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25 // 25 //
>> 26 // $Id: G4GammaConversion.cc,v 1.27 2006/09/14 10:27:19 maire Exp $
>> 27 // GEANT4 tag $Name: geant4-08-03-patch-02 $
26 // 28 //
27 // 29 //
28 //------------------ G4GammaConversion physics 30 //------------------ G4GammaConversion physics process -------------------------
29 // by Michel Maire, 24 May 1 31 // by Michel Maire, 24 May 1996
30 // 32 //
31 // Modified by Michel Maire and Vladimir Ivanc << 33 // 11-06-96 Added SelectRandomAtom() method, M.Maire
32 // << 34 // 21-06-96 SetCuts implementation, M.Maire
>> 35 // 24-06-96 simplification in ComputeCrossSectionPerAtom, M.Maire
>> 36 // 24-06-96 in DoIt : change the particleType stuff, M.Maire
>> 37 // 25-06-96 modification in the generation of the teta angle, M.Maire
>> 38 // 16-09-96 minors optimisations in DoIt. Thanks to P.Urban
>> 39 // dynamical array PartialSumSigma
>> 40 // 13-12-96 fast sampling of epsil below 2 MeV, L.Urban
>> 41 // 14-01-97 crossection table + meanfreepath table.
>> 42 // PartialSumSigma removed, M.Maire
>> 43 // 14-01-97 in DoIt the positron is always created, even with Ekine=0,
>> 44 // for further annihilation, M.Maire
>> 45 // 14-03-97 new Physics scheme for geant4alpha, M.Maire
>> 46 // 28-03-97 protection in BuildPhysicsTable, M.Maire
>> 47 // 19-06-97 correction in ComputeCrossSectionPerAtom, L.Urban
>> 48 // 04-06-98 in DoIt, secondary production condition:
>> 49 // range>std::min(threshold,safety)
>> 50 // 13-08-98 new methods SetBining() PrintInfo()
>> 51 // 28-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
>> 52 // 11-07-01 PostStepDoIt - sampling epsil: power(rndm,0.333333)
>> 53 // 13-07-01 DoIt: suppression of production cut for the (e-,e+) (mma)
>> 54 // 06-08-01 new methods Store/Retrieve PhysicsTable (mma)
>> 55 // 06-08-01 BuildThePhysicsTable() called from constructor (mma)
>> 56 // 17-09-01 migration of Materials to pure STL (mma)
>> 57 // 20-09-01 DoIt: fminimalEnergy = 1*eV (mma)
>> 58 // 01-10-01 come back to BuildPhysicsTable(const G4ParticleDefinition&)
>> 59 // 11-01-02 ComputeCrossSection: correction of extrapolation below EnergyLimit
>> 60 // 21-03-02 DoIt: correction of the e+e- angular distribution (bug 363) mma
>> 61 // 08-11-04 Remove of Store/Retrieve tables (V.Ivantchenko)
>> 62 // 19-04-05 Migrate to model interface and inherit
>> 63 // from G4VEmProcess (V.Ivanchenko)
>> 64 // 04-05-05, Make class to be default (V.Ivanchenko)
>> 65 // 09-08-06, add SetModel(G4VEmModel*) (mma)
>> 66 // 12-09-06, move SetModel(G4VEmModel*) in G4VEmProcess (mma)
33 // ------------------------------------------- 67 // -----------------------------------------------------------------------------
34 68
35 #include "G4GammaConversion.hh" 69 #include "G4GammaConversion.hh"
36 #include "G4PhysicalConstants.hh" << 70 #include "G4BetheHeitlerModel.hh"
37 #include "G4SystemOfUnits.hh" <<
38 #include "G4PairProductionRelModel.hh" <<
39 #include "G4Electron.hh" 71 #include "G4Electron.hh"
40 #include "G4EmParameters.hh" <<
41 72
42 //....oooOO0OOooo........oooOO0OOooo........oo 73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
43 74
>> 75 using namespace std;
>> 76
44 G4GammaConversion::G4GammaConversion(const G4S 77 G4GammaConversion::G4GammaConversion(const G4String& processName,
45 G4ProcessType type):G4VEmProcess (processNam << 78 G4ProcessType type):G4VEmProcess (processName, type),
>> 79 isInitialised(false)
46 { 80 {
47 SetMinKinEnergy(2.0*CLHEP::electron_mass_c2) << 81 SetLambdaBinning(100);
48 SetProcessSubType(fGammaConversion); << 82 SetMinKinEnergy(2.0*electron_mass_c2);
49 SetStartFromNullFlag(true); << 83 SetMaxKinEnergy(100.0*GeV);
50 SetBuildTableFlag(true); <<
51 SetSecondaryParticle(G4Electron::Electron()) <<
52 SetLambdaBinning(220); <<
53 } 84 }
54 85
55 //....oooOO0OOooo........oooOO0OOooo........oo 86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56 87
57 G4GammaConversion::~G4GammaConversion() = defa << 88 G4GammaConversion::~G4GammaConversion()
58 << 89 {}
59 //....oooOO0OOooo........oooOO0OOooo........oo <<
60 <<
61 G4bool G4GammaConversion::IsApplicable(const G <<
62 { <<
63 return (&p == G4Gamma::Gamma()); <<
64 } <<
65 90
66 //....oooOO0OOooo........oooOO0OOooo........oo 91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
67 92
68 void G4GammaConversion::InitialiseProcess(cons 93 void G4GammaConversion::InitialiseProcess(const G4ParticleDefinition*)
69 { 94 {
70 if(!isInitialised) { 95 if(!isInitialised) {
71 isInitialised = true; 96 isInitialised = true;
72 G4EmParameters* param = G4EmParameters::In << 97 SetBuildTableFlag(true);
73 G4double emin = std::max(param->MinKinEner << 98 SetSecondaryParticle(G4Electron::Electron());
74 G4double emax = param->MaxKinEnergy(); << 99 G4double emin = max(MinKinEnergy(), 2.0*electron_mass_c2);
75 <<
76 SetMinKinEnergy(emin); 100 SetMinKinEnergy(emin);
77 << 101 G4double emax = MaxKinEnergy();
78 if(nullptr == EmModel(0)) { SetEmModel(new << 102 if(!Model()) SetModel(new G4BetheHeitlerModel);
79 EmModel(0)->SetLowEnergyLimit(emin); << 103 Model()->SetLowEnergyLimit(emin);
80 EmModel(0)->SetHighEnergyLimit(emax); << 104 Model()->SetHighEnergyLimit(emax);
81 AddEmModel(1, EmModel(0)); << 105 AddEmModel(1, Model());
82 } 106 }
83 } 107 }
84 108
85 //....oooOO0OOooo........oooOO0OOooo........oo <<
86 <<
87 G4double G4GammaConversion::MinPrimaryEnergy(c <<
88 const G4Material*) <<
89 { <<
90 return 2*CLHEP::electron_mass_c2; <<
91 } <<
92 <<
93 //....oooOO0OOooo........oooOO0OOooo........oo 109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 110
95 void G4GammaConversion::ProcessDescription(std << 111 void G4GammaConversion::PrintInfo()
96 { 112 {
97 out << " Gamma conversion"; << 113 G4cout
98 G4VEmProcess::ProcessDescription(out); << 114 << " Total cross sections has a good parametrisation"
99 } << 115 << " from 1.5 MeV to 100 GeV for all Z;"
>> 116 << "\n sampling secondary e+e- according "
>> 117 << Model()->GetName() << " model"
>> 118 << G4endl;
>> 119 }
100 120
101 //....oooOO0OOooo........oooOO0OOooo........oo << 121 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102 122