| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| 28 | //
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| 29 | //
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| 30 | // GEANT4 physics class: G4ElectroNuclearCrossSection -- header file
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| 31 | // M.V. Kossov, ITEP(Moscow), 24-OCT-01
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| 32 | // The last update: M.V. Kossov, CERN/ITEP (Moscow) 25-Sept-03
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| 33 | //
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| 34 |
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| 35 | #ifndef G4ElectroNuclearCrossSection_h
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| 36 | #define G4ElectroNuclearCrossSection_h 1
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| 37 |
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| 38 | #include "G4VCrossSectionDataSet.hh"
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| 39 | #include "G4DynamicParticle.hh"
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| 40 | #include "G4Element.hh"
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| 41 | #include "G4ParticleTable.hh"
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| 42 | #include "G4NucleiProperties.hh"
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| 43 | #include <vector>
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| 44 | #include "Randomize.hh"
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| 45 | #include "G4Electron.hh"
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| 46 | #include "G4Positron.hh"
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| 47 |
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| 48 | class G4ElectroNuclearCrossSection : public G4VCrossSectionDataSet
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| 49 | {
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| 50 | public:
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| 51 |
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| 52 | G4ElectroNuclearCrossSection();
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| 53 | virtual ~G4ElectroNuclearCrossSection();
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| 54 |
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| 55 | G4bool IsApplicable(const G4DynamicParticle* aParticle, const G4Element* )
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| 56 | {
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| 57 | return IsZAApplicable(aParticle, 0., 0.);
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| 58 | }
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| 59 |
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| 60 | G4bool IsZAApplicable(const G4DynamicParticle* aParticle, G4double /*ZZ*/,
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| 61 | G4double /*AA*/)
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| 62 | {
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| 63 | G4bool result = false;
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| 64 | if( aParticle->GetDefinition()==G4Electron::ElectronDefinition()) result = true;
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| 65 | if( aParticle->GetDefinition()==G4Positron::PositronDefinition()) result = true;
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| 66 | return result;
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| 67 | }
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| 68 |
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| 69 |
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| 70 | G4double GetCrossSection(const G4DynamicParticle* aParticle,
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| 71 | const G4Element* anElement, G4double T=0.);
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| 72 |
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| 73 | G4double GetIsoZACrossSection(const G4DynamicParticle* aParticle,
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| 74 | G4double ZZ, G4double AA, G4double T=0.);
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| 75 |
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| 76 |
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| 77 | G4double GetEquivalentPhotonEnergy();
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| 78 |
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| 79 | G4double GetVirtualFactor(G4double nu, G4double Q2);
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| 80 |
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| 81 | G4double GetEquivalentPhotonQ2(G4double nu);
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| 82 |
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| 83 | void BuildPhysicsTable(const G4ParticleDefinition&) {}
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| 84 |
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| 85 | void DumpPhysicsTable(const G4ParticleDefinition&) {}
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| 86 |
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| 87 | private:
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| 88 | G4int GetFunctions(G4double a, G4double* x, G4double* y, G4double* z);
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| 89 | //G4double LinearFit(G4double X, G4int N, const G4double* XN, const G4double* YN);
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| 90 | G4double ThresholdEnergy(G4int Z, G4int N);
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| 91 | G4double HighEnergyJ1(G4double lE);
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| 92 | G4double HighEnergyJ2(G4double lE);
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| 93 | G4double HighEnergyJ3(G4double lE);
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| 94 | G4double SolveTheEquation(G4double f);
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| 95 | G4double Fun(G4double x);
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| 96 | G4double DFun(G4double x);
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| 97 |
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| 98 | // Body
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| 99 | private:
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| 100 | static G4int lastN; // The last N of calculated nucleus
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| 101 | static G4int lastZ; // The last Z of calculated nucleus
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| 102 | static G4int lastF; // Last used in the cross section TheFirstBin
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| 103 | static G4double* lastJ1; // Pointer to the last array of the J1 function
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| 104 | static G4double* lastJ2; // Pointer to the last array of the J2 function
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| 105 | static G4double* lastJ3; // Pointer to the last array of the J3 function
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| 106 | static G4int lastL; // Last used in the cross section TheLastBin
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| 107 | static G4double lastE; // Last used in the cross section Energy
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| 108 | static G4double lastTH; // Last value of the Energy Threshold
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| 109 | static G4double lastSig; // Last value of the Cross Section
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| 110 | static G4double lastG; // Last value of gamma=lnE-ln(me)
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| 111 | static G4double lastH; // Last value of the High energy A-dependence
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| 112 |
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| 113 | static std::vector <G4double*> J1; // Vector of pointers to the J1 tabulated functions
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| 114 | static std::vector <G4double*> J2; // Vector of pointers to the J2 tabulated functions
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| 115 | static std::vector <G4double*> J3; // Vector of pointers to the J3 tabulated functions
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| 116 | };
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| 117 |
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| 118 | inline G4double G4ElectroNuclearCrossSection::DFun(G4double x)// Parametrization of the PhotoNucCS
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| 119 | {
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| 120 | static const G4double shd=1.0734; // HE PomShadowing(D)
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| 121 | static const G4double poc=0.0375; // HE Pomeron coefficient
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| 122 | static const G4double pos=16.5; // HE Pomeron shift
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| 123 | static const G4double reg=.11; // HE Reggeon slope
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| 124 | static const G4double mel=0.5109989; // Mass of an electron in MeV
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| 125 | static const G4double lmel=std::log(mel); // Log of an electron mass
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| 126 | G4double y=std::exp(x-lastG-lmel); // y for the x
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| 127 | G4double flux=lastG*(2.-y*(2.-y))-1.; // flux factor
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| 128 | return (poc*(x-pos)+shd*std::exp(-reg*x))*flux;
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| 129 | }
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| 130 |
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| 131 | inline G4double G4ElectroNuclearCrossSection::Fun(G4double x) // Integrated PhoNuc cross section
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| 132 | {
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| 133 | G4double dlg1=lastG+lastG-1.;
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| 134 | G4double lgoe=lastG/lastE;
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| 135 | G4double HE2=HighEnergyJ2(x);
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| 136 | return dlg1*HighEnergyJ1(x)-lgoe*(HE2+HE2-HighEnergyJ3(x)/lastE);
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| 137 | }
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| 138 |
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| 139 | inline G4double G4ElectroNuclearCrossSection::HighEnergyJ1(G4double lEn)
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| 140 | {
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| 141 | static const G4double le=std::log(50000.); // std::log(E0)
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| 142 | static const G4double le2=le*le; // std::log(E0)^2
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| 143 | static const G4double a=.0375; // a
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| 144 | static const G4double ha=a*.5; // a/2
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| 145 | static const G4double ab=a*16.5; // a*b
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| 146 | static const G4double d=0.11; // d
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| 147 | static const G4double cd=1.0734/d; // c/d
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| 148 | static const G4double ele=std::exp(-d*le); // E0^(-d)
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| 149 | return ha*(lEn*lEn-le2)-ab*(lEn-le)-cd*(std::exp(-d*lEn)-ele);
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| 150 | }
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| 151 |
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| 152 | inline G4double G4ElectroNuclearCrossSection::HighEnergyJ2(G4double lEn)
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| 153 | {
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| 154 | static const G4double e=50000.; // E0
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| 155 | static const G4double le=std::log(e); // std::log(E0)
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| 156 | static const G4double le1=(le-1.)*e; // (std::log(E0)-1)*E0
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| 157 | static const G4double a=.0375; // a
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| 158 | static const G4double ab=a*16.5; // a*b
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| 159 | static const G4double d=1.-0.11; // 1-d
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| 160 | static const G4double cd=1.0734/d; // c/(1-d)
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| 161 | static const G4double ele=std::exp(d*le); // E0^(1-d)
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| 162 | G4double En=std::exp(lEn);
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| 163 | return a*((lEn-1.)*En-le1)-ab*(En-e)+cd*(std::exp(d*lEn)-ele);
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| 164 | }
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| 165 |
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| 166 | inline G4double G4ElectroNuclearCrossSection::HighEnergyJ3(G4double lEn)
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| 167 | {
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| 168 | static const G4double e=50000.; // E0
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| 169 | static const G4double le=std::log(e); // std::log(E0)
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| 170 | static const G4double e2=e*e; // E0^2
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| 171 | static const G4double leh=(le-.5)*e2; // (std::log(E0)-.5)*E0^2
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| 172 | static const G4double ha=.0375*.5; // a/2
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| 173 | static const G4double hab=ha*16.5; // a*b/2
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| 174 | static const G4double d=2.-.11; // 2-d
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| 175 | static const G4double cd=1.0734/d; // c/(2-d)
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| 176 | static const G4double ele=std::exp(d*le); // E0^(2-d)
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| 177 | G4double lastE2=std::exp(lEn+lEn);
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| 178 | return ha*((lEn-.5)*lastE2-leh)-hab*(lastE2-e2)+cd*(std::exp(d*lEn)-ele);
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| 179 | }
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| 180 |
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| 181 | #endif
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