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25 //
26 // G4IonCoulombCrossSection.hh
27 //-------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 // File name: G4IonCoulombCrossSection
32 //
33 // Author: Cristina Consolandi
34 //
35 // Creation date: 05.10.2010 from G4eCoulombScatteringModel
36 //
37 // Class Description:
38 // Computation of Screen-Coulomb Cross Section
39 // for protons, alpha and heavy Ions
40 //
41 //
42 // Reference:
43 // M.J. Boschini et al. "Nuclear and Non-Ionizing Energy-Loss
44 // for Coulomb Scattered Particles from Low Energy up to Relativistic
45 // Regime in Space Radiation Environment"
46 // Accepted for publication in the Proceedings of the ICATPP Conference
47 // on Cosmic Rays for Particle and Astroparticle Physics, Villa Olmo, 7-8
48 // October, 2010, to be published by World Scientific (Singapore).
49 //
50 // Available for downloading at:
51 // http://arxiv.org/abs/1011.4822
52 //
53 // -------------------------------------------------------------------
54
55 //
56 #ifndef G4IonCoulombCrossSection_h
57 #define G4IonCoulombCrossSection_h 1
58
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60
61 #include <CLHEP/Units/SystemOfUnits.h>
62
63 #include "globals.hh"
64 #include "G4NistManager.hh"
65 #include "G4ParticleDefinition.hh"
66
67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68
69 class G4IonCoulombCrossSection
70 {
71 public:
72
73 explicit G4IonCoulombCrossSection();
74
75 ~G4IonCoulombCrossSection() = default;
76
77 void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);
78
79 G4double NuclearCrossSection();
80
81 G4double SampleCosineTheta();
82
83 void SetupKinematic(G4double kinEnergy, G4double tmass);
84
85 void SetupTarget(G4double Z, G4double kinEnergy, G4int heavycorr);
86
87 inline void SetupParticle(const G4ParticleDefinition*);
88
89 inline G4double GetMomentum2();
90
91 G4IonCoulombCrossSection & operator=
92 (const G4IonCoulombCrossSection &right) = delete;
93 G4IonCoulombCrossSection(const G4IonCoulombCrossSection&) = delete;
94
95 private:
96
97 void SetScreenRSquare(G4int iz);
98
99 const G4ParticleDefinition* theProton;
100
101 G4NistManager* fNistManager;
102 G4Pow* fG4pow;
103
104 G4double coeff;
105
106 //cost - min - max
107 G4double cosThetaMin;// def 1.0
108 G4double cosThetaMax;// def -1.0
109 //SetupTarget
110 G4double cosTetMinNuc;// -->cosThetaMin
111 G4double cosTetMaxNuc;// -->cosThetaMax
112
113 //cross section
114 G4double nucXSection;
115
116 //energy
117 G4double etag;
118
119 // projectile........................
120 const G4ParticleDefinition* particle;
121
122 G4double chargeSquare;
123 G4double spin;
124 G4double mass;
125
126 //lab of incedent particle
127 G4double tkinLab;
128 G4double momLab2;
129 G4double invbetaLab2;
130
131 //relative system with nucleus
132 G4double tkin;
133 G4double mom2;
134 G4double invbeta2;
135
136 // target nucleus
137 G4double targetZ;
138 G4double targetMass;
139 G4double screenZ;
140 G4double alpha2;
141 G4double ScreenRSquare;
142 };
143
144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
145
146 inline
147 void G4IonCoulombCrossSection::SetupParticle(const G4ParticleDefinition* p)
148 {
149 particle = p;
150 mass = particle->GetPDGMass();
151 spin = particle->GetPDGSpin();
152 if(0.0 != spin) { spin = 0.5; }
153 G4double q = particle->GetPDGCharge()/CLHEP::eplus;
154 chargeSquare = q*q;
155 tkin = 0.0;
156 }
157 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
158
159 inline G4double G4IonCoulombCrossSection::GetMomentum2()
160 {
161 return mom2;
162 }
163 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
164
165 #endif
166
167
168