G4LElastic Class Reference

#include <G4LElastic.hh>

Inheritance diagram for G4LElastic:

Public Member Functions
	G4LElastic (const G4String &name="G4LElastic")
	~G4LElastic ()
G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
virtual void	ModelDescription (std::ostream &outFile) const
virtual const std::pair< G4double, G4double >	GetFatalEnergyCheckLevels () const
Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")
virtual	~G4HadronicInteraction ()
virtual G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)=0
virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)
virtual G4bool	IsApplicable (const G4HadProjectile &, G4Nucleus &)
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)
const G4HadronicInteraction *	GetMyPointer () const
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
G4bool	operator== (const G4HadronicInteraction &right) const
G4bool	operator!= (const G4HadronicInteraction &right) 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

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

Detailed Description

Definition at line 61 of file G4LElastic.hh.

Constructor & Destructor Documentation

G4LElastic()

G4LElastic::G4LElastic

(

const G4String &

name = "G4LElastic"

)

Definition at line 47 of file G4LElastic.cc.

 :G4HadronicInteraction(name)
{
  SetMinEnergy(0.0);
  SetMaxEnergy(DBL_MAX);
}

~G4LElastic()

G4LElastic::~G4LElastic ( )

inline

Definition at line 67 of file G4LElastic.hh.

{};

Member Function Documentation

ApplyYourself()

G4HadFinalState * G4LElastic::ApplyYourself ( const G4HadProjectile &  aTrack, G4Nucleus &  targetNucleus  )

virtual

Implements G4HadronicInteraction.

Definition at line 68 of file G4LElastic.cc.

{
  if(getenv("debug_LElastic")) verboseLevel = 5;
  theParticleChange.Clear();
  const G4HadProjectile* aParticle = &aTrack;
  G4double atno2 = targetNucleus.GetA_asInt();
  G4double zTarget = targetNucleus.GetZ_asInt();
  theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy());
  theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
 
  // Elastic scattering off Hydrogen
 
  G4DynamicParticle* aSecondary = 0;
  if (atno2 < 1.5) {
    const G4ParticleDefinition* aParticleType = aParticle->GetDefinition();
    if (aParticleType == G4PionPlus::PionPlus())
       aSecondary = LightMedia.PionPlusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4PionMinus::PionMinus())
       aSecondary = LightMedia.PionMinusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4KaonPlus::KaonPlus())
       aSecondary = LightMedia.KaonPlusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4KaonZeroShort::KaonZeroShort())
       aSecondary = LightMedia.KaonZeroShortExchange(aParticle,targetNucleus);
    else if (aParticleType == G4KaonZeroLong::KaonZeroLong())
       aSecondary = LightMedia.KaonZeroLongExchange(aParticle, targetNucleus);
    else if (aParticleType == G4KaonMinus::KaonMinus())
       aSecondary = LightMedia.KaonMinusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4Proton::Proton())
       aSecondary = LightMedia.ProtonExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiProton::AntiProton())
       aSecondary = LightMedia.AntiProtonExchange(aParticle, targetNucleus);
    else if (aParticleType == G4Neutron::Neutron())
       aSecondary = LightMedia.NeutronExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiNeutron::AntiNeutron())
       aSecondary = LightMedia.AntiNeutronExchange(aParticle, targetNucleus);
    else if (aParticleType == G4Lambda::Lambda())
       aSecondary = LightMedia.LambdaExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiLambda::AntiLambda())
       aSecondary = LightMedia.AntiLambdaExchange(aParticle, targetNucleus);
    else if (aParticleType == G4SigmaPlus::SigmaPlus())
       aSecondary = LightMedia.SigmaPlusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4SigmaMinus::SigmaMinus())
       aSecondary = LightMedia.SigmaMinusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiSigmaPlus::AntiSigmaPlus())
       aSecondary = LightMedia.AntiSigmaPlusExchange(aParticle,targetNucleus);
    else if (aParticleType == G4AntiSigmaMinus::AntiSigmaMinus())
       aSecondary= LightMedia.AntiSigmaMinusExchange(aParticle,targetNucleus);
    else if (aParticleType == G4XiZero::XiZero())
       aSecondary = LightMedia.XiZeroExchange(aParticle, targetNucleus);
    else if (aParticleType == G4XiMinus::XiMinus())
       aSecondary = LightMedia.XiMinusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiXiZero::AntiXiZero())
       aSecondary = LightMedia.AntiXiZeroExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiXiMinus::AntiXiMinus())
       aSecondary = LightMedia.AntiXiMinusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4OmegaMinus::OmegaMinus())
       aSecondary = LightMedia.OmegaMinusExchange(aParticle, targetNucleus);
    else if (aParticleType == G4AntiOmegaMinus::AntiOmegaMinus())
       aSecondary= LightMedia.AntiOmegaMinusExchange(aParticle,targetNucleus);
    else if (aParticleType == G4KaonPlus::KaonPlus())
       aSecondary = LightMedia.KaonPlusExchange(aParticle, targetNucleus);
  }
 
  // Has a charge or strangeness exchange occurred?
   if (aSecondary) {
      aSecondary->SetMomentum(aParticle->Get4Momentum().vect());
      theParticleChange.SetStatusChange(stopAndKill);
      theParticleChange.AddSecondary(aSecondary);
   }
   // G4cout << "Entering elastic scattering 1"<<G4endl;
 
   G4double p = aParticle->GetTotalMomentum()/GeV;
   if (verboseLevel > 1)
      G4cout << "G4LElastic::DoIt: Incident particle p=" << p << " GeV" << G4endl;
 
   if (p < 0.01) return &theParticleChange;
 
   // G4cout << "Entering elastic scattering 2"<<G4endl;
// Compute the direction of elastic scattering.
// It is planned to replace this code with a method based on
// parameterized functions and a Monte Carlo method to invert the CDF.
 
   G4double ran = G4UniformRand();
   G4double aa, bb, cc, dd, rr;
   if (atno2 <= 62.) {
      aa = std::pow(atno2, 1.63);
      bb = 14.5*std::pow(atno2, 0.66);
      cc = 1.4*std::pow(atno2, 0.33);
      dd = 10.;
   }
   else {
      aa = std::pow(atno2, 1.33);
      bb = 60.*std::pow(atno2, 0.33);
      cc = 0.4*std::pow(atno2, 0.40);
      dd = 10.;
   }
   aa = aa/bb;
   cc = cc/dd;
   rr = (aa + cc)*ran;
   if (verboseLevel > 1) {
      G4cout << "DoIt: aa,bb,cc,dd,rr" << G4endl;
      G4cout << aa << " " << bb << " " << cc << " " << dd << " " << rr << G4endl;
   }
   G4double t1 = -std::log(ran)/bb;
   G4double t2 = -std::log(ran)/dd;
   if (verboseLevel > 1) {
      G4cout << "t1,Fctcos " << t1 << " " << Fctcos(t1, aa, bb, cc, dd, rr) << 
              G4endl;
      G4cout << "t2,Fctcos " << t2 << " " << Fctcos(t2, aa, bb, cc, dd, rr) << 
              G4endl;
   }
   G4double eps = 0.001;
   G4int ind1 = 10;
   G4double t;
   G4int ier1;
   ier1 = Rtmi(&t, t1, t2, eps, ind1,
               aa, bb, cc, dd, rr);
   if (verboseLevel > 1) {
      G4cout << "From Rtmi, ier1=" << ier1 << G4endl;
      G4cout << "t, Fctcos " << t << " " << Fctcos(t, aa, bb, cc, dd, rr) << 
              G4endl;
   }
   if (ier1 != 0) t = 0.25*(3.*t1 + t2);
   if (verboseLevel > 1) {
      G4cout << "t, Fctcos " << t << " " << Fctcos(t, aa, bb, cc, dd, rr) << 
              G4endl;
   }
   G4double phi = G4UniformRand()*twopi;
   rr = 0.5*t/(p*p);
   if (rr > 1.) rr = 0.;
   if (verboseLevel > 1)
      G4cout << "rr=" << rr << G4endl;
   G4double cost = 1. - rr;
   G4double sint = std::sqrt(std::max(rr*(2. - rr), 0.));
   if (sint == 0.) return &theParticleChange;
   // G4cout << "Entering elastic scattering 3"<<G4endl;
   if (verboseLevel > 1)
     G4cout << "cos(t)=" << cost << "  std::sin(t)=" << sint << G4endl;
 
   // Scattered particle referred to axis of incident particle
   G4double mass1 = aParticle->GetDefinition()->GetPDGMass();
   G4int Z=static_cast<G4int>(zTarget+.5);
   G4int A=static_cast<G4int>(atno2);
   if(G4UniformRand()<atno2-A) A++;
   //G4cout << " ion info "<<atno2 << " "<<A<<" "<<Z<<" "<<zTarget<<G4endl;
   G4double mass2 =
     G4ParticleTable::GetParticleTable()->FindIon(Z,A,0,Z)->GetPDGMass();
 
   // non relativistic approximation
   G4double a = 1 + mass2/mass1;
   G4double b = -2.*p*cost;
   G4double c = p*p*(1 - mass2/mass1);
   G4double p1 = (-b+std::sqrt(std::max(0.0,b*b-4.*a*c)))/(2.*a);
   G4double px = p1*sint*std::sin(phi);
   G4double py = p1*sint*std::cos(phi);
   G4double pz = p1*cost;
 
// relativistic calculation
   G4double etot = std::sqrt(mass1*mass1+p*p)+mass2;
   a = etot*etot-p*p*cost*cost;
   b = 2*p*p*(mass1*cost*cost-etot);
   c = p*p*p*p*sint*sint;
   
   G4double de = (-b-std::sqrt(std::max(0.0,b*b-4.*a*c)))/(2.*a);
   G4double e1 = std::sqrt(p*p+mass1*mass1)-de;
   G4double p12=e1*e1-mass1*mass1;
   p1 = std::sqrt(std::max(1.*eV*eV,p12));
   px = p1*sint*std::sin(phi);
   py = p1*sint*std::cos(phi);
   pz = p1*cost;
 
   if (verboseLevel > 1) 
   {
     G4cout << "Relevant test "<<p<<" "<<p1<<" "<<cost<<" "<<de<<G4endl;
     G4cout << "p1/p = "<<p1/p<<" "<<mass1<<" "<<mass2<<" "<<a<<" "<<b<<" "<<c<<G4endl;
     G4cout << "rest = "<< b*b<<" "<<4.*a*c<<" "<<G4endl;
     G4cout << "make p1 = "<< p12<<" "<<e1*e1<<" "<<mass1*mass1<<" "<<G4endl;
   }
// Incident particle
   G4double pxinc = p*aParticle->Get4Momentum().vect().unit().x();
   G4double pyinc = p*aParticle->Get4Momentum().vect().unit().y();
   G4double pzinc = p*aParticle->Get4Momentum().vect().unit().z();
   if (verboseLevel > 1) {
      G4cout << "NOM SCAT " << px << " " << py << " " << pz << G4endl;
      G4cout << "INCIDENT " << pxinc << " " << pyinc << " " << pzinc << G4endl;
   }
  
// Transform scattered particle to reflect direction of incident particle
   G4double pxnew, pynew, pznew;
   Defs1(p, px, py, pz, pxinc, pyinc, pzinc, &pxnew, &pynew, &pznew);
// Normalize:
   G4double pxre=pxinc-pxnew;
   G4double pyre=pyinc-pynew;
   G4double pzre=pzinc-pznew;
   G4ThreeVector it0(pxnew*GeV, pynew*GeV, pznew*GeV);
   if(p1>0)
   {
     pxnew = pxnew/p1;
     pynew = pynew/p1;
     pznew = pznew/p1;
   }
   else
   {
     //G4double pphi = 2*pi*G4UniformRand();
     //G4double ccth = 2*G4UniformRand()-1;
     pxnew = 0;//std::sin(std::acos(ccth))*std::sin(pphi);
     pynew = 0;//std::sin(std::acos(ccth))*std::cos(phi);
     pznew = 1;//ccth;
   }
   if (verboseLevel > 1) {
      G4cout << "DoIt: returning new momentum vector" << G4endl;
      G4cout << "DoIt: "<<pxinc << " " << pyinc << " " << pzinc <<" "<<p<< G4endl;
      G4cout << "DoIt: "<<pxnew << " " << pynew << " " << pznew <<" "<<p<< G4endl;
   }
 
   if (aSecondary) {
     aSecondary->SetMomentumDirection(pxnew, pynew, pznew);
   } else {
     try
     {
       theParticleChange.SetMomentumChange(pxnew, pynew, pznew);
       theParticleChange.SetEnergyChange(std::sqrt(mass1*mass1+it0.mag2())-mass1);
     }
     catch(G4HadronicException)
     {
       std::cerr << "GHADException originating from components of G4LElastic"<<std::cout;
       throw;
     }
     G4ParticleDefinition * theDef = G4ParticleTable::GetParticleTable()->FindIon(Z,A,0,Z);
     G4ThreeVector it(pxre*GeV, pyre*GeV, pzre*GeV);
     G4DynamicParticle * aSec = 
       new G4DynamicParticle(theDef, it.unit(), it.mag2()/(2.*mass2));
     theParticleChange.AddSecondary(aSec);
     // G4cout << "Final check ###### "<<p<<" "<<it.mag()<<" "<<p1<<G4endl;
   }
   return &theParticleChange;
}

Referenced by G4NeutronHPorLElasticModel::ApplyYourself().

GetFatalEnergyCheckLevels()

const std::pair< G4double, G4double > G4LElastic::GetFatalEnergyCheckLevels ( ) const

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 476 of file G4LElastic.cc.

{
    return std::pair<G4double, G4double>(5*perCent,250*GeV);  // max energy non-conservation is mass of heavy nucleus
}

ModelDescription()

void G4LElastic::ModelDescription ( std::ostream &  outFile ) const

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 55 of file G4LElastic.cc.

{
  outFile << "G4LElastic is one of the Low Energy Parameterized (LEP)\n"
          << "models used to implement elastic hadron scattering from nuclei.\n"
          << "It is a re-engineered version of the GHEISHA code of\n"
          << "H. Fesefeldt.  It performs simplified two-body elastic\n"
          << "scattering for all long-lived hadronic projectiles by using\n"
          << "a two-exponential parameterization in momentum transfer.\n"
          << "It is valid for incident hadrons of all energies.\n";
}

---

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

• G4LElastic.hh
• G4LElastic.cc