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G4DNABornAngle.cc
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26 // $Id: G4DNABornAngle.cc 68380 2013-03-22 18:39:29Z vnivanch $
27 //
28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4DNABornAngle
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 "G4DNABornAngle.hh"
51 #include "G4PhysicalConstants.hh"
52 #include "Randomize.hh"
53 #include "G4ParticleDefinition.hh"
54 #include "G4Electron.hh"
55 #include "G4SystemOfUnits.hh"
56 
57 using namespace std;
58 
60  : G4VEmAngularDistribution("deltaBorn")
61 {
63 }
64 
66 {}
67 
70  G4double secKinetic, G4int,
71  G4int,
72  const G4Material*)
73 {
74  G4double k = dp->GetKineticEnergy();
75  G4double cosTheta = 1.0;
76  if (dp->GetDefinition() == fElectron)
77  {
78  if (secKinetic < 50.*eV) cosTheta = (2.*G4UniformRand())-1.;
79  else if (secKinetic <= 200.*eV)
80  {
81  if (G4UniformRand() <= 0.1) cosTheta = (2.*G4UniformRand())-1.;
82  else cosTheta = G4UniformRand()*(std::sqrt(2.)/2);
83  }
84  else
85  {
86  G4double sin2O =
87  (1.-secKinetic/k)/(1.+secKinetic/(2.*electron_mass_c2));
88  cosTheta = std::sqrt(1.-sin2O);
89  }
90  }
91  else
92  {
93  G4double mass = dp->GetDefinition()->GetPDGMass();
94  G4double maxSecKinetic = 4.* (electron_mass_c2 / mass) * k;
95 
96  // cosTheta = std::sqrt(secKinetic / maxSecKinetic);
97 
98  // Restriction below 100 eV from Emfietzoglou (2000)
99 
100  if (secKinetic>100*eV) cosTheta = std::sqrt(secKinetic / maxSecKinetic);
101  else cosTheta = (2.*G4UniformRand())-1.;
102  }
103 
104  G4double sint = sqrt((1.0 - cosTheta)*(1.0 + cosTheta));
105  G4double phi = twopi*G4UniformRand();
106 
107  fLocalDirection.set(sint*cos(phi), sint*sin(phi), cosTheta);
109 
110  return fLocalDirection;
111 }
112 
115  G4double secEkin, G4int Z,
116  const G4Material* mat)
117 {
118  return SampleDirectionForShell(dp, secEkin, Z, 0, mat);
119 }
120 
122 {}
void set(double x, double y, double z)
const G4ThreeVector & GetMomentumDirection() const
virtual G4ThreeVector & SampleDirection(const G4DynamicParticle *dp, G4double kinEnergyFinal, G4int Z, const G4Material *mat=0)
Hep3Vector & rotateUz(const Hep3Vector &)
Definition: ThreeVector.cc:38
G4double GetPDGMass() const
Float_t Z
double G4double
Definition: G4Types.hh:76
G4ParticleDefinition * GetDefinition() const
static constexpr double electron_mass_c2
virtual G4ThreeVector & SampleDirectionForShell(const G4DynamicParticle *dp, G4double kinEnergyFinal, G4int Z, G4int shellIdx, const G4Material *mat=0)
#define G4UniformRand()
Definition: Randomize.hh:53
static constexpr double twopi
Definition: G4SIunits.hh:76
static constexpr double eV
Definition: G4SIunits.hh:215
Float_t mat
static G4Electron * Electron()
Definition: G4Electron.cc:94
void PrintGeneratorInformation() const
int G4int
Definition: G4Types.hh:78
G4double GetKineticEnergy() const
virtual ~G4DNABornAngle()
G4DNABornAngle(const G4String &name="")
const G4ParticleDefinition * fElectron