ECCE @ EIC Software
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
G4WentzelOKandVIxSection.hh
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4WentzelOKandVIxSection.hh
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 //
27 // -------------------------------------------------------------------
28 //
29 //
30 // GEANT4 Class header file
31 //
32 //
33 // File name: G4WentzelOKandVIxSection
34 //
35 // Authors: V.Ivanchenko and O.Kadri
36 //
37 // Creation date: 21.05.2010
38 //
39 // Modifications:
40 //
41 //
42 // Class Description:
43 //
44 // Implementation of the computation of total and transport cross sections,
45 // sample scattering angle for the single scattering case.
46 // to be used by single and multiple scattering models. References:
47 // 1) G.Wentzel, Z. Phys. 40 (1927) 590.
48 // 2) J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
49 //
50 // -------------------------------------------------------------------
51 //
52 
53 #ifndef G4WentzelOKandVIxSection_h
54 #define G4WentzelOKandVIxSection_h 1
55 
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 
58 #include "globals.hh"
59 #include "G4Material.hh"
60 #include "G4Element.hh"
61 #include "G4ElementVector.hh"
62 #include "G4NistManager.hh"
64 #include "G4ThreeVector.hh"
65 #include "G4Pow.hh"
66 #include "G4Threading.hh"
67 
70 
71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72 
74 {
75 
76 public:
77 
78  explicit G4WentzelOKandVIxSection(G4bool comb=true);
79 
80  virtual ~G4WentzelOKandVIxSection();
81 
82  void Initialise(const G4ParticleDefinition*, G4double CosThetaLim);
83 
85 
86  // return cos(ThetaMax) for msc and cos(thetaMin) for single scattering
87  // cut = DBL_MAX means no scattering off electrons
88  G4double SetupKinematic(G4double kinEnergy, const G4Material* mat);
90 
92 
94  G4double CosThetaMax,
95  G4double elecRatio);
96 
98 
99  inline G4double ComputeNuclearCrossSection(G4double CosThetaMin,
100  G4double CosThetaMax);
101 
102  inline G4double ComputeElectronCrossSection(G4double CosThetaMin,
103  G4double CosThetaMax);
104 
105  inline void SetTargetMass(G4double value);
106 
107  inline G4double GetMomentumSquare() const;
108 
109  inline G4double GetCosThetaNuc() const;
110 
111  inline G4double GetCosThetaElec() const;
112 
113 protected:
114 
116 
117  void InitialiseA();
118 
120 
125 
128 
130 
132 
134 
135  // integer parameters
138 
140 
142 
143  // single scattering parameters
149 
150  // projectile
152 
165 
166  // target
178 
180  static G4double ScreenRSquare[100];
181  static G4double FormFactor[100];
182 
183 #ifdef G4MULTITHREADED
184  static G4Mutex WentzelOKandVIxSectionMutex;
185 #endif
186 
187 private:
188  // hide assignment operator
189  G4WentzelOKandVIxSection & operator=
190  (const G4WentzelOKandVIxSection &right) = delete;
192 };
193 
194 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
195 
197 {
198  targetMass = value;
199  factD = std::sqrt(mom2)/value;
200 }
201 
202 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
203 
205 {
206  return mom2;
207 }
208 
209 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
210 
212 {
213  return cosTetMaxNuc;
214 }
215 
216 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
217 
219 {
220  return cosTetMaxElec;
221 }
222 
223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
224 
225 inline G4double
227  G4double cosTMax)
228 {
229  return targetZ*kinFactor*fMottFactor*(cosTMin - cosTMax)/
230  ((1.0 - cosTMin + screenZ)*(1.0 - cosTMax + screenZ));
231 }
232 
233 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
234 
235 inline G4double
237  G4double cosTMax)
238 {
239  G4double cost1 = std::max(cosTMin,cosTetMaxElec);
240  G4double cost2 = std::max(cosTMax,cosTetMaxElec);
241  return (cost1 <= cost2) ? 0.0 : kinFactor*fMottFactor*(cost1 - cost2)/
242  ((1.0 - cost1 + screenZ)*(1.0 - cost2 + screenZ));
243 }
244 
246 {
247  return 3.0*(std::sin(x) - x*std::cos(x))/(x*x*x);
248 }
249 
250 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
251 
252 #endif
253