Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/de_excitation/fermi_breakup/include/G4FermiPhaseSpaceDecay.hh

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 25 //
 26 //
 27 // Hadronic Process: Phase space decay for the Fermi BreakUp model
 28 // by V. Lara
 29 //
 30 // Modifications:
 31 // 01.04.2011 General cleanup by V.Ivanchenko: 
 32 //          - IsotropicVector is inlined
 33 //          - Momentum computation return zero or positive value
 34 //          - DumpProblem method is added providing more information
 35 //          - Reduced usage of exotic std functions  
 36 //
 37 
 38 #ifndef G4FermiPhaseSpaceDecay_hh
 39 #define G4FermiPhaseSpaceDecay_hh 1
 40 
 41 #include "G4LorentzVector.hh"
 42 #include "G4ThreeVector.hh"
 43 #include "Randomize.hh"
 44 
 45 #include <vector>
 46 
 47 class G4Pow;
 48 
 49 class G4FermiPhaseSpaceDecay
 50 {
 51 public:
 52 
 53   G4FermiPhaseSpaceDecay();
 54   ~G4FermiPhaseSpaceDecay();
 55   
 56   std::vector<G4LorentzVector*>* Decay(G4double parent_mass, 
 57   const std::vector<G4double>& fragment_masses) const;
 58 
 59 private:
 60 
 61   inline G4double PtwoBody(G4double E, G4double P1, G4double P2) const;
 62   
 63   G4double BetaKopylov(G4int, CLHEP::HepRandomEngine*) const; 
 64 
 65   std::vector<G4LorentzVector*> * 
 66   KopylovNBodyDecay(G4double, const std::vector<G4double>&) const;
 67 
 68   G4FermiPhaseSpaceDecay(const G4FermiPhaseSpaceDecay&) = delete;
 69   const G4FermiPhaseSpaceDecay & operator=
 70   (const G4FermiPhaseSpaceDecay &) = delete; 
 71   G4bool operator==(const G4FermiPhaseSpaceDecay&) = delete;
 72   G4bool operator!=(const G4FermiPhaseSpaceDecay&) = delete;
 73 
 74   G4Pow* g4calc;
 75 };
 76 
 77 inline G4double 
 78 G4FermiPhaseSpaceDecay::PtwoBody(G4double E, G4double P1, G4double P2) const
 79 {
 80   G4double P = (E+P1+P2)*(E+P1-P2)*(E-P1+P2)*(E-P1-P2)/(4.0*E*E);
 81   return (P>0.0) ? std::sqrt(P) : 0.0; 
 82 }
 83 
 84 #endif
 85