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Geant4/processes/cuts/src/G4RToEConvForGamma.cc

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Differences between /processes/cuts/src/G4RToEConvForGamma.cc (Version 11.3.0) and /processes/cuts/src/G4RToEConvForGamma.cc (Version 8.1.p1)


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 25 //                                                 25 //
 26 // G4RToEConvForGamma class implementation     << 
 27 //                                                 26 //
 28 // Author: H.Kurashige, 05 October 2002 - Firs <<  27 // $Id: G4RToEConvForGamma.cc,v 1.4 2006/06/29 19:30:24 gunter Exp $
 29 // ------------------------------------------- <<  28 // GEANT4 tag $Name: geant4-08-01-patch-01 $
                                                   >>  29 //
                                                   >>  30 //
                                                   >>  31 // --------------------------------------------------------------
                                                   >>  32 //      GEANT 4 class implementation file/  History:
                                                   >>  33 //    5 Oct. 2002, H.Kuirashige : Structure created based on object model
                                                   >>  34 // --------------------------------------------------------------
 30                                                    35 
 31 #include "G4RToEConvForGamma.hh"                   36 #include "G4RToEConvForGamma.hh"
 32 #include "G4ParticleDefinition.hh"                 37 #include "G4ParticleDefinition.hh"
 33 #include "G4ParticleTable.hh"                      38 #include "G4ParticleTable.hh"
 34 #include "G4SystemOfUnits.hh"                  <<  39 #include "G4Material.hh"
 35 #include "G4Log.hh"                            <<  40 #include "G4PhysicsLogVector.hh"
 36 #include "G4Exp.hh"                            <<  41 
 37 #include "G4Pow.hh"                            <<  42 #include "G4ios.hh"
 38                                                <<  43 
 39 // ------------------------------------------- <<  44 G4RToEConvForGamma::G4RToEConvForGamma() : G4VRangeToEnergyConverter()
 40 G4RToEConvForGamma::G4RToEConvForGamma()       << 
 41   : G4VRangeToEnergyConverter()                << 
 42 {                                                  45 {    
 43   theParticle = G4ParticleTable::GetParticleTa <<  46   theParticle =  G4ParticleTable::GetParticleTable()->FindParticle("gamma");
 44   if (theParticle == nullptr)                  <<  47   if (theParticle ==0) {
 45   {                                            << 
 46 #ifdef G4VERBOSE                                   48 #ifdef G4VERBOSE
 47     if (GetVerboseLevel()>0)                   <<  49     if (GetVerboseLevel()>0) {
 48     {                                          <<  50       G4cout << " G4RToEConvForGamma::G4RToEConvForGamma() ";
 49       G4cout << " G4RToEConvForGamma::G4RToECo <<  51       G4cout << " Gamma is not defined !!" << G4endl;
 50       G4cout << "Gamma is not defined !!" << G << 
 51     }                                              52     }
 52 #endif                                             53 #endif
 53   }                                                54   } 
 54   else                                         <<  55   TotBin = 100;
 55   {                                            << 
 56     fPDG = theParticle->GetPDGEncoding();      << 
 57   }                                            << 
 58 }                                                  56 }
 59                                                    57 
 60 // ------------------------------------------- <<  58 G4RToEConvForGamma::~G4RToEConvForGamma()
 61 G4RToEConvForGamma::~G4RToEConvForGamma()      <<  59 { 
 62 {}                                             <<  60 }
 63                                                <<  61 
 64 // ------------------------------------------- <<  62 
 65 G4double G4RToEConvForGamma::ComputeValue(cons <<  63 // ***********************************************************************
 66                                           cons <<  64 // ******************* BuildAbsorptionLengthVector ***********************
                                                   >>  65 // ***********************************************************************
                                                   >>  66 void G4RToEConvForGamma::BuildAbsorptionLengthVector(
                                                   >>  67                             const G4Material* aMaterial,
                                                   >>  68                             G4double       ,     
                                                   >>  69                             G4double       ,
                                                   >>  70                             G4RangeVector* absorptionLengthVector )
 67 {                                                  71 {
 68   // Compute the "absorption" cross-section of <<  72   // fill the absorption length vector for this material
 69   // Cross-section means here the sum of the c <<  73   // absorption length is defined here as
 70   // pair production, Compton scattering and p <<  74   //
 71                                                <<  75   //    absorption length = 5./ macroscopic absorption cross section
 72   const G4double t1keV = 1.*CLHEP::keV;        <<  76   //
 73   const G4double t200keV = 200.*CLHEP::keV;    <<  77   const G4CrossSectionTable* aCrossSectionTable = (G4CrossSectionTable*)(theLossTable);
 74   const G4double t100MeV = 100.*CLHEP::MeV;    <<  78   const G4ElementVector* elementVector = aMaterial->GetElementVector();
 75                                                <<  79   const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
 76   G4double Zsquare = Z*Z;                      <<  80 
 77   G4double Zlog = G4Pow::GetInstance()->logZ(Z <<  81   //  fill absorption length vector
 78   G4double Zlogsquare = Zlog*Zlog;             <<  82   G4int NumEl = aMaterial->GetNumberOfElements();
 79                                                <<  83   G4double absorptionLengthMax = 0.0;
 80   G4double tmin = (0.552+218.5/Z+557.17/Zsquar <<  84   for (size_t ibin=0; ibin<size_t(TotBin); ibin++) {
 81   G4double tlow = 0.2*G4Exp(-7.355/std::sqrt(Z <<  85     G4double lowEdgeEnergy = absorptionLengthVector->GetLowEdgeEnergy(ibin);
 82                                                <<  86     
 83   G4double smin = (0.01239+0.005585*Zlog-0.000 <<  87     G4double SIGMA = 0. ;
 84   G4double s200keV = (0.2651-0.1501*Zlog+0.022 <<  88     
 85                                                <<  89     for (size_t iel=0; iel<size_t(NumEl); iel++) {
 86   G4double cminlog = G4Log(tmin/t200keV);      <<  90       G4bool isOut;
 87   G4double cmin = G4Log(s200keV/smin)/(cminlog <<  91       G4int IndEl = (*elementVector)[iel]->GetIndex();
 88                                                <<  92       SIGMA +=  atomicNumDensityVector[iel]*
 89   G4double slowlog = G4Log(t200keV/tlow);      <<  93              (*aCrossSectionTable)[IndEl]->GetValue(lowEdgeEnergy,isOut);
 90   G4double slow = s200keV * G4Exp(0.042*Z*slow <<  94     }
 91   G4double logtlow = G4Log(tlow/t1keV);        <<  95     //  absorption length=5./SIGMA
 92   G4double clow = G4Log(300.*Zsquare/slow)/log <<  96     absorptionLengthVector->PutValue(ibin, 5./SIGMA);
 93   G4double chigh = (7.55e-5 - 0.0542e-5*Z)*Zsq <<  97     if (absorptionLengthMax < 5./SIGMA ) absorptionLengthMax = 5./SIGMA;
 94                                                << 
 95   // Calculate the cross-section (using an app << 
 96   G4double xs;                                 << 
 97   if ( energy < tlow )                         << 
 98   {                                            << 
 99     xs = (energy < t1keV) ? slow*G4Exp(clow*lo << 
100       slow*G4Exp(clow*G4Log(tlow/energy));     << 
101   }                                            << 
102   else if ( energy < t200keV )                 << 
103   {                                            << 
104     G4double x = G4Log(t200keV/energy);        << 
105     xs = s200keV * G4Exp(0.042*Z*x*x);         << 
106   }                                                98   }
107   else if( energy<tmin )                       <<  99 }
108   {                                            << 100 
109     const G4double x = G4Log(tmin/energy);     << 101 
110     xs = smin * G4Exp(cmin*x*x);               << 102 
                                                   >> 103 // ***********************************************************************
                                                   >> 104 // ********************** ComputeCrossSection ****************************
                                                   >> 105 // ***********************************************************************
                                                   >> 106 G4double G4RToEConvForGamma::ComputeCrossSection(G4double AtomicNumber,
                                                   >> 107              G4double KineticEnergy) const
                                                   >> 108 {
                                                   >> 109   //  Compute the "absorption" cross section of the photon "absorption"
                                                   >> 110   //  cross section means here the sum of the cross sections of the
                                                   >> 111   //  pair production, Compton scattering and photoelectric processes
                                                   >> 112   static G4double Z;  
                                                   >> 113   const  G4double t1keV = 1.*keV;
                                                   >> 114   const  G4double t200keV = 200.*keV;
                                                   >> 115   const  G4double t100MeV = 100.*MeV;
                                                   >> 116 
                                                   >> 117   static G4double s200keV, s1keV;
                                                   >> 118   static G4double tmin, tlow; 
                                                   >> 119   static G4double smin, slow;
                                                   >> 120   static G4double cmin, clow, chigh;
                                                   >> 121   //  compute Z dependent quantities in the case of a new AtomicNumber
                                                   >> 122   if(std::abs(AtomicNumber-Z)>0.1)  {
                                                   >> 123     Z = AtomicNumber;
                                                   >> 124     G4double Zsquare = Z*Z;
                                                   >> 125     G4double Zlog = std::log(Z);
                                                   >> 126     G4double Zlogsquare = Zlog*Zlog;
                                                   >> 127 
                                                   >> 128     s200keV = (0.2651-0.1501*Zlog+0.02283*Zlogsquare)*Zsquare;
                                                   >> 129     tmin = (0.552+218.5/Z+557.17/Zsquare)*MeV;
                                                   >> 130     smin = (0.01239+0.005585*Zlog-0.000923*Zlogsquare)*std::exp(1.5*Zlog);
                                                   >> 131     cmin=std::log(s200keV/smin)/(std::log(tmin/t200keV)*std::log(tmin/t200keV));
                                                   >> 132     tlow = 0.2*std::exp(-7.355/std::sqrt(Z))*MeV;
                                                   >> 133     slow = s200keV*std::exp(0.042*Z*std::log(t200keV/tlow)*std::log(t200keV/tlow));
                                                   >> 134     s1keV = 300.*Zsquare;
                                                   >> 135     clow =std::log(s1keV/slow)/std::log(tlow/t1keV);
                                                   >> 136 
                                                   >> 137     chigh=(7.55e-5-0.0542e-5*Z)*Zsquare*Z/std::log(t100MeV/tmin);
111   }                                               138   }
112   else                                         << 139 
113   {                                            << 140   //  calculate the cross section (using an approximate empirical formula)
114     xs = smin + chigh*G4Log(energy/tmin);      << 141   G4double s;
                                                   >> 142   if ( KineticEnergy<tlow ) {
                                                   >> 143     if(KineticEnergy<t1keV) s = slow*std::exp(clow*std::log(tlow/t1keV));
                                                   >> 144     else                    s = slow*std::exp(clow*std::log(tlow/KineticEnergy));
                                                   >> 145 
                                                   >> 146   } else if ( KineticEnergy<t200keV ) {
                                                   >> 147     s = s200keV
                                                   >> 148          * std::exp(0.042*Z*std::log(t200keV/KineticEnergy)*std::log(t200keV/KineticEnergy));
                                                   >> 149 
                                                   >> 150   } else if( KineticEnergy<tmin ){
                                                   >> 151     s = smin
                                                   >> 152          * std::exp(cmin*std::log(tmin/KineticEnergy)*std::log(tmin/KineticEnergy));
                                                   >> 153 
                                                   >> 154   } else {
                                                   >> 155     s = smin + chigh*std::log(KineticEnergy/tmin);
                                                   >> 156 
115   }                                               157   }
116   return xs * CLHEP::barn;                     << 158   return s * barn;
117 }                                                 159 }
118                                                   160 
119 // ------------------------------------------- << 
120                                                   161