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25 // 25 //
>> 26 // $Id: G4hBremsstrahlungModel.cc,v 1.3 2008/07/22 16:15:16 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-02 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4hBremsstrahlungModel 34 // File name: G4hBremsstrahlungModel
33 // 35 //
34 // Author: Vladimir Ivanchenko on base 36 // Author: Vladimir Ivanchenko on base of G4MuBremsstrahlungModel
35 // 37 //
36 // Creation date: 28.02.2008 38 // Creation date: 28.02.2008
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 41 //
40 42
41 // 43 //
42 // Class Description: 44 // Class Description:
43 // 45 //
44 // 46 //
45 // ------------------------------------------- 47 // -------------------------------------------------------------------
46 // 48 //
47 //....oooOO0OOooo........oooOO0OOooo........oo 49 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
48 //....oooOO0OOooo........oooOO0OOooo........oo 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49 51
50 #include "G4hBremsstrahlungModel.hh" 52 #include "G4hBremsstrahlungModel.hh"
51 #include "G4PhysicalConstants.hh" <<
52 #include "G4SystemOfUnits.hh" <<
53 #include "G4Log.hh" <<
54 #include "G4NistManager.hh" <<
55 53
56 using namespace std; 54 using namespace std;
57 55
58 G4hBremsstrahlungModel::G4hBremsstrahlungModel 56 G4hBremsstrahlungModel::G4hBremsstrahlungModel(const G4ParticleDefinition* p,
59 const G4String& nam) 57 const G4String& nam)
60 : G4MuBremsstrahlungModel(p, nam) 58 : G4MuBremsstrahlungModel(p, nam)
61 {} 59 {}
62 60
63 //....oooOO0OOooo........oooOO0OOooo........oo 61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64 62
65 G4hBremsstrahlungModel::~G4hBremsstrahlungMode 63 G4hBremsstrahlungModel::~G4hBremsstrahlungModel()
66 {} 64 {}
67 65
68 //....oooOO0OOooo........oooOO0OOooo........oo 66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69 67
70 G4double G4hBremsstrahlungModel::ComputeDMicro 68 G4double G4hBremsstrahlungModel::ComputeDMicroscopicCrossSection(
71 G4d 69 G4double tkin,
72 G4d 70 G4double Z,
73 G4d 71 G4double gammaEnergy)
74 // differential cross section 72 // differential cross section
75 { 73 {
76 G4double dxsection = 0.; 74 G4double dxsection = 0.;
77 75
78 if(gammaEnergy > tkin) return dxsection; << 76 if( gammaEnergy > tkin) return dxsection ;
79 // G4cout << "G4hBremsstrahlungModel m= " < 77 // G4cout << "G4hBremsstrahlungModel m= " << mass
80 // << " " << particle->GetParticleName() 78 // << " " << particle->GetParticleName() << G4endl;
81 G4double E = tkin + mass ; 79 G4double E = tkin + mass ;
82 G4double v = gammaEnergy/E ; 80 G4double v = gammaEnergy/E ;
83 G4double delta = 0.5*mass*mass*v/(E-gammaEne << 81 G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
84 G4double rab0=delta*sqrte ; 82 G4double rab0=delta*sqrte ;
85 83
86 G4int iz = std::max(G4lrint(Z), 1); << 84 G4int iz = G4int(Z);
>> 85 if(iz < 1) iz = 1;
87 86
88 G4double z13 = 1.0/nist->GetZ13(iz); 87 G4double z13 = 1.0/nist->GetZ13(iz);
89 G4double dn = mass*nist->GetA27(iz)/(70.*Me 88 G4double dn = mass*nist->GetA27(iz)/(70.*MeV);
90 89
91 G4double b = (1 == iz) ? bh : btf; << 90 G4double b = btf;
>> 91 if(1 == iz) b = bh;
92 92
93 // nucleus contribution logarithm 93 // nucleus contribution logarithm
94 G4double rab1=b*z13; 94 G4double rab1=b*z13;
95 G4double fn=G4Log(rab1/(dn*(electron_mass_c2 << 95 G4double fn=log(rab1/(dn*(electron_mass_c2+rab0*rab1))*
96 (mass+delta*(dn*sqrte-2.))) ; 96 (mass+delta*(dn*sqrte-2.))) ;
97 fn = std::max(fn, 0.0); << 97 if(fn <0.) fn = 0. ;
98 98
99 G4double x = 1.0 - v; 99 G4double x = 1.0 - v;
100 if(particle->GetPDGSpin() != 0) { x += 0.75* << 100 if(particle->GetPDGSpin() != 0) x += 0.75*v*v;
101 101
102 dxsection = coeff*x*Z*Z*fn/gammaEnergy; 102 dxsection = coeff*x*Z*Z*fn/gammaEnergy;
103 103
104 return dxsection; 104 return dxsection;
105 } 105 }
106 106
107 //....oooOO0OOooo........oooOO0OOooo........oo 107 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
108 108