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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4MuPairProductionModel
33 //
34 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 //
36 // Creation date: 18.05.2002
37 //
38 // Modifications:
39 //
40 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
41 // 27-01-03 Make models region aware (V.Ivanchenko)
42 // 13-02-03 Add name (V.Ivanchenko)
43 // 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
44 // 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
45 // 13-02-06 Add ComputeCrossSectionPerAtom (mma)
46 // 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov)
47 // 11-10-07 Add ignoreCut flag (V.Ivanchenko)
48 // 28-02-08 Reorganized protected methods and members (V.Ivanchenko)
49 //
50 // Class Description:
51 //
52 // Implementation of e+e- pair production by muons
53 // A.G. Bogdanov et al., IEEE Trans. Nuc. Sci., Vol.53, No.2, 2006
54 // Base class for all pair production models for muons and hadrons.
55 //
56 // -------------------------------------------------------------------
57 //
58
59 #ifndef G4MuPairProductionModel_h
60 #define G4MuPairProductionModel_h 1
61
62 #include "G4VEmModel.hh"
63 #include "G4NistManager.hh"
64 #include "G4ElementData.hh"
65 #include "G4Physics2DVector.hh"
66 #include <vector>
67
68 class G4Element;
69 class G4ParticleChangeForLoss;
70 class G4ParticleChangeForGamma;
71
72 class G4MuPairProductionModel : public G4VEmModel
73 {
74 public:
75
76 explicit G4MuPairProductionModel(const G4ParticleDefinition* p = nullptr,
77 const G4String& nam = "muPairProd");
78
79 ~G4MuPairProductionModel() override = default;
80
81 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
82
83 void InitialiseLocal(const G4ParticleDefinition*,
84 G4VEmModel* masterModel) override;
85
86 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
87 G4double kineticEnergy,
88 G4double Z, G4double A,
89 G4double cutEnergy,
90 G4double maxEnergy) override;
91
92 G4double ComputeDEDXPerVolume(const G4Material*,
93 const G4ParticleDefinition*,
94 G4double kineticEnergy,
95 G4double cutEnergy) override;
96
97 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
98 const G4MaterialCutsCouple*,
99 const G4DynamicParticle*,
100 G4double tmin,
101 G4double maxEnergy) override;
102
103 G4double MinPrimaryEnergy(const G4Material*,
104 const G4ParticleDefinition*,
105 G4double) override;
106
107 virtual G4double
108 ComputeDMicroscopicCrossSection(G4double tkin, G4double Z,
109 G4double pairEnergy);
110
111 inline void SetLowestKineticEnergy(G4double e);
112
113 inline void SetParticle(const G4ParticleDefinition*);
114
115 // hide assignment operator and copy constructor
116 G4MuPairProductionModel & operator=
117 (const G4MuPairProductionModel &right) = delete;
118 G4MuPairProductionModel(const G4MuPairProductionModel&) = delete;
119
120 protected:
121
122 G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut,
123 G4double tmax);
124
125 G4double ComputeMicroscopicCrossSection(G4double tkin,
126 G4double Z,
127 G4double cut);
128
129 G4double FindScaledEnergy(G4int Z, G4double rand, G4double logTkin,
130 G4double yymin, G4double yymax);
131
132 inline G4double MaxSecondaryEnergyForElement(G4double kineticEnergy,
133 G4double Z);
134
135 void MakeSamplingTables();
136
137 void StoreTables() const;
138
139 G4bool RetrieveTables();
140
141 virtual void DataCorrupted(G4int Z, G4double logTkin) const;
142
143 G4ParticleChangeForLoss* fParticleChange = nullptr;
144 const G4ParticleDefinition* particle = nullptr;
145 G4NistManager* nist = nullptr;
146
147 G4double factorForCross;
148 G4double sqrte;
149 G4double particleMass = 0.0;
150 G4double z13 = 0.0;
151 G4double z23 = 0.0;
152 G4double lnZ = 0.0;
153
154 G4double minPairEnergy;
155 G4double lowestKinEnergy;
156
157 G4double emin;
158 G4double emax;
159 G4double ymin = -5.0;
160 G4double dy = 0.005;
161
162 G4int currentZ = 0;
163 G4int nYBinPerDecade = 4;
164 std::size_t nbiny = 1000;
165 std::size_t nbine = 0;
166
167 G4bool fTableToFile = false;
168
169 // static members
170 static const G4int NZDATPAIR = 5;
171 static const G4int NINTPAIR = 8;
172 static const G4int ZDATPAIR[NZDATPAIR];
173 static const G4double xgi[NINTPAIR];
174 static const G4double wgi[NINTPAIR];
175
176 private:
177
178 G4ParticleDefinition* theElectron;
179 G4ParticleDefinition* thePositron;
180 G4String dataName{""};
181 };
182
183 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
184
185 inline void G4MuPairProductionModel::SetLowestKineticEnergy(G4double e)
186 {
187 lowestKinEnergy = e;
188 }
189
190 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
191
192 inline
193 void G4MuPairProductionModel::SetParticle(const G4ParticleDefinition* p)
194 {
195 if(nullptr == particle) {
196 particle = p;
197 particleMass = particle->GetPDGMass();
198 }
199 }
200
201 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
202
203 inline G4double
204 G4MuPairProductionModel::MaxSecondaryEnergyForElement(G4double kineticEnergy,
205 G4double ZZ)
206 {
207 G4int Z = G4lrint(ZZ);
208 if(Z != currentZ) {
209 currentZ = Z;
210 z13 = nist->GetZ13(Z);
211 z23 = z13*z13;
212 lnZ = nist->GetLOGZ(Z);
213 }
214 return kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13);
215 }
216
217 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
218
219 #endif
220