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1 //
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24 // ********************************************************************
25 // ********************************************************************
26 // *********************************************************************
27 // | |
28 // | G4LowEPComptonModel-- Geant4 Monash University |
29 // | low energy Compton scattering model. |
30 // | J. M. C. Brown, Monash University, Australia |
31 // | ## Unpolarised photons only ## |
32 // | |
33 // | |
34 // *********************************************************************
35 // | |
36 // | The following is a Geant4 class to simulate the process of |
37 // | bound electron Compton scattering. General code structure is |
38 // | based on G4LowEnergyCompton.cc and G4LivermoreComptonModel.cc. |
39 // | Algorithms for photon energy, and ejected Compton electron |
40 // | direction taken from: |
41 // | |
42 // | J. M. C. Brown, M. R. Dimmock, J. E. Gillam and D. M. Paganin, |
43 // | "A low energy bound atomic electron Compton scattering model |
44 // | for Geant4", NIMB, Vol. 338, 77-88, 2014. |
45 // | |
46 // | The author acknowledges the work of the Geant4 collaboration |
47 // | in developing the following algorithms that have been employed |
48 // | or adapeted for the present software: |
49 // | |
50 // | # sampling of photon scattering angle, |
51 // | # target element selection in composite materials, |
52 // | # target shell selection in element, |
53 // | # and sampling of bound electron momentum from Compton profiles. |
54 // | |
55 // *********************************************************************
56 // | |
57 // | History: |
58 // | -------- |
59 // | |
60 // | Nov. 2011 JMCB - First version |
61 // | Feb. 2012 JMCB - Migration to Geant4 9.5 |
62 // | Sep. 2012 JMCB - Final fixes for Geant4 9.6 |
63 // | Feb. 2013 JMCB - Geant4 9.6 FPE fix for bug 1426 |
64 // | Jan. 2015 JMCB - Migration to MT (Based on Livermore |
65 // | implementation) |
66 // | Feb. 2016 JMCB - Geant4 10.2 FPE fix for bug 1676 |
67 // | |
68 // *********************************************************************
69
70 #ifndef G4LowEPComptonModel_h
71 #define G4LowEPComptonModel_h 1
72
73 #include "G4VEmModel.hh"
74 #include "G4PhysicsFreeVector.hh"
75
76 class G4ParticleChangeForGamma;
77 class G4VAtomDeexcitation;
78 class G4ShellData;
79 class G4DopplerProfile;
80
81 class G4LowEPComptonModel : public G4VEmModel
82 {
83
84 public:
85
86 explicit G4LowEPComptonModel(const G4ParticleDefinition* p = nullptr,
87 const G4String& nam = "LowEPComptonModel");
88 virtual ~G4LowEPComptonModel();
89
90 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
91 void InitialiseLocal(const G4ParticleDefinition*,
92 G4VEmModel* masterModel) override;
93
94 void InitialiseForElement(const G4ParticleDefinition*, G4int Z) override;
95
96 G4double ComputeCrossSectionPerAtom( const G4ParticleDefinition*,
97 G4double kinEnergy,
98 G4double Z,
99 G4double A=0,
100 G4double cut=0,
101 G4double emax=DBL_MAX ) override;
102
103 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
104 const G4MaterialCutsCouple*,
105 const G4DynamicParticle*,
106 G4double tmin,
107 G4double maxEnergy) override;
108
109 G4LowEPComptonModel & operator=(const G4LowEPComptonModel &right) = delete;
110 G4LowEPComptonModel(const G4LowEPComptonModel&) = delete;
111
112 private:
113 void ReadData(size_t Z, const char* path = 0);
114 G4double ComputeScatteringFunction(G4double x, G4int Z);
115
116 G4ParticleChangeForGamma* fParticleChange;
117 G4VAtomDeexcitation* fAtomDeexcitation;
118 static G4ShellData* shellData;
119 static G4DopplerProfile* profileData;
120
121 static const G4int maxZ = 99;
122 static G4PhysicsFreeVector* data[100];
123 static const G4double ScatFuncFitParam[101][9];
124
125 G4int verboseLevel;
126 G4bool isInitialised;
127 };
128
129 //****************************************************************************
130
131 #endif
132