| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
>> 26 // $Id: $
26 // 27 //
27 // Author: D.H. Wright 28 // Author: D.H. Wright
28 // Date: 1 February 2011 29 // Date: 1 February 2011
29 // 30 //
30 // Modified: 31 // Modified:
31 // 32 //
32 // 19 Aug 2011, V.Ivanchenko move to new desig 33 // 19 Aug 2011, V.Ivanchenko move to new design and make x-section per element
33 34
34 // Description: use Kokoulin's parameterized c 35 // Description: use Kokoulin's parameterized calculation of virtual
35 // photon production cross sectio 36 // photon production cross section and conversion to
36 // real photons. 37 // real photons.
37 38
38 #include "G4KokoulinMuonNuclearXS.hh" 39 #include "G4KokoulinMuonNuclearXS.hh"
39 40
40 #include "G4PhysicalConstants.hh" << 41 #include "G4PhysicsTable.hh"
41 #include "G4SystemOfUnits.hh" <<
42 #include "G4PhysicsLogVector.hh" 42 #include "G4PhysicsLogVector.hh"
43 #include "G4PhysicsVector.hh" <<
44 #include "G4MuonMinus.hh" <<
45 #include "G4MuonPlus.hh" <<
46 #include "G4NucleiProperties.hh" <<
47 #include "G4NistManager.hh" <<
48 #include "G4Log.hh" <<
49 #include "G4Exp.hh" <<
50 43
51 // factory <<
52 #include "G4CrossSectionFactory.hh" <<
53 // <<
54 G4_DECLARE_XS_FACTORY(G4KokoulinMuonNuclearXS) <<
55 <<
56 G4PhysicsVector* G4KokoulinMuonNuclearXS::theC <<
57 44
58 G4KokoulinMuonNuclearXS::G4KokoulinMuonNuclear 45 G4KokoulinMuonNuclearXS::G4KokoulinMuonNuclearXS()
59 :G4VCrossSectionDataSet(Default_Name()), << 46 :G4VCrossSectionDataSet("KokoulinMuonNuclearXS"), theCrossSectionTable(0),
60 LowestKineticEnergy(1*GeV), HighestKineticEn 47 LowestKineticEnergy(1*GeV), HighestKineticEnergy(1*PeV),
61 TotBin(60), CutFixed(0.2*GeV), isInitialized << 48 TotBin(60), CutFixed(0.2*GeV)
62 {} <<
63 <<
64 G4KokoulinMuonNuclearXS::~G4KokoulinMuonNuclea <<
65 { 49 {
66 if (isMaster) { << 50 BuildCrossSectionTable();
67 for(G4int i=0; i<MAXZMUN; ++i) { <<
68 delete theCrossSection[i]; <<
69 theCrossSection[i] = 0; <<
70 } <<
71 } <<
72 } 51 }
73 52
74 << 53 G4KokoulinMuonNuclearXS::~G4KokoulinMuonNuclearXS()
75 void <<
76 G4KokoulinMuonNuclearXS::CrossSectionDescripti <<
77 { 54 {
78 outFile << "G4KokoulinMuonNuclearXS provid << 55 if (theCrossSectionTable) {
79 << "cross section for mu- and mu+ interact << 56 theCrossSectionTable->clearAndDestroy();
80 << "R. Kokoulin's approximation of the Bor << 57 delete theCrossSectionTable;
81 << "differential cross section at high ene << 58 }
82 << "over the muon energy loss to get the t <<
83 << "function of muon kinetic energy\n" ; <<
84 } 59 }
85 60
86 <<
87 G4bool 61 G4bool
88 G4KokoulinMuonNuclearXS::IsElementApplicable(c 62 G4KokoulinMuonNuclearXS::IsElementApplicable(const G4DynamicParticle*,
89 G4int, const G4Material*) 63 G4int, const G4Material*)
90 { 64 {
91 return true; 65 return true;
92 } 66 }
93 67
94 void <<
95 G4KokoulinMuonNuclearXS::BuildPhysicsTable(con <<
96 { <<
97 if(!isInitialized) { <<
98 isInitialized = true; <<
99 for(G4int i=0; i<MAXZMUN; ++i) { <<
100 if(theCrossSection[i]) { return; } <<
101 } <<
102 isMaster = true; <<
103 } <<
104 if(isMaster) { BuildCrossSectionTable(); } <<
105 } <<
106 68
107 void G4KokoulinMuonNuclearXS::BuildCrossSectio 69 void G4KokoulinMuonNuclearXS::BuildCrossSectionTable()
108 { 70 {
109 G4double energy, A, Value; << 71 G4double lowEdgeEnergy;
110 G4int Z; << 72 G4PhysicsLogVector* ptrVector;
111 73
112 std::size_t nEl = G4Element::GetNumberOfElem << 74 G4int nEl = G4Element::GetNumberOfElements();
113 const G4ElementTable* theElementTable = G4El 75 const G4ElementTable* theElementTable = G4Element::GetElementTable();
114 G4NistManager* nistManager = G4NistManager:: <<
115 76
116 for (std::size_t j = 0; j < nEl; ++j) { << 77 theCrossSectionTable = new G4PhysicsTable(nEl);
117 Z = G4lrint((*theElementTable)[j]->GetZ()) <<
118 78
119 //AR-24Apr2018 Switch to treat transuranic << 79 G4double AtomicNumber;
120 const G4bool isHeavyElementAllowed = true; << 80 G4double AtomicWeight;
121 << 81 G4double Value;
122 A = nistManager->GetAtomicMassAmu(Z); << 82
123 if(Z < MAXZMUN && !theCrossSection[Z]) { << 83 for (G4int j = 0; j < nEl; j++) {
124 theCrossSection[Z] = new G4PhysicsLogVec << 84 ptrVector = new G4PhysicsLogVector(LowestKineticEnergy,
125 HighestKineticEnergy, << 85 HighestKineticEnergy, TotBin);
126 TotBin); << 86 AtomicNumber = (*theElementTable)[j]->GetZ();
127 for (G4int i = 0; i <= TotBin; ++i) { << 87 AtomicWeight = (*theElementTable)[j]->GetA();
128 energy = theCrossSection[Z]->Energy(i); << 88
129 Value = ComputeMicroscopicCrossSection(energ << 89 for (G4int i = 0; i <= TotBin; ++i) {
130 theCrossSection[Z]->PutValue(i,Value); << 90 lowEdgeEnergy = ptrVector->Energy(i);
131 } << 91 Value = ComputeMicroscopicCrossSection(lowEdgeEnergy,
>> 92 AtomicNumber, AtomicWeight);
>> 93 ptrVector->PutValue(i,Value);
132 } 94 }
>> 95
>> 96 theCrossSectionTable->insertAt(j, ptrVector);
>> 97 }
>> 98
>> 99 // Build (Z,element) look-up table (for use in GetZandACrossSection)
>> 100 for (G4int j = 0; j < nEl; j++) {
>> 101 G4int ZZ = G4int((*theElementTable)[j]->GetZ());
>> 102 zelMap[ZZ] = j;
133 } 103 }
134 } 104 }
135 105
136 G4double G4KokoulinMuonNuclearXS:: 106 G4double G4KokoulinMuonNuclearXS::
137 ComputeMicroscopicCrossSection(G4double Kineti << 107 ComputeMicroscopicCrossSection(G4double KineticEnergy,
>> 108 G4double AtomicNumber, G4double AtomicWeight)
138 { 109 {
139 // Calculate cross section (differential in 110 // Calculate cross section (differential in muon incident kinetic energy) by
140 // integrating the double differential cross 111 // integrating the double differential cross section over the energy loss
141 112
142 static const G4double xgi[] = << 113 const G4double xgi[] = {0.0199,0.1017,0.2372,0.4083,0.5917,0.7628,0.8983,0.9801};
143 {0.0199,0.1017,0.2372,0.4083,0.5917,0.7628 << 114 const G4double wgi[] = {0.0506,0.1112,0.1569,0.1813,0.1813,0.1569,0.1112,0.0506};
144 static const G4double wgi[] = << 115 const G4double ak1 = 6.9;
145 {0.0506,0.1112,0.1569,0.1813,0.1813,0.1569 << 116 const G4double ak2 = 1.0;
146 static const G4double ak1 = 6.9; <<
147 static const G4double ak2 = 1.0; <<
148 117
149 G4double Mass = G4MuonMinus::MuonMinus()->Ge 118 G4double Mass = G4MuonMinus::MuonMinus()->GetPDGMass();
150 119
151 G4double CrossSection = 0.0; 120 G4double CrossSection = 0.0;
>> 121 if (AtomicNumber < 1.) return CrossSection;
152 if (KineticEnergy <= CutFixed) return CrossS 122 if (KineticEnergy <= CutFixed) return CrossSection;
153 123
154 G4double epmin = CutFixed; 124 G4double epmin = CutFixed;
155 G4double epmax = KineticEnergy + Mass - 0.5* 125 G4double epmax = KineticEnergy + Mass - 0.5*proton_mass_c2;
156 if (epmax <= epmin) return CrossSection; // 126 if (epmax <= epmin) return CrossSection; // NaN bug correction
157 127
158 G4double aaa = G4Log(epmin); << 128 G4double aaa = std::log(epmin) ;
159 G4double bbb = G4Log(epmax); << 129 G4double bbb = std::log(epmax) ;
160 G4int kkk = std::max(1,G4int((bbb-aaa)/ak1 + << 130 G4int kkk = G4int((bbb-aaa)/ak1 +ak2) ;
161 G4double hhh = (bbb-aaa)/kkk ; 131 G4double hhh = (bbb-aaa)/kkk ;
162 G4double epln; 132 G4double epln;
163 G4double ep; 133 G4double ep;
164 G4double x; 134 G4double x;
165 135
166 for (G4int l = 0; l < kkk; ++l) { << 136 for (G4int l = 0; l < kkk; l++) {
167 x = aaa + hhh*l; 137 x = aaa + hhh*l;
168 for (G4int ll = 0; ll < 8; ++ll) { << 138 for (G4int ll = 0; ll < 8; ll++) {
169 epln=x+xgi[ll]*hhh; 139 epln=x+xgi[ll]*hhh;
170 ep = G4Exp(epln); << 140 ep = std::exp(epln);
171 CrossSection += << 141 CrossSection += ep*wgi[ll]*ComputeDDMicroscopicCrossSection(KineticEnergy,
172 ep*wgi[ll]*ComputeDDMicroscopicCrossSection( << 142 AtomicNumber, AtomicWeight, ep);
173 } 143 }
174 } 144 }
175 145
176 CrossSection *= hhh ; 146 CrossSection *= hhh ;
177 if (CrossSection < 0.) { CrossSection = 0.; << 147 if (CrossSection < 0.) CrossSection = 0.;
178 return CrossSection; 148 return CrossSection;
179 } 149 }
180 150
181 G4double G4KokoulinMuonNuclearXS:: 151 G4double G4KokoulinMuonNuclearXS::
182 ComputeDDMicroscopicCrossSection(G4double Kine << 152 ComputeDDMicroscopicCrossSection(G4double KineticEnergy,
183 G4double A, G << 153 G4double, G4double AtomicWeight,
>> 154 G4double epsilon)
184 { 155 {
185 // Calculate the double-differential microsc 156 // Calculate the double-differential microscopic cross section (in muon
186 // incident kinetic energy and energy loss) 157 // incident kinetic energy and energy loss) using the cross section formula
187 // of R.P. Kokoulin (18/01/98) 158 // of R.P. Kokoulin (18/01/98)
188 159
189 static const G4double alam2 = 0.400*GeV*GeV; << 160 const G4double alam2 = 0.400*GeV*GeV;
190 static const G4double alam = 0.632456*GeV; << 161 const G4double alam = 0.632456*GeV;
191 static const G4double coeffn = fine_structur << 162 const G4double coeffn = fine_structure_const/pi;
192 163
193 G4double ParticleMass = G4MuonMinus::MuonMin 164 G4double ParticleMass = G4MuonMinus::MuonMinus()->GetPDGMass();
194 G4double TotalEnergy = KineticEnergy + Parti 165 G4double TotalEnergy = KineticEnergy + ParticleMass;
195 166
196 G4double DCrossSection = 0.; 167 G4double DCrossSection = 0.;
197 168
198 if ((epsilon >= TotalEnergy - 0.5*proton_mas 169 if ((epsilon >= TotalEnergy - 0.5*proton_mass_c2) ||
199 (epsilon <= CutFixed) ) { return DCrossS << 170 (epsilon <= CutFixed) ) return DCrossSection;
200 171
201 G4double ep = epsilon/GeV; 172 G4double ep = epsilon/GeV;
202 G4double aeff = 0.22*A+0.78*G4Exp(0.89*G4Log << 173 G4double a = AtomicWeight/(g/mole);
203 G4double sigph = (49.2+11.1*G4Log(ep)+151.8/ << 174 G4double aeff = 0.22*a+0.78*std::exp(0.89*std::log(a)); //shadowing
>> 175 G4double sigph = (49.2+11.1*std::log(ep)+151.8/std::sqrt(ep))*microbarn;
204 176
205 G4double v = epsilon/TotalEnergy; 177 G4double v = epsilon/TotalEnergy;
206 G4double v1 = 1.-v; 178 G4double v1 = 1.-v;
207 G4double v2 = v*v; 179 G4double v2 = v*v;
208 G4double mass2 = ParticleMass*ParticleMass; 180 G4double mass2 = ParticleMass*ParticleMass;
209 181
210 G4double up = TotalEnergy*TotalEnergy*v1/mas 182 G4double up = TotalEnergy*TotalEnergy*v1/mass2*(1.+mass2*v2/(alam2*v1));
211 G4double down = 1.+epsilon/alam*(1.+alam/(2. 183 G4double down = 1.+epsilon/alam*(1.+alam/(2.*proton_mass_c2)+epsilon/alam);
212 184
213 DCrossSection = coeffn*aeff*sigph/epsilon* 185 DCrossSection = coeffn*aeff*sigph/epsilon*
214 (-v1+(v1+0.5*v2*(1.+2.*mass2 << 186 (-v1+(v1+0.5*v2*(1.+2.*mass2/alam2))*std::log(up/down));
215 187
216 if (DCrossSection < 0.) { DCrossSection = 0. << 188 if (DCrossSection < 0.) DCrossSection = 0.;
217 return DCrossSection; 189 return DCrossSection;
218 } 190 }
219 191
220 G4double G4KokoulinMuonNuclearXS:: 192 G4double G4KokoulinMuonNuclearXS::
221 GetElementCrossSection(const G4DynamicParticle 193 GetElementCrossSection(const G4DynamicParticle* aPart,
222 G4int ZZ, const G4Material*) 194 G4int ZZ, const G4Material*)
223 { 195 {
224 //AR-24Apr2018 Switch to treat transuranic e << 196 G4int j = zelMap[ZZ];
225 G4int Z = std::min(ZZ, 92); << 197 return (*theCrossSectionTable)[j]->Value(aPart->GetKineticEnergy());
226 return theCrossSection[Z]->LogVectorValue(aP <<
227 aPart->GetLogKineticEnergy()); <<
228 } 198 }
229 199
230 200