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G4hBremsstrahlungModel.cc
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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4hBremsstrahlungModel
33 //
34 // Author: Vladimir Ivanchenko on base of G4MuBremsstrahlungModel
35 //
36 // Creation date: 28.02.2008
37 //
38 // Modifications:
39 //
40 
41 //
42 // Class Description:
43 //
44 //
45 // -------------------------------------------------------------------
46 //
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49 
50 #include "G4hBremsstrahlungModel.hh"
51 #include "G4PhysicalConstants.hh"
52 #include "G4SystemOfUnits.hh"
53 #include "G4Log.hh"
54 
55 using namespace std;
56 
57 G4hBremsstrahlungModel::G4hBremsstrahlungModel(const G4ParticleDefinition* p,
58  const G4String& nam)
59  : G4MuBremsstrahlungModel(p, nam)
60 {}
61 
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63 
64 G4hBremsstrahlungModel::~G4hBremsstrahlungModel()
65 {}
66 
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68 
69 G4double G4hBremsstrahlungModel::ComputeDMicroscopicCrossSection(
70  G4double tkin,
71  G4double Z,
72  G4double gammaEnergy)
73 // differential cross section
74 {
75  G4double dxsection = 0.;
76 
77  if( gammaEnergy > tkin) return dxsection ;
78  // G4cout << "G4hBremsstrahlungModel m= " << mass
79  // << " " << particle->GetParticleName() << G4endl;
80  G4double E = tkin + mass ;
81  G4double v = gammaEnergy/E ;
82  G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
83  G4double rab0=delta*sqrte ;
84 
85  G4int iz = G4int(Z);
86  if(iz < 1) { iz = 1; }
87 
88  G4double z13 = 1.0/nist->GetZ13(iz);
89  G4double dn = mass*nist->GetA27(iz)/(70.*MeV);
90 
91  G4double b = btf;
92  if(1 == iz) b = bh;
93 
94  // nucleus contribution logarithm
95  G4double rab1=b*z13;
96  G4double fn=G4Log(rab1/(dn*(electron_mass_c2+rab0*rab1))*
97  (mass+delta*(dn*sqrte-2.))) ;
98  if(fn <0.) fn = 0. ;
99 
100  G4double x = 1.0 - v;
101  if(particle->GetPDGSpin() != 0) { x += 0.75*v*v; }
102 
103  dxsection = coeff*x*Z*Z*fn/gammaEnergy;
104 
105  return dxsection;
106 }
107 
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