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25 //
26 //
27 // -------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 // File name: G4GSMottCorrection
32 //
33 // Author: Mihaly Novak
34 //
35 // Creation date: 23.08.2017
36 //
37 // Modifications:
38 //
39 // Class description:
40 // An object of this calss is used in the G4
41 // was required by the user in the G4Goudsmi
42 // The class is responsible to handle pre-co
43 // obtained as a ratio of GS angular distrib
44 // DCS to GS angular distributions computed
45 // The DCS used to compute the accurate Goud
46 // DCS_{cor} = DCS_{SR}x[ DCS_{R}/DCS_{Mott}
47 // # DCS_{SR} is the relativistic Screened-
48 // solution of the Klein-Gordon i.e. rela
49 // scattering of spinless e- on exponenti
50 // note: the default (without using Mott-
51 // are based on this DCS_{SR} with Molier
52 // # DCS_{R} is the Rutherford DCS which is
53 // screening
54 // # DCS_{Mott} is the Mott DCS i.e. soluti
55 // Coulomb potential i.e. scattering of p
56 // point-like unscreened Coulomb potentia
57 // # moreover, the screening parameter of t
58 // the DCS_{cor} with this corrected screenin
59 // transport cross sections obtained from the
60 // Unlike the default GS, the Mott-corrected
61 // (different for e- and e+ <= the DCS_{Mott}
62 // (Z and material) dependent.
63 //
64 // References:
65 // [2] I.Kawrakow, E.Mainegra-Hing, D.W.O.Ro
66 // Report PIRS-701 (2013)
67 // [2] N.F. Mott, Proc. Roy. Soc. (London)
68 // [3] F.Salvat, A.Jablonski, C.J. Powell, C
69 //
70 // -------------------------------------------
71
72 #ifndef G4GSMottCorrection_h
73 #define G4GSMottCorrection_h 1
74
75 #include <CLHEP/Units/SystemOfUnits.h>
76
77 #include "globals.hh"
78
79 #include <vector>
80 #include <string>
81 #include <sstream>
82
83 class G4Material;
84 class G4Element;
85
86
87 class G4GSMottCorrection {
88 public:
89 G4GSMottCorrection(G4bool iselectron=true);
90
91 ~G4GSMottCorrection();
92
93 void Initialise();
94
95 void GetMottCorrectionFactors(G4double l
96 G4double &
97
98 G4double GetMottRejectionValue(G4double loge
99 G4int matindx
100
101 static G4int GetMaxZet() { return gMaxZet; }
102
103 private:
104 void InitMCDataPerElement();
105
106 void InitMCDataPerMaterials();
107
108 void LoadMCDataElement(const G4Element*);
109
110 void ReadCompressedFile(const std::string& f
111
112 void InitMCDataMaterial(const G4Material*);
113 //
114 // dat structures
115 struct DataPerDelta {
116 G4double fSA; // a,b,c
117 G4double fSB;
118 G4double fSC;
119 G4double fSD;
120 G4double *fRejFuntion; // rejec
121 };
122
123 struct DataPerEkin {
124 G4double fMCScreening; // corre
125 G4double fMCFirstMoment; // corre
126 G4double fMCSecondMoment; // corre
127 DataPerDelta **fDataPerDelta; // per d
128 };
129
130 // either per material or per Z
131 struct DataPerMaterial {
132 DataPerEkin **fDataPerEkin; // per kin
133 };
134 //
135 void AllocateDataPerMaterial(DataPerMaterial
136 void DeAllocateDataPerMaterial(DataPerMateri
137 void ClearMCDataPerElement();
138 void ClearMCDataPerMaterial();
139 //
140 // data members:
141 // - Mott correction data are computed over
142 // I. Kinetic energy grid [both rejection
143 // 1. kinetic energy grid from 1[keV] -
144 // # linear interpolation on
145 // 2. \beta^2 grid from E_{kin} = 100[k
146 // # linear interpolation on
147 // 3. the overall kinetic energy grid i
148 // II. Delta value grid [rejection function
149 // 1. \delta=2 Q_{1SR} (\eta_{MCcor})/
150 // Q_{1SR}(\eta_{MCcor}) =s/\lambda_
151 // scattering along the path s and G
152 // but computed by using the Mott-co
153 // 2. the delta value grid is from [0(1
154 // # linear interpolation wi
155 // III. \sin(0.5\theta) grid[rejection funct
156 // 1. 32 \sin(0.5\theta) pints between
157 // be used exept the last bin where
158 private:
159 G4bool fIsElectron;
160 static constexpr G4int gNumEkin = 31;
161 static constexpr G4int gNumBeta2 = 16;
162 static constexpr G4int gNumDelta = 28;
163 static constexpr G4int gNumAngle = 32;
164 static constexpr G4int gMaxZet = 98;
165 static constexpr G4double gMinEkin = 1.
166 static constexpr G4double gMidEkin = 100.
167 static constexpr G4double gMaxBeta2 = 0.
168 static constexpr G4double gMaxDelta = 0.
169 //
170 G4double fMaxEkin;
171 G4double fLogMinEkin;
172 G4double fInvLogDelEkin;
173 G4double fMinBeta2;
174 G4double fInvDelBeta2;
175 G4double fInvDelDelta;
176 G4double fInvDelAngle;
177 //
178 static const std::string gElemSymbols[];
179 //
180 std::vector<DataPerMaterial*> fMCDataPerEle
181 std::vector<DataPerMaterial*> fMCDataPerMat
182 };
183
184 #endif // G4GSMottCorrection_h
185