G4HadronHElasticPhysics.cc

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//---------------------------------------------------------------------------
//
// ClassName:   G4HadronHElasticPhysics
//
// Author: 23 November 2006 V. Ivanchenko
//
// Modified:
// 21.03.07 (V.Ivanchenko) Use G4BGGNucleonElasticXS and G4BGGPionElasticXS; 
//                         Reduce thresholds for HE and Q-models to zero
// 03.06.2010 V.Ivanchenko cleanup constructors and ConstructProcess method
// 06.06.2014 A.Ribon      Use the current best elastic models.
//
//----------------------------------------------------------------------------
//
 
#include "G4HadronHElasticPhysics.hh"
 
#include "G4SystemOfUnits.hh"
#include "G4ParticleDefinition.hh"
#include "G4ProcessManager.hh"
 
#include "G4MesonConstructor.hh"
#include "G4BaryonConstructor.hh"
#include "G4IonConstructor.hh"
#include "G4Neutron.hh"
 
#include "G4HadronElasticProcess.hh"
#include "G4HadronElastic.hh"
#include "G4ChipsElasticModel.hh"
#include "G4AntiNuclElastic.hh"
#include "G4DiffuseElastic.hh"
#include "G4NuclNuclDiffuseElastic.hh"
 
#include "G4CrossSectionElastic.hh"
#include "G4BGGNucleonElasticXS.hh"
#include "G4BGGPionElasticXS.hh"
#include "G4NeutronElasticXS.hh"
#include "G4ChipsKaonMinusElasticXS.hh"
#include "G4ChipsKaonPlusElasticXS.hh"
#include "G4ChipsKaonZeroElasticXS.hh"
#include "G4ChipsHyperonElasticXS.hh"
#include "G4ChipsAntiBaryonElasticXS.hh"
#include "G4ComponentGGHadronNucleusXsc.hh"
#include "G4ComponentGGNuclNuclXsc.hh"
#include "G4CrossSectionDataSetRegistry.hh"
 
#include "G4LMsdGenerator.hh"
#include "G4DiffElasticRatio.hh"
#include "G4AutoDelete.hh"
 
#include "G4HadronicParameters.hh"
#include "G4HadronicBuilder.hh"
#include "G4HadParticles.hh"
 
 
// factory
#include "G4PhysicsConstructorFactory.hh"
//
G4_DECLARE_PHYSCONSTR_FACTORY( G4HadronHElasticPhysics );
 
G4ThreadLocal G4DiffElasticRatio* G4HadronHElasticPhysics::diffRatio = nullptr;
 
G4HadronHElasticPhysics::G4HadronHElasticPhysics( G4int ver, G4bool diffraction)
  : G4VPhysicsConstructor( "hElastic_BEST" ), verbose( ver ), 
    fDiffraction(diffraction) 
{
  if ( verbose > 1 ) { 
    G4cout << "### G4HadronHElasticPhysics: " << GetPhysicsName() 
       << "  low-mass diffraction: " << fDiffraction << G4endl; 
  }
}
 
G4HadronHElasticPhysics::~G4HadronHElasticPhysics() {}
 
 
void G4HadronHElasticPhysics::ConstructParticle() {
  // G4cout << "G4HadronElasticPhysics::ConstructParticle" << G4endl;
  G4MesonConstructor pMesonConstructor;
  pMesonConstructor.ConstructParticle();
 
  G4BaryonConstructor pBaryonConstructor;
  pBaryonConstructor.ConstructParticle();
 
  //  Construct light ions
  G4IonConstructor pConstructor;
  pConstructor.ConstructParticle();  
}
 
void G4HadronHElasticPhysics::ConstructProcess() {
 
  const G4double elimitDiffuse = 0.0;
  const G4double elimitAntiNuc = 100.0*MeV;
  const G4double delta = 0.1*MeV;
 
  if ( verbose > 1 ) {
    G4cout << "### HadronHElasticPhysics::ConstructProcess: lower energy limit for DiffuseElastic : " 
       << elimitDiffuse/GeV << " GeV" << G4endl
           << "                                             transition energy for anti-nuclei : " 
       << elimitAntiNuc/GeV << " GeV" << G4endl;
  }
 
  G4AntiNuclElastic* anuc = new G4AntiNuclElastic();
  anuc->SetMinEnergy( elimitAntiNuc );
  G4CrossSectionElastic* anucxs = 
    new G4CrossSectionElastic( anuc->GetComponentCrossSection() );
 
  G4HadronElastic* lhep = new G4HadronElastic();
  lhep->SetMaxEnergy( elimitAntiNuc + delta );
 
  G4HadronElastic* lhep0 = new G4HadronElastic();
 
  // Three instances of Chips elastic model: one used everywhere,
  // one used below a energy threshold, and one used only for the
  // hydrogen element.
  G4ChipsElasticModel* chips1 = new G4ChipsElasticModel();
  G4ChipsElasticModel* chips2 = new G4ChipsElasticModel();
  chips2->SetMaxEnergy( elimitAntiNuc + delta );
  G4ChipsElasticModel* chipsH = new G4ChipsElasticModel();
  const G4ElementTable* theElementTable = G4Element::GetElementTable();
  for ( size_t i_ele = 0; i_ele < theElementTable->size(); i_ele++ ) {
    G4Element* element = (*theElementTable)[ i_ele ];
    if ( element->GetZ() > 1.0 ) chipsH->DeActivateFor( element );
  }
 
  G4NuclNuclDiffuseElastic* diffuseNuclNuclElastic = new G4NuclNuclDiffuseElastic();
  diffuseNuclNuclElastic->SetMinEnergy( elimitDiffuse );
 
  G4VCrossSectionDataSet* theComponentGGHadronNucleusData = 
    new G4CrossSectionElastic( new G4ComponentGGHadronNucleusXsc );
 
  G4VCrossSectionDataSet* theComponentGGNuclNuclData = 
    new G4CrossSectionElastic( new G4ComponentGGNuclNuclXsc() );
 
  G4LMsdGenerator* diffGen = nullptr;
  if(fDiffraction) {
    diffGen = new G4LMsdGenerator("LMsdDiffraction");
    diffRatio = new G4DiffElasticRatio();
    G4AutoDelete::Register(diffRatio);    
  }
  G4HadronElasticProcess* hel = nullptr;
 
  auto myParticleIterator=GetParticleIterator();
  myParticleIterator->reset();
  while( (*myParticleIterator)() ) {
 
    G4ParticleDefinition* particle = myParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();
    G4String pname = particle->GetParticleName();
 
    if ( pname == "anti_lambda"  || 
         pname == "anti_sigma-"  ||
         pname == "anti_sigma0"  || 
         pname == "anti_sigma+"  || 
         pname == "anti_xi-"     || 
         pname == "anti_xi0"     ||
         pname == "anti_omega-"  ||
         pname == "lambda"       || 
         pname == "sigma-"       ||
         pname == "sigma0"       || 
         pname == "sigma+"       || 
         pname == "xi-"          || 
         pname == "xi0"          ||
         pname == "omega-"
    ) {
      hel = new G4HadronElasticProcess();
      hel->AddDataSet( theComponentGGHadronNucleusData );
      hel->RegisterMe( chips1 );
      pmanager->AddDiscreteProcess( hel );
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if ( pname == "proton" ) {   
      hel = new G4HadronElasticProcess();
      hel->AddDataSet( new G4BGGNucleonElasticXS( particle ) );
      // To preserve reproducibility, a different instance of
      // G4DiffuseElastic must be used for each particle type.
      G4DiffuseElastic* protonDiffuseElastic = new G4DiffuseElastic();
      protonDiffuseElastic->SetMinEnergy( elimitDiffuse );
      hel->RegisterMe( chipsH );  // Use Chips only for Hydrogen element
      hel->RegisterMe( protonDiffuseElastic );
      pmanager->AddDiscreteProcess( hel );
      if(fDiffraction) { hel->SetDiffraction(diffGen, diffRatio); }
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if ( pname == "neutron" ) {   
      hel = new G4HadronElasticProcess();
      hel->AddDataSet(new G4NeutronElasticXS() );
      // To preserve reproducibility, a different instance of
      // G4DiffuseElastic must be used for each particle type.
      G4DiffuseElastic* neutronDiffuseElastic = new G4DiffuseElastic();
      neutronDiffuseElastic->SetMinEnergy( elimitDiffuse );
      hel->RegisterMe( chipsH );  // Use Chips only for Hydrogen element
      hel->RegisterMe( neutronDiffuseElastic );
      pmanager->AddDiscreteProcess( hel );
      if(fDiffraction) { hel->SetDiffraction(diffGen, diffRatio); }
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " 
           << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if ( pname == "pi-" || pname == "pi+" ) { 
      hel = new G4HadronElasticProcess();
      hel->AddDataSet( new G4BGGPionElasticXS( particle ) );
      // To preserve reproducibility, a different instance of
      // G4DiffuseElastic must be used for each particle type.
      G4DiffuseElastic* dElastic = new G4DiffuseElastic();
      dElastic->SetMinEnergy( elimitDiffuse );
      hel->RegisterMe( chipsH );  // Use Chips only for Hydrogen element
      hel->RegisterMe( dElastic );
      pmanager->AddDiscreteProcess( hel );
      if(fDiffraction) { hel->SetDiffraction(diffGen, diffRatio); }
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if ( pname == "kaon-"     || 
            pname == "kaon+"     || 
            pname == "kaon0S"    || 
            pname == "kaon0L" 
          ) {
      hel = new G4HadronElasticProcess();
      //AR-14Aug2017 : Replaced Chips elastic kaon cross sections with
      //               Grichine's Glauber-Gribov ones. In this way, the
      //               total (elastic + inelastic) kaon cross sections
      //               are consistent with the PDG ones.
      //               For the time being, kept Chips elastic as
      //               final-state model.
      hel->AddDataSet( theComponentGGHadronNucleusData );
      hel->RegisterMe( chips1 );
      pmanager->AddDiscreteProcess( hel );
      if(fDiffraction) { hel->SetDiffraction(diffGen, diffRatio); }
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if(pname == "alpha"     ||
              pname == "deuteron"  ||
              pname == "triton"    ||
              pname == "He3"
             ) {
      hel = new G4HadronElasticProcess();
      hel->AddDataSet(theComponentGGNuclNuclData);
      hel->RegisterMe(lhep0);
      pmanager->AddDiscreteProcess(hel);
      if(verbose > 1) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if ( pname == "anti_proton"  ||  pname == "anti_neutron" ) {
      hel = new G4HadronElasticProcess();
      hel->AddDataSet( anucxs );
      hel->RegisterMe( chips2 );
      hel->RegisterMe( anuc );
      pmanager->AddDiscreteProcess( hel );
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
 
    } else if ( pname == "anti_deuteron"  ||
                pname == "anti_triton"    ||
                pname == "anti_He3"       ||
                pname == "anti_alpha"
              ) {
      hel = new G4HadronElasticProcess();
      hel->AddDataSet( anucxs );
      hel->RegisterMe( lhep );
      hel->RegisterMe( anuc );
      pmanager->AddDiscreteProcess( hel );
      if ( verbose > 1 ) {
    G4cout << "### HadronElasticPhysics: " << hel->GetProcessName()
           << " added for " << particle->GetParticleName() << G4endl;
      }
    }
  }
 
  // Charm and bottom hadrons
  if ( G4HadronicParameters::Instance()->EnableBCParticles() ) {
    G4HadronicBuilder::BuildElastic( G4HadParticles::GetBCHadrons() );
  }
 
}