Geant4  10.03.p02
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
G4DNABornAngle.cc
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
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 {
62  fElectron = G4Electron::Electron();
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)
virtual G4ThreeVector & SampleDirection(const G4DynamicParticle *dp, G4double kinEnergyFinal, G4int Z, const G4Material *mat=0)
G4double GetKineticEnergy() const
virtual G4ThreeVector & SampleDirectionForShell(const G4DynamicParticle *dp, G4double kinEnergyFinal, G4int Z, G4int shellIdx, const G4Material *mat=0)
G4ParticleDefinition * GetDefinition() const
int G4int
Definition: G4Types.hh:78
static constexpr double twopi
Definition: G4SIunits.hh:76
virtual ~G4DNABornAngle()
void PrintGeneratorInformation() const
#define G4UniformRand()
Definition: Randomize.hh:97
const G4ThreeVector & GetMomentumDirection() const
Hep3Vector & rotateUz(const Hep3Vector &)
Definition: ThreeVector.cc:38
static constexpr double eV
Definition: G4SIunits.hh:215
float electron_mass_c2
Definition: hepunit.py:274
G4double GetPDGMass() const
G4DNABornAngle(const G4String &name="")
static G4Electron * Electron()
Definition: G4Electron.cc:94
double G4double
Definition: G4Types.hh:76