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: G4eCoulombScatteringModel.hh,v 1.49 2009/10/10 15:16:57 vnivanch Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
---|
28 | // |
---|
29 | // ------------------------------------------------------------------- |
---|
30 | // |
---|
31 | // GEANT4 Class header file |
---|
32 | // |
---|
33 | // |
---|
34 | // File name: G4eCoulombScatteringModel |
---|
35 | // |
---|
36 | // Author: Vladimir Ivanchenko |
---|
37 | // |
---|
38 | // Creation date: 19.02.2006 |
---|
39 | // |
---|
40 | // Modifications: |
---|
41 | // 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the |
---|
42 | // logic of building - only elements from G4ElementTable |
---|
43 | // 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim |
---|
44 | // 19.08.06 V.Ivanchenko add inline function ScreeningParameter and |
---|
45 | // make some members protected |
---|
46 | // 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e- |
---|
47 | // 09.06.08 V.Ivanchenko add SelectIsotope and sampling of the recoil ion |
---|
48 | // 17.06.09 C.Consoalndi modified SetupTarget method - remove kinFactor |
---|
49 | // |
---|
50 | // |
---|
51 | // Class Description: |
---|
52 | // |
---|
53 | // Implementation of eCoulombScattering of pointlike charge particle |
---|
54 | // on Atomic Nucleus for interval of scattering anles in Lab system |
---|
55 | // thetaMin - ThetaMax, nucleus recoil is neglected. |
---|
56 | // The model based on analysis of J.M.Fernandez-Varea et al. |
---|
57 | // NIM B73(1993)447 originated from G.Wentzel Z.Phys. 40(1927)590 with |
---|
58 | // screening parameter from H.A.Bethe Phys. Rev. 89 (1953) 1256. |
---|
59 | // |
---|
60 | |
---|
61 | // ------------------------------------------------------------------- |
---|
62 | // |
---|
63 | |
---|
64 | #ifndef G4eCoulombScatteringModel_h |
---|
65 | #define G4eCoulombScatteringModel_h 1 |
---|
66 | |
---|
67 | #include "G4VEmModel.hh" |
---|
68 | #include "G4PhysicsTable.hh" |
---|
69 | #include "globals.hh" |
---|
70 | #include "G4NistManager.hh" |
---|
71 | #include <vector> |
---|
72 | |
---|
73 | class G4ParticleChangeForGamma; |
---|
74 | class G4ParticleDefinition; |
---|
75 | |
---|
76 | class G4eCoulombScatteringModel : public G4VEmModel |
---|
77 | { |
---|
78 | |
---|
79 | public: |
---|
80 | |
---|
81 | G4eCoulombScatteringModel(const G4String& nam = "eCoulombScattering"); |
---|
82 | |
---|
83 | virtual ~G4eCoulombScatteringModel(); |
---|
84 | |
---|
85 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
---|
86 | |
---|
87 | virtual G4double ComputeCrossSectionPerAtom( |
---|
88 | const G4ParticleDefinition*, |
---|
89 | G4double kinEnergy, |
---|
90 | G4double Z, |
---|
91 | G4double A, |
---|
92 | G4double cut, |
---|
93 | G4double emax); |
---|
94 | |
---|
95 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
---|
96 | const G4MaterialCutsCouple*, |
---|
97 | const G4DynamicParticle*, |
---|
98 | G4double tmin, |
---|
99 | G4double maxEnergy); |
---|
100 | |
---|
101 | inline void SetRecoilThreshold(G4double eth); |
---|
102 | |
---|
103 | protected: |
---|
104 | |
---|
105 | G4double CrossSectionPerAtom(); |
---|
106 | |
---|
107 | G4double SampleCosineTheta(); |
---|
108 | |
---|
109 | inline void DefineMaterial(const G4MaterialCutsCouple*); |
---|
110 | |
---|
111 | inline void SetupParticle(const G4ParticleDefinition*); |
---|
112 | |
---|
113 | inline void SetupKinematic(G4double kinEnergy, G4double cut); |
---|
114 | |
---|
115 | inline void SetupTarget(G4double Z, G4double kinEnergy); |
---|
116 | |
---|
117 | private: |
---|
118 | |
---|
119 | void ComputeMaxElectronScattering(G4double cut); |
---|
120 | |
---|
121 | // hide assignment operator |
---|
122 | G4eCoulombScatteringModel & operator=(const G4eCoulombScatteringModel &right); |
---|
123 | G4eCoulombScatteringModel(const G4eCoulombScatteringModel&); |
---|
124 | |
---|
125 | protected: |
---|
126 | |
---|
127 | const G4ParticleDefinition* theProton; |
---|
128 | const G4ParticleDefinition* theElectron; |
---|
129 | const G4ParticleDefinition* thePositron; |
---|
130 | |
---|
131 | G4ParticleTable* theParticleTable; |
---|
132 | G4ParticleChangeForGamma* fParticleChange; |
---|
133 | G4NistManager* fNistManager; |
---|
134 | |
---|
135 | const std::vector<G4double>* pCuts; |
---|
136 | |
---|
137 | const G4MaterialCutsCouple* currentCouple; |
---|
138 | const G4Material* currentMaterial; |
---|
139 | const G4Element* currentElement; |
---|
140 | G4int currentMaterialIndex; |
---|
141 | |
---|
142 | G4double coeff; |
---|
143 | G4double cosThetaMin; |
---|
144 | G4double cosThetaMax; |
---|
145 | G4double cosTetMinNuc; |
---|
146 | G4double cosTetMaxNuc; |
---|
147 | G4double cosTetMaxNuc2; |
---|
148 | G4double cosTetMaxElec; |
---|
149 | G4double cosTetMaxElec2; |
---|
150 | G4double q2Limit; |
---|
151 | G4double recoilThreshold; |
---|
152 | G4double elecXSection; |
---|
153 | G4double nucXSection; |
---|
154 | G4double ecut; |
---|
155 | |
---|
156 | // projectile |
---|
157 | const G4ParticleDefinition* particle; |
---|
158 | |
---|
159 | G4double chargeSquare; |
---|
160 | G4double spin; |
---|
161 | G4double mass; |
---|
162 | G4double tkin; |
---|
163 | G4double mom2; |
---|
164 | G4double invbeta2; |
---|
165 | G4double etag; |
---|
166 | G4double lowEnergyLimit; |
---|
167 | |
---|
168 | // target |
---|
169 | G4double targetZ; |
---|
170 | G4double targetMass; |
---|
171 | G4double screenZ; |
---|
172 | G4double formfactA; |
---|
173 | G4int idxelm; |
---|
174 | G4int iz; |
---|
175 | |
---|
176 | private: |
---|
177 | |
---|
178 | G4double alpha2; |
---|
179 | G4double faclim; |
---|
180 | |
---|
181 | static G4double ScreenRSquare[100]; |
---|
182 | static G4double FormFactor[100]; |
---|
183 | |
---|
184 | G4bool isInitialised; |
---|
185 | }; |
---|
186 | |
---|
187 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
188 | |
---|
189 | inline |
---|
190 | void G4eCoulombScatteringModel::DefineMaterial(const G4MaterialCutsCouple* cup) |
---|
191 | { |
---|
192 | if(cup != currentCouple) { |
---|
193 | currentCouple = cup; |
---|
194 | currentMaterial = cup->GetMaterial(); |
---|
195 | currentMaterialIndex = currentCouple->GetIndex(); |
---|
196 | } |
---|
197 | } |
---|
198 | |
---|
199 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
200 | |
---|
201 | inline |
---|
202 | void G4eCoulombScatteringModel::SetupParticle(const G4ParticleDefinition* p) |
---|
203 | { |
---|
204 | // Initialise mass and charge |
---|
205 | if(p != particle) { |
---|
206 | particle = p; |
---|
207 | mass = particle->GetPDGMass(); |
---|
208 | spin = particle->GetPDGSpin(); |
---|
209 | G4double q = particle->GetPDGCharge()/eplus; |
---|
210 | chargeSquare = q*q; |
---|
211 | tkin = 0.0; |
---|
212 | } |
---|
213 | } |
---|
214 | |
---|
215 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
216 | |
---|
217 | inline void G4eCoulombScatteringModel::SetupKinematic(G4double ekin, |
---|
218 | G4double cut) |
---|
219 | { |
---|
220 | if(ekin != tkin || ecut != cut) { |
---|
221 | tkin = ekin; |
---|
222 | mom2 = tkin*(tkin + 2.0*mass); |
---|
223 | invbeta2 = 1.0 + mass*mass/mom2; |
---|
224 | cosTetMinNuc = cosThetaMin; |
---|
225 | cosTetMaxNuc = cosThetaMax; |
---|
226 | if(mass < MeV && cosThetaMin < 1.0 && ekin <= 10.*cut) { |
---|
227 | cosTetMinNuc = ekin*(cosThetaMin + 1.0)/(10.*cut) - 1.0; |
---|
228 | } |
---|
229 | ComputeMaxElectronScattering(cut); |
---|
230 | } |
---|
231 | } |
---|
232 | |
---|
233 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
234 | |
---|
235 | inline void G4eCoulombScatteringModel::SetupTarget(G4double Z, G4double e) |
---|
236 | { |
---|
237 | if(Z != targetZ || e != etag) { |
---|
238 | etag = e; |
---|
239 | targetZ = Z; |
---|
240 | iz= G4int(Z); |
---|
241 | if(iz > 99) iz = 99; |
---|
242 | targetMass = fNistManager->GetAtomicMassAmu(iz)*amu_c2; |
---|
243 | screenZ = ScreenRSquare[iz]/mom2; |
---|
244 | screenZ *=(1.13 + std::min(1.0,3.76*Z*Z*invbeta2*alpha2)); |
---|
245 | if(mass > MeV) { screenZ *= 2.0; } |
---|
246 | formfactA = FormFactor[iz]*mom2; |
---|
247 | cosTetMaxNuc2 = cosTetMaxNuc; |
---|
248 | if(1 == iz && particle == theProton && cosTetMaxNuc2 < 0.0) { |
---|
249 | cosTetMaxNuc2 = 0.0; |
---|
250 | } |
---|
251 | cosTetMaxElec2 = cosTetMaxElec; |
---|
252 | } |
---|
253 | } |
---|
254 | |
---|
255 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
256 | |
---|
257 | inline void G4eCoulombScatteringModel::SetRecoilThreshold(G4double eth) |
---|
258 | { |
---|
259 | recoilThreshold = eth; |
---|
260 | } |
---|
261 | |
---|
262 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
263 | |
---|
264 | #endif |
---|