Gabriele Cosmo
84 lines
2.7 KiB
Plaintext
84 lines
2.7 KiB
Plaintext
// This code implementation is the intellectual property of
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// the RD44 GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4LowEnergyIonisation.icc,v 1.6 1999/07/06 13:21:19 aforti Exp $
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// GEANT4 tag $Name: geant4-00-01 $
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//
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//
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// ---------------------------------------------------------------
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// GEANT 4 class inlined methods file
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//
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// For information related to this code contact:
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// CERN, IT Division, ASD group
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// ------------ G4LowEnergyIonisation physics process ------------
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// by Laszlo Urban, 20 March 1997
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// ***************************************************************
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// It is the first implementation of the NEW IONISATION PROCESS.
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// It calculates the ionisation of e+/e-.
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// ***************************************************************
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//
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// 24-11-97: correction on MeanFreePath for KinEnergy > HighestLimit
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//
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// ---------------------------------------------------------------
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4bool G4LowEnergyIonisation::IsApplicable(
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const G4ParticleDefinition& particle)
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{
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return( (&particle == G4Electron::Electron())
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||(&particle == G4Positron::Positron()) );
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4LowEnergyIonisation::GetMeanFreePath(
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const G4Track& track,
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G4double,
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G4ForceCondition*){
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const G4DynamicParticle* aParticle = track.GetDynamicParticle();
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G4double KineticEnergy = aParticle->GetKineticEnergy();
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const G4Material* aMaterial = track.GetMaterial();
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G4bool isOutRange ;
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if( KineticEnergy < LowestKineticEnergy )
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MeanFreePath = DBL_MIN;
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else {
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if (KineticEnergy > HighestKineticEnergy) KineticEnergy = HighestKineticEnergy;
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const
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G4ElementVector* theElementVector = aMaterial->GetElementVector();
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const
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G4double* theAtomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
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const
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G4int NumberOfElements = aMaterial->GetNumberOfElements() ;
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G4double SIGMA = 0;
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for(G4int iel=0; iel<NumberOfElements; iel++ ){
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G4double Cs = ComputeCrossSection((*theElementVector)(iel)->GetZ(), KineticEnergy)*barn;
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SIGMA += theAtomicNumDensityVector[iel]*Cs;
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}
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// mean free path = 1./macroscopic cross section
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MeanFreePath = SIGMA > DBL_MIN ? 1./SIGMA : DBL_MAX;
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}
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return MeanFreePath ;
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}
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