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26 // 26 //
27 // Author: D.H. Wright 27 // Author: D.H. Wright
28 // Date: 2 February 2011 28 // Date: 2 February 2011
29 // 29 //
30 // Description: model of muon nuclear interact 30 // Description: model of muon nuclear interaction in which a gamma from
31 // the virtual photon spectrum in 31 // the virtual photon spectrum interacts in the nucleus as
32 // a real gamma at low energies a 32 // a real gamma at low energies and as a pi0 at high energies.
33 // Kokoulin's muon cross section 33 // Kokoulin's muon cross section and equivalent gamma spectrum
34 // are used. 34 // are used.
35 // 35 //
36 36
37 #include "G4MuonVDNuclearModel.hh" 37 #include "G4MuonVDNuclearModel.hh"
38 38
39 #include "Randomize.hh" 39 #include "Randomize.hh"
40 #include "G4Log.hh" 40 #include "G4Log.hh"
41 #include "G4PhysicalConstants.hh" 41 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh" 42 #include "G4SystemOfUnits.hh"
43 #include "G4CascadeInterface.hh" 43 #include "G4CascadeInterface.hh"
44 #include "G4TheoFSGenerator.hh" 44 #include "G4TheoFSGenerator.hh"
45 #include "G4GeneratorPrecompoundInterface.hh" 45 #include "G4GeneratorPrecompoundInterface.hh"
46 #include "G4PreCompoundModel.hh" 46 #include "G4PreCompoundModel.hh"
47 #include "G4LundStringFragmentation.hh" 47 #include "G4LundStringFragmentation.hh"
48 #include "G4ExcitedStringDecay.hh" 48 #include "G4ExcitedStringDecay.hh"
49 #include "G4FTFModel.hh" 49 #include "G4FTFModel.hh"
50 #include "G4HadronicInteractionRegistry.hh" 50 #include "G4HadronicInteractionRegistry.hh"
51 #include "G4KokoulinMuonNuclearXS.hh" 51 #include "G4KokoulinMuonNuclearXS.hh"
52 #include "G4CrossSectionDataSetRegistry.hh" 52 #include "G4CrossSectionDataSetRegistry.hh"
53 #include "G4ElementData.hh" 53 #include "G4ElementData.hh"
54 #include "G4Physics2DVector.hh" 54 #include "G4Physics2DVector.hh"
55 #include "G4Pow.hh" 55 #include "G4Pow.hh"
56 #include "G4PhysicsModelCatalog.hh" <<
57 56
58 const G4int G4MuonVDNuclearModel::zdat[] = {1, 57 const G4int G4MuonVDNuclearModel::zdat[] = {1, 4, 13, 29, 92};
59 const G4double G4MuonVDNuclearModel::adat[] = 58 const G4double G4MuonVDNuclearModel::adat[] = {1.01,9.01,26.98,63.55,238.03};
60 const G4double G4MuonVDNuclearModel::tdat[] = 59 const G4double G4MuonVDNuclearModel::tdat[] = {
61 1.e3,2.e3,3.e3,4.e3,5.e3,6.e3,7.e3,8.e3,9.e3 60 1.e3,2.e3,3.e3,4.e3,5.e3,6.e3,7.e3,8.e3,9.e3,
62 1.e4,2.e4,3.e4,4.e4,5.e4,6.e4,7.e4,8.e4,9.e4 61 1.e4,2.e4,3.e4,4.e4,5.e4,6.e4,7.e4,8.e4,9.e4,
63 1.e5,2.e5,3.e5,4.e5,5.e5,6.e5,7.e5,8.e5,9.e5 62 1.e5,2.e5,3.e5,4.e5,5.e5,6.e5,7.e5,8.e5,9.e5,
64 1.e6,2.e6,3.e6,4.e6,5.e6,6.e6,7.e6,8.e6,9.e6 63 1.e6,2.e6,3.e6,4.e6,5.e6,6.e6,7.e6,8.e6,9.e6,
65 1.e7,2.e7,3.e7,4.e7,5.e7,6.e7,7.e7,8.e7,9.e7 64 1.e7,2.e7,3.e7,4.e7,5.e7,6.e7,7.e7,8.e7,9.e7,
66 1.e8,2.e8,3.e8,4.e8,5.e8,6.e8,7.e8,8.e8,9.e8 65 1.e8,2.e8,3.e8,4.e8,5.e8,6.e8,7.e8,8.e8,9.e8,
67 1.e9,2.e9,3.e9,4.e9,5.e9,6.e9,7.e9,8.e9,9.e9 66 1.e9,2.e9,3.e9,4.e9,5.e9,6.e9,7.e9,8.e9,9.e9,
68 1.e10,2.e10,3.e10,4.e10,5.e10,6.e10,7.e10,8. 67 1.e10,2.e10,3.e10,4.e10,5.e10,6.e10,7.e10,8.e10,9.e10,1.e11};
69 68
70 G4ElementData* G4MuonVDNuclearModel::fElementD 69 G4ElementData* G4MuonVDNuclearModel::fElementData = nullptr;
71 70
72 G4MuonVDNuclearModel::G4MuonVDNuclearModel() 71 G4MuonVDNuclearModel::G4MuonVDNuclearModel()
73 : G4HadronicInteraction("G4MuonVDNuclearMode << 72 : G4HadronicInteraction("G4MuonVDNuclearModel"),isMaster(false)
74 { 73 {
75 muNucXS = (G4KokoulinMuonNuclearXS*)G4CrossS 74 muNucXS = (G4KokoulinMuonNuclearXS*)G4CrossSectionDataSetRegistry::Instance()->
76 GetCrossSectionDataSet(G4KokoulinMuonNucle 75 GetCrossSectionDataSet(G4KokoulinMuonNuclearXS::Default_Name());
77 76
78 SetMinEnergy(0.0); 77 SetMinEnergy(0.0);
79 SetMaxEnergy(1*CLHEP::PeV); 78 SetMaxEnergy(1*CLHEP::PeV);
80 CutFixed = 0.2*CLHEP::GeV; 79 CutFixed = 0.2*CLHEP::GeV;
81 80
82 if (nullptr == fElementData) { << 81 if(!fElementData && G4Threading::IsMasterThread()) {
83 fElementData = new G4ElementData(93); << 82 fElementData = new G4ElementData();
84 MakeSamplingTable(); << 83 MakeSamplingTable();
>> 84 isMaster = true;
85 } 85 }
86 86
87 // reuse existing pre-compound model 87 // reuse existing pre-compound model
88 G4GeneratorPrecompoundInterface* precoInterf 88 G4GeneratorPrecompoundInterface* precoInterface
89 = new G4GeneratorPrecompoundInterface(); 89 = new G4GeneratorPrecompoundInterface();
90 G4HadronicInteraction* p = 90 G4HadronicInteraction* p =
91 G4HadronicInteractionRegistry::Instance()- 91 G4HadronicInteractionRegistry::Instance()->FindModel("PRECO");
92 G4VPreCompoundModel* pre = static_cast<G4VPr 92 G4VPreCompoundModel* pre = static_cast<G4VPreCompoundModel*>(p);
93 if(nullptr == pre) { pre = new G4PreCompound << 93 if(!pre) { pre = new G4PreCompoundModel(); }
94 precoInterface->SetDeExcitation(pre); 94 precoInterface->SetDeExcitation(pre);
95 95
96 // Build FTFP model 96 // Build FTFP model
97 ftfp = new G4TheoFSGenerator(); 97 ftfp = new G4TheoFSGenerator();
98 ftfp->SetTransport(precoInterface); 98 ftfp->SetTransport(precoInterface);
99 theFragmentation = new G4LundStringFragmenta 99 theFragmentation = new G4LundStringFragmentation();
100 theStringDecay = new G4ExcitedStringDecay(th 100 theStringDecay = new G4ExcitedStringDecay(theFragmentation);
101 G4FTFModel* theStringModel = new G4FTFModel; 101 G4FTFModel* theStringModel = new G4FTFModel;
102 theStringModel->SetFragmentationModel(theStr 102 theStringModel->SetFragmentationModel(theStringDecay);
103 ftfp->SetHighEnergyGenerator(theStringModel) 103 ftfp->SetHighEnergyGenerator(theStringModel);
104 104
105 // Build Bertini cascade 105 // Build Bertini cascade
106 bert = new G4CascadeInterface(); 106 bert = new G4CascadeInterface();
107 <<
108 // Creator model ID <<
109 secID = G4PhysicsModelCatalog::GetModelID( " <<
110 } 107 }
111 108
112 G4MuonVDNuclearModel::~G4MuonVDNuclearModel() 109 G4MuonVDNuclearModel::~G4MuonVDNuclearModel()
113 { 110 {
114 delete theFragmentation; 111 delete theFragmentation;
115 delete theStringDecay; 112 delete theStringDecay;
>> 113
>> 114 if(isMaster) {
>> 115 delete fElementData;
>> 116 fElementData = nullptr;
>> 117 }
116 } 118 }
117 119
118 G4HadFinalState* 120 G4HadFinalState*
119 G4MuonVDNuclearModel::ApplyYourself(const G4Ha 121 G4MuonVDNuclearModel::ApplyYourself(const G4HadProjectile& aTrack,
120 G4Nucleus& 122 G4Nucleus& targetNucleus)
121 { 123 {
122 theParticleChange.Clear(); 124 theParticleChange.Clear();
123 125
124 // For very low energy, return initial track 126 // For very low energy, return initial track
125 G4double epmax = aTrack.GetTotalEnergy() - 0 127 G4double epmax = aTrack.GetTotalEnergy() - 0.5*proton_mass_c2;
126 if (epmax <= CutFixed) { 128 if (epmax <= CutFixed) {
127 theParticleChange.SetStatusChange(isAlive) 129 theParticleChange.SetStatusChange(isAlive);
128 theParticleChange.SetEnergyChange(aTrack.G 130 theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy());
129 theParticleChange.SetMomentumChange(aTrack 131 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
130 return &theParticleChange; 132 return &theParticleChange;
131 } 133 }
132 134
133 // Produce recoil muon and transferred photo 135 // Produce recoil muon and transferred photon
134 G4DynamicParticle* transferredPhoton = Calcu 136 G4DynamicParticle* transferredPhoton = CalculateEMVertex(aTrack, targetNucleus);
135 137
136 // Interact the gamma with the nucleus 138 // Interact the gamma with the nucleus
137 CalculateHadronicVertex(transferredPhoton, t 139 CalculateHadronicVertex(transferredPhoton, targetNucleus);
138 return &theParticleChange; 140 return &theParticleChange;
139 } 141 }
140 142
141 G4DynamicParticle* 143 G4DynamicParticle*
142 G4MuonVDNuclearModel::CalculateEMVertex(const 144 G4MuonVDNuclearModel::CalculateEMVertex(const G4HadProjectile& aTrack,
143 G4Nucl 145 G4Nucleus& targetNucleus)
144 { 146 {
145 // Select sampling table 147 // Select sampling table
146 G4double KineticEnergy = aTrack.GetKineticEn 148 G4double KineticEnergy = aTrack.GetKineticEnergy();
147 G4double TotalEnergy = aTrack.GetTotalEnergy 149 G4double TotalEnergy = aTrack.GetTotalEnergy();
148 G4double Mass = G4MuonMinus::MuonMinus()->Ge 150 G4double Mass = G4MuonMinus::MuonMinus()->GetPDGMass();
149 G4Pow* g4calc = G4Pow::GetInstance(); 151 G4Pow* g4calc = G4Pow::GetInstance();
150 G4double lnZ = g4calc->logZ(targetNucleus.Ge 152 G4double lnZ = g4calc->logZ(targetNucleus.GetZ_asInt());
151 153
152 G4double epmin = CutFixed; 154 G4double epmin = CutFixed;
153 G4double epmax = TotalEnergy - 0.5*proton_ma 155 G4double epmax = TotalEnergy - 0.5*proton_mass_c2;
154 G4double m0 = CutFixed; 156 G4double m0 = CutFixed;
155 157
156 G4double delmin = 1.e10; 158 G4double delmin = 1.e10;
157 G4double del; 159 G4double del;
158 G4int izz = 0; 160 G4int izz = 0;
159 G4int itt = 0; 161 G4int itt = 0;
160 162
161 for (G4int iz = 0; iz < nzdat; ++iz) { 163 for (G4int iz = 0; iz < nzdat; ++iz) {
162 del = std::abs(lnZ - g4calc->logZ(zdat[iz] 164 del = std::abs(lnZ - g4calc->logZ(zdat[iz]));
163 if (del < delmin) { 165 if (del < delmin) {
164 delmin = del; 166 delmin = del;
165 izz = iz; 167 izz = iz;
166 } 168 }
167 } 169 }
168 170
169 delmin = 1.e10; 171 delmin = 1.e10;
170 for (G4int it = 0; it < ntdat; ++it) { 172 for (G4int it = 0; it < ntdat; ++it) {
171 del = std::abs(G4Log(KineticEnergy)-G4Log( 173 del = std::abs(G4Log(KineticEnergy)-G4Log(tdat[it]) );
172 if (del < delmin) { 174 if (del < delmin) {
173 delmin = del; 175 delmin = del;
174 itt = it; 176 itt = it;
175 } 177 }
176 } 178 }
177 179
178 // Sample the energy transfer according to t 180 // Sample the energy transfer according to the probability table
179 G4double r = G4UniformRand(); 181 G4double r = G4UniformRand();
180 182
181 G4int iy; 183 G4int iy;
182 184
183 G4int Z = zdat[izz]; 185 G4int Z = zdat[izz];
184 186
185 for(iy = 0; iy<NBIN; ++iy) { 187 for(iy = 0; iy<NBIN; ++iy) {
186 188
187 G4double pvv = fElementData->GetElement2DD 189 G4double pvv = fElementData->GetElement2DData(Z)->GetValue(iy, itt);
188 if(pvv >= r) { break; } 190 if(pvv >= r) { break; }
189 } 191 }
190 192
191 // Sampling is done uniformly in y in the bi 193 // Sampling is done uniformly in y in the bin
192 G4double pvx = fElementData->GetElement2DDat 194 G4double pvx = fElementData->GetElement2DData(Z)->GetX(iy);
193 G4double pvx1 = fElementData->GetElement2DDa 195 G4double pvx1 = fElementData->GetElement2DData(Z)->GetX(iy+1);
194 G4double y = pvx + G4UniformRand() * (pvx1 - 196 G4double y = pvx + G4UniformRand() * (pvx1 - pvx);
195 197
196 G4double x = G4Exp(y); 198 G4double x = G4Exp(y);
197 G4double ep = epmin*G4Exp(x*G4Log(epmax/epmi 199 G4double ep = epmin*G4Exp(x*G4Log(epmax/epmin) );
198 200
199 // Sample scattering angle of mu, but first 201 // Sample scattering angle of mu, but first t should be sampled.
200 G4double yy = ep/TotalEnergy; 202 G4double yy = ep/TotalEnergy;
201 G4double tmin = Mass*Mass*yy*yy/(1.-yy); 203 G4double tmin = Mass*Mass*yy*yy/(1.-yy);
202 G4double tmax = 2.*proton_mass_c2*ep; 204 G4double tmax = 2.*proton_mass_c2*ep;
203 G4double t1; 205 G4double t1;
204 G4double t2; 206 G4double t2;
205 if (m0 < ep) { 207 if (m0 < ep) {
206 t1 = m0*m0; 208 t1 = m0*m0;
207 t2 = ep*ep; 209 t2 = ep*ep;
208 } else { 210 } else {
209 t1 = ep*ep; 211 t1 = ep*ep;
210 t2 = m0*m0; 212 t2 = m0*m0;
211 } 213 }
212 214
213 G4double w1 = tmax*t1; 215 G4double w1 = tmax*t1;
214 G4double w2 = tmax+t1; 216 G4double w2 = tmax+t1;
215 G4double w3 = tmax*(tmin+t1)/(tmin*w2); 217 G4double w3 = tmax*(tmin+t1)/(tmin*w2);
216 G4double y1 = 1.-yy; 218 G4double y1 = 1.-yy;
217 G4double y2 = 0.5*yy*yy; 219 G4double y2 = 0.5*yy*yy;
218 G4double y3 = y1+y2; 220 G4double y3 = y1+y2;
219 221
220 G4double t = 0.0; << 222 G4double t;
221 G4double rej = 0.0; << 223 G4double rej;
222 224
223 // Now sample t 225 // Now sample t
224 G4int ntry = 0; 226 G4int ntry = 0;
225 do 227 do
226 { 228 {
227 ntry += 1; 229 ntry += 1;
228 if (ntry > 10000) { 230 if (ntry > 10000) {
229 G4ExceptionDescription eda; 231 G4ExceptionDescription eda;
230 eda << " While count exceeded " << G4end 232 eda << " While count exceeded " << G4endl;
231 G4Exception("G4MuonVDNuclearModel::Calcu 233 G4Exception("G4MuonVDNuclearModel::CalculateEMVertex()", "HAD_RPG_100", JustWarning, eda);
232 break; 234 break;
233 } 235 }
234 236
235 t = w1/(w2*G4Exp(G4UniformRand()*G4Log(w3) 237 t = w1/(w2*G4Exp(G4UniformRand()*G4Log(w3))-tmax);
236 rej = (1.-t/tmax)*(y1*(1.-tmin/t)+y2)/(y3* 238 rej = (1.-t/tmax)*(y1*(1.-tmin/t)+y2)/(y3*(1.-t/t2));
237 } while (G4UniformRand() > rej) ; /* Loop 239 } while (G4UniformRand() > rej) ; /* Loop checking, 01.09.2015, D.Wright */
238 240
239 // compute angle from t 241 // compute angle from t
240 G4double sinth2 = 242 G4double sinth2 =
241 0.5*(t-tmin)/(2.*(TotalEnergy*(To 243 0.5*(t-tmin)/(2.*(TotalEnergy*(TotalEnergy-ep)-Mass*Mass)-tmin);
242 G4double theta = std::acos(1. - 2.*sinth2); 244 G4double theta = std::acos(1. - 2.*sinth2);
243 245
244 G4double phi = twopi*G4UniformRand(); 246 G4double phi = twopi*G4UniformRand();
245 G4double sinth = std::sin(theta); 247 G4double sinth = std::sin(theta);
246 G4double dirx = sinth*std::cos(phi); 248 G4double dirx = sinth*std::cos(phi);
247 G4double diry = sinth*std::sin(phi); 249 G4double diry = sinth*std::sin(phi);
248 G4double dirz = std::cos(theta); 250 G4double dirz = std::cos(theta);
249 G4ThreeVector finalDirection(dirx,diry,dirz) 251 G4ThreeVector finalDirection(dirx,diry,dirz);
250 G4ThreeVector ParticleDirection(aTrack.Get4M 252 G4ThreeVector ParticleDirection(aTrack.Get4Momentum().vect().unit() );
251 finalDirection.rotateUz(ParticleDirection); 253 finalDirection.rotateUz(ParticleDirection);
252 254
253 G4double NewKinEnergy = KineticEnergy - ep; 255 G4double NewKinEnergy = KineticEnergy - ep;
254 G4double finalMomentum = std::sqrt(NewKinEne 256 G4double finalMomentum = std::sqrt(NewKinEnergy*(NewKinEnergy+2.*Mass) );
255 G4double Ef = NewKinEnergy + Mass; 257 G4double Ef = NewKinEnergy + Mass;
256 G4double initMomentum = std::sqrt(KineticEne 258 G4double initMomentum = std::sqrt(KineticEnergy*(TotalEnergy+Mass) );
257 259
258 // Set energy and direction of scattered pri 260 // Set energy and direction of scattered primary in theParticleChange
259 theParticleChange.SetStatusChange(isAlive); 261 theParticleChange.SetStatusChange(isAlive);
260 theParticleChange.SetEnergyChange(NewKinEner 262 theParticleChange.SetEnergyChange(NewKinEnergy);
261 theParticleChange.SetMomentumChange(finalDir 263 theParticleChange.SetMomentumChange(finalDirection);
262 264
263 // Now create the emitted gamma 265 // Now create the emitted gamma
264 G4LorentzVector primaryMomentum(initMomentum 266 G4LorentzVector primaryMomentum(initMomentum*ParticleDirection, TotalEnergy);
265 G4LorentzVector fsMomentum(finalMomentum*fin 267 G4LorentzVector fsMomentum(finalMomentum*finalDirection, Ef);
266 G4LorentzVector momentumTransfer = primaryMo 268 G4LorentzVector momentumTransfer = primaryMomentum - fsMomentum;
267 269
268 G4DynamicParticle* gamma = 270 G4DynamicParticle* gamma =
269 new G4DynamicParticle(G4Gamma::Gamm 271 new G4DynamicParticle(G4Gamma::Gamma(), momentumTransfer);
270 272
271 return gamma; 273 return gamma;
272 } 274 }
273 275
274 void 276 void
275 G4MuonVDNuclearModel::CalculateHadronicVertex( 277 G4MuonVDNuclearModel::CalculateHadronicVertex(G4DynamicParticle* incident,
276 278 G4Nucleus& target)
277 { 279 {
278 G4HadFinalState* hfs = 0; 280 G4HadFinalState* hfs = 0;
279 G4double gammaE = incident->GetTotalEnergy() 281 G4double gammaE = incident->GetTotalEnergy();
280 282
281 if (gammaE < 10*GeV) { 283 if (gammaE < 10*GeV) {
282 G4HadProjectile projectile(*incident); 284 G4HadProjectile projectile(*incident);
283 hfs = bert->ApplyYourself(projectile, targ 285 hfs = bert->ApplyYourself(projectile, target);
284 } else { 286 } else {
285 // convert incident gamma to a pi0 287 // convert incident gamma to a pi0
286 G4double piMass = G4PionZero::PionZero()-> 288 G4double piMass = G4PionZero::PionZero()->GetPDGMass();
287 G4double piKE = incident->GetTotalEnergy() 289 G4double piKE = incident->GetTotalEnergy() - piMass;
288 G4double piMom = std::sqrt(piKE*(piKE + 2* 290 G4double piMom = std::sqrt(piKE*(piKE + 2*piMass) );
289 G4ThreeVector piMomentum(incident->GetMome 291 G4ThreeVector piMomentum(incident->GetMomentumDirection() );
290 piMomentum *= piMom; 292 piMomentum *= piMom;
291 G4DynamicParticle theHadron(G4PionZero::Pi 293 G4DynamicParticle theHadron(G4PionZero::PionZero(), piMomentum);
292 G4HadProjectile projectile(theHadron); 294 G4HadProjectile projectile(theHadron);
293 hfs = ftfp->ApplyYourself(projectile, targ 295 hfs = ftfp->ApplyYourself(projectile, target);
294 } 296 }
295 297
296 delete incident; 298 delete incident;
297 299
298 // Assign the creator model ID to the second <<
299 for ( size_t i = 0; i < hfs->GetNumberOfSeco <<
300 hfs->GetSecondary( i )->SetCreatorModelID( <<
301 } <<
302 <<
303 // Copy secondaries from sub-model to model 300 // Copy secondaries from sub-model to model
304 theParticleChange.AddSecondaries(hfs); 301 theParticleChange.AddSecondaries(hfs);
305 } 302 }
306 303
307 304
308 void G4MuonVDNuclearModel::MakeSamplingTable() 305 void G4MuonVDNuclearModel::MakeSamplingTable()
309 { 306 {
310 G4int nbin; 307 G4int nbin;
311 G4double KineticEnergy; 308 G4double KineticEnergy;
312 G4double TotalEnergy; 309 G4double TotalEnergy;
313 G4double Maxep; 310 G4double Maxep;
314 G4double CrossSection; 311 G4double CrossSection;
315 312
316 G4double c; 313 G4double c;
317 G4double y; 314 G4double y;
318 G4double ymin,ymax; 315 G4double ymin,ymax;
319 G4double dy,yy; 316 G4double dy,yy;
320 G4double dx,x; 317 G4double dx,x;
321 G4double ep; 318 G4double ep;
322 319
323 G4double AtomicNumber; 320 G4double AtomicNumber;
324 G4double AtomicWeight; 321 G4double AtomicWeight;
325 322
326 G4double mumass = G4MuonMinus::MuonMinus()-> 323 G4double mumass = G4MuonMinus::MuonMinus()->GetPDGMass();
327 324
328 for (G4int iz = 0; iz < nzdat; ++iz) { 325 for (G4int iz = 0; iz < nzdat; ++iz) {
329 AtomicNumber = zdat[iz]; 326 AtomicNumber = zdat[iz];
330 AtomicWeight = adat[iz]*(g/mole); 327 AtomicWeight = adat[iz]*(g/mole);
331 328
332 G4Physics2DVector* pv = new G4Physics2DVec 329 G4Physics2DVector* pv = new G4Physics2DVector(NBIN+1,ntdat+1);
333 G4double pvv; 330 G4double pvv;
334 331
335 for (G4int it = 0; it < ntdat; ++it) { 332 for (G4int it = 0; it < ntdat; ++it) {
336 KineticEnergy = tdat[it]; 333 KineticEnergy = tdat[it];
337 TotalEnergy = KineticEnergy + mumass; 334 TotalEnergy = KineticEnergy + mumass;
338 Maxep = TotalEnergy - 0.5*proton_mass_c2 335 Maxep = TotalEnergy - 0.5*proton_mass_c2;
339 336
340 CrossSection = 0.0; 337 CrossSection = 0.0;
341 338
342 // Calculate the differential cross sect 339 // Calculate the differential cross section
343 // numerical integration in log ........ 340 // numerical integration in log .........
344 c = G4Log(Maxep/CutFixed); 341 c = G4Log(Maxep/CutFixed);
345 ymin = -5.0; 342 ymin = -5.0;
346 ymax = 0.0; 343 ymax = 0.0;
347 dy = (ymax-ymin)/NBIN; 344 dy = (ymax-ymin)/NBIN;
348 345
349 nbin=-1; 346 nbin=-1;
350 347
351 y = ymin - 0.5*dy; 348 y = ymin - 0.5*dy;
352 yy = ymin - dy; 349 yy = ymin - dy;
353 for (G4int i = 0; i < NBIN; ++i) { 350 for (G4int i = 0; i < NBIN; ++i) {
354 y += dy; 351 y += dy;
355 x = G4Exp(y); 352 x = G4Exp(y);
356 yy += dy; 353 yy += dy;
357 dx = G4Exp(yy+dy)-G4Exp(yy); 354 dx = G4Exp(yy+dy)-G4Exp(yy);
358 355
359 ep = CutFixed*G4Exp(c*x); 356 ep = CutFixed*G4Exp(c*x);
360 357
361 CrossSection += 358 CrossSection +=
362 ep*dx*muNucXS->ComputeDDMicroscopic 359 ep*dx*muNucXS->ComputeDDMicroscopicCrossSection(KineticEnergy,
363 AtomicNumber, 360 AtomicNumber,
364 AtomicWeight, ep); 361 AtomicWeight, ep);
365 if (nbin < NBIN) { 362 if (nbin < NBIN) {
366 ++nbin; 363 ++nbin;
367 pv->PutValue(nbin, it, CrossSection) 364 pv->PutValue(nbin, it, CrossSection);
368 pv->PutX(nbin, y); 365 pv->PutX(nbin, y);
369 } 366 }
370 } 367 }
371 pv->PutX(NBIN, 0.); 368 pv->PutX(NBIN, 0.);
372 369
373 if (CrossSection > 0.0) { 370 if (CrossSection > 0.0) {
374 for (G4int ib = 0; ib <= nbin; ++ib) { 371 for (G4int ib = 0; ib <= nbin; ++ib) {
375 pvv = pv->GetValue(ib, it); 372 pvv = pv->GetValue(ib, it);
376 pvv = pvv/CrossSection; 373 pvv = pvv/CrossSection;
377 pv->PutValue(ib, it, pvv); 374 pv->PutValue(ib, it, pvv);
378 } 375 }
379 } 376 }
380 } // loop on it 377 } // loop on it
381 378
382 fElementData->InitialiseForElement(zdat[iz 379 fElementData->InitialiseForElement(zdat[iz], pv);
383 } // loop on iz 380 } // loop on iz
384 381
385 // G4cout << " Kokoulin XS = " 382 // G4cout << " Kokoulin XS = "
386 // << muNucXS->ComputeDDMicroscopicCro 383 // << muNucXS->ComputeDDMicroscopicCrossSection(1*GeV, 20.0,
387 // 40.0*g/mole, 0.3*GeV)/millibarn 384 // 40.0*g/mole, 0.3*GeV)/millibarn
388 // << G4endl; 385 // << G4endl;
389 } 386 }
390 387
391 void G4MuonVDNuclearModel::ModelDescription(st 388 void G4MuonVDNuclearModel::ModelDescription(std::ostream& outFile) const
392 { 389 {
393 outFile << "G4MuonVDNuclearModel handles the 390 outFile << "G4MuonVDNuclearModel handles the inelastic scattering\n"
394 << "of mu- and mu+ from nuclei using 391 << "of mu- and mu+ from nuclei using the equivalent photon\n"
395 << "approximation in which the incom 392 << "approximation in which the incoming lepton generates a\n"
396 << "virtual photon at the electromag 393 << "virtual photon at the electromagnetic vertex, and the\n"
397 << "virtual photon is converted to a 394 << "virtual photon is converted to a real photon. At low\n"
398 << "energies, the photon interacts d 395 << "energies, the photon interacts directly with the nucleus\n"
399 << "using the Bertini cascade. At h 396 << "using the Bertini cascade. At high energies the photon\n"
400 << "is converted to a pi0 which inte 397 << "is converted to a pi0 which interacts using the FTFP\n"
401 << "model. The muon-nuclear cross s 398 << "model. The muon-nuclear cross sections of R. Kokoulin \n"
402 << "are used to generate the virtual 399 << "are used to generate the virtual photon spectrum\n";
403 } 400 }
404 401
405 402