G4LMsdGenerator Class Reference

#include <G4LMsdGenerator.hh>

Inheritance diagram for G4LMsdGenerator:

Collaboration diagram for G4LMsdGenerator:

Public Member Functions
	G4LMsdGenerator (const G4String &name="LMsdGenerator")
	~G4LMsdGenerator ()
G4bool	IsApplicable (const G4HadProjectile &thePrimary, G4Nucleus &theNucleus)
G4HadFinalState *	ApplyYourself (const G4HadProjectile &thePrimary, G4Nucleus &theNucleus)
G4double	SampleMx (const G4HadProjectile *aParticle)
G4double	SampleT (const G4HadProjectile *aParticle, G4double Mx)
void	ModelDescription (std::ostream &outFile) const
Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")
virtual	~G4HadronicInteraction ()
virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)
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 ()

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 60 of file G4LMsdGenerator.hh.

Constructor & Destructor Documentation

G4LMsdGenerator::G4LMsdGenerator

(

const G4String &

name = "LMsdGenerator"

)

Definition at line 46 of file G4LMsdGenerator.cc.

    : G4HadronicInteraction(name)

{
  fPDGencoding = 0;

  // theParticleChange = new G4HadFinalState;
}

G4LMsdGenerator::~G4LMsdGenerator

(

)

Definition at line 55 of file G4LMsdGenerator.cc.

{
  // delete theParticleChange;
}

Member Function Documentation

G4HadFinalState * G4LMsdGenerator::ApplyYourself ( const G4HadProjectile &  thePrimary, G4Nucleus &  theNucleus  )

virtual

Implements G4HadronicInteraction.

Definition at line 113 of file G4LMsdGenerator.cc.

{
  theParticleChange.Clear();

  const G4HadProjectile* aParticle = &aTrack;
  G4double eTkin = aParticle->GetKineticEnergy();

  if( eTkin <= 1.*CLHEP::GeV && aTrack.GetDefinition() != G4Proton::Proton()) 
  {
    theParticleChange.SetEnergyChange(eTkin);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }

  G4int A = targetNucleus.GetA_asInt();
  G4int Z = targetNucleus.GetZ_asInt();

  G4double plab = aParticle->GetTotalMomentum();
  G4double plab2 = plab*plab;
  
  const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
  G4double partMass = theParticle->GetPDGMass();

  G4double oldE = partMass + eTkin;

  G4double targMass   = G4NucleiProperties::GetNuclearMass(A, Z);
  G4double targMass2   = targMass*targMass;

  G4LorentzVector partLV = aParticle->Get4Momentum();

  G4double sumE = oldE + targMass;
  G4double sumE2 = sumE*sumE;
   
  G4ThreeVector p1     = partLV.vect();
  // G4cout<<"p1 = "<<p1<<G4endl;
  G4ParticleMomentum p1unit = p1.unit();

  G4double Mx = SampleMx(aParticle); // in GeV
  G4double t  = SampleT( aParticle, Mx); // in GeV

  Mx *= CLHEP::GeV;

  G4double Mx2 = Mx*Mx;

  // equation for q|| based on sum-E-P and new invariant mass

  G4double B = sumE2 + targMass2 - Mx2 - plab2;

  G4double a = 4*(plab2 - sumE2);
  G4double b = 4*plab*B;
  G4double c = B*B - 4*sumE2*targMass2;
  G4double det2 = b*b - 4*a*c;
  G4double qLong,  det, eRetard; // , x2, x3, e2;

  if( det2 >= 0.) 
  {
    det = std::sqrt(det2);
    qLong = (-b - det)/2./a;
    eRetard = std::sqrt((plab-qLong)*(plab-qLong)+Mx2);
  }
  else 
  {
    theParticleChange.SetEnergyChange(eTkin);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }
  theParticleChange.SetStatusChange(stopAndKill);

  plab -= qLong;

  G4ThreeVector pRetard = plab*p1unit;

  G4ThreeVector pTarg = p1 - pRetard; 

  G4double eTarg = std::sqrt( targMass2 + pTarg.mag2()); // std::sqrt( targMass*targMass + pTarg.mag2() );

  G4LorentzVector lvRetard(pRetard, eRetard);
  G4LorentzVector lvTarg(pTarg, eTarg);
   
  lvTarg += lvRetard; // sum LV

  G4ThreeVector bst = lvTarg.boostVector();

  lvRetard.boost(-bst); // to CNS

  G4ThreeVector pCMS   = lvRetard.vect();
  G4double momentumCMS = pCMS.mag();
  G4double tMax        = 4.0*momentumCMS*momentumCMS;

  if( t > tMax ) t = tMax*G4UniformRand();

  G4double cost = 1. - 2.0*t/tMax;
  

  G4double phi  = G4UniformRand()*CLHEP::twopi;
  G4double sint;

  if( cost > 1.0 || cost < -1.0 ) // 
  {
    cost = 1.0;
    sint = 0.0;    
  } 
  else  // normal situation
  {
    sint = std::sqrt( (1.0-cost)*(1.0+cost) );
  }    
  G4ThreeVector v1( sint*std::cos(phi), sint*std::sin(phi), cost);

  v1 *= momentumCMS;
  
  G4LorentzVector lvRes( v1.x(),v1.y(),v1.z(), std::sqrt( momentumCMS*momentumCMS + Mx2));

  lvRes.boost(bst); // to LS

  lvTarg -= lvRes;

  G4double eRecoil =  lvTarg.e() - targMass;

  if( eRecoil > 100.*CLHEP::MeV ) // add recoil nucleus
  {
    G4ParticleDefinition * recoilDef = 0;

    if      ( Z == 1 && A == 1 ) { recoilDef = G4Proton::Proton(); }
    else if ( Z == 1 && A == 2 ) { recoilDef = G4Deuteron::Deuteron(); }
    else if ( Z == 1 && A == 3 ) { recoilDef = G4Triton::Triton(); }
    else if ( Z == 2 && A == 3 ) { recoilDef = G4He3::He3(); }
    else if ( Z == 2 && A == 4 ) { recoilDef = G4Alpha::Alpha(); }
    else 
    {
      recoilDef = 
    G4ParticleTable::GetParticleTable()->GetIonTable()->GetIon( Z, A, 0.0 );
    }
    G4DynamicParticle * aSec = new G4DynamicParticle( recoilDef, lvTarg);
    theParticleChange.AddSecondary(aSec);
  } 
  else if( eRecoil > 0.0 ) 
  {
    theParticleChange.SetLocalEnergyDeposit( eRecoil );
  }

  G4ParticleDefinition* ddPart = G4ParticleTable::GetParticleTable()->
                                 FindParticle(fPDGencoding);

  // G4cout<<fPDGencoding<<", "<<ddPart->GetParticleName()<<", "<<ddPart->GetPDGMass()<<" MeV; lvRes = "<<lvRes<<G4endl;

  // G4DynamicParticle * aRes = new G4DynamicParticle( ddPart, lvRes);
  //  theParticleChange.AddSecondary(aRes); // simply return resonance


  
  // Recursive decay using methods of G4KineticTrack

  G4KineticTrack ddkt( ddPart, 0., G4ThreeVector(0.,0.,0.), lvRes);
  G4KineticTrackVector* ddktv = ddkt.Decay();

  G4DecayKineticTracks decay( ddktv );

  for( unsigned int i = 0; i < ddktv->size(); i++ ) // add products to partchange
  {
    G4DynamicParticle * aNew = 
      new G4DynamicParticle( ddktv->operator[](i)->GetDefinition(),
                             ddktv->operator[](i)->Get4Momentum());

    // G4cout<<"       "<<i<<", "<<aNew->GetDefinition()->GetParticleName()<<", "<<aNew->Get4Momentum()<<G4endl;

    theParticleChange.AddSecondary(aNew);
    delete ddktv->operator[](i);
  }
  delete ddktv;
   
  return &theParticleChange;
}

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G4bool G4LMsdGenerator::IsApplicable ( const G4HadProjectile &  thePrimary, G4Nucleus &  theNucleus  )

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 77 of file G4LMsdGenerator.cc.

{
  G4bool applied = false;

  if( ( aTrack.GetDefinition() == G4Proton::Proton() || 
    aTrack.GetDefinition() == G4Neutron::Neutron()  ) && 
        targetNucleus.GetA_asInt() >= 1 &&
      // aTrack.GetKineticEnergy() > 1800*CLHEP::MeV 
        aTrack.GetKineticEnergy() > 300*CLHEP::MeV 
    ) //  750*CLHEP::MeV )   
  {
    applied = true;
  }
  else if( ( aTrack.GetDefinition() == G4PionPlus::PionPlus() || 
         aTrack.GetDefinition() == G4PionMinus::PionMinus()  ) && 
             targetNucleus.GetA_asInt() >= 1 &&
             aTrack.GetKineticEnergy() > 2340*CLHEP::MeV )    
  {
    applied = true;
  }
  else if( ( aTrack.GetDefinition() == G4KaonPlus::KaonPlus() || 
         aTrack.GetDefinition() == G4KaonMinus::KaonMinus()  ) && 
             targetNucleus.GetA_asInt() >= 1 &&
             aTrack.GetKineticEnergy() > 1980*CLHEP::MeV ) 
  {
    applied = true;
  }
  return applied;
}

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void G4LMsdGenerator::ModelDescription ( std::ostream &  outFile ) const

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 60 of file G4LMsdGenerator.cc.

{
  outFile << GetModelName() <<" consists of a " 
      << " string model and a stage to de-excite the excited nuclear fragment."
      << "\n<p>"
      << "The string model simulates the interaction of\n"
          << "an incident hadron with a nucleus, forming \n"
          << "excited strings, decays these strings into hadrons,\n"
          << "and leaves an excited nucleus. \n"
          << "<p>The string model:\n";
}

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G4double G4LMsdGenerator::SampleMx

(

const G4HadProjectile *

aParticle

)

Definition at line 291 of file G4LMsdGenerator.cc.

{
  G4double Mx = 0.;
  G4int i;
  G4double rand = G4UniformRand();

  for( i = 0; i < 60; i++)
  {
    if( rand >= fProbMx[i][1] ) break;
  }
  if(i <= 0)       Mx = fProbMx[0][0];
  else if(i >= 59) Mx = fProbMx[59][0];
  else             Mx = fProbMx[i][0];

  fPDGencoding = 0;

  if ( Mx <=  1.45 )   
  {   
    if( aParticle->GetDefinition() == G4Proton::Proton() )
    {        
      Mx = 1.44;
      // fPDGencoding = 12212;
      fPDGencoding = 2214;
    }
    else if( aParticle->GetDefinition() == G4Neutron::Neutron() ) 
    {
      Mx = 1.44;
      fPDGencoding = 12112;
    }
    else if( aParticle->GetDefinition() == G4PionPlus::PionPlus() ) 
    {
      // Mx = 1.3;
      // fPDGencoding = 100211;
      Mx = 1.26;
      fPDGencoding = 20213; // a1(1260)+
    }
    else if( aParticle->GetDefinition() == G4PionMinus::PionMinus() ) 
    {
      // Mx = 1.3;
      // fPDGencoding = -100211;
      Mx = 1.26;
      fPDGencoding = -20213; // a1(1260)-
    }
    else if( aParticle->GetDefinition() == G4KaonPlus::KaonPlus() ) 
    {
      Mx = 1.27;
      fPDGencoding = 10323;
    }
    else if( aParticle->GetDefinition() == G4KaonMinus::KaonMinus() ) 
    {
      Mx = 1.27;
      fPDGencoding = -10323;
    }
  }
  else if ( Mx <=  1.55 ) 
  {   
    if( aParticle->GetDefinition() == G4Proton::Proton() ) 
    {       
      Mx = 1.52;
      // fPDGencoding = 2124;
      fPDGencoding = 2214;
    }
    else if( aParticle->GetDefinition() == G4Neutron::Neutron() ) 
    {
      Mx = 1.52;
      fPDGencoding = 1214;
    }
    else if( aParticle->GetDefinition() == G4PionPlus::PionPlus() ) 
    {
      // Mx = 1.45;
      // fPDGencoding = 10211;
      Mx = 1.32;
      fPDGencoding = 215; // a2(1320)+
    }
    else if( aParticle->GetDefinition() == G4PionMinus::PionMinus() ) 
    {
      // Mx = 1.45;
      // fPDGencoding = -10211;
      Mx = 1.32;
      fPDGencoding = -215; // a2(1320)-
    }
    else if( aParticle->GetDefinition() == G4KaonPlus::KaonPlus() ) 
    {
      Mx = 1.46;
      fPDGencoding = 100321;
    }
    else if( aParticle->GetDefinition() == G4KaonMinus::KaonMinus() ) 
    {
      Mx = 1.46;
      fPDGencoding = -100321;
    }
  }
  else                    
  {    
    if( aParticle->GetDefinition() == G4Proton::Proton() ) 
    {       
      Mx = 1.68;
      // fPDGencoding = 12216;
      fPDGencoding = 2214;
    }
    else if( aParticle->GetDefinition() == G4Neutron::Neutron() ) 
    {
      Mx = 1.68;
      fPDGencoding = 12116;
    }
    else if( aParticle->GetDefinition() == G4PionPlus::PionPlus() ) 
    {
      Mx = 1.67;
      fPDGencoding = 10215;  // pi2(1670)+
      // Mx = 1.45;
      // fPDGencoding = 10211;
    }
    else if( aParticle->GetDefinition() == G4PionMinus::PionMinus() ) 
    {
      Mx = 1.67;     // f0 problems->4pi vmg 20.11.14
      fPDGencoding = -10215;  // pi2(1670)-
      // Mx = 1.45;
      // fPDGencoding = -10211;
    }
    else if( aParticle->GetDefinition() == G4KaonPlus::KaonPlus() ) 
    {
      Mx = 1.68;
      fPDGencoding = 30323;
    }
    else if( aParticle->GetDefinition() == G4KaonMinus::KaonMinus() ) 
    {
      Mx = 1.68;
      fPDGencoding = -30323;
    }
  } 
  if(fPDGencoding == 0)
  {
      Mx = 1.44;
      // fPDGencoding = 12212;   
      fPDGencoding = 2214;
  } 
  G4ParticleDefinition* myResonance = 
  G4ParticleTable::GetParticleTable()->FindParticle( fPDGencoding );
  
  if ( myResonance ) Mx = myResonance->GetPDGMass();

  // G4cout<<"PDG-ID = "<<fPDGencoding<<"; with mass = "<<Mx/CLHEP::GeV<<" GeV"<<G4endl;

  return Mx/CLHEP::GeV;
}

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G4double G4LMsdGenerator::SampleT	(	const G4HadProjectile *	aParticle,
		G4double	Mx
	)

Definition at line 441 of file G4LMsdGenerator.cc.

{
  G4double t=0., b=0., rTkin = 50.*CLHEP::GeV, eTkin = aParticle->GetKineticEnergy();
  G4int i;

  for( i = 0; i < 23; ++i)
  {
    if( Mx <= fMxBdata[i][0] ) break;
  }
  if( i <= 0 )       b = fMxBdata[0][1];
  else if( i >= 22 ) b = fMxBdata[22][1];
  else               b = fMxBdata[i][1];

  if( eTkin > rTkin ) b *= 1. + G4Log(eTkin/rTkin);

  G4double rand = G4UniformRand();

  t = -G4Log(rand)/b;

  t *= (CLHEP::GeV*CLHEP::GeV); // in G4 internal units

  return t;
}

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---

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

• source/geant4.10.03.p03/source/processes/hadronic/models/coherent_elastic/include/G4LMsdGenerator.hh
• source/geant4.10.03.p03/source/processes/hadronic/models/coherent_elastic/src/G4LMsdGenerator.cc