include/Geant4/G4ParticleHPThermalBoost.hh

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0025 //
0026 //
0027 // 081024 G4NucleiPropertiesTable:: to G4NucleiProperties::
0028 //
0029 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
0030 //
0031 #ifndef G4ParticleHPThermalBoost_h
0032 #define G4ParticleHPThermalBoost_h
0033
0034 #include "G4Electron.hh"
0035 #include "G4Element.hh"
0036 #include "G4HadProjectile.hh"
0037 #include "G4Neutron.hh"
0038 #include "G4NucleiProperties.hh"
0039 #include "G4Nucleus.hh"
0040 #include "G4ReactionProduct.hh"
0041
0042 class G4ParticleHPThermalBoost
0043 {
0044   public:
0045     G4double GetThermalEnergy(const G4HadProjectile& aP, const G4Element* anE, G4double aT)
0046     {
0047       G4double theA = anE->GetN();
0048       G4double theZ = anE->GetZ();
0049       return GetThermalEnergy(aP, theA, theZ, aT);
0050     }
0051
0052     G4double GetThermalEnergy(const G4HadProjectile& aP, G4double theA, G4double theZ, G4double aT)
0053     {
0054       // prepare neutron
0055       G4double eKinetic = aP.GetKineticEnergy();
0056       G4ReactionProduct theNeutronRP(const_cast<G4ParticleDefinition*>(aP.GetDefinition()));
0057       theNeutronRP.SetMomentum(aP.Get4Momentum().vect());
0058       theNeutronRP.SetKineticEnergy(eKinetic);
0059       G4ThreeVector neuVelo = (1. / aP.GetDefinition()->GetPDGMass()) * theNeutronRP.GetMomentum();
0060
0061       // prepare properly biased thermal nucleus
0062       G4Nucleus aNuc;
0063       G4double eps = 0.0001;
0064       G4double eleMass;
0065       eleMass = (G4NucleiProperties::GetNuclearMass(static_cast<G4int>(theA + eps),
0066                                                     static_cast<G4int>(theZ + eps)))
0067                 / G4Neutron::Neutron()->GetPDGMass();
0068
0069       G4ReactionProduct aThermalNuc = aNuc.GetBiasedThermalNucleus(eleMass, neuVelo, aT);
0070
0071       // boost to rest system and return
0072       G4ReactionProduct boosted;
0073       boosted.Lorentz(theNeutronRP, aThermalNuc);
0074       return boosted.GetKineticEnergy();
0075     }
0076 };
0077 #endif