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G4DeltaAngleFreeScat.cc
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26 // $Id: G4DeltaAngleFreeScat.cc 68380 2013-03-22 18:39:29Z vnivanch $
27 //
28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4DeltaAngleFreeScat
34 //
35 // Author: Vladimir Ivantcheko
36 //
37 // Creation date: 23 August 2013
38 //
39 // Modifications:
40 //
41 // Class Description:
42 //
43 // Delta-electron Angular Distribution Generation
44 //
45 // Class Description: End
46 //
47 // -------------------------------------------------------------------
48 //
49 
50 #include "G4DeltaAngleFreeScat.hh"
51 #include "G4PhysicalConstants.hh"
52 #include "Randomize.hh"
53 
54 using namespace std;
55 
57  : G4VEmAngularDistribution("deltaFree")
58 {}
59 
61 {}
62 
65  G4double kinEnergyFinal, G4int,
66  const G4Material*)
67 {
68  G4double deltaMomentum =
69  sqrt(kinEnergyFinal*(kinEnergyFinal + 2*electron_mass_c2));
70 
71  G4double costet = kinEnergyFinal*(dp->GetTotalEnergy() + electron_mass_c2) /
72  (deltaMomentum * dp->GetTotalMomentum());
73 
75  G4double sintet = sqrt((1 - costet)*(1 + costet));
76 
77  fLocalDirection.set(sintet*cos(phi), sintet*sin(phi), costet);
79 
80  return fLocalDirection;
81 }
82 
84 {}
G4DeltaAngleFreeScat(const G4String &name="")
void set(double x, double y, double z)
virtual void PrintGeneratorInformation() const final
virtual G4ThreeVector & SampleDirection(const G4DynamicParticle *dp, G4double kinEnergyFinal, G4int Z, const G4Material *mat=nullptr) final
const G4ThreeVector & GetMomentumDirection() const
Hep3Vector & rotateUz(const Hep3Vector &)
Definition: ThreeVector.cc:38
double G4double
Definition: G4Types.hh:76
static constexpr double electron_mass_c2
#define G4UniformRand()
Definition: Randomize.hh:53
static constexpr double twopi
Definition: G4SIunits.hh:76
int G4int
Definition: G4Types.hh:78
G4double GetTotalMomentum() const
G4double GetTotalEnergy() const