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Geant4/processes/electromagnetic/standard/include/G4BetheHeitlerModel.hh

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Differences between /processes/electromagnetic/standard/include/G4BetheHeitlerModel.hh (Version 11.3.0) and /processes/electromagnetic/standard/include/G4BetheHeitlerModel.hh (Version 11.1.1)


  1 //                                                  1 //
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 16 // * for the full disclaimer and the limitatio     16 // * for the full disclaimer and the limitation of liability.         *
 17 // *                                               17 // *                                                                  *
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 19 // * technical work of the GEANT4 collaboratio     19 // * technical work of the GEANT4 collaboration.                      *
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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 //                                                 26 //
 27 // -------------------------------------------     27 // -------------------------------------------------------------------
 28 //                                                 28 //
 29 // GEANT4 Class header file                        29 // GEANT4 Class header file
 30 //                                                 30 //
 31 //                                                 31 //
 32 // File name:     G4BetheHeitlerModel              32 // File name:     G4BetheHeitlerModel
 33 //                                                 33 //
 34 // Author:        Vladimir Ivanchenko on base      34 // Author:        Vladimir Ivanchenko on base of Michel Maire code
 35 //                                                 35 //
 36 // Creation date: 19.04.2005                       36 // Creation date: 19.04.2005
 37 //                                                 37 //
 38 // Modifications by Vladimir Ivanchenko, Miche     38 // Modifications by Vladimir Ivanchenko, Michel Maire, Mihaly Novak
 39 //                                                 39 //
 40 // Class Description:                              40 // Class Description:
 41 //                                                 41 //
 42 // Implementation of gamma conversion to e+e-      42 // Implementation of gamma conversion to e+e- in the field of a nucleus 
 43 // For details see Physics Reference Manual        43 // For details see Physics Reference Manual
 44                                                    44 
 45 // -------------------------------------------     45 // -------------------------------------------------------------------
 46 //                                                 46 //
 47                                                    47 
 48 #ifndef G4BetheHeitlerModel_h                      48 #ifndef G4BetheHeitlerModel_h
 49 #define G4BetheHeitlerModel_h 1                    49 #define G4BetheHeitlerModel_h 1
 50                                                    50 
 51 #include "G4VEmModel.hh"                           51 #include "G4VEmModel.hh"
 52 #include "G4PhysicsTable.hh"                       52 #include "G4PhysicsTable.hh"
 53 #include "G4Log.hh"                                53 #include "G4Log.hh"
 54                                                    54 
 55 #include <vector>                                  55 #include <vector>
 56                                                    56 
 57 class G4ParticleChangeForGamma;                    57 class G4ParticleChangeForGamma;
 58 class G4Pow;                                       58 class G4Pow;
 59 class G4EmElementXS;                           << 
 60                                                    59 
 61 class G4BetheHeitlerModel : public G4VEmModel      60 class G4BetheHeitlerModel : public G4VEmModel
 62 {                                                  61 {
 63                                                    62 
 64 public:                                            63 public:
 65                                                    64 
 66   explicit G4BetheHeitlerModel(const G4Particl     65   explicit G4BetheHeitlerModel(const G4ParticleDefinition* p = nullptr,
 67                                const G4String&     66                                const G4String& nam = "BetheHeitler");
 68                                                    67  
 69   ~G4BetheHeitlerModel() override;                 68   ~G4BetheHeitlerModel() override;
 70                                                    69 
 71   void Initialise(const G4ParticleDefinition*,     70   void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
 72                                                    71 
 73   void InitialiseLocal(const G4ParticleDefinit     72   void InitialiseLocal(const G4ParticleDefinition*, 
 74            G4VEmModel* masterModel) override;      73            G4VEmModel* masterModel) override;
 75                                                    74 
 76   G4double ComputeCrossSectionPerAtom(const G4     75   G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
 77               G4double kinEnergy,                  76               G4double kinEnergy, 
 78               G4double Z,                          77               G4double Z, 
 79               G4double A=0.,                       78               G4double A=0., 
 80               G4double cut=0.,                     79               G4double cut=0.,
 81               G4double emax=DBL_MAX) override;     80               G4double emax=DBL_MAX) override;
 82                                                    81 
 83   void SampleSecondaries(std::vector<G4Dynamic     82   void SampleSecondaries(std::vector<G4DynamicParticle*>*,
 84        const G4MaterialCutsCouple*,                83        const G4MaterialCutsCouple*,
 85        const G4DynamicParticle*,                   84        const G4DynamicParticle*,
 86        G4double tmin,                              85        G4double tmin,
 87        G4double maxEnergy) override;               86        G4double maxEnergy) override;
 88                                                    87 
 89   // hide assignment operator                      88   // hide assignment operator
 90   G4BetheHeitlerModel & operator=(const G4Beth     89   G4BetheHeitlerModel & operator=(const G4BetheHeitlerModel &right) = delete;
 91   G4BetheHeitlerModel(const  G4BetheHeitlerMod     90   G4BetheHeitlerModel(const  G4BetheHeitlerModel&) = delete;
 92                                                    91 
 93 protected:                                         92 protected:
 94                                                    93 
 95   inline G4double ScreenFunction1(const G4doub     94   inline G4double ScreenFunction1(const G4double delta);
 96                                                    95 
 97   inline G4double ScreenFunction2(const G4doub     96   inline G4double ScreenFunction2(const G4double delta);
 98                                                    97 
 99   inline void ScreenFunction12(const G4double      98   inline void ScreenFunction12(const G4double delta, G4double &f1, G4double &f2);
100                                                    99 
101   void     InitialiseElementData();               100   void     InitialiseElementData();
102                                                   101  
103   struct ElementData {                            102   struct ElementData {
104     G4double fDeltaMaxLow;                        103     G4double fDeltaMaxLow;
105     G4double fDeltaMaxHigh;                       104     G4double fDeltaMaxHigh;
106   };                                              105   };
107                                                   106   
108   static const G4int                gMaxZet;      107   static const G4int                gMaxZet; 
109                                                   108   
110   G4Pow*                            fG4Calc;      109   G4Pow*                            fG4Calc;
111   const G4ParticleDefinition*       fTheGamma;    110   const G4ParticleDefinition*       fTheGamma;
112   const G4ParticleDefinition*       fTheElectr    111   const G4ParticleDefinition*       fTheElectron;
113   const G4ParticleDefinition*       fThePositr    112   const G4ParticleDefinition*       fThePositron;
114   G4ParticleChangeForGamma*         fParticleC    113   G4ParticleChangeForGamma*         fParticleChange;
115   G4EmElementXS*                    fXSection{ << 
116                                                << 
117   G4bool isFirstInstance{false};               << 
118   G4bool useEPICS2017{false};                  << 
119                                                   114 
120   static std::vector<ElementData*>  gElementDa    115   static std::vector<ElementData*>  gElementData;
121 };                                                116 };
122                                                   117 
123 //                                                118 //
124 // Bethe screening functions for the elastic (    119 // Bethe screening functions for the elastic (coherent) scattering:
125 // Bethe's phi1, phi2 coherent screening funct    120 // Bethe's phi1, phi2 coherent screening functions were computed numerically 
126 // by using (the universal) atomic form factor    121 // by using (the universal) atomic form factors computed based on the Thomas-
127 // Fermi model of the atom (using numerical so    122 // Fermi model of the atom (using numerical solution of the Thomas-Fermi 
128 // screening function instead of Moliere's ana    123 // screening function instead of Moliere's analytical approximation). The 
129 // numerical results can be well approximated     124 // numerical results can be well approximated (better than Butcher & Messel 
130 // especially near the delta=1 limit) by:         125 // especially near the delta=1 limit) by:
131 // ## if delta <= 1.4                             126 // ## if delta <= 1.4 
132 //  phi1(delta) = 20.806 - delta*(3.190 - 0.57    127 //  phi1(delta) = 20.806 - delta*(3.190 - 0.5710*delta)   
133 //  phi2(delta) = 20.234 - delta*(2.126 - 0.09    128 //  phi2(delta) = 20.234 - delta*(2.126 - 0.0903*delta)
134 // ## if delta  > 1.4                             129 // ## if delta  > 1.4
135 //  phi1(delta) = phi2(delta) = 21.0190 - 4.14    130 //  phi1(delta) = phi2(delta) = 21.0190 - 4.145*ln(delta + 0.958)
136 // with delta = 136mc^2kZ^{-1/3}/[E(Eg-E)] = 1    131 // with delta = 136mc^2kZ^{-1/3}/[E(Eg-E)] = 136Z^{-1/3}eps0/[eps(1-eps)] where 
137 // Eg is the initial photon energy, E is the t    132 // Eg is the initial photon energy, E is the total energy transferred to one of 
138 // the e-/e+ pair, eps0 = mc^2/Eg and eps = E/    133 // the e-/e+ pair, eps0 = mc^2/Eg and eps = E/Eg.
139                                                   134 
140 // Compute the value of the screening function    135 // Compute the value of the screening function 3*PHI1(delta) - PHI2(delta):
141 inline G4double G4BetheHeitlerModel::ScreenFun    136 inline G4double G4BetheHeitlerModel::ScreenFunction1(const G4double delta)
142 {                                                 137 {
143   return (delta > 1.4) ? 42.038 - 8.29*G4Log(d    138   return (delta > 1.4) ? 42.038 - 8.29*G4Log(delta + 0.958) 
144                        : 42.184 - delta*(7.444    139                        : 42.184 - delta*(7.444 - 1.623*delta);
145 }                                                 140 }
146                                                   141 
147 // Compute the value of the screening function    142 // Compute the value of the screening function 1.5*PHI1(delta) +0.5*PHI2(delta):
148 inline G4double G4BetheHeitlerModel::ScreenFun    143 inline G4double G4BetheHeitlerModel::ScreenFunction2(const G4double delta)
149 {                                                 144 {
150   return (delta > 1.4) ? 42.038 - 8.29*G4Log(d    145   return (delta > 1.4) ? 42.038 - 8.29*G4Log(delta + 0.958)
151                        : 41.326 - delta*(5.848    146                        : 41.326 - delta*(5.848 - 0.902*delta);
152 }                                                 147 }
153                                                   148 
154 // Same as ScreenFunction1 and ScreenFunction2    149 // Same as ScreenFunction1 and ScreenFunction2 but computes them at once
155 inline void G4BetheHeitlerModel::ScreenFunctio    150 inline void G4BetheHeitlerModel::ScreenFunction12(const G4double delta, 
156                                                   151                                                   G4double &f1, G4double &f2)
157 {                                                 152 {
158   if (delta > 1.4) {                              153   if (delta > 1.4) {
159     f1 = 42.038 - 8.29*G4Log(delta + 0.958);      154     f1 = 42.038 - 8.29*G4Log(delta + 0.958);
160     f2 = f1;                                      155     f2 = f1;
161   } else {                                        156   } else {
162     f1 = 42.184 - delta*(7.444 - 1.623*delta);    157     f1 = 42.184 - delta*(7.444 - 1.623*delta);
163     f2 = 41.326 - delta*(5.848 - 0.902*delta);    158     f2 = 41.326 - delta*(5.848 - 0.902*delta); 
164   }                                               159   }
165 }                                                 160 }
166                                                   161 
167 #endif                                            162 #endif
168                                                   163