G4NeutronInelasticXS Class Reference

#include <G4NeutronInelasticXS.hh>

Inheritance diagram for G4NeutronInelasticXS:

Public Member Functions
	G4NeutronInelasticXS ()
	~G4NeutronInelasticXS () override=default
G4bool	IsElementApplicable (const G4DynamicParticle *, G4int Z, const G4Material *) final
G4bool	IsIsoApplicable (const G4DynamicParticle *, G4int Z, G4int A, const G4Element *, const G4Material *) final
G4double	GetElementCrossSection (const G4DynamicParticle *, G4int Z, const G4Material *) final
G4double	ComputeCrossSectionPerElement (G4double kinEnergy, G4double loge, const G4ParticleDefinition *, const G4Element *, const G4Material *) final
G4double	ComputeIsoCrossSection (G4double kinEnergy, G4double loge, const G4ParticleDefinition *, G4int Z, G4int A, const G4Isotope *iso, const G4Element *elm, const G4Material *mat) final
G4double	GetIsoCrossSection (const G4DynamicParticle *, G4int Z, G4int A, const G4Isotope *iso, const G4Element *elm, const G4Material *mat) final
const G4Isotope *	SelectIsotope (const G4Element *, G4double kinEnergy, G4double logE) final
void	BuildPhysicsTable (const G4ParticleDefinition &) final
void	CrossSectionDescription (std::ostream &) const final
G4double	ElementCrossSection (G4double kinEnergy, G4double loge, G4int Z)
G4double	IsoCrossSection (G4double ekin, G4double logekin, G4int Z, G4int A)
G4NeutronInelasticXS &	operator= (const G4NeutronInelasticXS &right)=delete
	G4NeutronInelasticXS (const G4NeutronInelasticXS &)=delete
Public Member Functions inherited from G4VCrossSectionDataSet
	G4VCrossSectionDataSet (const G4String &nam="")
virtual	~G4VCrossSectionDataSet ()
G4double	GetCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=nullptr)
G4double	ComputeCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=nullptr)
virtual void	DumpPhysicsTable (const G4ParticleDefinition &)
virtual void	SetVerboseLevel (G4int value)
G4double	GetMinKinEnergy () const
void	SetMinKinEnergy (G4double value)
G4double	GetMaxKinEnergy () const
void	SetMaxKinEnergy (G4double value)
bool	ForAllAtomsAndEnergies () const
void	SetForAllAtomsAndEnergies (G4bool val)
const G4String &	GetName () const
void	SetName (const G4String &nam)
G4VCrossSectionDataSet &	operator= (const G4VCrossSectionDataSet &right)=delete
	G4VCrossSectionDataSet (const G4VCrossSectionDataSet &)=delete

Static Public Member Functions
static const char *	Default_Name ()

Additional Inherited Members
Protected Attributes inherited from G4VCrossSectionDataSet
G4int	verboseLevel {0}
G4String	name

Detailed Description

Definition at line 55 of file G4NeutronInelasticXS.hh.

Constructor & Destructor Documentation

G4NeutronInelasticXS() [1/2]

G4NeutronInelasticXS::G4NeutronInelasticXS

(

)

Definition at line 69 of file G4NeutronInelasticXS.cc.

  : G4VCrossSectionDataSet(Default_Name()),
    neutron(G4Neutron::Neutron()),
    elimit(20*CLHEP::MeV),
    lowElimit(1.0e-7*CLHEP::eV)
{
  verboseLevel = 0;
  if (verboseLevel > 0) {
    G4cout << "G4NeutronInelasticXS::G4NeutronInelasticXS Initialise for Z < " 
            << MAXZINEL << G4endl;
  }
  loglowElimit = G4Log(lowElimit);
  if (nullptr == data) { 
    data = new G4ElementData(MAXZINEL);
    data->SetName("nInelastic");
    FindDirectoryPath();
  }
  ggXsection =
    G4CrossSectionDataSetRegistry::Instance()->GetComponentCrossSection("Glauber-Gribov");
  if(ggXsection == nullptr)
    ggXsection = new G4ComponentGGHadronNucleusXsc();
 
  SetForAllAtomsAndEnergies(true);
}

Referenced by G4NeutronInelasticXS(), and operator=().

~G4NeutronInelasticXS()

G4NeutronInelasticXS::~G4NeutronInelasticXS ( )

overridedefault

G4NeutronInelasticXS() [2/2]

G4NeutronInelasticXS::G4NeutronInelasticXS ( const G4NeutronInelasticXS & )

delete

Member Function Documentation

BuildPhysicsTable()

void G4NeutronInelasticXS::BuildPhysicsTable ( const G4ParticleDefinition & p )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 297 of file G4NeutronInelasticXS.cc.

{
  if (verboseLevel > 0) {
    G4cout << "G4NeutronInelasticXS::BuildPhysicsTable for " 
           << p.GetParticleName() << G4endl;
  }
  if (p.GetParticleName() != "neutron") { 
    G4ExceptionDescription ed;
    ed << p.GetParticleName() << " is a wrong particle type -"
       << " only neutron is allowed";
    G4Exception("G4NeutronInelasticXS::BuildPhysicsTable(..)","had012",
                FatalException, ed, "");
    return; 
  }
  // it is possible re-initialisation for the new run
  const G4ElementTable* table = G4Element::GetElementTable();
 
  // initialise static tables only once
  std::call_once(applyOnce, [this]() { isInitializer = true; });
 
  if (isInitializer) {
    G4AutoLock l(&nInelasticXSMutex);
 
    // Upload data for elements used in geometry
    for ( auto const & elm : *table ) {
      G4int Z = std::max( 1, std::min( elm->GetZasInt(), MAXZINEL-1) );
      if ( nullptr == data->GetElementData(Z) ) { Initialise(Z); }
    }
    l.unlock();
  }
  // prepare isotope selection
  std::size_t nIso = temp.size();
  for ( auto const & elm : *table ) {
    std::size_t n = elm->GetNumberOfIsotopes();
    if (n > nIso) { nIso = n; }
  }
  temp.resize(nIso, 0.0);
}

Referenced by G4InterfaceToXS::G4InterfaceToXS().

ComputeCrossSectionPerElement()

G4double G4NeutronInelasticXS::ComputeCrossSectionPerElement ( G4double kinEnergy, G4double loge, const G4ParticleDefinition * , const G4Element * elm, const G4Material *  )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 127 of file G4NeutronInelasticXS.cc.

{
  return ElementCrossSection(ekin, loge, elm->GetZasInt());
}

ComputeIsoCrossSection()

G4double G4NeutronInelasticXS::ComputeIsoCrossSection ( G4double kinEnergy, G4double loge, const G4ParticleDefinition * , G4int Z, G4int A, const G4Isotope * iso, const G4Element * elm, const G4Material * mat )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 174 of file G4NeutronInelasticXS.cc.

{
  return IsoCrossSection(ekin, loge, Z, A); 
}

CrossSectionDescription()

void G4NeutronInelasticXS::CrossSectionDescription ( std::ostream & outFile ) const

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 94 of file G4NeutronInelasticXS.cc.

{
  outFile << "G4NeutronInelasticXS calculates the neutron inelastic 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"
          << "For high energy Glauber-Gribov cross section model is used\n";
}

Default_Name()

static const char * G4NeutronInelasticXS::Default_Name ( )

inlinestatic

Definition at line 63 of file G4NeutronInelasticXS.hh.

{ return "G4NeutronInelasticXS"; }

Referenced by G4INCLXXNeutronBuilder::Build(), G4NeutronCrossSectionXS::ConstructProcess(), and G4NeutronInelasticXS().

ElementCrossSection()

G4double G4NeutronInelasticXS::ElementCrossSection	(	G4double	kinEnergy,
		G4double	loge,
		G4int	Z )

Definition at line 136 of file G4NeutronInelasticXS.cc.

{
  G4int Z = std::min(ZZ, MAXZINEL-1);
  G4double ekin = eKin;
  G4double loge = logE;
  G4double xs;
 
  // very low energy limit
  if (ekin < lowElimit) { 
    ekin = lowElimit; 
    loge = loglowElimit; 
  }
  // pv should exist
  auto pv = GetPhysicsVector(Z);
 
  const G4double e0 = pv->Energy(0);
  if (ekin <= e0) {
    xs = (*pv)[0];
    if (xs > 0.0) { xs *= std::sqrt(e0/ekin); }
  } else if (ekin <= pv->GetMaxEnergy()) {
    xs = pv->LogVectorValue(ekin, loge);
  } else {
    xs = coeff[Z]*ggXsection->GetInelasticElementCrossSection(neutron, ekin,
                                                              Z, aeff[Z]);
  }
 
#ifdef G4VERBOSE
  if(verboseLevel > 1) {
    G4cout  << "G4NeutronInelasticXS::ElementCrossSection Z= " << Z
            << " Ekin(MeV)= " << ekin/CLHEP::MeV 
            << ", ElmXSinel(b)= " << xs/CLHEP::barn 
            << G4endl;
  }
#endif
  return xs;
}

Referenced by ComputeCrossSectionPerElement(), GetElementCrossSection(), and IsoCrossSection().

GetElementCrossSection()

G4double G4NeutronInelasticXS::GetElementCrossSection ( const G4DynamicParticle * aParticle, G4int Z, const G4Material *  )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 119 of file G4NeutronInelasticXS.cc.

{
  return ElementCrossSection(aParticle->GetKineticEnergy(),
                             aParticle->GetLogKineticEnergy(), Z);
}

GetIsoCrossSection()

G4double G4NeutronInelasticXS::GetIsoCrossSection ( const G4DynamicParticle * aParticle, G4int Z, G4int A, const G4Isotope * iso, const G4Element * elm, const G4Material * mat )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 184 of file G4NeutronInelasticXS.cc.

{
  return IsoCrossSection(aParticle->GetKineticEnergy(), 
                         aParticle->GetLogKineticEnergy(), Z, A); 
}

IsElementApplicable()

G4bool G4NeutronInelasticXS::IsElementApplicable ( const G4DynamicParticle * , G4int Z, const G4Material *  )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 104 of file G4NeutronInelasticXS.cc.

{
  return true;
}

IsIsoApplicable()

G4bool G4NeutronInelasticXS::IsIsoApplicable ( const G4DynamicParticle * , G4int Z, G4int A, const G4Element * , const G4Material *  )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 111 of file G4NeutronInelasticXS.cc.

{
  return true;
}

IsoCrossSection()

G4double G4NeutronInelasticXS::IsoCrossSection	(	G4double	ekin,
		G4double	logekin,
		G4int	Z,
		G4int	A )

Definition at line 194 of file G4NeutronInelasticXS.cc.

{
  G4double xs;
  G4int Z = std::min(ZZ, MAXZINEL-1);
  G4double ekin = eKin;
  G4double loge = logE;
 
  /*  
  G4cout << "G4NeutronInelasticXS::IsoCrossSection  Z= " 
         << Z << "  A= " << A << G4endl;
  G4cout << "  Amin= " << amin[Z] << " Amax= " << amax[Z]
         << " E(MeV)= " << ekin << " Ncomp="
         << data->GetNumberOfComponents(Z) << G4endl;
  */
  GetPhysicsVector(Z);
 
  // use isotope cross section if applicable
  if (ekin <= elimit && data->GetNumberOfComponents(Z) > 0) {
    auto pviso = data->GetComponentDataByID(Z, A);
    if (nullptr != pviso) { 
      const G4double e0 = pviso->Energy(0);
      if (ekin > e0) {
        xs = pviso->LogVectorValue(ekin, loge);
      } else {
        xs = (*pviso)[0];
        if (xs > 0.0) { xs *= std::sqrt(e0/ekin); }
      }
#ifdef G4VERBOSE
      if(verboseLevel > 1) {
        G4cout << "G4NeutronInelasticXS::IsoXS: Ekin(MeV)= " 
               << ekin/CLHEP::MeV 
               << "  xs(b)= " << xs/CLHEP::barn 
               << "  Z= " << Z << "  A= " << A << G4endl;
      }
#endif
      return xs;
    }
  }
 
  // use element x-section
  xs = ElementCrossSection(ekin, loge, Z)*A/aeff[Z];
 
#ifdef G4VERBOSE
  if(verboseLevel > 1) {
    G4cout  << "G4NeutronInelasticXS::IsoXS: Z= " << Z << " A= " << A 
            << " Ekin(MeV)= " << ekin/CLHEP::MeV 
            << ", ElmXS(b)= " << xs/CLHEP::barn << G4endl;
  }
#endif
  return xs;
}

Referenced by ComputeIsoCrossSection(), GetIsoCrossSection(), and SelectIsotope().

operator=()

G4NeutronInelasticXS & G4NeutronInelasticXS::operator= ( const G4NeutronInelasticXS & right )

delete

SelectIsotope()

const G4Isotope * G4NeutronInelasticXS::SelectIsotope ( const G4Element * anElement, G4double kinEnergy, G4double logE )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 247 of file G4NeutronInelasticXS.cc.

{
  std::size_t nIso = anElement->GetNumberOfIsotopes();
  const G4Isotope* iso = anElement->GetIsotope(0);
  if(1 == nIso) { return iso; }
 
  // more than 1 isotope
  G4int Z = anElement->GetZasInt();
  if (nullptr == data->GetElementData(Z)) { InitialiseOnFly(Z); }
 
  const G4double* abundVector = anElement->GetRelativeAbundanceVector();
  G4double q = G4UniformRand();
  G4double sum = 0.0;
  std::size_t j;
 
  // isotope wise cross section not available
  if (Z >= MAXZINEL || 0 == data->GetNumberOfComponents(Z)) {
    for (j=0; j<nIso; ++j) {
      sum += abundVector[j];
      if(q <= sum) {
        iso = anElement->GetIsotope((G4int)j);
        break;
      }
    }
    return iso;
  }
 
  // use isotope cross sections
  auto nn = temp.size();
  if(nn < nIso) { temp.resize(nIso, 0.); }
 
  for (j=0; j<nIso; ++j) {
    // G4cout << j << "-th isotope " << anElement->GetIsotope(j)->GetN()
    //       <<  " abund= " << abundVector[j] << G4endl;
    sum += abundVector[j]*IsoCrossSection(kinEnergy, logE, Z, 
                                          anElement->GetIsotope((G4int)j)->GetN());
    temp[j] = sum;
  }
  sum *= q;
  for (j = 0; j<nIso; ++j) {
    if (temp[j] >= sum) {
      iso = anElement->GetIsotope((G4int)j);
      break;
    }
  }
  return iso;
}

---

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

• G4NeutronInelasticXS.hh
• G4NeutronInelasticXS.cc