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1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 // 27 // Author: Luciano Pandola 28 // 29 // History: 30 // -------- 31 // 13 Jan 2010 L Pandola First implementa 32 // 24 May 2011 L Pandola Renamed (make v2 33 // 18 Sep 2013 L Pandola Migration to MT 34 // data and create 35 // 36 37 #include "G4PenelopeGammaConversionModel.hh" 38 #include "G4PhysicalConstants.hh" 39 #include "G4SystemOfUnits.hh" 40 #include "G4ParticleDefinition.hh" 41 #include "G4MaterialCutsCouple.hh" 42 #include "G4ProductionCutsTable.hh" 43 #include "G4DynamicParticle.hh" 44 #include "G4Element.hh" 45 #include "G4Gamma.hh" 46 #include "G4Electron.hh" 47 #include "G4Positron.hh" 48 #include "G4PhysicsFreeVector.hh" 49 #include "G4MaterialCutsCouple.hh" 50 #include "G4AutoLock.hh" 51 #include "G4Exp.hh" 52 53 //....oooOO0OOooo........oooOO0OOooo........oo 54 const G4int G4PenelopeGammaConversionModel::fM 55 G4PhysicsFreeVector* G4PenelopeGammaConversion 56 G4double G4PenelopeGammaConversionModel::fAtom 57 1.2281e+02,7.3167e+01,6.9 58 6.4696e+01,6.1228e+01,5.7 59 5.0787e+01,4.7851e+01,4.6 60 4.4503e+01,4.3815e+01,4.3 61 4.1586e+01,4.0953e+01,4.0 62 3.9756e+01,3.9144e+01,3.8 63 3.7174e+01,3.6663e+01,3.5 64 3.4688e+01,3.4197e+01,3.3 65 3.3068e+01,3.2740e+01,3.2 66 3.1884e+01,3.1622e+01,3.1 67 3.0950e+01,3.0758e+01,3.0 68 3.0097e+01,2.9832e+01,2.9 69 2.9247e+01,2.9085e+01,2.8 70 2.8580e+01,2.8442e+01,2.8 71 2.7973e+01,2.7819e+01,2.7 72 2.7285e+01,2.7093e+01,2.6 73 2.6516e+01,2.6304e+01,2.6 74 2.5730e+01,2.5577e+01,2.5 75 2.5100e+01,2.4941e+01,2.4 76 2.4506e+01,2.4391e+01,2.4 77 2.4039e+01,2.3922e+01,2.3 78 2.3621e+01,2.3523e+01,2.3 79 2.3238e+01,2.3139e+01,2.3 80 2.2833e+01,2.2694e+01,2.2 81 2.2446e+01,2.2358e+01,2.2 82 83 //....oooOO0OOooo........oooOO0OOooo........oo 84 85 G4PenelopeGammaConversionModel::G4PenelopeGamm 86 const G4String& nam) 87 :G4VEmModel(nam),fParticleChange(nullptr),fP 88 fEffectiveCharge(nullptr),fMaterialInvScree 89 fScreeningFunction(nullptr),fIsInitialised( 90 { 91 fIntrinsicLowEnergyLimit = 2.0*electron_mass 92 fIntrinsicHighEnergyLimit = 100.0*GeV; 93 fSmallEnergy = 1.1*MeV; 94 95 if (part) 96 SetParticle(part); 97 98 // SetLowEnergyLimit(fIntrinsicLowEnergyLim 99 SetHighEnergyLimit(fIntrinsicHighEnergyLimit 100 // 101 fVerboseLevel= 0; 102 // Verbosity scale: 103 // 0 = nothing 104 // 1 = warning for energy non-conservation 105 // 2 = details of energy budget 106 // 3 = calculation of cross sections, file o 107 // 4 = entering in methods 108 } 109 110 //....oooOO0OOooo........oooOO0OOooo........oo 111 112 G4PenelopeGammaConversionModel::~G4PenelopeGam 113 { 114 //Delete shared tables, they exist only in t 115 if (IsMaster() || fLocalTable) 116 { 117 for(G4int i=0; i<=fMaxZ; ++i) 118 { 119 if(fLogAtomicCrossSection[i]) { 120 delete fLogAtomicCrossSection[i]; 121 fLogAtomicCrossSection[i] = nullptr; 122 } 123 } 124 if (fEffectiveCharge) 125 delete fEffectiveCharge; 126 if (fMaterialInvScreeningRadius) 127 delete fMaterialInvScreeningRadius; 128 if (fScreeningFunction) 129 delete fScreeningFunction; 130 } 131 } 132 133 //....oooOO0OOooo........oooOO0OOooo........oo 134 135 void G4PenelopeGammaConversionModel::Initialis 136 const G4DataVector&) 137 { 138 if (fVerboseLevel > 3) 139 G4cout << "Calling G4PenelopeGammaConvers 140 141 SetParticle(part); 142 143 //Only the master model creates/fills/destro 144 if (IsMaster() && part == fParticle) 145 { 146 //delete old material data... 147 if (fEffectiveCharge) 148 { 149 delete fEffectiveCharge; 150 fEffectiveCharge = nullptr; 151 } 152 if (fMaterialInvScreeningRadius) 153 { 154 delete fMaterialInvScreeningRadius; 155 fMaterialInvScreeningRadius = nullptr; 156 } 157 if (fScreeningFunction) 158 { 159 delete fScreeningFunction; 160 fScreeningFunction = nullptr; 161 } 162 //and create new ones 163 fEffectiveCharge = new std::map<const G4 164 fMaterialInvScreeningRadius = new std::m 165 fScreeningFunction = new std::map<const 166 167 G4ProductionCutsTable* theCoupleTable = 168 G4ProductionCutsTable::GetProductionCutsTabl 169 170 for (G4int i=0;i<(G4int)theCoupleTable-> 171 { 172 const G4Material* material = 173 theCoupleTable->GetMaterialCutsCouple(i) 174 const G4ElementVector* theElementVector = 175 176 for (std::size_t j=0;j<material->GetNumber 177 { 178 G4int iZ = theElementVector->at(j)->Ge 179 //read data files only in the master 180 if (iZ <= fMaxZ && !fLogAtomicCrossSe 181 ReadDataFile(iZ); 182 } 183 184 //check if material data are available 185 if (!fEffectiveCharge->count(material)) 186 InitializeScreeningFunctions(material); 187 } 188 if (fVerboseLevel > 0) { 189 G4cout << "Penelope Gamma Conversion model v 190 << "Energy range: " 191 << LowEnergyLimit() / MeV << " MeV - 192 << HighEnergyLimit() / GeV << " GeV" 193 << G4endl; 194 } 195 } 196 if(fIsInitialised) return; 197 fParticleChange = GetParticleChangeForGamma( 198 fIsInitialised = true; 199 } 200 201 //....oooOO0OOooo........oooOO0OOooo........oo 202 203 void G4PenelopeGammaConversionModel::Initialis 204 G4VEmModel *masterModel) 205 { 206 if (fVerboseLevel > 3) 207 G4cout << "Calling G4PenelopeGammaConvers 208 // 209 //Check that particle matches: one might hav 210 //for e+ and e-). 211 // 212 if (part == fParticle) 213 { 214 //Get the const table pointers from the 215 const G4PenelopeGammaConversionModel* th 216 static_cast<G4PenelopeGammaConversionModel*> 217 218 //Copy pointers to the data tables 219 fEffectiveCharge = theModel->fEffectiveC 220 fMaterialInvScreeningRadius = theModel-> 221 fScreeningFunction = theModel->fScreenin 222 for(G4int i=0; i<=fMaxZ; ++i) 223 fLogAtomicCrossSection[i] = theModel->fLogAt 224 225 //Same verbosity for all workers, as the 226 fVerboseLevel = theModel->fVerboseLevel; 227 } 228 229 return; 230 } 231 232 //....oooOO0OOooo........oooOO0OOooo........oo 233 namespace { G4Mutex PenelopeGammaConversionMo 234 235 G4double G4PenelopeGammaConversionModel::Compu 236 const G4ParticleDefinition 237 G4double energy, 238 G4double Z, G4double, 239 G4double, G4double) 240 { 241 // 242 // Penelope model v2008. 243 // Cross section (including triplet producti 244 // through the G4CrossSectionHandler utility 245 // M.J. Berger and J.H. Hubbel (XCOM), Repor 246 // 247 248 if (energy < fIntrinsicLowEnergyLimit) 249 return 0; 250 251 G4int iZ = G4int(Z); 252 253 if (!fLogAtomicCrossSection[iZ]) 254 { 255 //If we are here, it means that Initial 256 //not filled up. This can happen in a U 257 if (fVerboseLevel > 0) 258 { 259 //Issue a G4Exception (warning) only in v 260 G4ExceptionDescription ed; 261 ed << "Unable to retrieve the cross secti 262 ed << "This can happen only in Unit Tests 263 G4Exception("G4PenelopeGammaConversionMod 264 "em2018",JustWarning,ed); 265 } 266 //protect file reading via autolock 267 G4AutoLock lock(&PenelopeGammaConversio 268 ReadDataFile(iZ); 269 lock.unlock(); 270 fLocalTable = true; 271 } 272 G4double cs = 0; 273 G4double logene = G4Log(energy); 274 G4PhysicsFreeVector* theVec = fLogAtomicCros 275 G4double logXS = theVec->Value(logene); 276 cs = G4Exp(logXS); 277 278 if (fVerboseLevel > 2) 279 G4cout << "Gamma conversion cross section 280 " = " << cs/barn << " barn" << G4endl; 281 return cs; 282 } 283 284 //....oooOO0OOooo........oooOO0OOooo........oo 285 286 void 287 G4PenelopeGammaConversionModel::SampleSecondar 288 const G4MaterialCutsCouple* coup 289 const G4DynamicParticle* aDynami 290 G4double, 291 G4double) 292 { 293 // 294 // Penelope model v2008. 295 // Final state is sampled according to the B 296 // corrections, according to the semi-empiri 297 // J. Baro' et al., Radiat. Phys. Chem. 44 298 // 299 // The model uses the high energy Coulomb co 300 // H. Davies et al., Phys. Rev. 93 (1954) 7 301 // and atomic screening radii tabulated from 302 // J.H. Hubbel et al., J. Phys. Chem. Ref. 303 // for Z= 1 to 92. 304 // 305 if (fVerboseLevel > 3) 306 G4cout << "Calling SamplingSecondaries() o 307 308 G4double photonEnergy = aDynamicGamma->GetKi 309 310 // Always kill primary 311 fParticleChange->ProposeTrackStatus(fStopAnd 312 fParticleChange->SetProposedKineticEnergy(0. 313 314 if (photonEnergy <= fIntrinsicLowEnergyLimit 315 { 316 fParticleChange->ProposeLocalEnergyDepos 317 return ; 318 } 319 320 G4ParticleMomentum photonDirection = aDynami 321 const G4Material* mat = couple->GetMaterial( 322 323 //Either Initialize() was not called, or we 324 //not invoked 325 if (!fEffectiveCharge) 326 { 327 //create a **thread-local** version of t 328 //Unit Tests 329 fLocalTable = true; 330 fEffectiveCharge = new std::map<const G4 331 fMaterialInvScreeningRadius = new std::m 332 fScreeningFunction = new std::map<const 333 } 334 335 if (!fEffectiveCharge->count(mat)) 336 { 337 //If we are here, it means that Initiali 338 //not filled up. This can happen in a Un 339 if (fVerboseLevel > 0) 340 { 341 //Issue a G4Exception (warning) only in ve 342 G4ExceptionDescription ed; 343 ed << "Unable to allocate the EffectiveCha 344 mat->GetName() << G4endl; 345 ed << "This can happen only in Unit Tests" 346 G4Exception("G4PenelopeGammaConversionMode 347 "em2019",JustWarning,ed); 348 } 349 //protect file reading via autolock 350 G4AutoLock lock(&PenelopeGammaConversion 351 InitializeScreeningFunctions(mat); 352 lock.unlock(); 353 } 354 355 // eps is the fraction of the photon energy 356 G4double eps = 0; 357 G4double eki = electron_mass_c2/photonEnergy 358 359 //Do it fast for photon energy < 1.1 MeV (cl 360 if (photonEnergy < fSmallEnergy) 361 eps = eki + (1.0-2.0*eki)*G4UniformRand(); 362 else 363 { 364 //Complete calculation 365 G4double effC = fEffectiveCharge->find(m 366 G4double alz = effC*fine_structure_const 367 G4double T = std::sqrt(2.0*eki); 368 G4double F00=(-1.774-1.210e1*alz+1.118e1 369 +(8.523+7.326e1*alz-4.441e1*alz*alz)* 370 -(1.352e1+1.211e2*alz-9.641e1*alz*alz 371 +(8.946+6.205e1*alz-6.341e1*alz*alz)*T*T*T*T 372 373 G4double F0b = fScreeningFunction->find( 374 G4double g0 = F0b + F00; 375 G4double invRad = fMaterialInvScreeningR 376 G4double bmin = 4.0*eki/invRad; 377 std::pair<G4double,G4double> scree = Ge 378 G4double g1 = scree.first; 379 G4double g2 = scree.second; 380 G4double g1min = g1+g0; 381 G4double g2min = g2+g0; 382 G4double xr = 0.5-eki; 383 G4double a1 = 2.*g1min*xr*xr/3.; 384 G4double p1 = a1/(a1+g2min); 385 386 G4bool loopAgain = false; 387 //Random sampling of eps 388 do{ 389 loopAgain = false; 390 if (G4UniformRand() <= p1) 391 { 392 G4double ru2m1 = 2.0*G4UniformRand()-1. 393 if (ru2m1 < 0) 394 eps = 0.5-xr*std::pow(std::abs(ru2m1), 395 else 396 eps = 0.5+xr*std::pow(ru2m1,1./3.); 397 G4double B = eki/(invRad*eps*(1.0-eps)); 398 scree = GetScreeningFunctions(B); 399 g1 = scree.first; 400 g1 = std::max(g1+g0,0.); 401 if (G4UniformRand()*g1min > g1) 402 loopAgain = true; 403 } 404 else 405 { 406 eps = eki+2.0*xr*G4UniformRand(); 407 G4double B = eki/(invRad*eps*(1.0-eps)); 408 scree = GetScreeningFunctions(B); 409 g2 = scree.second; 410 g2 = std::max(g2+g0,0.); 411 if (G4UniformRand()*g2min > g2) 412 loopAgain = true; 413 } 414 }while(loopAgain); 415 } 416 if (fVerboseLevel > 4) 417 G4cout << "Sampled eps = " << eps << G4end 418 419 G4double electronTotEnergy = eps*photonEnerg 420 G4double positronTotEnergy = (1.0-eps)*photo 421 422 // Scattered electron (positron) angles. ( Z 423 424 //electron kinematics 425 G4double electronKineEnergy = std::max(0.,el 426 G4double costheta_el = G4UniformRand()*2.0-1 427 G4double kk = std::sqrt(electronKineEnergy*( 428 costheta_el = (costheta_el*electronTotEnergy 429 G4double phi_el = twopi * G4UniformRand() ; 430 G4double dirX_el = std::sqrt(1.-costheta_el* 431 G4double dirY_el = std::sqrt(1.-costheta_el* 432 G4double dirZ_el = costheta_el; 433 434 //positron kinematics 435 G4double positronKineEnergy = std::max(0.,po 436 G4double costheta_po = G4UniformRand()*2.0-1 437 kk = std::sqrt(positronKineEnergy*(positronK 438 costheta_po = (costheta_po*positronTotEnergy 439 G4double phi_po = twopi * G4UniformRand() ; 440 G4double dirX_po = std::sqrt(1.-costheta_po* 441 G4double dirY_po = std::sqrt(1.-costheta_po* 442 G4double dirZ_po = costheta_po; 443 444 // Kinematics of the created pair: 445 // the electron and positron are assumed to 446 // distribution with respect to the Z axis a 447 G4double localEnergyDeposit = 0. ; 448 449 if (electronKineEnergy > 0.0) 450 { 451 G4ThreeVector electronDirection ( dirX_e 452 electronDirection.rotateUz(photonDirecti 453 G4DynamicParticle* electron = new G4Dyna 454 electronDirection, 455 electronKineEnergy); 456 fvect->push_back(electron); 457 } 458 else 459 { 460 localEnergyDeposit += electronKineEnergy 461 electronKineEnergy = 0; 462 } 463 464 //Generate the positron. Real particle in an 465 //threshold, produce it at rest 466 if (positronKineEnergy < 0.0) 467 { 468 localEnergyDeposit += positronKineEnergy 469 positronKineEnergy = 0; //produce it at 470 } 471 G4ThreeVector positronDirection(dirX_po,dirY 472 positronDirection.rotateUz(photonDirection); 473 G4DynamicParticle* positron = new G4DynamicP 474 positronDirection, positronK 475 fvect->push_back(positron); 476 477 //Add rest of energy to the local energy dep 478 fParticleChange->ProposeLocalEnergyDeposit(l 479 480 if (fVerboseLevel > 1) 481 { 482 G4cout << "----------------------------- 483 G4cout << "Energy balance from G4Penelop 484 G4cout << "Incoming photon energy: " << 485 G4cout << "----------------------------- 486 if (electronKineEnergy) 487 G4cout << "Electron (explicitly produced) " 488 << G4endl; 489 if (positronKineEnergy) 490 G4cout << "Positron (not at rest) " << posit 491 G4cout << "Rest masses of e+/- " << 2.0* 492 if (localEnergyDeposit) 493 G4cout << "Local energy deposit " << localEn 494 G4cout << "Total final state: " << (elec 495 localEnergyDeposit+2.0*electron_ma 496 " keV" << G4endl; 497 G4cout << "----------------------------- 498 } 499 if (fVerboseLevel > 0) 500 { 501 G4double energyDiff = std::fabs(electron 502 localEnergyDeposit+2.0*electron_ 503 if (energyDiff > 0.05*keV) 504 G4cout << "Warning from G4PenelopeGammaConve 505 << (electronKineEnergy+positronKineEn 506 localEnergyDeposit+2.0*electron_mass_c2 507 << " keV (final) vs. " << photonEnerg 508 } 509 } 510 511 //....oooOO0OOooo........oooOO0OOooo........oo 512 513 void G4PenelopeGammaConversionModel::ReadDataF 514 { 515 if (!IsMaster()) 516 //Should not be here! 517 G4Exception("G4PenelopeGammaConversionMode 518 "em0100",FatalException,"Worker thread in 519 520 if (fVerboseLevel > 2) 521 { 522 G4cout << "G4PenelopeGammaConversionMode 523 G4cout << "Going to read Gamma Conversio 524 } 525 526 const char* path = G4FindDataDir("G4LEDATA 527 if(!path) 528 { 529 G4String excep = 530 "G4PenelopeGammaConversionModel - G4LEDATA e 531 G4Exception("G4PenelopeGammaConversionMo 532 "em0006",FatalException,excep); 533 return; 534 } 535 536 /* 537 Read the cross section file 538 */ 539 std::ostringstream ost; 540 if (Z>9) 541 ost << path << "/penelope/pairproduction/p 542 else 543 ost << path << "/penelope/pairproduction/p 544 std::ifstream file(ost.str().c_str()); 545 if (!file.is_open()) 546 { 547 G4String excep = "G4PenelopeGammaConvers 548 G4String(ost.str()) + " not found!"; 549 G4Exception("G4PenelopeGammaConversionMo 550 "em0003",FatalException,excep); 551 } 552 553 //I have to know in advance how many points 554 //to initialize the G4PhysicsFreeVector() 555 std::size_t ndata=0; 556 G4String line; 557 while( getline(file, line) ) 558 ndata++; 559 ndata -= 1; //remove one header line 560 561 file.clear(); 562 file.close(); 563 file.open(ost.str().c_str()); 564 G4int readZ =0; 565 file >> readZ; 566 567 if (fVerboseLevel > 3) 568 G4cout << "Element Z=" << Z << G4endl; 569 570 //check the right file is opened. 571 if (readZ != Z) 572 { 573 G4ExceptionDescription ed; 574 ed << "Corrupted data file for Z=" << Z 575 G4Exception("G4PenelopeGammaConversionMo 576 "em0005",FatalException,ed); 577 } 578 579 fLogAtomicCrossSection[Z] = new G4PhysicsFre 580 G4double ene=0,xs=0; 581 for (std::size_t i=0;i<ndata;++i) 582 { 583 file >> ene >> xs; 584 //dimensional quantities 585 ene *= eV; 586 xs *= barn; 587 if (xs < 1e-40*cm2) //protection against 588 xs = 1e-40*cm2; 589 fLogAtomicCrossSection[Z]->PutValue(i,G4 590 } 591 file.close(); 592 593 return; 594 } 595 596 //....oooOO0OOooo........oooOO0OOooo........oo 597 598 void G4PenelopeGammaConversionModel::Initializ 599 { 600 // This is subroutine GPPa0 of Penelope 601 // 602 // 1) calculate the effective Z for the purp 603 // 604 G4double zeff = 0; 605 G4int intZ = 0; 606 G4int nElements = (G4int)material->GetNumber 607 const G4ElementVector* elementVector = mater 608 609 //avoid calculations if only one building el 610 if (nElements == 1) 611 { 612 zeff = (*elementVector)[0]->GetZ(); 613 intZ = (G4int) zeff; 614 } 615 else // many elements...let's do the calcula 616 { 617 const G4double* fractionVector = materia 618 619 G4double atot = 0; 620 for (G4int i=0;i<nElements;i++) 621 { 622 G4double Zelement = (*elementVector)[i]->G 623 G4double Aelement = (*elementVector)[i]->G 624 atot += Aelement*fractionVector[i]; 625 zeff += Zelement*Aelement*fractionVector[i 626 } 627 atot /= material->GetTotNbOfAtomsPerVolu 628 zeff /= (material->GetTotNbOfAtomsPerVol 629 630 intZ = (G4int) (zeff+0.25); 631 if (intZ <= 0) 632 intZ = 1; 633 if (intZ > fMaxZ) 634 intZ = fMaxZ; 635 } 636 637 if (fEffectiveCharge) 638 fEffectiveCharge->insert(std::make_pair(ma 639 640 // 641 // 2) Calculate Coulomb Correction 642 // 643 G4double alz = fine_structure_const*zeff; 644 G4double alzSquared = alz*alz; 645 G4double fc = alzSquared*(0.202059-alzSquar 646 (0.03693-alzSquared* 647 (0.00835-alzSquared*(0.00201-alzSq 648 (0.00049-alzSquared* 649 (0.00012-alzSquared*0.00003))) 650 +1.0/(alzSquared+1.0)); 651 // 652 // 3) Screening functions and low-energy cor 653 // 654 G4double matRadius = 2.0/ fAtomicScreeningRa 655 if (fMaterialInvScreeningRadius) 656 fMaterialInvScreeningRadius->insert(std::m 657 658 std::pair<G4double,G4double> myPair(0,0); 659 G4double f0a = 4.0*G4Log(fAtomicScreeningRad 660 G4double f0b = f0a - 4.0*fc; 661 myPair.first = f0a; 662 myPair.second = f0b; 663 664 if (fScreeningFunction) 665 fScreeningFunction->insert(std::make_pair( 666 667 if (fVerboseLevel > 2) 668 { 669 G4cout << "Average Z for material " << m 670 zeff << G4endl; 671 G4cout << "Effective radius for material 672 fAtomicScreeningRadius[intZ] << " m_e*c/hbar 673 matRadius << G4endl; 674 G4cout << "Screening parameters F0 for m 675 f0a << "," << f0b << G4endl; 676 } 677 return; 678 } 679 680 //....oooOO0OOooo........oooOO0OOooo........oo 681 682 std::pair<G4double,G4double> 683 G4PenelopeGammaConversionModel::GetScreeningFu 684 { 685 // This is subroutine SCHIFF of Penelope 686 // 687 // Screening Functions F1(B) and F2(B) in th 688 // section for pair production 689 // 690 std::pair<G4double,G4double> result(0.,0.); 691 G4double BSquared = B*B; 692 G4double f1 = 2.0-2.0*G4Log(1.0+BSquared); 693 G4double f2 = f1 - 6.66666666e-1; // (-2/3) 694 if (B < 1.0e-10) 695 f1 = f1-twopi*B; 696 else 697 { 698 G4double a0 = 4.0*B*std::atan(1./B); 699 f1 = f1 - a0; 700 f2 += 2.0*BSquared*(4.0-a0-3.0*G4Log((1. 701 } 702 G4double g1 = 0.5*(3.0*f1-f2); 703 G4double g2 = 0.25*(3.0*f1+f2); 704 705 result.first = g1; 706 result.second = g2; 707 708 return result; 709 } 710 711 //....oooOO0OOooo........oooOO0OOooo........oo 712 713 void G4PenelopeGammaConversionModel::SetPartic 714 { 715 if(!fParticle) { 716 fParticle = p; 717 } 718 } 719