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