source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/cross_sections/include/G4QMuonNuclearCrossSection.hh @ 1340

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27// $Id: G4QMuonNuclearCrossSection.hh,v 1.1 2009/11/16 18:15:42 mkossov Exp $
28// GEANT4 tag $Name: hadr-chips-V09-03-08 $
29//
30//
31// GEANT4 physics class: G4QMuonNuclearCrossSection -- header file
32// M.V. Kossov, CERN-ITEP(Moscow), 4-FEB-2004
33// The last update: M.V. Kossov, CERN/ITEP (Moscow) 4-Feb-04
34//
35// Short description: this G4 singletone class calculates muonNuclear cross section for
36// the particular isotope (GetCrossSection member function)
37// ****************************************************************************************
38// ********* This HEADER is temporary moved from the photolepton_hadron directory *********
39// ******* DO NOT MAKE ANY CHANGE! With time it'll move back to photolepton...(M.K.) ******
40// ****************************************************************************************
41// Short description: reaction cross-sections for muon-nuclear reactions, which
42// are integrals over virtual equivalent photons photons. The muon-nuclear GHAD
43// model (not CHIPS) gives 2-3 times smaller scattering angle and deposited energy.
44// --------------------------------------------------------------------------------
45
46#ifndef G4QMuonNuclearCrossSection_h
47#define G4QMuonNuclearCrossSection_h 1
48
49#include "G4ParticleTable.hh"
50#include "G4NucleiProperties.hh"
51#include <vector>
52#include "Randomize.hh"
53#include "G4MuonPlus.hh"
54#include "G4MuonMinus.hh"
55#include "G4VQCrossSection.hh"
56
57class G4QMuonNuclearCrossSection : public G4VQCrossSection
58{
59protected:
60
61  G4QMuonNuclearCrossSection()  {};
62
63public:
64
65  ~G4QMuonNuclearCrossSection();
66
67  static G4VQCrossSection* GetPointer(); // Gives a pointer to this singletone
68
69  G4double ThresholdEnergy(G4int Z, G4int N, G4int PDG=13);
70
71  // At present momentum (pMom) must be in GeV (@@ Units)
72  virtual G4double GetCrossSection(G4bool fCS, G4double pMom, G4int tgZ, G4int tgN,
73                                                                             G4int pPDG=0);
74
75  G4double CalculateCrossSection(G4bool CS, G4int F, G4int I, G4int PDG, G4int Z, G4int N,
76                                                                        G4double Momentum);
77
78  G4int    GetExchangePDGCode();
79
80  G4double GetExchangeEnergy();
81
82  G4double GetVirtualFactor(G4double nu, G4double Q2);
83
84  G4double GetExchangeQ2(G4double nu);
85
86private:
87  G4int    GetFunctions(G4double a, G4double* x, G4double* y, G4double* z);
88  G4double HighEnergyJ1(G4double lE);
89  G4double HighEnergyJ2(G4double lE);
90  G4double HighEnergyJ3(G4double lE);
91  G4double SolveTheEquation(G4double f);
92  G4double Fun(G4double x);
93  G4double DFun(G4double x);
94
95// Body
96private:
97  static G4bool    onlyCS;   // flag to calculate only CS
98  static G4double  lastSig;  // Last calculated cross section
99  static G4int     lastL;    // Last used in the cross section TheLastBin
100  static G4double  lastE;    // Last used in the cross section Energy
101  static G4int     lastF;    // Last used in the cross section TheFirstBin
102  static G4double  lastG;    // Last value of gamma=lnE-ln(m)
103  static G4double  lastH;    // Last value of the High energy A-dependence
104  static G4double* lastJ1;   // Pointer to the last array of the J1 function
105  static G4double* lastJ2;   // Pointer to the last array of the J2 function
106  static G4double* lastJ3;   // Pointer to the last array of the J3 function
107  static G4int     lastPDG;  // The last projectile PDG
108  static G4int     lastN;    // The last N of calculated nucleus
109  static G4int     lastZ;    // The last Z of calculated nucleus
110  static G4double  lastP;    // Last used in the cross section Momentum
111  static G4double  lastTH;   // Last value of the Momentum Threshold
112  static G4double  lastCS;   // Last value of the Cross Section
113  static G4int     lastI;    // The last position in the DAMDB
114  static std::vector <G4double*>* J1; // Vector of pointers to the J1 tabulated functions
115  static std::vector <G4double*>* J2; // Vector of pointers to the J2 tabulated functions
116  static std::vector <G4double*>* J3; // Vector of pointers to the J3 tabulated functions
117};
118
119inline G4double G4QMuonNuclearCrossSection::DFun(G4double x)// Parametrization of PhotNucCS
120{
121  static const G4double shd=1.0734;                    // HE PomShadowing(D)
122  static const G4double poc=0.0375;                    // HE Pomeron coefficient
123  static const G4double pos=16.5;                      // HE Pomeron shift
124  static const G4double reg=.11;                       // HE Reggeon slope
125  static const G4double mmu=105.65839;                 // Mass of a muon in MeV
126  static const G4double lmmu=std::log(mmu);                 // Log of a muon mass
127  G4double y=std::exp(x-lastG-lmmu);                        // y for the x
128  G4double flux=lastG*(2.-y*(2.-y))-1.;                // flux factor
129  return (poc*(x-pos)+shd*std::exp(-reg*x))*flux;
130}
131
132inline G4double G4QMuonNuclearCrossSection::Fun(G4double x) // Integrated PhoNucCS
133{
134  G4double dlg1=lastG+lastG-1.;
135  G4double lgoe=lastG/lastE;
136  G4double HE2=HighEnergyJ2(x);
137  return dlg1*HighEnergyJ1(x)-lgoe*(HE2+HE2-HighEnergyJ3(x)/lastE);
138}
139
140inline G4double G4QMuonNuclearCrossSection::HighEnergyJ1(G4double lEn)
141{
142  static const G4double le=std::log(50000.); // log(E0)
143  static const G4double le2=le*le;           // log(E0)^2
144  static const G4double a=.0375;             // a
145  static const G4double ha=a*.5;             // a/2
146  static const G4double ab=a*16.5;           // a*b
147  static const G4double d=0.11;              // d
148  static const G4double cd=1.0734/d;         // c/d
149  static const G4double ele=std::exp(-d*le); // E0^(-d)
150  return ha*(lEn*lEn-le2)-ab*(lEn-le)-cd*(std::exp(-d*lEn)-ele);
151}
152
153inline G4double G4QMuonNuclearCrossSection::HighEnergyJ2(G4double lEn)
154{
155  static const G4double e=50000.;            // E0
156  static const G4double le=std::log(e);      // log(E0)
157  static const G4double le1=(le-1.)*e;       // (log(E0)-1)*E0
158  static const G4double a=.0375;             // a
159  static const G4double ab=a*16.5;           // a*b
160  static const G4double d=1.-0.11;           // 1-d
161  static const G4double cd=1.0734/d;         // c/(1-d)
162  static const G4double ele=std::exp(d*le);  // E0^(1-d)
163  G4double En=std::exp(lEn);
164  return a*((lEn-1.)*En-le1)-ab*(En-e)+cd*(std::exp(d*lEn)-ele);
165}
166
167inline G4double G4QMuonNuclearCrossSection::HighEnergyJ3(G4double lEn)
168{
169  static const G4double e=50000.;            // E0
170  static const G4double le=std::log(e);      // log(E0)
171  static const G4double e2=e*e;              // E0^2
172  static const G4double leh=(le-.5)*e2;      // (log(E0)-.5)*E0^2
173  static const G4double ha=.0375*.5;         // a/2
174  static const G4double hab=ha*16.5;         // a*b/2
175  static const G4double d=2.-.11;            // 2-d
176  static const G4double cd=1.0734/d;         // c/(2-d)
177  static const G4double ele=std::exp(d*le);  // E0^(2-d)
178  G4double lastE2=std::exp(lEn+lEn);
179  return ha*((lEn-.5)*lastE2-leh)-hab*(lastE2-e2)+cd*(std::exp(d*lEn)-ele);
180}
181
182#endif
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