Geant4  10.01
G4DeltaAngleFreeScat.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: 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 
74  G4double phi = G4UniformRand()*twopi;
75  G4double sintet = sqrt((1 - costet)*(1 + costet));
76 
77  fLocalDirection.set(sintet*cos(phi), sintet*sin(phi), costet);
78  fLocalDirection.rotateUz(dp->GetMomentumDirection());
79 
80  return fLocalDirection;
81 }
82 
84 {}
CLHEP::Hep3Vector G4ThreeVector
G4double GetTotalEnergy() const
virtual G4ThreeVector & SampleDirection(const G4DynamicParticle *dp, G4double kinEnergyFinal, G4int Z, const G4Material *mat=0)
int G4int
Definition: G4Types.hh:78
G4double GetTotalMomentum() const
void PrintGeneratorInformation() const
#define G4UniformRand()
Definition: Randomize.hh:95
const G4ThreeVector & GetMomentumDirection() const
G4DeltaAngleFreeScat(const G4String &name="")
double G4double
Definition: G4Types.hh:76