| Geant4 Cross Reference |
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 // GEANT4 physics class: G4ElectroNuclearCrossSection -- header file
28 // M.V. Kossov, ITEP(Moscow), 24-OCT-01
29 // The last update: M.V. Kossov, CERN/ITEP (Moscow) 25-Sept-03
30
31 // A. Dotti 2-May-2013: Re-write caching logic and optimizations
32
33 #ifndef G4ElectroNuclearCrossSection_h
34 #define G4ElectroNuclearCrossSection_h 1
35
36 #include "G4VCrossSectionDataSet.hh"
37 #include "G4DynamicParticle.hh"
38 #include "G4Element.hh"
39 #include "G4ParticleTable.hh"
40 #include "G4NucleiProperties.hh"
41 #include "G4NistManager.hh"
42 #include <vector>
43 #include "Randomize.hh"
44 #include "G4Electron.hh"
45 #include "G4Positron.hh"
46 #include <map>
47
48 //A cache element
49 struct cacheEl_t {
50 G4int F;
51 G4double* J1;
52 G4double* J2;
53 G4double* J3;
54 G4double H;
55 G4double TH;
56 };
57
58 class G4ElectroNuclearCrossSection : public G4VCrossSectionDataSet
59 {
60 public:
61
62 G4ElectroNuclearCrossSection();
63 virtual ~G4ElectroNuclearCrossSection();
64
65 static const char* Default_Name() {return "ElectroNuclearXS";}
66
67 virtual void CrossSectionDescription(std::ostream&) const;
68
69 virtual G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z,
70 const G4Material*);
71 virtual G4double GetElementCrossSection(const G4DynamicParticle*, G4int Z,
72 const G4Material* mat);
73
74 G4double GetEquivalentPhotonEnergy();
75
76 G4double GetVirtualFactor(G4double nu, G4double Q2);
77
78 G4double GetEquivalentPhotonQ2(G4double nu);
79
80 private:
81 G4int GetFunctions(G4double a, G4double* x, G4double* y, G4double* z);
82
83 G4double ThresholdEnergy(G4int Z, G4int N);
84 G4double SolveTheEquation(G4double f);
85 G4double Fun(G4double x);
86 G4double DFun(G4double x);
87
88 G4double HighEnergyJ1(G4double lE);
89 G4double HighEnergyJ2(G4double lE, G4double E);
90 G4double HighEnergyJ3(G4double lE, G4double E2);
91
92 // Body
93 private:
94 G4int currentN;
95 G4int currentZ;
96
97 //Cache structure
98 G4int lastZ;
99 std::vector<cacheEl_t*> cache;
100 cacheEl_t* lastUsedCacheEl;
101 G4NistManager* nistmngr;
102
103 //Cache values for XS
104 G4double lastE ; //Last used energy value
105 G4double lastSig; //Last used XS value
106 G4double lastG; //Last value of gamma=lnE-ln(me)
107 G4int lastL; //Last used in the cross section TheLastBin
108
109 const G4double mNeut;
110 const G4double mProt;
111 };
112
113 #endif
114