Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/particle_hp/include/G4ParticleHPThermalBoost.hh

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 25 //
 26 //
 27 // 081024 G4NucleiPropertiesTable:: to G4NucleiProperties::
 28 //
 29 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
 30 //
 31 #ifndef G4ParticleHPThermalBoost_h
 32 #define G4ParticleHPThermalBoost_h
 33 
 34 #include "G4Electron.hh"
 35 #include "G4Element.hh"
 36 #include "G4HadProjectile.hh"
 37 #include "G4Neutron.hh"
 38 #include "G4NucleiProperties.hh"
 39 #include "G4Nucleus.hh"
 40 #include "G4ReactionProduct.hh"
 41 
 42 class G4ParticleHPThermalBoost
 43 {
 44   public:
 45     G4double GetThermalEnergy(const G4HadProjectile& aP, const G4Element* anE, G4double aT)
 46     {
 47       G4double theA = anE->GetN();
 48       G4double theZ = anE->GetZ();
 49       return GetThermalEnergy(aP, theA, theZ, aT);
 50     }
 51 
 52     G4double GetThermalEnergy(const G4HadProjectile& aP, G4double theA, G4double theZ, G4double aT)
 53     {
 54       // prepare neutron
 55       G4double eKinetic = aP.GetKineticEnergy();
 56       G4ReactionProduct theNeutronRP(const_cast<G4ParticleDefinition*>(aP.GetDefinition()));
 57       theNeutronRP.SetMomentum(aP.Get4Momentum().vect());
 58       theNeutronRP.SetKineticEnergy(eKinetic);
 59       G4ThreeVector neuVelo = (1. / aP.GetDefinition()->GetPDGMass()) * theNeutronRP.GetMomentum();
 60 
 61       // prepare properly biased thermal nucleus
 62       G4Nucleus aNuc;
 63       G4double eps = 0.0001;
 64       G4double eleMass;
 65       eleMass = (G4NucleiProperties::GetNuclearMass(static_cast<G4int>(theA + eps),
 66                                                     static_cast<G4int>(theZ + eps)))
 67                 / G4Neutron::Neutron()->GetPDGMass();
 68 
 69       G4ReactionProduct aThermalNuc = aNuc.GetBiasedThermalNucleus(eleMass, neuVelo, aT);
 70 
 71       // boost to rest system and return
 72       G4ReactionProduct boosted;
 73       boosted.Lorentz(theNeutronRP, aThermalNuc);
 74       return boosted.GetKineticEnergy();
 75     }
 76 };
 77 #endif
 78