include/Geant4/G4CompetitiveFission.hh

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0025 //
0026 //
0027 //
0028 // Hadronic Process: Nuclear De-excitations
0029 // by V. Lara (Oct 1998)
0030
0031 #ifndef G4CompetitiveFission_h
0032 #define G4CompetitiveFission_h 1
0033
0034 #include "G4VEvaporationChannel.hh"
0035 #include "G4Fragment.hh"
0036 #include "G4VEmissionProbability.hh"
0037 #include "G4FissionParameters.hh"
0038 #include <CLHEP/Units/SystemOfUnits.h>
0039 #include "G4Exp.hh"
0040
0041 class G4VFissionBarrier;
0042 class G4VEmissionProbability;
0043 class G4VLevelDensityParameter;
0044 class G4PairingCorrection;
0045
0046 class G4CompetitiveFission : public G4VEvaporationChannel
0047 {
0048 public:
0049
0050   G4CompetitiveFission();
0051   ~G4CompetitiveFission() override;
0052
0053   void Initialise() override;
0054
0055   G4Fragment* EmittedFragment(G4Fragment* theNucleus) override;
0056
0057   G4double GetEmissionProbability(G4Fragment* theNucleus) override;
0058
0059   void SetFissionBarrier(G4VFissionBarrier * aBarrier);
0060
0061   void SetEmissionStrategy(G4VEmissionProbability * aFissionProb);
0062
0063   void SetLevelDensityParameter(G4VLevelDensityParameter * aLevelDensity);
0064
0065   inline G4double GetFissionBarrier(void) const;
0066
0067   inline G4double GetLevelDensityParameter(void) const;
0068
0069   inline G4double GetMaximalKineticEnergy(void) const;
0070
0071   G4CompetitiveFission(const G4CompetitiveFission &right) = delete;
0072   const G4CompetitiveFission & operator=(const G4CompetitiveFission &right) = delete;
0073   G4bool operator==(const G4CompetitiveFission &right) const = delete;
0074   G4bool operator!=(const G4CompetitiveFission &right) const = delete;
0075
0076 private:
0077
0078   // Sample AtomicNumber of Fission products
0079   G4int FissionAtomicNumber(G4int A);
0080
0081   G4double MassDistribution(G4double x, G4int A);
0082
0083   // Sample Charge of fission products
0084   G4int FissionCharge(G4int A, G4int Z, G4double Af);
0085
0086   // Sample Kinetic energy of fission products
0087   G4double FissionKineticEnergy(G4int A, G4int Z,
0088                 G4int Af1, G4int Zf1,
0089                 G4int Af2, G4int Zf2,
0090                 G4double U, G4double Tmax);
0091
0092   inline G4double Ratio(G4double A, G4double A11,
0093                         G4double B1, G4double A00) const;
0094
0095   inline G4double SymmetricRatio(G4int A, G4double A11) const;
0096
0097   inline G4double AsymmetricRatio(G4int A, G4double A11) const;
0098
0099   inline G4double LocalExp(G4double x) const;
0100
0101   // Maximal Kinetic Energy that can be carried by fragment
0102   G4double maxKineticEnergy{0.0};
0103   G4double fissionBarrier{0.0};
0104   G4double fissionProbability{0.0};
0105   G4double fFactor{1.0};
0106
0107   // For Fission barrier
0108   G4VFissionBarrier* theFissionBarrierPtr;
0109
0110   // For Fission probability emission
0111   G4VEmissionProbability* theFissionProbabilityPtr;
0112
0113   // For Level Density calculation
0114   G4VLevelDensityParameter* theLevelDensityPtr;
0115   G4PairingCorrection* pairingCorrection;
0116
0117   G4bool myOwnFissionProbability{true};
0118   G4bool myOwnFissionBarrier{true};
0119   G4bool myOwnLevelDensity{true};
0120
0121   G4FissionParameters theParam;
0122
0123   G4int theSecID;  // Creator model ID for the secondaries created by this model
0124   G4bool isInitialised{false};
0125 };
0126
0127 inline G4double G4CompetitiveFission::GetFissionBarrier(void) const
0128 {
0129   return fissionBarrier;
0130 }
0131
0132 inline G4double G4CompetitiveFission::GetMaximalKineticEnergy(void) const
0133 {
0134   return maxKineticEnergy;
0135 }
0136
0137 inline
0138 G4double G4CompetitiveFission::Ratio(G4double A, G4double A11,
0139                      G4double B1, G4double A00) const
0140 {
0141   G4double res;
0142   if (A11 >= A*0.5 && A11 <= (A00+10.0)) {
0143     G4double x = (A11-A00)/A;
0144     res = 1.0 - B1*x*x;
0145   } else {
0146     G4double x = 10.0/A;
0147     res = 1.0 - B1*x*x - 2.0*x*B1*(A11-A00-10.0)/A;
0148   }
0149   return res;
0150 }
0151
0152 inline
0153 G4double G4CompetitiveFission::AsymmetricRatio(G4int A, G4double A11) const
0154 {
0155   return Ratio(G4double(A),A11,23.5,134.0);
0156 }
0157
0158 inline
0159 G4double G4CompetitiveFission::SymmetricRatio(G4int A, G4double A11) const
0160 {
0161   G4double A0 = G4double(A);
0162   return Ratio(A0,A11,5.32,A0*0.5);
0163 }
0164
0165 inline G4double G4CompetitiveFission::LocalExp(G4double x) const
0166 {
0167   return (std::abs(x) < 8.) ? G4Exp(-0.5*x*x) : 0.0;
0168 }
0169
0170 #endif
0171
0172