Gabriele Cosmo
99 lines
4.2 KiB
Plaintext
99 lines
4.2 KiB
Plaintext
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4GammaConversionToMuons.icc,v 1.1 2002/04/19 14:44:33 hbu Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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// ------------ G4GammaConversionToMuons physics process ------
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// by H.Burkhardt, S. Kelner and R. Kokoulin, April 2002
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// -----------------------------------------------------------------------------
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4bool G4GammaConversionToMuons::IsApplicable(
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const G4ParticleDefinition& particle)
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{
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return ( &particle == G4Gamma::Gamma() );
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversionToMuons::GetCrossSectionPerAtom(
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const G4DynamicParticle* aDynamicGamma,
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G4Element* anElement)
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// gives the total cross section per atom in GEANT4 internal units
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{
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G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
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G4double AtomicZ = anElement->GetZ();
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G4double AtomicA = anElement->GetA()/(g/mole);
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G4double crossSection =
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ComputeCrossSectionPerAtom(GammaEnergy,AtomicZ,AtomicA);
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return crossSection;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversionToMuons::GetMeanFreePath(const G4Track& aTrack,
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G4double, G4ForceCondition*)
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// returns the photon mean free path in GEANT4 internal units
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// (MeanFreePath is a private member of the class)
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{
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const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
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G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
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G4Material* aMaterial = aTrack.GetMaterial();
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if (GammaEnergy < LowestEnergyLimit)
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MeanFreePath = DBL_MAX;
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else
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MeanFreePath = ComputeMeanFreePath(GammaEnergy,aMaterial);
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return MeanFreePath;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversionToMuons::ComputeMeanFreePath(
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G4double GammaEnergy, G4Material* aMaterial)
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// computes and returns the photon mean free path in GEANT4 internal units
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{
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const G4ElementVector* theElementVector = aMaterial->GetElementVector();
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const G4double* NbOfAtomsPerVolume = aMaterial->GetVecNbOfAtomsPerVolume();
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G4double SIGMA = 0 ;
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for ( size_t i=0 ; i < aMaterial->GetNumberOfElements() ; i++ )
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{
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G4double AtomicZ = (*theElementVector)[i]->GetZ();
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G4double AtomicA = (*theElementVector)[i]->GetA()/(g/mole);
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SIGMA += NbOfAtomsPerVolume[i] *
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ComputeCrossSectionPerAtom(GammaEnergy,AtomicZ,AtomicA);
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}
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return SIGMA > DBL_MIN ? 1./SIGMA : DBL_MAX;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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