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Geant4/physics_lists/constructors/hadron_elastic/src/G4HadronElasticPhysicsPHP.cc

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 25 //
 26 //---------------------------------------------------------------------------
 27 //
 28 // ClassName:   G4HadronElasticPhysicsPHP
 29 //
 30 // Author: 2012, P. Arce
 31 //
 32 // Modified: 12.10.2023 V.Ivanchenko added usage of alternative neutron
 33 //                      HP model and cross section
 34 //
 35 //----------------------------------------------------------------------------
 36 //
 37 // neutron HP model for E < 20 MeV
 38 
 39 #include "G4HadronElasticPhysicsPHP.hh"
 40 #include "G4Neutron.hh"
 41 #include "G4HadronicProcess.hh"
 42 #include "G4ProcessManager.hh"
 43 #include "G4HadronElastic.hh"
 44 #include "G4ParticleHPElastic.hh"
 45 #include "G4ParticleHPElasticData.hh"
 46 #include "G4SystemOfUnits.hh"
 47 #include "G4HadronicParameters.hh"
 48 #include "G4PhysListUtil.hh"
 49 
 50 // factory
 51 #include "G4PhysicsConstructorFactory.hh"
 52 //
 53 G4_DECLARE_PHYSCONSTR_FACTORY(G4HadronElasticPhysicsPHP);
 54 //
 55 
 56 G4HadronElasticPhysicsPHP::G4HadronElasticPhysicsPHP(G4int ver)
 57   : G4HadronElasticPhysics(ver, "hElasticPhysics_PHP")
 58 {
 59   if(ver > 1) { 
 60     G4cout << "### G4HadronElasticPhysicsPHP: " << GetPhysicsName() 
 61      << G4endl; 
 62   }
 63   auto param = G4HadronicParameters::Instance();
 64   // HP is inconsistent with the neutron general process
 65   param->SetEnableNeutronGeneralProcess(false);
 66 }
 67 
 68 void G4HadronElasticPhysicsPHP::ConstructProcess()
 69 {
 70   G4HadronElasticPhysics::ConstructProcess();
 71 
 72   const G4ParticleDefinition* neutron = G4Neutron::Neutron();
 73   G4HadronicProcess* hel = G4PhysListUtil::FindElasticProcess( neutron );
 74   if ( nullptr == hel ) {
 75     hel = new G4HadronicProcess();
 76     neutron->GetProcessManager()->AddDiscreteProcess(hel);
 77   } else {
 78     G4HadronElastic* he = GetElasticModel(neutron);
 79     he->SetMinEnergy(19.5*CLHEP::MeV); 
 80   }
 81   // apply alternative cross section
 82   hel->AddDataSet( new G4ParticleHPElasticData() );
 83 
 84   // add HP elastic
 85   auto he = new G4ParticleHPElastic();
 86   he->SetMaxEnergy(20*CLHEP::MeV); 
 87   hel->RegisterMe( he );
 88 
 89   if ( G4HadronicParameters::Instance()->GetVerboseLevel() > 1 ) {
 90     G4cout << "### HadronElasticPhysicsPHP is constructed " 
 91      << G4endl;
 92   }
 93 }
 94 
 95 
 96