Import Geant4 10.0.0 source tree
This commit is contained in:
Gabriele Cosmo
@@ -23,7 +23,7 @@
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id$
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// $Id: G4PairProductionRelModel.cc 74581 2013-10-15 12:03:25Z gcosmo $
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//
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// -------------------------------------------------------------------
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//
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@@ -58,21 +58,22 @@
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#include "G4Gamma.hh"
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#include "G4Electron.hh"
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#include "G4Positron.hh"
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#include "G4Log.hh"
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#include "G4ParticleChangeForGamma.hh"
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#include "G4LossTableManager.hh"
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#include "G4Exp.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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const G4double G4PairProductionRelModel::facFel = log(184.15);
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const G4double G4PairProductionRelModel::facFinel = log(1194.); // 1440.
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const G4double G4PairProductionRelModel::facFel = G4Log(184.15);
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const G4double G4PairProductionRelModel::facFinel = G4Log(1194.); // 1440.
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const G4double G4PairProductionRelModel::preS1 = 1./(184.15*184.15);
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const G4double G4PairProductionRelModel::logTwo = log(2.);
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const G4double G4PairProductionRelModel::logTwo = G4Log(2.);
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const G4double G4PairProductionRelModel::xgi[]={ 0.0199, 0.1017, 0.2372, 0.4083,
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0.5917, 0.7628, 0.8983, 0.9801 };
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@@ -81,6 +82,9 @@ const G4double G4PairProductionRelModel::wgi[]={ 0.0506, 0.1112, 0.1569, 0.1813,
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const G4double G4PairProductionRelModel::Fel_light[] = {0., 5.31 , 4.79 , 4.74 , 4.71};
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const G4double G4PairProductionRelModel::Finel_light[] = {0., 6.144 , 5.621 , 5.805 , 5.924};
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static const G4double xsfactor =
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4*fine_structure_const*classic_electr_radius*classic_electr_radius;
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static const G4double Egsmall=2.*MeV;
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G4PairProductionRelModel::G4PairProductionRelModel(const G4ParticleDefinition*,
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@@ -113,7 +117,15 @@ void G4PairProductionRelModel::Initialise(const G4ParticleDefinition* p,
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const G4DataVector& cuts)
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{
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if(!fParticleChange) { fParticleChange = GetParticleChangeForGamma(); }
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InitialiseElementSelectors(p, cuts);
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if(IsMaster()) { InitialiseElementSelectors(p, cuts); }
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4PairProductionRelModel::InitialiseLocal(const G4ParticleDefinition*,
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G4VEmModel* masterModel)
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{
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SetElementSelectors(masterModel->GetElementSelectors());
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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@@ -234,7 +246,7 @@ G4PairProductionRelModel::CalcLPMFunctions(G4double k, G4double eplusEnergy)
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if (sprime>1)
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xiLPM = 1.;
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else if (sprime>sqrt(2.)*s1) {
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G4double h = log(sprime)/logTS1;
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G4double h = G4Log(sprime)/logTS1;
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xiLPM = 1+h-0.08*(1-h)*(1-sqr(1-h))/logTS1;
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}
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@@ -257,11 +269,11 @@ G4PairProductionRelModel::CalcLPMFunctions(G4double k, G4double eplusEnergy)
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else if (s0<1.9516) {
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// intermediate suppression
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// using eq.77 approxim. valid s0<2.
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phiLPM = 1.-exp(-6.*s0*(1.+(3.-pi)*s0)
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phiLPM = 1.-G4Exp(-6.*s0*(1.+(3.-pi)*s0)
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+s3/(0.623+0.795*s0+0.658*s2));
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if (s0<0.415827397755) {
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// using eq.77 approxim. valid 0.07<s<2
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G4double psiLPM = 1-exp(-4*s0-8*s2/(1+3.936*s0+4.97*s2-0.05*s3+7.50*s4));
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G4double psiLPM = 1-G4Exp(-4*s0-8*s2/(1+3.936*s0+4.97*s2-0.05*s3+7.50*s4));
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gLPM = 3*psiLPM-2*phiLPM;
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}
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else {
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@@ -290,9 +302,8 @@ G4PairProductionRelModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*
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G4double gammaEnergy, G4double Z,
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G4double, G4double, G4double)
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{
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// static const G4double gammaEnergyLimit = 1.5*MeV;
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G4double crossSection = 0.0 ;
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if ( Z < 0.9 ) return crossSection;
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// if ( Z < 0.9 ) return crossSection;
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if ( gammaEnergy <= 2.0*electron_mass_c2 ) return crossSection;
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SetCurrentElement(Z);
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@@ -301,7 +312,7 @@ G4PairProductionRelModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*
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crossSection=ComputeXSectionPerAtom(gammaEnergy,Z);
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G4double xi = Finel/(Fel - fCoulomb); // inelastic contribution
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crossSection*=4.*Z*(Z+xi)*fine_structure_const*classic_electr_radius*classic_electr_radius;
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crossSection *= xsfactor*Z*(Z+xi);
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return crossSection;
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}
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@@ -337,10 +348,11 @@ G4PairProductionRelModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fve
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if(epsil0 > 1.0) { return; }
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// do it fast if GammaEnergy < 2. MeV
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static const G4double Egsmall=2.*MeV;
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SetupForMaterial(theGamma, aMaterial, GammaEnergy);
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// select randomly one element constituing the material
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const G4Element* anElement = SelectRandomAtom(aMaterial, theGamma, GammaEnergy);
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const G4Element* anElement =
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SelectRandomAtom(aMaterial, theGamma, GammaEnergy);
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if (GammaEnergy < Egsmall) {
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@@ -351,11 +363,11 @@ G4PairProductionRelModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fve
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// Extract Coulomb factor for this Element
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G4double FZ = 8.*(anElement->GetIonisation()->GetlogZ3());
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if (GammaEnergy > 50.*MeV) FZ += 8.*(anElement->GetfCoulomb());
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if (GammaEnergy > 50.*MeV) { FZ += 8.*(anElement->GetfCoulomb()); }
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// limits of the screening variable
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G4double screenfac = 136.*epsil0/(anElement->GetIonisation()->GetZ3());
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G4double screenmax = exp ((42.24 - FZ)/8.368) - 0.952 ;
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G4double screenmax = G4Exp ((42.24 - FZ)/8.368) - 0.952 ;
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G4double screenmin = min(4.*screenfac,screenmax);
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// limits of the energy sampling
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@@ -375,11 +387,12 @@ G4PairProductionRelModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fve
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do {
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if ( NormF1/(NormF1+NormF2) > G4UniformRand() ) {
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epsil = 0.5 - epsilrange*pow(G4UniformRand(), 0.333333);
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epsil = 0.5 - epsilrange*nist->GetZ13(G4UniformRand());
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screenvar = screenfac/(epsil*(1-epsil));
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if (fLPMflag && GammaEnergy>100.*GeV) {
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CalcLPMFunctions(GammaEnergy,GammaEnergy*epsil);
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greject = xiLPM*((gLPM+2.*phiLPM)*Phi1(screenvar) - gLPM*Phi2(screenvar) - phiLPM*FZ)/F10;
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greject = xiLPM*((gLPM+2.*phiLPM)*Phi1(screenvar) -
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gLPM*Phi2(screenvar) - phiLPM*FZ)/F10;
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}
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else {
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greject = (ScreenFunction1(screenvar) - FZ)/F10;
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@@ -390,7 +403,8 @@ G4PairProductionRelModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fve
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screenvar = screenfac/(epsil*(1-epsil));
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if (fLPMflag && GammaEnergy>100.*GeV) {
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CalcLPMFunctions(GammaEnergy,GammaEnergy*epsil);
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greject = xiLPM*((0.5*gLPM+phiLPM)*Phi1(screenvar) + 0.5*gLPM*Phi2(screenvar) - 0.5*(gLPM+phiLPM)*FZ)/F20;
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greject = xiLPM*((0.5*gLPM+phiLPM)*Phi1(screenvar) +
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0.5*gLPM*Phi2(screenvar) - 0.5*(gLPM+phiLPM)*FZ)/F20;
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}
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else {
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greject = (ScreenFunction2(screenvar) - FZ)/F20;
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@@ -425,10 +439,12 @@ G4PairProductionRelModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fve
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// derived from Tsai distribution (Rev Mod Phys 49,421(1977))
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G4double u;
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const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ;
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static const G4double a1 = 0.625;
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static const G4double a2 = 3.*a1;
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static const G4double d = 27. ;
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if (9./(9.+d) >G4UniformRand()) u= - log(G4UniformRand()*G4UniformRand())/a1;
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else u= - log(G4UniformRand()*G4UniformRand())/a2;
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if (9./(9.+d) >G4UniformRand()) u= - G4Log(G4UniformRand()*G4UniformRand())/a1;
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else u= - G4Log(G4UniformRand()*G4UniformRand())/a2;
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G4double TetEl = u*electron_mass_c2/ElectTotEnergy;
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G4double TetPo = u*electron_mass_c2/PositTotEnergy;
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