[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // $Id: G4PolarizedAnnihilationModel.cc,v 1.6 2007/07/10 09:38:17 schaelic Exp $ |
---|
| 27 | // GEANT4 tag $Name: $ |
---|
| 28 | // |
---|
| 29 | // ------------------------------------------------------------------- |
---|
| 30 | // |
---|
| 31 | // GEANT4 Class file |
---|
| 32 | // |
---|
| 33 | // |
---|
| 34 | // File name: G4PolarizedAnnihilationModel |
---|
| 35 | // |
---|
| 36 | // Author: Andreas Schaelicke |
---|
| 37 | // |
---|
| 38 | // Creation date: 01.05.2005 |
---|
| 39 | // |
---|
| 40 | // Modifications: |
---|
| 41 | // 18-07-06 use newly calculated cross sections (P. Starovoitov) |
---|
| 42 | // 21-08-06 update interface (A. Schaelicke) |
---|
| 43 | // 17-11-06 add protection agaist e+ zero energy PostStep (V.Ivanchenko) |
---|
| 44 | // 10-07-07 copied Initialise() method from G4eeToTwoGammaModel to provide a |
---|
| 45 | // local ParticleChangeForGamma object and reduce overhead |
---|
| 46 | // in SampleSecondaries() (A. Schaelicke) |
---|
| 47 | // |
---|
| 48 | // |
---|
| 49 | // Class Description: |
---|
| 50 | // |
---|
| 51 | // Implementation of polarized gamma Annihilation scattering on free electron |
---|
| 52 | // |
---|
| 53 | |
---|
| 54 | // ------------------------------------------------------------------- |
---|
| 55 | #include "G4PolarizedAnnihilationModel.hh" |
---|
| 56 | #include "G4PolarizationManager.hh" |
---|
| 57 | #include "G4PolarizationHelper.hh" |
---|
| 58 | #include "G4StokesVector.hh" |
---|
| 59 | #include "G4PolarizedAnnihilationCrossSection.hh" |
---|
| 60 | #include "G4ParticleChangeForGamma.hh" |
---|
| 61 | #include "G4TrackStatus.hh" |
---|
| 62 | #include "G4Gamma.hh" |
---|
| 63 | |
---|
| 64 | G4PolarizedAnnihilationModel::G4PolarizedAnnihilationModel(const G4ParticleDefinition* p, |
---|
| 65 | const G4String& nam) |
---|
| 66 | : G4eeToTwoGammaModel(p,nam),crossSectionCalculator(0),gParticleChange(0), |
---|
| 67 | gIsInitialised(false) |
---|
| 68 | { |
---|
| 69 | crossSectionCalculator=new G4PolarizedAnnihilationCrossSection(); |
---|
| 70 | } |
---|
| 71 | |
---|
| 72 | G4PolarizedAnnihilationModel::~G4PolarizedAnnihilationModel() |
---|
| 73 | { |
---|
| 74 | if (crossSectionCalculator) delete crossSectionCalculator; |
---|
| 75 | } |
---|
| 76 | |
---|
| 77 | |
---|
| 78 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 79 | |
---|
| 80 | void G4PolarizedAnnihilationModel::Initialise(const G4ParticleDefinition*, |
---|
| 81 | const G4DataVector&) |
---|
| 82 | { |
---|
| 83 | // G4eeToTwoGammaModel::Initialise(part,dv); |
---|
| 84 | if(gIsInitialised) return; |
---|
| 85 | |
---|
| 86 | if(pParticleChange) |
---|
| 87 | gParticleChange = |
---|
| 88 | reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange); |
---|
| 89 | else |
---|
| 90 | gParticleChange = new G4ParticleChangeForGamma(); |
---|
| 91 | |
---|
| 92 | gIsInitialised = true; |
---|
| 93 | } |
---|
| 94 | |
---|
| 95 | G4double G4PolarizedAnnihilationModel::ComputeCrossSectionPerElectron( |
---|
| 96 | const G4ParticleDefinition* pd, |
---|
| 97 | G4double kinEnergy, |
---|
| 98 | G4double cut, |
---|
| 99 | G4double emax) |
---|
| 100 | { |
---|
| 101 | G4double xs = G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(pd,kinEnergy, |
---|
| 102 | cut,emax); |
---|
| 103 | |
---|
| 104 | G4double polzz = theBeamPolarization.z()*theTargetPolarization.z(); |
---|
| 105 | G4double poltt = theBeamPolarization.x()*theTargetPolarization.x() |
---|
| 106 | + theBeamPolarization.y()*theTargetPolarization.y(); |
---|
| 107 | if (polzz!=0 || poltt!=0) { |
---|
| 108 | G4double xval,lasym,tasym; |
---|
| 109 | ComputeAsymmetriesPerElectron(kinEnergy,xval,lasym,tasym); |
---|
| 110 | xs*=(1.+polzz*lasym+poltt*tasym); |
---|
| 111 | } |
---|
| 112 | |
---|
| 113 | return xs; |
---|
| 114 | } |
---|
| 115 | |
---|
| 116 | void G4PolarizedAnnihilationModel::ComputeAsymmetriesPerElectron(G4double ene, |
---|
| 117 | G4double & valueX, |
---|
| 118 | G4double & valueA, |
---|
| 119 | G4double & valueT) |
---|
| 120 | { |
---|
| 121 | // *** calculate asymmetries |
---|
| 122 | G4double gam = 1. + ene/electron_mass_c2; |
---|
| 123 | G4double xs0=crossSectionCalculator->TotalXSection(0.,1.,gam, |
---|
| 124 | G4StokesVector::ZERO, |
---|
| 125 | G4StokesVector::ZERO); |
---|
| 126 | G4double xsA=crossSectionCalculator->TotalXSection(0.,1.,gam, |
---|
| 127 | G4StokesVector::P3, |
---|
| 128 | G4StokesVector::P3); |
---|
| 129 | G4double xsT1=crossSectionCalculator->TotalXSection(0.,1.,gam, |
---|
| 130 | G4StokesVector::P1, |
---|
| 131 | G4StokesVector::P1); |
---|
| 132 | G4double xsT2=crossSectionCalculator->TotalXSection(0.,1.,gam, |
---|
| 133 | G4StokesVector::P2, |
---|
| 134 | G4StokesVector::P2); |
---|
| 135 | G4double xsT=0.5*(xsT1+xsT2); |
---|
| 136 | |
---|
| 137 | valueX=xs0; |
---|
| 138 | valueA=xsA/xs0-1.; |
---|
| 139 | valueT=xsT/xs0-1.; |
---|
| 140 | // G4cout<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl; |
---|
| 141 | if ( (valueA < -1) || (1 < valueA)) { |
---|
| 142 | G4cout<< " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n"; |
---|
| 143 | G4cout<< " something wrong in total cross section calculation (valueA)\n"; |
---|
| 144 | G4cout<<"*********** LONG "<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl; |
---|
| 145 | } |
---|
| 146 | if ( (valueT < -1) || (1 < valueT)) { |
---|
| 147 | G4cout<< " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n"; |
---|
| 148 | G4cout<< " something wrong in total cross section calculation (valueT)\n"; |
---|
| 149 | G4cout<<"****** TRAN "<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl; |
---|
| 150 | } |
---|
| 151 | } |
---|
| 152 | |
---|
| 153 | |
---|
| 154 | void G4PolarizedAnnihilationModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
---|
| 155 | const G4MaterialCutsCouple* /*couple*/, |
---|
| 156 | const G4DynamicParticle* dp, |
---|
| 157 | G4double /*tmin*/, |
---|
| 158 | G4double /*maxEnergy*/) |
---|
| 159 | { |
---|
| 160 | // G4ParticleChangeForGamma* gParticleChange |
---|
| 161 | // = dynamic_cast<G4ParticleChangeForGamma*>(pParticleChange); |
---|
| 162 | const G4Track * aTrack = gParticleChange->GetCurrentTrack(); |
---|
| 163 | |
---|
| 164 | // kill primary |
---|
| 165 | gParticleChange->SetProposedKineticEnergy(0.); |
---|
| 166 | gParticleChange->ProposeTrackStatus(fStopAndKill); |
---|
| 167 | |
---|
| 168 | // V.Ivanchenko add protection against zero kin energy |
---|
| 169 | G4double PositKinEnergy = dp->GetKineticEnergy(); |
---|
| 170 | |
---|
| 171 | if(PositKinEnergy < DBL_MIN) { |
---|
| 172 | |
---|
| 173 | G4double cosTeta = 2.*G4UniformRand()-1.; |
---|
| 174 | G4double sinTeta = std::sqrt((1.0 - cosTeta)*(1.0 + cosTeta)); |
---|
| 175 | G4double phi = twopi * G4UniformRand(); |
---|
| 176 | G4ThreeVector dir(sinTeta*std::cos(phi), sinTeta*std::sin(phi), cosTeta); |
---|
| 177 | fvect->push_back( new G4DynamicParticle(G4Gamma::Gamma(), dir, electron_mass_c2)); |
---|
| 178 | fvect->push_back( new G4DynamicParticle(G4Gamma::Gamma(),-dir, electron_mass_c2)); |
---|
| 179 | return; |
---|
| 180 | } |
---|
| 181 | |
---|
| 182 | // *** obtain and save target and beam polarization *** |
---|
| 183 | G4PolarizationManager * polarizationManager = G4PolarizationManager::GetInstance(); |
---|
| 184 | |
---|
| 185 | // obtain polarization of the beam |
---|
| 186 | theBeamPolarization = aTrack->GetPolarization(); |
---|
| 187 | |
---|
| 188 | // obtain polarization of the media |
---|
| 189 | G4VPhysicalVolume* aPVolume = aTrack->GetVolume(); |
---|
| 190 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
---|
| 191 | const G4bool targetIsPolarized = polarizationManager->IsPolarized(aLVolume); |
---|
| 192 | theTargetPolarization = polarizationManager->GetVolumePolarization(aLVolume); |
---|
| 193 | |
---|
| 194 | // transfer target electron polarization in frame of positron |
---|
| 195 | if (targetIsPolarized) |
---|
| 196 | theTargetPolarization.rotateUz(dp->GetMomentumDirection()); |
---|
| 197 | |
---|
| 198 | G4ParticleMomentum PositDirection = dp->GetMomentumDirection(); |
---|
| 199 | |
---|
| 200 | // polar asymmetry: |
---|
| 201 | G4double polarization = theBeamPolarization.p3()*theTargetPolarization.p3(); |
---|
| 202 | |
---|
| 203 | G4double gamam1 = PositKinEnergy/electron_mass_c2; |
---|
| 204 | G4double gama = gamam1+1. , gamap1 = gamam1+2.; |
---|
| 205 | G4double sqgrate = std::sqrt(gamam1/gamap1)/2. , sqg2m1 = std::sqrt(gamam1*gamap1); |
---|
| 206 | |
---|
| 207 | // limits of the energy sampling |
---|
| 208 | G4double epsilmin = 0.5 - sqgrate , epsilmax = 0.5 + sqgrate; |
---|
| 209 | G4double epsilqot = epsilmax/epsilmin; |
---|
| 210 | |
---|
| 211 | // |
---|
| 212 | // sample the energy rate of the created gammas |
---|
| 213 | // note: for polarized partices, the actual dicing strategy |
---|
| 214 | // will depend on the energy, and the degree of polarization !! |
---|
| 215 | // |
---|
| 216 | G4double epsil; |
---|
| 217 | G4double gmax=1. + std::fabs(polarization); // crude estimate |
---|
| 218 | |
---|
| 219 | G4bool check_range=true; |
---|
| 220 | |
---|
| 221 | crossSectionCalculator->Initialize(epsilmin, gama, 0., theBeamPolarization, theTargetPolarization); |
---|
| 222 | if (crossSectionCalculator->DiceEpsilon()<0) { |
---|
| 223 | G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n" |
---|
| 224 | <<"epsilmin DiceRoutine not appropriate ! "<<crossSectionCalculator->DiceEpsilon()<<G4endl; |
---|
| 225 | check_range=false; |
---|
| 226 | } |
---|
| 227 | |
---|
| 228 | crossSectionCalculator->Initialize(epsilmax, gama, 0., theBeamPolarization, theTargetPolarization); |
---|
| 229 | if (crossSectionCalculator->DiceEpsilon()<0) { |
---|
| 230 | G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n" |
---|
| 231 | <<"epsilmax DiceRoutine not appropriate ! "<<crossSectionCalculator->DiceEpsilon()<<G4endl; |
---|
| 232 | check_range=false; |
---|
| 233 | } |
---|
| 234 | |
---|
| 235 | G4int ncount=0; |
---|
| 236 | G4double trejectmax=0.; |
---|
| 237 | G4double treject; |
---|
| 238 | |
---|
| 239 | |
---|
| 240 | do { |
---|
| 241 | // |
---|
| 242 | epsil = epsilmin*std::pow(epsilqot,G4UniformRand()); |
---|
| 243 | |
---|
| 244 | crossSectionCalculator->Initialize(epsil, gama, 0., theBeamPolarization, theTargetPolarization,1); |
---|
| 245 | |
---|
| 246 | treject = crossSectionCalculator->DiceEpsilon(); |
---|
| 247 | treject*=epsil; |
---|
| 248 | |
---|
| 249 | if (treject>gmax || treject<0.) |
---|
| 250 | G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n" |
---|
| 251 | <<" eps ("<<epsil<<") rejection does not work properly: "<<treject<<G4endl; |
---|
| 252 | ++ncount; |
---|
| 253 | if (treject>trejectmax) trejectmax=treject; |
---|
| 254 | if (ncount>1000) { |
---|
| 255 | G4cout<<"WARNING in PolarizedAnnihilationPS::PostStepDoIt\n" |
---|
| 256 | <<"eps dicing very inefficient ="<<trejectmax/gmax |
---|
| 257 | <<", "<<treject/gmax<<". For secondary energy = "<<epsil<<" "<<ncount<<G4endl; |
---|
| 258 | break; |
---|
| 259 | } |
---|
| 260 | |
---|
| 261 | } while( treject < gmax*G4UniformRand() ); |
---|
| 262 | |
---|
| 263 | // |
---|
| 264 | // scattered Gamma angles. ( Z - axis along the parent positron) |
---|
| 265 | // |
---|
| 266 | |
---|
| 267 | G4double cost = (epsil*gamap1-1.)/(epsil*sqg2m1); |
---|
| 268 | G4double sint = std::sqrt((1.+cost)*(1.-cost)); |
---|
| 269 | G4double phi = 0.; |
---|
| 270 | G4double beamTrans = std::sqrt(sqr(theBeamPolarization.p1()) + sqr(theBeamPolarization.p2())); |
---|
| 271 | G4double targetTrans = std::sqrt(sqr(theTargetPolarization.p1()) + sqr(theTargetPolarization.p2())); |
---|
| 272 | |
---|
| 273 | // G4cout<<"phi dicing START"<<G4endl; |
---|
| 274 | do{ |
---|
| 275 | phi = twopi * G4UniformRand(); |
---|
| 276 | crossSectionCalculator->Initialize(epsil, gama, 0., theBeamPolarization, theTargetPolarization,2); |
---|
| 277 | |
---|
| 278 | G4double gdiced =crossSectionCalculator->getVar(0); |
---|
| 279 | gdiced += crossSectionCalculator->getVar(3)*theBeamPolarization.p3()*theTargetPolarization.p3(); |
---|
| 280 | gdiced += 1.*(std::fabs(crossSectionCalculator->getVar(1)) |
---|
| 281 | + std::fabs(crossSectionCalculator->getVar(2)))*beamTrans*targetTrans; |
---|
| 282 | gdiced += 1.*std::fabs(crossSectionCalculator->getVar(4)) |
---|
| 283 | *(std::fabs(theBeamPolarization.p3())*targetTrans + std::fabs(theTargetPolarization.p3())*beamTrans); |
---|
| 284 | |
---|
| 285 | G4double gdist = crossSectionCalculator->getVar(0); |
---|
| 286 | gdist += crossSectionCalculator->getVar(3)*theBeamPolarization.p3()*theTargetPolarization.p3(); |
---|
| 287 | gdist += crossSectionCalculator->getVar(1)*(std::cos(phi)*theBeamPolarization.p1() |
---|
| 288 | + std::sin(phi)*theBeamPolarization.p2()) |
---|
| 289 | *(std::cos(phi)*theTargetPolarization.p1() |
---|
| 290 | + std::sin(phi)*theTargetPolarization.p2()); |
---|
| 291 | gdist += crossSectionCalculator->getVar(2)*(std::cos(phi)*theBeamPolarization.p2() |
---|
| 292 | - std::sin(phi)*theBeamPolarization.p1()) |
---|
| 293 | *(std::cos(phi)*theTargetPolarization.p2() |
---|
| 294 | - std::sin(phi)*theTargetPolarization.p1()); |
---|
| 295 | gdist += crossSectionCalculator->getVar(4) |
---|
| 296 | *(std::cos(phi)*theBeamPolarization.p3()*theTargetPolarization.p1() |
---|
| 297 | + std::cos(phi)*theBeamPolarization.p1()*theTargetPolarization.p3() |
---|
| 298 | + std::sin(phi)*theBeamPolarization.p3()*theTargetPolarization.p2() |
---|
| 299 | + std::sin(phi)*theBeamPolarization.p2()*theTargetPolarization.p3()); |
---|
| 300 | |
---|
| 301 | treject = gdist/gdiced; |
---|
| 302 | //G4cout<<" treject = "<<treject<<" at phi = "<<phi<<G4endl; |
---|
| 303 | if (treject>1.+1.e-10 || treject<0){ |
---|
| 304 | G4cout<<"!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n" |
---|
| 305 | <<" phi rejection does not work properly: "<<treject<<G4endl; |
---|
| 306 | G4cout<<" gdiced = "<<gdiced<<G4endl; |
---|
| 307 | G4cout<<" gdist = "<<gdist<<G4endl; |
---|
| 308 | G4cout<<" epsil = "<<epsil<<G4endl; |
---|
| 309 | } |
---|
| 310 | |
---|
| 311 | if (treject<1.e-3) { |
---|
| 312 | G4cout<<"!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n" |
---|
| 313 | <<" phi rejection does not work properly: "<<treject<<"\n"; |
---|
| 314 | G4cout<<" gdiced="<<gdiced<<" gdist="<<gdist<<"\n"; |
---|
| 315 | G4cout<<" epsil = "<<epsil<<G4endl; |
---|
| 316 | } |
---|
| 317 | |
---|
| 318 | } while( treject < G4UniformRand() ); |
---|
| 319 | // G4cout<<"phi dicing END"<<G4endl; |
---|
| 320 | |
---|
| 321 | G4double dirx = sint*std::cos(phi) , diry = sint*std::sin(phi) , dirz = cost; |
---|
| 322 | |
---|
| 323 | // |
---|
| 324 | // kinematic of the created pair |
---|
| 325 | // |
---|
| 326 | G4double TotalAvailableEnergy = PositKinEnergy + 2*electron_mass_c2; |
---|
| 327 | G4double Phot1Energy = epsil*TotalAvailableEnergy; |
---|
| 328 | G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy; |
---|
| 329 | |
---|
| 330 | // *** prepare calculation of polarization transfer *** |
---|
| 331 | G4ThreeVector Phot1Direction (dirx, diry, dirz); |
---|
| 332 | |
---|
| 333 | // get interaction frame |
---|
| 334 | G4ThreeVector nInteractionFrame = |
---|
| 335 | G4PolarizationHelper::GetFrame(PositDirection,Phot1Direction); |
---|
| 336 | |
---|
| 337 | // define proper in-plane and out-of-plane component of initial spins |
---|
| 338 | theBeamPolarization.InvRotateAz(nInteractionFrame,PositDirection); |
---|
| 339 | theTargetPolarization.InvRotateAz(nInteractionFrame,PositDirection); |
---|
| 340 | |
---|
| 341 | // calculate spin transfere matrix |
---|
| 342 | |
---|
| 343 | crossSectionCalculator->Initialize(epsil,gama,phi,theBeamPolarization,theTargetPolarization,2); |
---|
| 344 | |
---|
| 345 | // ********************************************************************** |
---|
| 346 | |
---|
| 347 | Phot1Direction.rotateUz(PositDirection); |
---|
| 348 | // create G4DynamicParticle object for the particle1 |
---|
| 349 | G4DynamicParticle* aParticle1= new G4DynamicParticle (G4Gamma::Gamma(), |
---|
| 350 | Phot1Direction, Phot1Energy); |
---|
| 351 | finalGamma1Polarization=crossSectionCalculator->GetPol2(); |
---|
| 352 | G4double n1=finalGamma1Polarization.mag2(); |
---|
| 353 | if (n1>1) { |
---|
| 354 | G4cout<<"ERROR: PolarizedAnnihilation Polarization Vector at epsil = " |
---|
| 355 | <<epsil<<" is too large!!! \n" |
---|
| 356 | <<"annihi pol1= "<<finalGamma1Polarization<<", ("<<n1<<")\n"; |
---|
| 357 | finalGamma1Polarization+=1./std::sqrt(n1); |
---|
| 358 | } |
---|
| 359 | |
---|
| 360 | // define polarization of first final state photon |
---|
| 361 | finalGamma1Polarization.SetPhoton(); |
---|
| 362 | finalGamma1Polarization.RotateAz(nInteractionFrame,Phot1Direction); |
---|
| 363 | aParticle1->SetPolarization(finalGamma1Polarization.p1(), |
---|
| 364 | finalGamma1Polarization.p2(), |
---|
| 365 | finalGamma1Polarization.p3()); |
---|
| 366 | |
---|
| 367 | fvect->push_back(aParticle1); |
---|
| 368 | |
---|
| 369 | |
---|
| 370 | // ********************************************************************** |
---|
| 371 | |
---|
| 372 | G4double Eratio= Phot1Energy/Phot2Energy; |
---|
| 373 | G4double PositP= std::sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2)); |
---|
| 374 | G4ThreeVector Phot2Direction (-dirx*Eratio, -diry*Eratio, |
---|
| 375 | (PositP-dirz*Phot1Energy)/Phot2Energy); |
---|
| 376 | Phot2Direction.rotateUz(PositDirection); |
---|
| 377 | // create G4DynamicParticle object for the particle2 |
---|
| 378 | G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(), |
---|
| 379 | Phot2Direction, Phot2Energy); |
---|
| 380 | |
---|
| 381 | // define polarization of second final state photon |
---|
| 382 | finalGamma2Polarization=crossSectionCalculator->GetPol3(); |
---|
| 383 | G4double n2=finalGamma2Polarization.mag2(); |
---|
| 384 | if (n2>1) { |
---|
| 385 | G4cout<<"ERROR: PolarizedAnnihilation Polarization Vector at epsil = "<<epsil<<" is too large!!! \n"; |
---|
| 386 | G4cout<<"annihi pol2= "<<finalGamma2Polarization<<", ("<<n2<<")\n"; |
---|
| 387 | |
---|
| 388 | finalGamma2Polarization+=1./std::sqrt(n2); |
---|
| 389 | } |
---|
| 390 | finalGamma2Polarization.SetPhoton(); |
---|
| 391 | finalGamma2Polarization.RotateAz(nInteractionFrame,Phot2Direction); |
---|
| 392 | aParticle2->SetPolarization(finalGamma2Polarization.p1(), |
---|
| 393 | finalGamma2Polarization.p2(), |
---|
| 394 | finalGamma2Polarization.p3()); |
---|
| 395 | |
---|
| 396 | fvect->push_back(aParticle2); |
---|
| 397 | } |
---|