G4ParticleHPThermalScattering Class Reference

#include <G4ParticleHPThermalScattering.hh>

Inheritance diagram for G4ParticleHPThermalScattering:

Public Member Functions
	G4ParticleHPThermalScattering ()
	~G4ParticleHPThermalScattering () override
G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &aTargetNucleus) override
const std::pair< G4double, G4double >	GetFatalEnergyCheckLevels () const override
void	AddUserThermalScatteringFile (const G4String &, const G4String &)
void	BuildPhysicsTable (const G4ParticleDefinition &) override
void	ModelDescription (std::ostream &outFile) const override
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)
virtual G4bool	IsApplicable (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
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 std::pair< G4double, G4double >	GetEnergyMomentumCheckLevels () const
void	SetEnergyMomentumCheckLevels (G4double relativeLevel, G4double absoluteLevel)
virtual void	InitialiseModel ()
	G4HadronicInteraction (const G4HadronicInteraction &right)=delete
const G4HadronicInteraction &	operator= (const G4HadronicInteraction &right)=delete
G4bool	operator== (const G4HadronicInteraction &right) const =delete
G4bool	operator!= (const G4HadronicInteraction &right) const =delete

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 83 of file G4ParticleHPThermalScattering.hh.

Constructor & Destructor Documentation

G4ParticleHPThermalScattering()

G4ParticleHPThermalScattering::G4ParticleHPThermalScattering

(

)

Definition at line 56 of file G4ParticleHPThermalScattering.cc.

  : G4HadronicInteraction("NeutronHPThermalScattering")
{
  theHPElastic = new G4ParticleHPElastic();
 
  SetMinEnergy(0. * eV);
  SetMaxEnergy(4 * eV);
  theXSection = new G4ParticleHPThermalScatteringData();
 
  nMaterial = 0;
  nElement = 0;
}

~G4ParticleHPThermalScattering()

G4ParticleHPThermalScattering::~G4ParticleHPThermalScattering ( )

override

Definition at line 69 of file G4ParticleHPThermalScattering.cc.

{
  delete theHPElastic;
}

Member Function Documentation

AddUserThermalScatteringFile()

void G4ParticleHPThermalScattering::AddUserThermalScatteringFile	(	const G4String &	nameG4Element,
		const G4String &	filename )

Definition at line 1188 of file G4ParticleHPThermalScattering.cc.

{
  names.AddThermalElement(nameG4Element, filename);
  theXSection->AddUserThermalScatteringFile(nameG4Element, filename);
  buildPhysicsTable();
}

ApplyYourself()

G4HadFinalState * G4ParticleHPThermalScattering::ApplyYourself ( const G4HadProjectile & aTrack, G4Nucleus & aTargetNucleus )

overridevirtual

Reimplemented from G4HadronicInteraction.

Definition at line 305 of file G4ParticleHPThermalScattering.cc.

{
  // Select Element > Reaction >
 
  const G4Material* theMaterial = aTrack.GetMaterial();
  G4double aTemp = theMaterial->GetTemperature();
  auto n = (G4int)theMaterial->GetNumberOfElements();
 
  G4bool findThermalElement = false;
  G4int ielement;
  const G4Element* theElement = nullptr;
  for (G4int i = 0; i < n; ++i) {
    theElement = theMaterial->GetElement(i);
    // Select target element
    if (aNucleus.GetZ_asInt() == (G4int)(theElement->GetZ() + 0.5)) {
      // Check Applicability of Thermal Scattering
      if (getTS_ID(nullptr, theElement) != -1) {
        ielement = getTS_ID(nullptr, theElement);
        findThermalElement = true;
        break;
      }
      if (getTS_ID(theMaterial, theElement) != -1) {
        ielement = getTS_ID(theMaterial, theElement);
        findThermalElement = true;
        break;
      }
    }
  }
 
  if (findThermalElement) {
    // Select Reaction  (Inelastic, coherent, incoherent)
    const G4ParticleDefinition* pd = aTrack.GetDefinition();
    auto dp = new G4DynamicParticle(pd, aTrack.Get4Momentum());
    G4double total = theXSection->GetCrossSection(dp, theElement, theMaterial);
    G4double inelastic = theXSection->GetInelasticCrossSection(dp, theElement, theMaterial);
 
    auto inelELM = inelasticFSs->find(ielement);
    G4bool mayBeInel = (inelELM != inelasticFSs->end());
    auto coheELM = coherentFSs->find(ielement);
    G4bool mayBeCohe = (coheELM != coherentFSs->end());
    auto incoELM = incoherentFSs->find(ielement);
    G4bool mayBeInco = (incoELM != incoherentFSs->end());
   
    G4double random = G4UniformRand();
    if ((total*random <= inelastic && mayBeInel) || (!mayBeCohe && !mayBeInco)) {
      // Inelastic
 
      std::vector<G4double> v_temp;
      v_temp.clear();
      for (auto it = inelELM->second->begin(); it != inelELM->second->end(); ++it)
      {
        v_temp.push_back(it->first);
      }
 
      std::pair<G4double, G4double> tempLH = find_LH(aTemp, &v_temp);
      //
      // For T_L aNEP_EPM_TL  and T_H aNEP_EPM_TH
      //
      std::vector<E_P_E_isoAng*>* vNEP_EPM_TL = nullptr;
      std::vector<E_P_E_isoAng*>* vNEP_EPM_TH = nullptr;
 
      if (tempLH.first != 0.0 && tempLH.second != 0.0) {
        vNEP_EPM_TL = inelELM->second->find(tempLH.first / kelvin)->second;
        vNEP_EPM_TH = inelELM->second->find(tempLH.second / kelvin)->second;
      }
      else if (tempLH.first == 0.0) {
        auto itm = inelELM->second->begin();
        vNEP_EPM_TL = itm->second;
        ++itm;
        vNEP_EPM_TH = itm->second;
        tempLH.first = tempLH.second;
        tempLH.second = itm->first;
      }
      else if (tempLH.second == 0.0) {
        auto itm = inelELM->second->end();
        --itm;
        vNEP_EPM_TH = itm->second;
        --itm;
        vNEP_EPM_TL = itm->second;
        tempLH.second = tempLH.first;
        tempLH.first = itm->first;
      }
 
      G4double sE = 0., mu = 1.0;
 
      // New Geant4 method - Stochastic temperature interpolation of the final state
      // (continuous temperature interpolation was used previously)
      std::pair<G4double, G4double> secondaryParam;
      G4double rand_temp = G4UniformRand();
      if (rand_temp < (aTemp - tempLH.first) / (tempLH.second - tempLH.first))
        secondaryParam = sample_inelastic_E_mu(aTrack.GetKineticEnergy(), vNEP_EPM_TH);
      else
        secondaryParam = sample_inelastic_E_mu(aTrack.GetKineticEnergy(), vNEP_EPM_TL);
 
      sE = secondaryParam.first;
      mu = secondaryParam.second;
 
      // set
      theParticleChange.SetEnergyChange(sE);
      G4double phi = CLHEP::twopi * G4UniformRand();
      G4double sint = std::sqrt(1 - mu * mu);
      theParticleChange.SetMomentumChange(sint * std::cos(phi), sint * std::sin(phi), mu);
    }
    else if (mayBeCohe &&
         (!mayBeInco || random*total
          <= (inelastic + theXSection->GetCoherentCrossSection(dp, theElement, theMaterial))))
    {
      // Coherent Elastic
 
      G4double E = aTrack.GetKineticEnergy();
 
      // T_L and T_H
      std::vector<G4double> v_temp;
      v_temp.clear();
      for (auto it = coheELM->second->begin(); it != coheELM->second->end(); ++it)
      {
        v_temp.push_back(it->first);
      }
 
      //          T_L        T_H
      std::pair<G4double, G4double> tempLH = find_LH(aTemp, &v_temp);
      //
      //
      // For T_L anEPM_TL  and T_H anEPM_TH
      //
      std::vector<std::pair<G4double, G4double>*>* pvE_p_TL = nullptr;
      std::vector<std::pair<G4double, G4double>*>* pvE_p_TH = nullptr;
 
      if (tempLH.first != 0.0 && tempLH.second != 0.0) {
        pvE_p_TL = coheELM->second->find(tempLH.first / kelvin)->second;
        pvE_p_TH = coheELM->second->find(tempLH.first / kelvin)->second;
      }
      else if (tempLH.first == 0.0) {
        pvE_p_TL = coheELM->second->find(v_temp[0])->second;
        pvE_p_TH = coheELM->second->find(v_temp[1])->second;
        tempLH.first = tempLH.second;
        tempLH.second = v_temp[1];
      }
      else if (tempLH.second == 0.0) {
        pvE_p_TH = coheELM->second->find(v_temp.back())->second;
        auto itv = v_temp.cend();
        --itv;
        --itv;
        pvE_p_TL = coheELM->second->find(*itv)->second;
        tempLH.second = tempLH.first;
        tempLH.first = *itv;
      }
      else {
        // tempLH.first == 0.0 && tempLH.second
        throw G4HadronicException(
          __FILE__, __LINE__,
          "A problem is found in Thermal Scattering Data! Unexpected temperature values in data");
      }
 
      std::vector<G4double> vE_T;
      std::vector<G4double> vp_T;
 
      auto n1 = (G4int)pvE_p_TL->size();
 
      // New Geant4 method - Stochastic interpolation of the final state
      std::vector<std::pair<G4double, G4double>*>* pvE_p_T_sampled;
      G4double rand_temp = G4UniformRand();
      if (rand_temp < (aTemp - tempLH.first) / (tempLH.second - tempLH.first))
        pvE_p_T_sampled = pvE_p_TH;
      else
        pvE_p_T_sampled = pvE_p_TL;
 
      // 171005 fix bug, contribution from H.N. TRAN@CEA
      for (G4int i = 0; i < n1; ++i) {
        vE_T.push_back((*pvE_p_T_sampled)[i]->first);
        vp_T.push_back((*pvE_p_T_sampled)[i]->second);
      }
 
      G4int j = 0;
      for (G4int i = 1; i < n1; ++i) {
        if (E / eV < vE_T[i]) {
          j = i - 1;
          break;
        }
      }
 
      G4double rand_for_mu = G4UniformRand();
 
      G4int k = 0;
      for (G4int i = 0; i <= j; ++i) {
        G4double Pi = vp_T[i] / vp_T[j];
        if (rand_for_mu < Pi) {
          k = i;
          break;
        }
      }
 
      G4double Ei = vE_T[k];
 
      G4double mu = 1 - 2 * Ei / (E / eV);
 
      if (mu < -1.0) mu = -1.0;
 
      theParticleChange.SetEnergyChange(E);
      G4double phi = CLHEP::twopi * G4UniformRand();
      G4double sint = std::sqrt(1 - mu * mu);
      theParticleChange.SetMomentumChange(sint * std::cos(phi), sint * std::sin(phi), mu);
    }
    else if (mayBeInco) {
      // InCoherent Elastic
 
      // T_L and T_H
      std::vector<G4double> v_temp;
      v_temp.clear();
      for (auto it = incoELM->second->cbegin(); it != incoELM->second->cend(); ++it)
      {
        v_temp.push_back(it->first);
      }
 
      //          T_L        T_H
      std::pair<G4double, G4double> tempLH = find_LH(aTemp, &v_temp);
 
      //
      // For T_L anEPM_TL  and T_H anEPM_TH
      //
 
      E_isoAng anEPM_TL_E;
      E_isoAng anEPM_TH_E;
 
      if (tempLH.first != 0.0 && tempLH.second != 0.0) {
        // Interpolate TL and TH
        anEPM_TL_E = create_E_isoAng_from_energy(
          aTrack.GetKineticEnergy(),
          incoELM->second->find(tempLH.first / kelvin)->second);
        anEPM_TH_E = create_E_isoAng_from_energy(
          aTrack.GetKineticEnergy(),
          incoELM->second->find(tempLH.second / kelvin)->second);
      }
      else if (tempLH.first == 0.0) {
        // Extrapolate T0 and T1
        anEPM_TL_E = create_E_isoAng_from_energy(
          aTrack.GetKineticEnergy(),
          incoELM->second->find(v_temp[0])->second);
        anEPM_TH_E = create_E_isoAng_from_energy(
          aTrack.GetKineticEnergy(),
          incoELM->second->find(v_temp[1])->second);
        tempLH.first = tempLH.second;
        tempLH.second = v_temp[1];
      }
      else if (tempLH.second == 0.0) {
        // Extrapolate Tmax-1 and Tmax
    std::size_t nn = v_temp.size();
    if (nn < 2) { return &theParticleChange; }
        anEPM_TL_E = create_E_isoAng_from_energy(
          aTrack.GetKineticEnergy(),
          incoELM->second->find(v_temp[nn - 2])->second);
        anEPM_TH_E = create_E_isoAng_from_energy(
          aTrack.GetKineticEnergy(),
          incoELM->second->find(v_temp.back())->second);
      }
 
      // E_isoAng for aTemp and aTrack.GetKineticEnergy()
      G4double mu = 1.0;
 
      // New Geant4 method - Stochastic interpolation of the final state
      E_isoAng anEPM_T_E_sampled;
      G4double rand_temp = G4UniformRand();
      if (rand_temp < (aTemp - tempLH.first) / (tempLH.second - tempLH.first))
        anEPM_T_E_sampled = std::move(anEPM_TH_E);
      else
        anEPM_T_E_sampled = std::move(anEPM_TL_E);
 
      mu = getMu(&anEPM_T_E_sampled);
 
      // Set Final State
      theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy());  // No energy change in Elastic
      G4double phi = CLHEP::twopi * G4UniformRand();
      G4double sint = std::sqrt(1 - mu * mu);
      theParticleChange.SetMomentumChange(sint * std::cos(phi), sint * std::sin(phi), mu);
    }
    delete dp;
 
    return &theParticleChange;
  }
  // Not thermal element
  // Neutron HP will handle
  return theHPElastic->ApplyYourself(aTrack, aNucleus,
                                     true);  // L. Thulliez 2021/05/04 (CEA-Saclay)
}

BuildPhysicsTable()

void G4ParticleHPThermalScattering::BuildPhysicsTable ( const G4ParticleDefinition & particle )

overridevirtual

Reimplemented from G4HadronicInteraction.

Definition at line 121 of file G4ParticleHPThermalScattering.cc.

{
  buildPhysicsTable();
  theHPElastic->BuildPhysicsTable(particle);
}

GetFatalEnergyCheckLevels()

const std::pair< G4double, G4double > G4ParticleHPThermalScattering::GetFatalEnergyCheckLevels ( ) const

overridevirtual

Reimplemented from G4HadronicInteraction.

Definition at line 1182 of file G4ParticleHPThermalScattering.cc.

{
  // max energy non-conservation is mass of heavy nucleus
  return std::pair<G4double, G4double>(10.0 * perCent, 350.0 * CLHEP::GeV);
}

ModelDescription()

void G4ParticleHPThermalScattering::ModelDescription ( std::ostream & outFile ) const

overridevirtual

Reimplemented from G4HadronicInteraction.

Definition at line 1210 of file G4ParticleHPThermalScattering.cc.

{
  outFile << "High Precision model based on thermal scattering data in\n"
          << "evaluated nuclear data libraries for neutrons below 5eV\n"
          << "on specific materials\n";
}

---

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

• G4ParticleHPThermalScattering.hh
• G4ParticleHPThermalScattering.cc