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25 // 25 //
>> 26 //
>> 27 // $Id: G4PolarizedCompton.cc 93113 2015-10-07 07:49:04Z gcosmo $
>> 28 //
>> 29 //
26 // File name: G4PolarizedCompton 30 // File name: G4PolarizedCompton
27 // 31 //
28 // Author: Andreas Schaelicke 32 // Author: Andreas Schaelicke
29 // based on code by Michel Mair 33 // based on code by Michel Maire / Vladimir IVANTCHENKO
30 // <<
31 // Class description 34 // Class description
32 // modified version respecting media and bea << 35 //
33 // using the stokes formalism << 36 // modified version respecting media and beam polarization
>> 37 // using the stokes formalism
>> 38 //
>> 39 // Creation date: 01.05.2005
>> 40 //
>> 41 // Modifications:
>> 42 //
>> 43 // 01-01-05, include polarization description (A.Stahl)
>> 44 // 01-01-05, create asymmetry table and determine interactionlength (A.Stahl)
>> 45 // 01-05-05, update handling of media polarization (A.Schalicke)
>> 46 // 01-05-05, update polarized differential cross section (A.Schalicke)
>> 47 // 20-05-05, added polarization transfer (A.Schalicke)
>> 48 // 10-06-05, transformation between different reference frames (A.Schalicke)
>> 49 // 17-10-05, correct reference frame dependence in GetMeanFreePath (A.Schalicke)
>> 50 // 26-07-06, cross section recalculated (P.Starovoitov)
>> 51 // 09-08-06, make it work under current geant4 release (A.Schalicke)
>> 52 // 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke)
>> 53 // -----------------------------------------------------------------------------
34 54
35 #include "G4PolarizedCompton.hh" <<
36 55
>> 56 #include "G4PolarizedCompton.hh"
>> 57 #include "G4SystemOfUnits.hh"
37 #include "G4Electron.hh" 58 #include "G4Electron.hh"
38 #include "G4EmParameters.hh" << 59
39 #include "G4KleinNishinaCompton.hh" << 60 #include "G4StokesVector.hh"
40 #include "G4PhysicsTableHelper.hh" <<
41 #include "G4PolarizationManager.hh" 61 #include "G4PolarizationManager.hh"
42 #include "G4PolarizedComptonModel.hh" 62 #include "G4PolarizedComptonModel.hh"
43 #include "G4ProductionCutsTable.hh" 63 #include "G4ProductionCutsTable.hh"
44 #include "G4StokesVector.hh" << 64 #include "G4PhysicsTableHelper.hh"
45 #include "G4SystemOfUnits.hh" << 65 #include "G4KleinNishinaCompton.hh"
>> 66 #include "G4PolarizedComptonModel.hh"
>> 67 #include "G4EmParameters.hh"
46 68
47 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 70
48 G4PhysicsTable* G4PolarizedCompton::theAsymmet 71 G4PhysicsTable* G4PolarizedCompton::theAsymmetryTable = nullptr;
49 72
50 G4PolarizedCompton::G4PolarizedCompton(const G 73 G4PolarizedCompton::G4PolarizedCompton(const G4String& processName,
51 G4Proce << 74 G4ProcessType type):
52 : G4VEmProcess(processName, type) << 75 G4VEmProcess (processName, type),
53 , fType(10) << 76 buildAsymmetryTable(true),
54 , fBuildAsymmetryTable(true) << 77 useAsymmetryTable(true),
55 , fUseAsymmetryTable(true) << 78 isInitialised(false),
56 , fIsInitialised(false) << 79 mType(10),
>> 80 targetPolarization(0.0,0.0,0.0)
57 { 81 {
58 SetStartFromNullFlag(true); 82 SetStartFromNullFlag(true);
59 SetBuildTableFlag(true); 83 SetBuildTableFlag(true);
60 SetSecondaryParticle(G4Electron::Electron()) 84 SetSecondaryParticle(G4Electron::Electron());
61 SetProcessSubType(fComptonScattering); 85 SetProcessSubType(fComptonScattering);
62 SetMinKinEnergyPrim(1. * MeV); << 86 SetMinKinEnergyPrim(1*MeV);
63 SetSplineFlag(true); 87 SetSplineFlag(true);
64 fEmModel = nullptr; << 88 emModel = nullptr;
65 } 89 }
66 90
67 //....oooOO0OOooo........oooOO0OOooo........oo 91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
68 G4PolarizedCompton::~G4PolarizedCompton() { Cl << 92
69 << 93 G4PolarizedCompton::~G4PolarizedCompton()
70 //....oooOO0OOooo........oooOO0OOooo........oo <<
71 void G4PolarizedCompton::ProcessDescription(st <<
72 { 94 {
73 out << "Polarized model for Compton scatteri << 95 CleanTable();
74 <<
75 G4VEmProcess::ProcessDescription(out); <<
76 } 96 }
77 97
78 //....oooOO0OOooo........oooOO0OOooo........oo 98 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 99
79 void G4PolarizedCompton::CleanTable() 100 void G4PolarizedCompton::CleanTable()
80 { 101 {
81 if(theAsymmetryTable) << 102 if( theAsymmetryTable) {
82 { <<
83 theAsymmetryTable->clearAndDestroy(); 103 theAsymmetryTable->clearAndDestroy();
84 delete theAsymmetryTable; 104 delete theAsymmetryTable;
85 theAsymmetryTable = nullptr; 105 theAsymmetryTable = nullptr;
86 } 106 }
87 } 107 }
88 108
89 //....oooOO0OOooo........oooOO0OOooo........oo 109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 110
90 G4bool G4PolarizedCompton::IsApplicable(const 111 G4bool G4PolarizedCompton::IsApplicable(const G4ParticleDefinition& p)
91 { 112 {
92 return (&p == G4Gamma::Gamma()); 113 return (&p == G4Gamma::Gamma());
93 } 114 }
94 115
95 //....oooOO0OOooo........oooOO0OOooo........oo 116 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 117
96 void G4PolarizedCompton::InitialiseProcess(con 118 void G4PolarizedCompton::InitialiseProcess(const G4ParticleDefinition*)
97 { 119 {
98 if(!fIsInitialised) << 120 if(!isInitialised) {
99 { << 121 isInitialised = true;
100 fIsInitialised = true; << 122 if(0 == mType) {
101 if(0 == fType) << 123 if(!EmModel(1)) { SetEmModel(new G4KleinNishinaCompton(), 1); }
102 { << 124 } else {
103 if(nullptr == EmModel(0)) << 125 emModel = new G4PolarizedComptonModel();
104 { << 126 SetEmModel(emModel, 1);
105 SetEmModel(new G4KleinNishinaCompton() <<
106 } <<
107 } <<
108 else <<
109 { <<
110 fEmModel = new G4PolarizedComptonModel() <<
111 SetEmModel(fEmModel); <<
112 } 127 }
113 G4EmParameters* param = G4EmParameters::In 128 G4EmParameters* param = G4EmParameters::Instance();
114 EmModel(0)->SetLowEnergyLimit(param->MinKi << 129 EmModel(1)->SetLowEnergyLimit(param->MinKinEnergy());
115 EmModel(0)->SetHighEnergyLimit(param->MaxK << 130 EmModel(1)->SetHighEnergyLimit(param->MaxKinEnergy());
116 AddEmModel(1, EmModel(0)); << 131 AddEmModel(1, EmModel(1));
117 } << 132 }
118 } 133 }
119 134
120 //....oooOO0OOooo........oooOO0OOooo........oo 135 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 136
>> 137 void G4PolarizedCompton::PrintInfo()
>> 138 {
>> 139 G4cout << " Total cross sections has a good parametrisation"
>> 140 << " from 10 KeV to (100/Z) GeV"
>> 141 << "\n Sampling according " << EmModel(1)->GetName() << " model"
>> 142 << G4endl;
>> 143 }
>> 144
>> 145 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 146
121 void G4PolarizedCompton::SetModel(const G4Stri 147 void G4PolarizedCompton::SetModel(const G4String& ss)
122 { 148 {
123 if(ss == "Klein-Nishina") << 149 if(ss == "Klein-Nishina") { mType = 0; }
124 { << 150 if(ss == "Polarized-Compton") { mType = 10; }
125 fType = 0; <<
126 } <<
127 if(ss == "Polarized-Compton") <<
128 { <<
129 fType = 10; <<
130 } <<
131 } 151 }
132 152
133 //....oooOO0OOooo........oooOO0OOooo........oo 153 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 154
134 G4double G4PolarizedCompton::GetMeanFreePath(c 155 G4double G4PolarizedCompton::GetMeanFreePath(const G4Track& aTrack,
135 G << 156 G4double previousStepSize,
136 G << 157 G4ForceCondition* condition)
137 { 158 {
138 // *** get unploarised mean free path from l 159 // *** get unploarised mean free path from lambda table ***
139 G4double mfp = << 160 G4double mfp = G4VEmProcess::GetMeanFreePath(aTrack, previousStepSize, condition);
140 G4VEmProcess::GetMeanFreePath(aTrack, prev <<
141 161
142 if(theAsymmetryTable && fUseAsymmetryTable & << 162 if (theAsymmetryTable && useAsymmetryTable && mfp < DBL_MAX) {
143 { <<
144 mfp *= ComputeSaturationFactor(aTrack); 163 mfp *= ComputeSaturationFactor(aTrack);
145 } 164 }
146 if(verboseLevel >= 2) << 165 if (verboseLevel>=2) {
147 { << 166 G4cout << "G4PolarizedCompton::MeanFreePath: " << mfp / mm << " mm " << G4endl;
148 G4cout << "G4PolarizedCompton::MeanFreePat <<
149 << G4endl; <<
150 } 167 }
151 return mfp; 168 return mfp;
152 } 169 }
153 170
154 //....oooOO0OOooo........oooOO0OOooo........oo 171 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 172
155 G4double G4PolarizedCompton::PostStepGetPhysic 173 G4double G4PolarizedCompton::PostStepGetPhysicalInteractionLength(
156 const G4Track& aTrack, G4double previousStep << 174 const G4Track& aTrack,
>> 175 G4double previousStepSize,
>> 176 G4ForceCondition* condition)
157 { 177 {
158 // save previous values << 178 // save previous value
159 G4double nLength = theNumberOfInteractionLen 179 G4double nLength = theNumberOfInteractionLengthLeft;
160 G4double iLength = currentInteractionLength; <<
161 180
162 // *** compute unpolarized step limit *** << 181 // *** compute uppolarized step limit ***
163 // this changes theNumberOfInteractionLength << 182 G4double x = G4VEmProcess::PostStepGetPhysicalInteractionLength(aTrack,
164 G4double x = G4VEmProcess::PostStepGetPhysic << 183 previousStepSize,
165 aTrack, previousStepSize, condition); << 184 condition);
166 G4double x0 = x; <<
167 G4double satFact = 1.0; <<
168 185
169 // *** add corrections on polarisation *** 186 // *** add corrections on polarisation ***
170 if(theAsymmetryTable && fUseAsymmetryTable & << 187 if (theAsymmetryTable && useAsymmetryTable && x < DBL_MAX) {
171 { << 188 G4double curLength = currentInteractionLength*ComputeSaturationFactor(aTrack);
172 satFact = ComputeSaturationFact << 189 if(nLength > 0.0) {
173 G4double curLength = currentInteractionLen << 190 theNumberOfInteractionLengthLeft =
174 G4double prvLength = iLength * satFact; << 191 std::max(nLength - previousStepSize/curLength, 0.0);
175 if(nLength > 0.0) <<
176 { <<
177 theNumberOfInteractionLengthLeft = <<
178 std::max(nLength - previousStepSize / <<
179 } 192 }
180 x = theNumberOfInteractionLengthLeft * cur 193 x = theNumberOfInteractionLengthLeft * curLength;
181 } 194 }
182 if(verboseLevel >= 2) << 195 if (verboseLevel>=2) {
183 { << 196 G4cout << "G4PolarizedCompton::PostStepGetPhysicalInteractionLength: "
184 G4cout << "G4PolarizedCompton::PostStepGPI << 197 << x/mm << " mm " << G4endl;
185 << x / mm << " mm;" << G4endl <<
186 << " unpolarized valu <<
187 << x0 / mm << " mm." << G4endl; <<
188 } 198 }
189 return x; 199 return x;
190 } 200 }
191 201
192 //....oooOO0OOooo........oooOO0OOooo........oo 202 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 203
193 G4double G4PolarizedCompton::ComputeSaturation 204 G4double G4PolarizedCompton::ComputeSaturationFactor(const G4Track& aTrack)
194 { 205 {
195 G4double factor = 1.0; 206 G4double factor = 1.0;
196 207
197 // *** get asymmetry, if target is polarized 208 // *** get asymmetry, if target is polarized ***
198 const G4DynamicParticle* aDynamicGamma = aTr 209 const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
199 const G4double GammaEnergy = aDy << 210 const G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
200 const G4StokesVector GammaPolarization = << 211 const G4StokesVector GammaPolarization = aTrack.GetPolarization();
201 G4StokesVector(aTrack.GetPolarization()); << 212 const G4ParticleMomentum GammaDirection0 = aDynamicGamma->GetMomentumDirection();
202 const G4ParticleMomentum GammaDirection0 = << 213
203 aDynamicGamma->GetMomentumDirection(); << 214 G4Material* aMaterial = aTrack.GetMaterial();
204 << 215 G4VPhysicalVolume* aPVolume = aTrack.GetVolume();
205 const G4Material* aMaterial = aTrack.GetMate << 216 G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume();
206 G4VPhysicalVolume* aPVolume = aTrack.GetVolu << 217
207 G4LogicalVolume* aLVolume = aPVolume->GetL << 218 // G4Material* bMaterial = aLVolume->GetMaterial();
208 << 219 G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance();
209 G4PolarizationManager* polarizationManager = << 220
210 G4PolarizationManager::GetInstance(); << 221 const G4bool VolumeIsPolarized = polarizationManger->IsPolarized(aLVolume);
211 << 222 G4StokesVector ElectronPolarization = polarizationManger->GetVolumePolarization(aLVolume);
212 const G4bool VolumeIsPolarized = polarizatio << 223
213 G4StokesVector ElectronPolarization = << 224 if (VolumeIsPolarized) {
214 polarizationManager->GetVolumePolarization << 225
215 << 226 if (verboseLevel>=2) {
216 if(VolumeIsPolarized) <<
217 { <<
218 if(verboseLevel >= 2) <<
219 { <<
220 G4cout << "G4PolarizedCompton::ComputeSa 227 G4cout << "G4PolarizedCompton::ComputeSaturationFactor: " << G4endl;
221 G4cout << " Mom " << GammaDirection0 << << 228 G4cout << " Mom " << GammaDirection0 << G4endl;
222 G4cout << " Polarization " << GammaPolar << 229 G4cout << " Polarization " << GammaPolarization << G4endl;
223 G4cout << " MaterialPol. " << ElectronPo << 230 G4cout << " MaterialPol. " << ElectronPolarization << G4endl;
224 G4cout << " Phys. Volume " << aPVolume-> 231 G4cout << " Phys. Volume " << aPVolume->GetName() << G4endl;
225 G4cout << " Log. Volume " << aLVolume-> 232 G4cout << " Log. Volume " << aLVolume->GetName() << G4endl;
226 G4cout << " Material " << aMaterial << 233 G4cout << " Material " << aMaterial << G4endl;
227 } 234 }
228 235
229 std::size_t midx = CurrentMa << 236 size_t midx = CurrentMaterialCutsCoupleIndex();
230 const G4PhysicsVector* aVector = nullptr; 237 const G4PhysicsVector* aVector = nullptr;
231 if(midx < theAsymmetryTable->size()) << 238 if(midx < theAsymmetryTable->size()) {
232 { <<
233 aVector = (*theAsymmetryTable)(midx); 239 aVector = (*theAsymmetryTable)(midx);
234 } 240 }
235 if(aVector) << 241 if (aVector) {
236 { <<
237 G4double asymmetry = aVector->Value(Gamm 242 G4double asymmetry = aVector->Value(GammaEnergy);
238 243
239 // we have to determine angle between p << 244 // we have to determine angle between particle motion
240 // and target polarisation here << 245 // and target polarisation here
241 // circ pol * Vec(ElectronPol)*Vec( 246 // circ pol * Vec(ElectronPol)*Vec(PhotonMomentum)
242 // both vectors in global reference fra 247 // both vectors in global reference frame
243 << 248
244 G4double pol = ElectronPolarizati << 249 G4double pol = ElectronPolarization*GammaDirection0;
245 G4double polProduct = GammaPolarization. 250 G4double polProduct = GammaPolarization.p3() * pol;
246 factor /= (1. + polProduct * asymmetry); 251 factor /= (1. + polProduct * asymmetry);
247 if(verboseLevel >= 2) << 252 if (verboseLevel>=2) {
248 { << 253 G4cout << " Asymmetry: " << asymmetry << G4endl;
249 G4cout << " Asymmetry: " << asymme << 254 G4cout << " PolProduct: " << polProduct << G4endl;
250 G4cout << " PolProduct: " << polPro << 255 G4cout << " Factor: " << factor << G4endl;
251 G4cout << " Factor: " << factor << 256 }
252 } << 257 } else {
253 } <<
254 else <<
255 { <<
256 G4ExceptionDescription ed; 258 G4ExceptionDescription ed;
257 ed << "Problem with asymmetry table: mat << 259 ed << "Problem with asymmetry table: material index " << midx
258 << " is out of range or the table is << 260 << " is out of range or the table is not filled";
259 G4Exception("G4PolarizedComptonModel::Co << 261 G4Exception("G4PolarizedComptonModel::ComputeSaturationFactor","em0048",
260 JustWarning, ed, ""); << 262 JustWarning, ed, "");
261 } 263 }
262 } 264 }
263 return factor; 265 return factor;
264 } 266 }
265 267
266 //....oooOO0OOooo........oooOO0OOooo........oo 268 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 269
267 void G4PolarizedCompton::BuildPhysicsTable(con 270 void G4PolarizedCompton::BuildPhysicsTable(const G4ParticleDefinition& part)
268 { 271 {
269 // *** build (unpolarized) cross section tab 272 // *** build (unpolarized) cross section tables (Lambda)
270 G4VEmProcess::BuildPhysicsTable(part); 273 G4VEmProcess::BuildPhysicsTable(part);
271 if(fBuildAsymmetryTable && fEmModel) << 274 if(buildAsymmetryTable && emModel) {
272 { <<
273 G4bool isMaster = true; 275 G4bool isMaster = true;
274 const G4PolarizedCompton* masterProcess = << 276 const G4PolarizedCompton* masterProcess =
275 static_cast<const G4PolarizedCompton*>(G 277 static_cast<const G4PolarizedCompton*>(GetMasterProcess());
276 if(masterProcess && masterProcess != this) << 278 if(masterProcess && masterProcess != this) { isMaster = false; }
277 { << 279 if(isMaster) { BuildAsymmetryTable(part); }
278 isMaster = false; <<
279 } <<
280 if(isMaster) <<
281 { <<
282 BuildAsymmetryTable(part); <<
283 } <<
284 } 280 }
285 } 281 }
286 282
287 //....oooOO0OOooo........oooOO0OOooo........oo 283 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 284
288 void G4PolarizedCompton::BuildAsymmetryTable(c 285 void G4PolarizedCompton::BuildAsymmetryTable(const G4ParticleDefinition& part)
289 { 286 {
290 // cleanup old, initialise new table 287 // cleanup old, initialise new table
291 CleanTable(); 288 CleanTable();
292 theAsymmetryTable = << 289 theAsymmetryTable =
293 G4PhysicsTableHelper::PreparePhysicsTable( 290 G4PhysicsTableHelper::PreparePhysicsTable(theAsymmetryTable);
294 291
295 // Access to materials 292 // Access to materials
296 const G4ProductionCutsTable* theCoupleTable << 293 const G4ProductionCutsTable* theCoupleTable=
297 G4ProductionCutsTable::GetProductionCutsTa << 294 G4ProductionCutsTable::GetProductionCutsTable();
298 G4int numOfCouples = (G4int)theCoupleTable-> << 295 size_t numOfCouples = theCoupleTable->GetTableSize();
299 if(!theAsymmetryTable) << 296 if(!theAsymmetryTable) { return; }
300 { << 297 G4int nbins = LambdaBinning();
301 return; << 298 G4double emin = MinKinEnergy();
302 } << 299 G4double emax = MaxKinEnergy();
303 G4int nbins = LambdaBinning( << 300 G4PhysicsLogVector* aVector = 0;
304 G4double emin = MinKinEnergy() << 301 G4PhysicsLogVector* bVector = 0;
305 G4double emax = MaxKinEnergy() << 302
306 G4PhysicsLogVector* aVector = nullptr; << 303 for(size_t i=0; i<numOfCouples; ++i) {
307 G4PhysicsLogVector* bVector = nullptr; << 304 if (theAsymmetryTable->GetFlag(i)) {
308 << 305
309 for(G4int i = 0; i < numOfCouples; ++i) <<
310 { <<
311 if(theAsymmetryTable->GetFlag(i)) <<
312 { <<
313 // create physics vector and fill it 306 // create physics vector and fill it
314 const G4MaterialCutsCouple* couple = << 307 const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
315 theCoupleTable->GetMaterialCutsCouple( <<
316 // use same parameters as for lambda 308 // use same parameters as for lambda
317 if(!aVector) << 309 if(!aVector) {
318 { << 310 aVector = new G4PhysicsLogVector(emin, emax, nbins);
319 aVector = new G4PhysicsLogVector(emin, << 311 aVector->SetSpline(true);
320 bVector = aVector; 312 bVector = aVector;
321 } << 313 } else {
322 else << 314 bVector = new G4PhysicsLogVector(*aVector);
323 { <<
324 bVector = new G4PhysicsLogVector(*aVec <<
325 } 315 }
326 316
327 for(G4int j = 0; j <= nbins; ++j) << 317 for (G4int j = 0; j <= nbins; ++j ) {
328 { << 318 G4double energy = bVector->Energy(j);
329 G4double energy = bVector->Energy(j); << 319 G4double tasm=0.;
330 G4double tasm = 0.; << 320 G4double asym = ComputeAsymmetry(energy, couple, part, 0., tasm);
331 G4double asym = ComputeAsymmetry(ene << 321 bVector->PutValue(j,asym);
332 bVector->PutValue(j, asym); <<
333 } 322 }
334 bVector->FillSecondDerivatives(); <<
335 G4PhysicsTableHelper::SetPhysicsVector(t 323 G4PhysicsTableHelper::SetPhysicsVector(theAsymmetryTable, i, bVector);
336 } 324 }
337 } 325 }
338 } 326 }
339 327
340 //....oooOO0OOooo........oooOO0OOooo........oo 328 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
341 G4double G4PolarizedCompton::ComputeAsymmetry( << 329
342 G4double energy, const G4MaterialCutsCouple* << 330 G4double G4PolarizedCompton::ComputeAsymmetry(G4double energy,
343 const G4ParticleDefinition& aParticle, G4dou << 331 const G4MaterialCutsCouple* couple,
>> 332 const G4ParticleDefinition& aParticle,
>> 333 G4double cut,
>> 334 G4double & tAsymmetry)
344 { 335 {
345 G4double lAsymmetry = 0.0; 336 G4double lAsymmetry = 0.0;
346 tAsymmetry = 0; << 337 tAsymmetry=0;
347 338
>> 339 //
348 // calculate polarized cross section 340 // calculate polarized cross section
349 G4ThreeVector thePolarization = G4ThreeVecto << 341 //
350 fEmModel->SetTargetPolarization(thePolarizat << 342 G4ThreeVector thePolarization=G4ThreeVector(0.,0.,1.);
351 fEmModel->SetBeamPolarization(thePolarizatio << 343 emModel->SetTargetPolarization(thePolarization);
352 G4double sigma2 = << 344 emModel->SetBeamPolarization(thePolarization);
353 fEmModel->CrossSection(couple, &aParticle, << 345 G4double sigma2=emModel->CrossSection(couple,&aParticle,energy,cut,energy);
354 346
>> 347 //
355 // calculate unpolarized cross section 348 // calculate unpolarized cross section
356 thePolarization = G4ThreeVector(); << 349 //
357 fEmModel->SetTargetPolarization(thePolarizat << 350 thePolarization=G4ThreeVector();
358 fEmModel->SetBeamPolarization(thePolarizatio << 351 emModel->SetTargetPolarization(thePolarization);
359 G4double sigma0 = << 352 emModel->SetBeamPolarization(thePolarization);
360 fEmModel->CrossSection(couple, &aParticle, << 353 G4double sigma0=emModel->CrossSection(couple,&aParticle,energy,cut,energy);
361 << 354
362 // determine asymmetries << 355 // determine assymmetries
363 if(sigma0 > 0.) << 356 if (sigma0 > 0.) {
364 { << 357 lAsymmetry = sigma2/sigma0-1.;
365 lAsymmetry = sigma2 / sigma0 - 1.; <<
366 } 358 }
367 return lAsymmetry; 359 return lAsymmetry;
368 } 360 }
>> 361
>> 362 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
369 363