90 of file G4HadronElastic.hh.

{
  lowestEnergyLimit = value;
}

Referenced by G4NeutrinoElectronNcModel::G4NeutrinoElectronNcModel(), and G4NeutronElectronElModel::G4NeutronElectronElModel().

Member Data Documentation

◆ pLocalTmax

G4double G4HadronElastic::pLocalTmax

protected

Definition at line 77 of file G4HadronElastic.hh.

Referenced by ApplyYourself(), G4HadronElastic(), G4ElasticHadrNucleusHE::SampleInvariantT(), SampleInvariantT(), and G4LowEHadronElastic::SampleInvariantT().

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

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4HadronElastic()

◆ ~G4HadronElastic()

Member Function Documentation

◆ ApplyYourself()

◆ ComputeMomentumCMS()

◆ GetSlopeCof()

◆ LowestEnergyLimit()

◆ ModelDescription()

◆ SampleInvariantT()

◆ SetLowestEnergyLimit()

Member Data Documentation

◆ pLocalTmax