Gabriele Cosmo
99 lines
4.2 KiB
Plaintext
99 lines
4.2 KiB
Plaintext
//
|
|
// ********************************************************************
|
|
// * DISCLAIMER *
|
|
// * *
|
|
// * The following disclaimer summarizes all the specific disclaimers *
|
|
// * of contributors to this software. The specific disclaimers,which *
|
|
// * govern, are listed with their locations in: *
|
|
// * http://cern.ch/geant4/license *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. *
|
|
// * *
|
|
// * This code implementation is the intellectual property of the *
|
|
// * GEANT4 collaboration. *
|
|
// * By copying, distributing or modifying the Program (or any work *
|
|
// * based on the Program) you indicate your acceptance of this *
|
|
// * statement, and all its terms. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// $Id: G4GammaConversionToMuons.icc,v 1.1 2002/04/19 14:44:33 hbu Exp $
|
|
// GEANT4 tag $Name: geant4-05-02-patch-01 $
|
|
//
|
|
// ------------ G4GammaConversionToMuons physics process ------
|
|
// by H.Burkhardt, S. Kelner and R. Kokoulin, April 2002
|
|
// -----------------------------------------------------------------------------
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline G4bool G4GammaConversionToMuons::IsApplicable(
|
|
const G4ParticleDefinition& particle)
|
|
{
|
|
return ( &particle == G4Gamma::Gamma() );
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline G4double G4GammaConversionToMuons::GetCrossSectionPerAtom(
|
|
const G4DynamicParticle* aDynamicGamma,
|
|
G4Element* anElement)
|
|
|
|
// gives the total cross section per atom in GEANT4 internal units
|
|
{
|
|
G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
|
|
G4double AtomicZ = anElement->GetZ();
|
|
G4double AtomicA = anElement->GetA()/(g/mole);
|
|
G4double crossSection =
|
|
ComputeCrossSectionPerAtom(GammaEnergy,AtomicZ,AtomicA);
|
|
return crossSection;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline G4double G4GammaConversionToMuons::GetMeanFreePath(const G4Track& aTrack,
|
|
G4double, G4ForceCondition*)
|
|
|
|
// returns the photon mean free path in GEANT4 internal units
|
|
// (MeanFreePath is a private member of the class)
|
|
|
|
{
|
|
const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
|
|
G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
|
|
G4Material* aMaterial = aTrack.GetMaterial();
|
|
|
|
if (GammaEnergy < LowestEnergyLimit)
|
|
MeanFreePath = DBL_MAX;
|
|
else
|
|
MeanFreePath = ComputeMeanFreePath(GammaEnergy,aMaterial);
|
|
|
|
return MeanFreePath;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline G4double G4GammaConversionToMuons::ComputeMeanFreePath(
|
|
G4double GammaEnergy, G4Material* aMaterial)
|
|
|
|
// computes and returns the photon mean free path in GEANT4 internal units
|
|
{
|
|
const G4ElementVector* theElementVector = aMaterial->GetElementVector();
|
|
const G4double* NbOfAtomsPerVolume = aMaterial->GetVecNbOfAtomsPerVolume();
|
|
|
|
G4double SIGMA = 0 ;
|
|
|
|
for ( size_t i=0 ; i < aMaterial->GetNumberOfElements() ; i++ )
|
|
{
|
|
G4double AtomicZ = (*theElementVector)[i]->GetZ();
|
|
G4double AtomicA = (*theElementVector)[i]->GetA()/(g/mole);
|
|
SIGMA += NbOfAtomsPerVolume[i] *
|
|
ComputeCrossSectionPerAtom(GammaEnergy,AtomicZ,AtomicA);
|
|
}
|
|
return SIGMA > DBL_MIN ? 1./SIGMA : DBL_MAX;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|