G4HadronElasticPhysicsHPT.cc

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//---------------------------------------------------------------------------
//
// ClassName:   G4HadronElasticPhysicsHPT
//
// Author: Alberto Ribon (CERN), April 2023
//
// This class inherits from G4HadronElasticPhysicsHP and activates
// the special treatment of elastic scattering of thermal neutrons
// (i.e. with kinetic energy below 4 eV).
// This special treatment, called Thermal Scattering Law (TSL), is based on
// the S(alpha, beta) approach, which relies on both experimental measurements
// and molecular dynamics calculations.
//
// Modified:
//
//----------------------------------------------------------------------------
//
 
#include "G4HadronElasticPhysicsHPT.hh"
#include "G4SystemOfUnits.hh"
#include "G4Neutron.hh"
#include "G4ParticleDefinition.hh"
#include "G4HadronicProcess.hh"
#include "G4ParticleHPThermalScattering.hh"
#include "G4ParticleHPThermalScatteringData.hh"
#include "G4HadronicParameters.hh"
#include "G4PhysListUtil.hh"
#include "G4PhysicsConstructorFactory.hh"
 
 
G4_DECLARE_PHYSCONSTR_FACTORY( G4HadronElasticPhysicsHPT );
 
 
G4HadronElasticPhysicsHPT::G4HadronElasticPhysicsHPT( G4int ver ) : G4HadronElasticPhysicsHP( ver ) {
  if ( ver > 1 ) G4cout << "### G4HadronElasticPhysicsHPT: " << GetPhysicsName() << G4endl;
}
 
 
void G4HadronElasticPhysicsHPT::ConstructProcess() {
  G4HadronElasticPhysicsHP::ConstructProcess();
  const G4Neutron* neutron = G4Neutron::Neutron();
  G4HadronicProcess* neutronElasticProcess = G4PhysListUtil::FindElasticProcess( neutron );
  if ( neutronElasticProcess == nullptr ) {
    G4cout << "### " << GetPhysicsName() 
           << " WARNING: Fail to add thermal neutron scattering" << G4endl;
    return;
  }
  std::size_t sizeInteractionList = neutronElasticProcess->GetHadronicInteractionList().size();
  if ( sizeInteractionList < 1 ) {
    G4cout << "### " << GetPhysicsName() 
           << " WARNING: Fail to add thermal neutron scattering !  sizeInteractionList=" 
           << sizeInteractionList << G4endl;
    return;
  }
  neutronElasticProcess->GetHadronicInteractionList()[ sizeInteractionList-1 ]->SetMinEnergy( 4.0*CLHEP::eV );
  neutronElasticProcess->RegisterMe( new G4ParticleHPThermalScattering );
  neutronElasticProcess->AddDataSet( new G4ParticleHPThermalScatteringData );
  if ( G4HadronicParameters::Instance()->GetVerboseLevel() > 1 ) {
    G4cout << "### HadronElasticPhysicsHPT is constructed " << G4endl;
  }
}