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25 //
26 //
27 // ------------ G4GammaConversionToMuons physics process ------
28 // by H.Burkhardt, S. Kelner and R. Kokoulin, April 2002
29 // -----------------------------------------------------------------------------
30 //
31 // 05-08-04: suppression of .icc file (mma)
32 // 13-08-04, public ComputeCrossSectionPerAtom() and ComputeMeanFreePath() (mma)
33 //
34 // class description
35 //
36 // gamma ---> mu+ mu-
37 // inherit from G4VDiscreteProcess
38 //
39
40 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
41
42 #ifndef G4GammaConversionToMuons_h
43 #define G4GammaConversionToMuons_h 1
44
45 #include "G4ios.hh"
46 #include "globals.hh"
47 #include "Randomize.hh"
48 #include "G4VDiscreteProcess.hh"
49 #include "G4PhysicsTable.hh"
50 #include "G4PhysicsLogVector.hh"
51 #include "G4ParticleDefinition.hh"
52 #include "G4Element.hh"
53 #include "G4Step.hh"
54 #include <vector>
55
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57
58 class G4LossTableManager;
59 class G4BetheHeitler5DModel;
60
61 class G4GammaConversionToMuons : public G4VDiscreteProcess
62 {
63 public: // with description
64
65 explicit G4GammaConversionToMuons(
66 const G4String& processName ="GammaToMuPair",
67 G4ProcessType type = fElectromagnetic);
68
69 ~G4GammaConversionToMuons() override;
70
71 G4bool IsApplicable(const G4ParticleDefinition&) override;
72 // true for Gamma only.
73
74 void BuildPhysicsTable(const G4ParticleDefinition&) override;
75 // here dummy, the total cross section parametrization is used rather
76 // than tables, just calling PrintInfoDefinition
77
78 void PrintInfoDefinition();
79 // Print few lines of informations about the process: validity range,
80 // origine ..etc..
81 // Invoked by BuildThePhysicsTable().
82
83 void SetCrossSecFactor(G4double fac);
84 // Set the factor to artificially increase the crossSection (default 1)
85
86 inline G4double GetCrossSecFactor() const { return CrossSecFactor;}
87 // Get the factor to artificially increase the cross section
88
89 G4double GetMeanFreePath(const G4Track& aTrack,
90 G4double previousStepSize,
91 G4ForceCondition* condition) override;
92 // It returns the MeanFreePath of the process for the current track :
93 // (energy, material)
94 // The previousStepSize and G4ForceCondition* are not used.
95 // This function overloads a virtual function of the base class.
96 // It is invoked by the ProcessManager of the Particle.
97
98 G4double GetCrossSectionPerAtom(const G4DynamicParticle* aDynamicGamma,
99 const G4Element* anElement);
100 // It returns the total CrossSectionPerAtom of the process,
101 // for the current DynamicGamma (energy), in anElement.
102
103 G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
104 const G4Step& aStep) override;
105 // It computes the final state of the process (at end of step),
106 // returned as a ParticleChange object.
107 // This function overloads a virtual function of the base class.
108 // It is invoked by the ProcessManager of the Particle.
109
110 G4double ComputeCrossSectionPerAtom(G4double GammaEnergy, G4int Z);
111
112 G4double ComputeMeanFreePath (G4double GammaEnergy,
113 const G4Material* aMaterial);
114
115 // hide assignment operator as private
116 G4GammaConversionToMuons&
117 operator=(const G4GammaConversionToMuons &right) = delete;
118 G4GammaConversionToMuons(const G4GammaConversionToMuons& ) = delete;
119
120 private:
121
122 const G4Element* SelectRandomAtom(const G4DynamicParticle* aDynamicGamma,
123 const G4Material* aMaterial);
124
125 G4double Mmuon;
126 G4double Rc;
127 G4double LimitEnergy; // energy limit for accurate x-section
128 G4double LowestEnergyLimit; // low energy limit of the model
129 G4double HighestEnergyLimit; // high energy limit of the model
130 G4double Energy5DLimit = 0.0; // high energy limit for 5D final state sampling
131
132 G4double MeanFreePath = DBL_MAX;// actual MeanFreePath (current medium)
133 G4double CrossSecFactor = 1.0; // factor to artificially increase
134 // the cross section
135
136 G4LossTableManager* fManager;
137 G4BetheHeitler5DModel* f5Dmodel = nullptr;
138 const G4ParticleDefinition* theGamma;
139 const G4ParticleDefinition* theMuonPlus;
140 const G4ParticleDefinition* theMuonMinus;
141 std::vector<G4double> temp;
142 };
143
144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
145
146 #endif
147
148