G4NeutronCaptureXS Class Reference

#include <G4NeutronCaptureXS.hh>

Inheritance diagram for G4NeutronCaptureXS:

Public Member Functions
	G4NeutronCaptureXS ()
	~G4NeutronCaptureXS () final
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	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	IsoCrossSection (G4double ekin, G4double logekin, G4int Z, G4int A)
G4NeutronCaptureXS &	operator= (const G4NeutronCaptureXS &right)=delete
	G4NeutronCaptureXS (const G4NeutronCaptureXS &)=delete
Public Member Functions inherited from G4VCrossSectionDataSet
	G4VCrossSectionDataSet (const G4String &nam="")
virtual	~G4VCrossSectionDataSet ()
virtual G4bool	IsElementApplicable (const G4DynamicParticle *, G4int Z, const G4Material *mat=nullptr)
virtual G4bool	IsIsoApplicable (const G4DynamicParticle *, G4int Z, G4int A, const G4Element *elm=nullptr, const G4Material *mat=nullptr)
G4double	GetCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=nullptr)
G4double	ComputeCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=nullptr)
virtual G4double	GetElementCrossSection (const G4DynamicParticle *, G4int Z, const G4Material *mat=nullptr)
virtual G4double	GetIsoCrossSection (const G4DynamicParticle *, G4int Z, G4int A, const G4Isotope *iso=nullptr, const G4Element *elm=nullptr, const G4Material *mat=nullptr)
virtual const G4Isotope *	SelectIsotope (const G4Element *, G4double kinEnergy, G4double logE)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	DumpPhysicsTable (const G4ParticleDefinition &)
virtual void	CrossSectionDescription (std::ostream &) const
virtual G4int	GetVerboseLevel () const
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

Static Public Member Functions
static const char *	Default_Name ()

Additional Inherited Members
Protected Member Functions inherited from G4VCrossSectionDataSet
void	SetName (const G4String &)
Protected Attributes inherited from G4VCrossSectionDataSet
G4int	verboseLevel

Detailed Description

Definition at line 60 of file G4NeutronCaptureXS.hh.

Constructor & Destructor Documentation

G4NeutronCaptureXS() [1/2]

G4NeutronCaptureXS::G4NeutronCaptureXS ( )

explicit

Definition at line 64 of file G4NeutronCaptureXS.cc.

 : G4VCrossSectionDataSet(Default_Name()),
   emax(20*CLHEP::MeV),elimit(1.0e-10*CLHEP::eV)
{
  //  verboseLevel = 0;
  if(verboseLevel > 0){
    G4cout  << "G4NeutronCaptureXS::G4NeutronCaptureXS: Initialise for Z < "
        << MAXZCAPTURE << G4endl;
  }
  logElimit   = G4Log(elimit);
  isMaster    = false;
  temp.resize(13,0.0);
}

~G4NeutronCaptureXS()

G4NeutronCaptureXS::~G4NeutronCaptureXS ( )

final

Definition at line 78 of file G4NeutronCaptureXS.cc.

{
  if(isMaster) { delete data; data = nullptr; }
}

G4NeutronCaptureXS() [2/2]

G4NeutronCaptureXS::G4NeutronCaptureXS ( const G4NeutronCaptureXS &  )

delete

Member Function Documentation

BuildPhysicsTable()

void G4NeutronCaptureXS::BuildPhysicsTable ( const G4ParticleDefinition &  p )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 241 of file G4NeutronCaptureXS.cc.

{
  if(verboseLevel > 0){
    G4cout << "G4NeutronCaptureXS::BuildPhysicsTable for " 
       << p.GetParticleName() << G4endl;
  }
  if(p.GetParticleName() != "neutron") { 
    G4ExceptionDescription ed;
    ed << p.GetParticleName() << " is a wrong particle type -"
       << " only neutron is allowed";
    G4Exception("G4NeutronCaptureXS::BuildPhysicsTable(..)","had012",
        FatalException, ed, "");
    return; 
  }
 
  if(nullptr == data) { 
#ifdef G4MULTITHREADED
    G4MUTEXLOCK(&neutronCaptureXSMutex);
    if(nullptr == data) { 
#endif
      isMaster = true;
      data = new G4ElementData(); 
      data->SetName("NeutronCapture");
      FindDirectoryPath();
#ifdef G4MULTITHREADED
    }
    G4MUTEXUNLOCK(&neutronCaptureXSMutex);
#endif
  }
 
  // it is possible re-initialisation for the second run
  if(isMaster) {
 
    // Access to elements
    auto theCoupleTable = G4ProductionCutsTable::GetProductionCutsTable();
    size_t numOfCouples = theCoupleTable->GetTableSize();
    for(size_t j=0; j<numOfCouples; ++j) {
      auto mat = theCoupleTable->GetMaterialCutsCouple(j)->GetMaterial();
      auto elmVec = mat->GetElementVector();
      size_t numOfElem = mat->GetNumberOfElements();
      for (size_t ie = 0; ie < numOfElem; ++ie) {
    G4int Z = std::max(1,std::min(((*elmVec)[ie])->GetZasInt(), MAXZCAPTURE-1));
    if(nullptr == data->GetElementData(Z)) { Initialise(Z); }
      }
    }
  }
}

CrossSectionDescription()

void G4NeutronCaptureXS::CrossSectionDescription ( std::ostream &  outFile ) const

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 83 of file G4NeutronCaptureXS.cc.

{
  outFile << "G4NeutronCaptureXS calculates the neutron capture cross sections\n"
          << "on nuclei using data from the high precision neutron database.\n"
          << "These data are simplified and smoothed over the resonance region\n"
          << "in order to reduce CPU time.  G4NeutronCaptureXS is set to zero\n"
          << "above 20 MeV for all targets. Cross section is zero also for Z>92.\n";
}

Default_Name()

static const char * G4NeutronCaptureXS::Default_Name ( )

inlinestatic

Definition at line 68 of file G4NeutronCaptureXS.hh.

{return "G4NeutronCaptureXS";}

Referenced by LBE::ConstructHad(), and G4NeutronCrossSectionXS::ConstructProcess().

GetElementCrossSection()

G4double G4NeutronCaptureXS::GetElementCrossSection ( const G4DynamicParticle *  aParticle, G4int  Z, const G4Material *    )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 108 of file G4NeutronCaptureXS.cc.

{
  G4double xs = 0.0;
  G4double ekin = aParticle->GetKineticEnergy();
  if(ekin > emax) { return xs; }
 
  G4int Z = std::min(ZZ, MAXZCAPTURE-1);
  G4double logEkin = aParticle->GetLogKineticEnergy();
  if(ekin < elimit) { ekin = elimit; logEkin = logElimit; }
 
  auto pv = GetPhysicsVector(Z);
  if(pv == nullptr) { return xs; }
 
  const G4double e1 = pv->Energy(1);
  xs = (ekin >= e1) ? pv->LogVectorValue(ekin, logEkin) 
    : (*pv)[1]*std::sqrt(e1/ekin); 
 
#ifdef G4VERBOSE
  if(verboseLevel > 1){
    G4cout  << "Ekin= " << ekin/CLHEP::MeV 
            << " ElmXScap(b)= " << xs/CLHEP::barn << G4endl;
  }
#endif
  return xs;
}

GetIsoCrossSection()

G4double G4NeutronCaptureXS::GetIsoCrossSection ( const G4DynamicParticle *  aParticle, G4int  Z, G4int  A, const G4Isotope *  iso, const G4Element *  elm, const G4Material *  mat  )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 136 of file G4NeutronCaptureXS.cc.

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

IsElementApplicable()

G4bool G4NeutronCaptureXS::IsElementApplicable ( const G4DynamicParticle *  , G4int  Z, const G4Material *    )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 93 of file G4NeutronCaptureXS.cc.

{
  return true;
}

IsIsoApplicable()

G4bool G4NeutronCaptureXS::IsIsoApplicable ( const G4DynamicParticle *  , G4int  Z, G4int  A, const G4Element *  , const G4Material *    )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 100 of file G4NeutronCaptureXS.cc.

{
  return true;
}

IsoCrossSection()

G4double G4NeutronCaptureXS::IsoCrossSection	(	G4double	ekin,
		G4double	logekin,
		G4int	Z,
		G4int	A
	)

Definition at line 146 of file G4NeutronCaptureXS.cc.

{
  G4double xs = 0.0;
  if(eKin > emax) { return xs; }
 
  G4int Z = std::min(ZZ, MAXZCAPTURE-1);
  G4double ekin = eKin;
  G4double logEkin = logE;
  if(ekin < elimit) { 
    ekin = elimit; 
    logEkin = logElimit; 
  }
 
  auto pv = GetPhysicsVector(Z);
  if(pv == nullptr) { return xs; }
 
  if(amin[Z] > 0 && A >= amin[Z] && A <= amax[Z]) {
    G4PhysicsVector* pviso = data->GetComponentDataByID(Z, A - amin[Z]);
    if(pviso != nullptr) { 
      const G4double e1 = pviso->Energy(1);
      xs = (ekin >= e1) ? pviso->LogVectorValue(ekin, logEkin)
    : (*pviso)[1]*std::sqrt(e1/ekin); 
#ifdef G4VERBOSE
      if(verboseLevel > 0) {
    G4cout << "G4NeutronCaptureXS::IsoXS: Ekin(MeV)= " << ekin/MeV 
           << "  xs(b)= " << xs/barn 
           << "  Z= " << Z << "  A= " << A << G4endl;
      }
#endif
      return xs;
    }
  }
  // isotope data are not available or applicable
  const G4double e1 = pv->Energy(1);
  xs = (ekin >= e1) ? pv->LogVectorValue(ekin, logEkin)
    : (*pv)[1]*std::sqrt(e1/ekin); 
#ifdef G4VERBOSE
  if(verboseLevel > 0) {
    G4cout << "G4NeutronCaptureXS::IsoXS: Ekin(MeV)= " << ekin/MeV 
           << "  xs(b)= " << xs/barn 
       << "  Z= " << Z << "  A= " << A << " no iso XS" << G4endl;
  }
#endif
  return xs;
}

Referenced by GetIsoCrossSection(), and SelectIsotope().

operator=()

G4NeutronCaptureXS & G4NeutronCaptureXS::operator= ( const G4NeutronCaptureXS &  right )

delete

SelectIsotope()

const G4Isotope * G4NeutronCaptureXS::SelectIsotope ( const G4Element *  anElement, G4double  kinEnergy, G4double  logE  )

finalvirtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 194 of file G4NeutronCaptureXS.cc.

{
  size_t nIso = anElement->GetNumberOfIsotopes();
  const G4Isotope* iso = anElement->GetIsotope(0);
 
  //G4cout << "SelectIsotope NIso= " << nIso << G4endl;
  if(1 == nIso) { return iso; }
 
  // more than 1 isotope
  G4int Z = anElement->GetZasInt();
 
  const G4double* abundVector = anElement->GetRelativeAbundanceVector();
  G4double q = G4UniformRand();
  G4double sum = 0.0;
 
  // is there isotope wise cross section?
  size_t j;
  if(0 == amin[Z] || Z >= MAXZCAPTURE) {
    for (j = 0; j<nIso; ++j) {
      sum += abundVector[j];
      if(q <= sum) {
    iso = anElement->GetIsotope(j);
    break;
      }
    }
    return iso;
  } 
  size_t nn = temp.size();
  if(nn < nIso) { temp.resize(nIso, 0.); }
 
  for (j=0; j<nIso; ++j) {
    sum += abundVector[j]*IsoCrossSection(kinEnergy, logE, Z, 
                      anElement->GetIsotope(j)->GetN());
    temp[j] = sum;
  }
  sum *= q;
  for (j = 0; j<nIso; ++j) {
    if(temp[j] >= sum) {
      iso = anElement->GetIsotope(j);
      break;
    }
  }
  return iso;
}

---

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

• G4NeutronCaptureXS.hh
• G4NeutronCaptureXS.cc