G4NeutronElasticXS Class Reference

#include <G4NeutronElasticXS.hh>

Inheritance diagram for G4NeutronElasticXS:

Public Member Functions
	G4NeutronElasticXS ()
virtual	~G4NeutronElasticXS ()
virtual G4bool	IsElementApplicable (const G4DynamicParticle *, G4int Z, const G4Material *)
virtual G4double	GetElementCrossSection (const G4DynamicParticle *, G4int Z, const G4Material *mat=0)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	CrossSectionDescription (std::ostream &) const

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Detailed Description

Definition at line 59 of file G4NeutronElasticXS.hh.

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Constructor & Destructor Documentation

G4NeutronElasticXS::G4NeutronElasticXS

(

)

Definition at line 59 of file G4NeutronElasticXS.cc.

References G4cout, G4endl, and G4VCrossSectionDataSet::verboseLevel.

 : G4VCrossSectionDataSet("G4NeutronElasticXS"),
   proton(G4Proton::Proton()), maxZ(92)
{
  //  verboseLevel = 0;
  if(verboseLevel > 0){
    G4cout  << "G4NeutronElasticXS::G4NeutronElasticXS Initialise for Z < " 
            << maxZ + 1 << G4endl;
  }
  data.resize(maxZ+1, 0);
  coeff.resize(maxZ+1, 1.0);
  ggXsection = new G4GlauberGribovCrossSection();
  fNucleon = new G4HadronNucleonXsc();
  isInitialized = false;
}

G4NeutronElasticXS::~G4NeutronElasticXS

(

)

[virtual]

Definition at line 75 of file G4NeutronElasticXS.cc.

{
  delete fNucleon;
  for(G4int i=0; i<=maxZ; ++i) {
    delete data[i];
  }
}

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Member Function Documentation

void G4NeutronElasticXS::BuildPhysicsTable

(

const G4ParticleDefinition &

)

[virtual]

Reimplemented from G4VCrossSectionDataSet.

Definition at line 143 of file G4NeutronElasticXS.cc.

References G4cout, G4endl, G4Element::GetElementTable(), G4Element::GetNumberOfElements(), G4ParticleDefinition::GetParticleName(), G4Neutron::Neutron(), and G4VCrossSectionDataSet::verboseLevel.

{
  if(isInitialized) { return; }
  if(verboseLevel > 0){
    G4cout << "G4NeutronElasticXS::BuildPhysicsTable for " 
           << p.GetParticleName() << G4endl;
  }
  if(p.GetParticleName() != "neutron") { 
    throw G4HadronicException(__FILE__, __LINE__,"Wrong particle type");
    return; 
  }
  isInitialized = true;

  // check environment variable 
  // Build the complete string identifying the file with the data set
  char* path = getenv("G4NEUTRONXSDATA");
  if (!path){
    throw G4HadronicException(__FILE__, __LINE__, 
                              "G4NEUTRONXSDATA environment variable not defined");
    return;
  }

  G4DynamicParticle* dynParticle = 
    new G4DynamicParticle(G4Neutron::Neutron(),G4ThreeVector(1,0,0),1);

  // Access to elements
  const G4ElementTable* theElmTable = G4Element::GetElementTable();
  size_t numOfElm = G4Element::GetNumberOfElements();
  if(numOfElm > 0) {
    for(size_t i=0; i<numOfElm; ++i) {
      G4int Z = G4int(((*theElmTable)[i])->GetZ());
      if(Z < 1)         { Z = 1; }
      else if(Z > maxZ) { Z = maxZ; }
      //G4cout << "Z= " << Z << G4endl;
      // Initialisation 
      if(!data[Z]) { Initialise(Z, dynParticle, path); }
    }
  }
  delete dynParticle;
}

void G4NeutronElasticXS::CrossSectionDescription

(

std::ostream &

)

const [virtual]

Reimplemented from G4VCrossSectionDataSet.

Definition at line 83 of file G4NeutronElasticXS.cc.

{
  outFile << "G4NeutronElasticXS calculates the neutron elastic scattering\n"
          << "cross section on nuclei using data from the high precision\n"
          << "neutron database.  These data are simplified and smoothed over\n"
          << "the resonance region in order to reduce CPU time.\n"
          << "G4NeutronElasticXS is valid for energies up to 20 MeV, for all\n"
          << "targets through U.\n";  
}

G4double G4NeutronElasticXS::GetElementCrossSection	(	const G4DynamicParticle *	,
		G4int	Z,
		const G4Material *	mat = 0
	)			[virtual]

Reimplemented from G4VCrossSectionDataSet.

Definition at line 101 of file G4NeutronElasticXS.cc.

References G4PhysicsVector::Energy(), G4cout, G4endl, G4GlauberGribovCrossSection::GetElasticGlauberGribovXsc(), G4HadronNucleonXsc::GetElasticHadronNucleonXsc(), G4HadronNucleonXsc::GetHadronNucleonXscPDG(), G4GlauberGribovCrossSection::GetIsoCrossSection(), G4DynamicParticle::GetKineticEnergy(), G4PhysicsVector::GetVectorLength(), G4NistManager::Instance(), CLHEP::detail::n, G4PhysicsVector::Value(), and G4VCrossSectionDataSet::verboseLevel.

{
  G4double xs = 0.0;
  G4double ekin = aParticle->GetKineticEnergy();

  if(Z < 1 || Z > maxZ) { return xs; }

  G4int Amean = G4int(G4NistManager::Instance()->GetAtomicMassAmu(Z)+0.5);
  G4PhysicsVector* pv = data[Z];
  //  G4cout  << "G4NeutronElasticXS::GetCrossSection e= " << ekin << " Z= " << Z << G4endl;

  // element was not initialised
  if(!pv) {
    Initialise(Z);
    pv = data[Z];
    if(!pv) { return xs; }
  }

  G4double e1 = pv->Energy(0);
  if(ekin <= e1) { return (*pv)[0]; }

  G4int n = pv->GetVectorLength() - 1;
  G4double e2 = pv->Energy(n);

  if(ekin <= e2) { 
    xs = pv->Value(ekin); 
  } else if(1 == Z) { 
    fNucleon->GetHadronNucleonXscPDG(aParticle, proton);
    xs = coeff[1]*fNucleon->GetElasticHadronNucleonXsc();
  } else {          
    ggXsection->GetIsoCrossSection(aParticle, Z, Amean);
    xs = coeff[Z]*ggXsection->GetElasticGlauberGribovXsc();
  }

  if(verboseLevel > 0){
    G4cout  << "ekin= " << ekin << ",  XSinel= " << xs << G4endl;
  }
  return xs;
}

G4bool G4NeutronElasticXS::IsElementApplicable	(	const G4DynamicParticle *	,
		G4int	Z,
		const G4Material *
	)			[virtual]

Reimplemented from G4VCrossSectionDataSet.

Definition at line 94 of file G4NeutronElasticXS.cc.

{
  return true;
}

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

• G4NeutronElasticXS.hh
• G4NeutronElasticXS.cc

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