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26 //
27 //---------------------------------------------------------------------------
28 //
29 // ClassName: G4HadronElasticPhysicsHPT
30 //
31 // Author: Alberto Ribon (CERN), April 2023
32 //
33 // This class inherits from G4HadronElasticPhysicsHP and activates
34 // the special treatment of elastic scattering of thermal neutrons
35 // (i.e. with kinetic energy below 4 eV).
36 // This special treatment, called Thermal Scattering Law (TSL), is based on
37 // the S(alpha, beta) approach, which relies on both experimental measurements
38 // and molecular dynamics calculations.
39 //
40 // Modified:
41 //
42 //----------------------------------------------------------------------------
43 //
44
45 #include "G4HadronElasticPhysicsHPT.hh"
46 #include "G4SystemOfUnits.hh"
47 #include "G4Neutron.hh"
48 #include "G4ParticleDefinition.hh"
49 #include "G4HadronicProcess.hh"
50 #include "G4ParticleHPThermalScattering.hh"
51 #include "G4ParticleHPThermalScatteringData.hh"
52 #include "G4HadronicParameters.hh"
53 #include "G4PhysListUtil.hh"
54 #include "G4PhysicsConstructorFactory.hh"
55
56
57 G4_DECLARE_PHYSCONSTR_FACTORY( G4HadronElasticPhysicsHPT );
58
59
60 G4HadronElasticPhysicsHPT::G4HadronElasticPhysicsHPT( G4int ver ) : G4HadronElasticPhysicsHP( ver ) {
61 if ( ver > 1 ) G4cout << "### G4HadronElasticPhysicsHPT: " << GetPhysicsName() << G4endl;
62 }
63
64
65 void G4HadronElasticPhysicsHPT::ConstructProcess() {
66 G4HadronElasticPhysicsHP::ConstructProcess();
67 const G4Neutron* neutron = G4Neutron::Neutron();
68 G4HadronicProcess* neutronElasticProcess = G4PhysListUtil::FindElasticProcess( neutron );
69 if ( neutronElasticProcess == nullptr ) {
70 G4cout << "### " << GetPhysicsName()
71 << " WARNING: Fail to add thermal neutron scattering" << G4endl;
72 return;
73 }
74 std::size_t sizeInteractionList = neutronElasticProcess->GetHadronicInteractionList().size();
75 if ( sizeInteractionList < 1 ) {
76 G4cout << "### " << GetPhysicsName()
77 << " WARNING: Fail to add thermal neutron scattering ! sizeInteractionList="
78 << sizeInteractionList << G4endl;
79 return;
80 }
81 neutronElasticProcess->GetHadronicInteractionList()[ sizeInteractionList-1 ]->SetMinEnergy( 4.0*CLHEP::eV );
82 neutronElasticProcess->RegisterMe( new G4ParticleHPThermalScattering );
83 neutronElasticProcess->AddDataSet( new G4ParticleHPThermalScatteringData );
84 if ( G4HadronicParameters::Instance()->GetVerboseLevel() > 1 ) {
85 G4cout << "### HadronElasticPhysicsHPT is constructed " << G4endl;
86 }
87 }
88