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 // 26 // 27 // 27 // 28 // Hadronic Process: Nuclear De-excitations 28 // Hadronic Process: Nuclear De-excitations 29 // by V. Lara (Oct 1998) 29 // by V. Lara (Oct 1998) 30 // 30 // 31 // 31 // 32 // J.M.Quesada (14 february 2009) bug fixed in 32 // J.M.Quesada (14 february 2009) bug fixed in fission width: missing 33 // parenthesis 33 // parenthesis in the denominator 34 34 35 35 36 #include "G4FissionProbability.hh" 36 #include "G4FissionProbability.hh" 37 #include "G4PhysicalConstants.hh" 37 #include "G4PhysicalConstants.hh" 38 #include "G4NuclearLevelData.hh" 38 #include "G4NuclearLevelData.hh" 39 #include "G4PairingCorrection.hh" 39 #include "G4PairingCorrection.hh" 40 #include "G4EvaporationLevelDensityParameter.h 40 #include "G4EvaporationLevelDensityParameter.hh" 41 #include "G4FissionLevelDensityParameter.hh" 41 #include "G4FissionLevelDensityParameter.hh" 42 #include "G4Exp.hh" 42 #include "G4Exp.hh" 43 43 44 G4FissionProbability::G4FissionProbability() : 44 G4FissionProbability::G4FissionProbability() : 45 G4VEmissionProbability(0, 0), 45 G4VEmissionProbability(0, 0), 46 theEvapLDP(new G4EvaporationLevelDensityPara 46 theEvapLDP(new G4EvaporationLevelDensityParameter), 47 theFissLDP(new G4FissionLevelDensityParamete 47 theFissLDP(new G4FissionLevelDensityParameter), 48 ownEvapLDP(true), 48 ownEvapLDP(true), 49 ownFissLDP(true) 49 ownFissLDP(true) 50 { 50 { 51 fPairCorr = G4NuclearLevelData::GetInstance( 51 fPairCorr = G4NuclearLevelData::GetInstance()->GetPairingCorrection(); 52 } 52 } 53 53 54 G4FissionProbability::~G4FissionProbability() 54 G4FissionProbability::~G4FissionProbability() 55 { 55 { 56 if (ownEvapLDP) delete theEvapLDP; 56 if (ownEvapLDP) delete theEvapLDP; 57 if (ownFissLDP) delete theFissLDP; 57 if (ownFissLDP) delete theFissLDP; 58 } 58 } 59 59 60 G4double 60 G4double 61 G4FissionProbability::EmissionProbability(cons 61 G4FissionProbability::EmissionProbability(const G4Fragment & fragment, 62 G4double MaximalKineticEnergy) 62 G4double MaximalKineticEnergy) 63 // Compute integrated probability of fission 63 // Compute integrated probability of fission channel 64 { 64 { 65 if (MaximalKineticEnergy <= 0.0) { return 0. 65 if (MaximalKineticEnergy <= 0.0) { return 0.0; } 66 G4int A = fragment.GetA_asInt(); 66 G4int A = fragment.GetA_asInt(); 67 G4int Z = fragment.GetZ_asInt(); 67 G4int Z = fragment.GetZ_asInt(); 68 G4double U = fragment.GetExcitationEnergy(); 68 G4double U = fragment.GetExcitationEnergy(); 69 69 70 G4double Ucompound = U - fPairCorr->GetPairi 70 G4double Ucompound = U - fPairCorr->GetPairingCorrection(A,Z); 71 G4double Ufission = U - fPairCorr->GetFissio 71 G4double Ufission = U - fPairCorr->GetFissionPairingCorrection(A,Z); 72 if(Ucompound < 0.0 || Ufission < 0.0) { retu 72 if(Ucompound < 0.0 || Ufission < 0.0) { return 0.0; } 73 73 74 G4double SystemEntropy = 74 G4double SystemEntropy = 75 2.0*std::sqrt(theEvapLDP->LevelDensityPara 75 2.0*std::sqrt(theEvapLDP->LevelDensityParameter(A,Z,Ucompound)*Ucompound); 76 76 77 G4double afission = theFissLDP->LevelDensity 77 G4double afission = theFissLDP->LevelDensityParameter(A,Z,Ufission); 78 78 79 G4double Cf = 2.0*std::sqrt(afission*Maximal 79 G4double Cf = 2.0*std::sqrt(afission*MaximalKineticEnergy); 80 G4double Exp1 = (SystemEntropy <= 160.0) ? G 80 G4double Exp1 = (SystemEntropy <= 160.0) ? G4Exp(-SystemEntropy) : 0.0; 81 G4double Exp2 = (SystemEntropy-Cf <= 160.0) 81 G4double Exp2 = (SystemEntropy-Cf <= 160.0) ? G4Exp(-SystemEntropy+Cf) : 0.0; 82 82 83 // JMQ 14/02/09 BUG fixed in fission probabi 83 // JMQ 14/02/09 BUG fixed in fission probability (missing parenthesis 84 // at denominator) 84 // at denominator) 85 G4double probability = (Exp1 + (Cf-1.0)*Exp2 85 G4double probability = (Exp1 + (Cf-1.0)*Exp2) / (4.0*pi*afission); 86 86 87 return probability; 87 return probability; 88 } 88 } 89 89 90 90