Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/standard/src/G4DeltaAngleFreeScat.cc

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 25 //
 26 //
 27 // -------------------------------------------------------------------
 28 //
 29 // GEANT4 Class file
 30 //
 31 //
 32 // File name:     G4DeltaAngleFreeScat
 33 //
 34 // Author:        Vladimir Ivantcheko
 35 // 
 36 // Creation date: 23 August 2013
 37 //
 38 // Modifications: 
 39 //
 40 // Class Description: 
 41 //
 42 // Delta-electron Angular Distribution Generation 
 43 //
 44 // Class Description: End 
 45 //
 46 // -------------------------------------------------------------------
 47 //
 48 
 49 #include "G4DeltaAngleFreeScat.hh"
 50 #include "G4PhysicalConstants.hh"
 51 #include "Randomize.hh"
 52 
 53 using namespace std;
 54 
 55 G4DeltaAngleFreeScat::G4DeltaAngleFreeScat(const G4String&)
 56   : G4VEmAngularDistribution("deltaFree")
 57 {}    
 58 
 59 G4DeltaAngleFreeScat::~G4DeltaAngleFreeScat() = default;
 60 
 61 G4ThreeVector& 
 62 G4DeltaAngleFreeScat::SampleDirection(const G4DynamicParticle* dp,
 63             G4double kinEnergyFinal, G4int, 
 64             const G4Material*)
 65 {
 66   G4double deltaMomentum = 
 67     sqrt(kinEnergyFinal*(kinEnergyFinal + 2*electron_mass_c2));
 68 
 69   G4double costet = kinEnergyFinal*(dp->GetTotalEnergy() + electron_mass_c2) /
 70     (deltaMomentum * dp->GetTotalMomentum());
 71 
 72   G4double phi = G4UniformRand()*twopi;
 73   G4double sintet = sqrt((1 - costet)*(1 + costet));
 74  
 75   fLocalDirection.set(sintet*cos(phi), sintet*sin(phi), costet);
 76   fLocalDirection.rotateUz(dp->GetMomentumDirection());
 77 
 78   return fLocalDirection;
 79 }
 80 
 81 void G4DeltaAngleFreeScat::PrintGeneratorInformation() const
 82 {} 
 83