source: trunk/source/processes/electromagnetic/muons/include/G4MuPairProductionModel.hh@ 1201

Last change on this file since 1201 was 1196, checked in by garnier, 16 years ago

update CVS release candidate geant4.9.3.01
File size: 7.2 KB
Line 
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: G4MuPairProductionModel.hh,v 1.28 2009/02/20 14:48:16 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03-cand-01 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class header file
32//
33//
34// File name: G4MuPairProductionModel
35//
36// Author: Vladimir Ivanchenko on base of Laszlo Urban code
37//
38// Creation date: 18.05.2002
39//
40// Modifications:
41//
42// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
43// 27-01-03 Make models region aware (V.Ivanchenko)
44// 13-02-03 Add name (V.Ivanchenko)
45// 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
46// 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
47// 13-02-06 Add ComputeCrossSectionPerAtom (mma)
48// 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov)
49// 11-10-07 Add ignoreCut flag (V.Ivanchenko)
50// 28-02-08 Reorganized protected methods and members (V.Ivanchenko)
51
52//
53// Class Description:
54//
55// Implementation of e+e- pair production by muons
56//
57
58// -------------------------------------------------------------------
59//
60
61#ifndef G4MuPairProductionModel_h
62#define G4MuPairProductionModel_h 1
63
64#include "G4VEmModel.hh"
65#include "G4NistManager.hh"
66#include <vector>
67
68class G4Element;
69class G4ParticleChangeForLoss;
70class G4ParticleChangeForGamma;
71
72class G4MuPairProductionModel : public G4VEmModel
73{
74public:
75
76 G4MuPairProductionModel(const G4ParticleDefinition* p = 0,
77 const G4String& nam = "muPairProd");
78
79 virtual ~G4MuPairProductionModel();
80
81 virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
82
83
84 virtual G4double ComputeCrossSectionPerAtom(
85 const G4ParticleDefinition*,
86 G4double kineticEnergy,
87 G4double Z, G4double A,
88 G4double cutEnergy,
89 G4double maxEnergy);
90
91 virtual G4double ComputeDEDXPerVolume(const G4Material*,
92 const G4ParticleDefinition*,
93 G4double kineticEnergy,
94 G4double cutEnergy);
95
96 virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
97 const G4MaterialCutsCouple*,
98 const G4DynamicParticle*,
99 G4double tmin,
100 G4double maxEnergy);
101
102 virtual G4double MinEnergyCut(const G4ParticleDefinition*,
103 const G4MaterialCutsCouple*);
104
105 inline void SetLowestKineticEnergy(G4double e);
106
107 inline void SetParticle(const G4ParticleDefinition*);
108
109protected:
110
111 G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut,
112 G4double tmax);
113
114 G4double ComputeMicroscopicCrossSection(G4double tkin,
115 G4double Z,
116 G4double cut);
117
118 virtual G4double ComputeDMicroscopicCrossSection(G4double tkin,
119 G4double Z,
120 G4double pairEnergy);
121
122 virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
123 G4double kineticEnergy);
124
125 inline void SetCurrentElement(G4double Z);
126
127private:
128
129 const G4Element* SelectRandomAtom(G4double kinEnergy,
130 G4double dt,
131 G4int it,
132 const G4MaterialCutsCouple* couple,
133 G4double tmin);
134
135 void MakeSamplingTables();
136
137 inline G4double InterpolatedIntegralCrossSection(
138 G4double dt, G4double dz, G4int iz,
139 G4int it, G4int iy, G4double z);
140
141 // hide assignment operator
142 G4MuPairProductionModel & operator=(const G4MuPairProductionModel &right);
143 G4MuPairProductionModel(const G4MuPairProductionModel&);
144
145protected:
146
147 const G4ParticleDefinition* particle;
148 G4NistManager* nist;
149
150 G4double factorForCross;
151 G4double sqrte;
152 G4double particleMass;
153 G4double currentZ;
154 G4double z13;
155 G4double z23;
156 G4double lnZ;
157
158 static G4double xgi[8],wgi[8];
159
160private:
161
162 G4ParticleDefinition* theElectron;
163 G4ParticleDefinition* thePositron;
164 G4ParticleChangeForLoss* fParticleChange;
165
166 G4double minPairEnergy;
167 G4double lowestKinEnergy;
168
169 // tables for sampling
170 G4int nzdat;
171 G4int ntdat;
172 G4int nbiny;
173 size_t nmaxElements;
174 static G4double zdat[5],adat[5],tdat[8];
175 G4double ya[1001],proba[5][8][1001];
176
177 G4double ymin;
178 G4double ymax;
179 G4double dy;
180
181 G4bool samplingTablesAreFilled;
182 std::vector<G4double> partialSum;
183};
184
185//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
186
187inline void G4MuPairProductionModel::SetLowestKineticEnergy(G4double e)
188{
189 lowestKinEnergy = e;
190}
191
192//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
193
194inline
195void G4MuPairProductionModel::SetParticle(const G4ParticleDefinition* p)
196{
197 if(!particle) {
198 particle = p;
199 particleMass = particle->GetPDGMass();
200 }
201}
202
203//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
204
205inline void G4MuPairProductionModel::SetCurrentElement(G4double Z)
206{
207 if(Z != currentZ) {
208 currentZ = Z;
209 G4int iz = G4int(Z);
210 z13 = nist->GetZ13(iz);
211 z23 = z13*z13;
212 lnZ = nist->GetLOGZ(iz);
213 }
214}
215
216//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
217
218inline G4double G4MuPairProductionModel::InterpolatedIntegralCrossSection(
219 G4double dt, G4double dz,
220 G4int iz, G4int it, G4int iy, G4double z)
221{
222 G4double fac = 1./(zdat[iz] *(zdat[iz] +1.));
223 G4double fac1 = 1./(zdat[iz-1]*(zdat[iz-1]+1.));
224 G4double f0 = fac1*proba[iz-1][it-1][iy] +
225 (fac*proba[iz][it-1][iy]-fac1*proba[iz-1][it-1][iy])*dz;
226 G4double f1 = fac1*proba[iz-1][it ][iy] +
227 (fac*proba[iz][it ][iy]-fac1*proba[iz-1][it ][iy])*dz;
228 return (f0 + (f1-f0)*dt)*z*(z+1.);
229}
230
231//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
232
233#endif
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