ECCE @ EIC Software
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
G4DNABornAngle.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4DNABornAngle.cc
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 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4DNABornAngle
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 "G4DNABornAngle.hh"
50 #include "G4PhysicalConstants.hh"
51 #include "Randomize.hh"
52 #include "G4ParticleDefinition.hh"
53 #include "G4Electron.hh"
54 #include "G4SystemOfUnits.hh"
55 
56 using namespace std;
57 
59  : G4VEmAngularDistribution("deltaBorn")
60 {
62 }
63 
65 {}
66 
69  G4double secKinetic, G4int,
70  G4int,
71  const G4Material*)
72 {
73  G4double k = dp->GetKineticEnergy();
74  G4double cosTheta = 1.0;
75  if (dp->GetDefinition() == fElectron)
76  {
77  if (secKinetic < 50.*eV) cosTheta = (2.*G4UniformRand())-1.;
78  else if (secKinetic <= 200.*eV)
79  {
80  if (G4UniformRand() <= 0.1) cosTheta = (2.*G4UniformRand())-1.;
81  else cosTheta = G4UniformRand()*(std::sqrt(2.)/2);
82  }
83  else
84  {
85  G4double sin2O =
86  (1.-secKinetic/k)/(1.+secKinetic/(2.*electron_mass_c2));
87  cosTheta = std::sqrt(1.-sin2O);
88  }
89  }
90  else
91  {
93  G4double maxSecKinetic = 4.* (electron_mass_c2 / mass) * k;
94 
95  // cosTheta = std::sqrt(secKinetic / maxSecKinetic);
96 
97  // Restriction below 100 eV from Emfietzoglou (2000)
98 
99  if (secKinetic>100*eV) cosTheta = std::sqrt(secKinetic / maxSecKinetic);
100  else cosTheta = (2.*G4UniformRand())-1.;
101  }
102 
103  G4double sint = sqrt((1.0 - cosTheta)*(1.0 + cosTheta));
105 
106  fLocalDirection.set(sint*cos(phi), sint*sin(phi), cosTheta);
108 
109  return fLocalDirection;
110 }
111 
114  G4double secEkin, G4int Z,
115  const G4Material* mat)
116 {
117  return SampleDirectionForShell(dp, secEkin, Z, 0, mat);
118 }
119 
121 {}