Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/pre_equilibrium/exciton_model/src/G4HETCNeutron.cc

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 25 //
 26 //
 27 // by V. Lara
 28 //
 29 // Modified:
 30 // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor 
 31 //            the source, use G4Pow
 32 
 33 #include "G4HETCNeutron.hh"
 34 #include "G4PhysicalConstants.hh"
 35 #include "G4SystemOfUnits.hh"
 36 #include "G4Neutron.hh"
 37 #include "G4NuclearLevelData.hh"
 38 
 39 G4HETCNeutron::G4HETCNeutron() 
 40   : G4HETCFragment(G4Neutron::Neutron())
 41 {}
 42 
 43 G4double G4HETCNeutron::GetAlpha() const
 44 {
 45   return 0.76+2.2/theResA13;
 46 }
 47   
 48 G4double G4HETCNeutron::GetBeta() const
 49 {
 50   return (2.12/(theResA13*theResA13)-0.05)/GetAlpha(); // in MeV
 51 }
 52 
 53 G4double G4HETCNeutron::GetSpinFactor() const
 54 {
 55   // (2s+1)
 56   return 2.0;
 57 }
 58   
 59 G4double G4HETCNeutron::K(const G4Fragment& aFragment) const
 60 {
 61   // Number of protons in emitted fragment
 62   G4int Pa = theZ;
 63   // Number of neutrons in emitted fragment 
 64   G4int Na = theA - Pa;
 65 
 66   G4double r = G4double(theResZ)/G4double(theResA);
 67   
 68   G4int P = aFragment.GetNumberOfParticles();
 69   G4int H = aFragment.GetNumberOfHoles();
 70   
 71   G4double result = (P > 0) ? (H + Na/(1.0 - r))/P : 0.0;
 72   return result;
 73 }
 74 
 75 G4double G4HETCNeutron::SampleKineticEnergy(const G4Fragment& frag)
 76 {
 77   G4int H = frag.GetNumberOfHoles();
 78   G4int Pb = frag.GetNumberOfParticles();
 79   G4int Nb = Pb + H;
 80   G4double U = frag.GetExcitationEnergy();
 81   G4double g0 = 
 82     (6.0/CLHEP::pi2)*fNucData->GetLevelDensity(theFragZ,theFragA,U);
 83   
 84   G4double Ab = std::max(0.0, (G4double)(Pb*Pb+H*H+Pb-3*H)/(4.0*g0));
 85   G4double Emax = theMaxKinEnergy - Ab;
 86   
 87   G4double cut = GetBeta() / (GetBeta()+Emax/G4double(Nb+1));
 88   G4double x = (G4UniformRand() <= cut) ? BetaRand(Nb,1) : BetaRand(Nb,2);
 89 
 90   return Emax * (1.0 - x);
 91 }
 92