Geant4 Cross Reference |
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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 // $Id: G4FissionBarrier.cc 68724 2013-04-05 09:26:32Z gcosmo $ 26 // 27 // 27 // Hadronic Process: Nuclear De-excitations 28 // Hadronic Process: Nuclear De-excitations 28 // by V. Lara (Oct 1998) 29 // by V. Lara (Oct 1998) 29 // 30 // 30 // 17.11.2010 V.Ivanchenko cleanup and add usa 31 // 17.11.2010 V.Ivanchenko cleanup and add usage of G4Pow 31 // 21.03.2013 V.Ivanchenko redesign parameters 32 // 21.03.2013 V.Ivanchenko redesign parameters classes 32 33 33 #include "G4FissionBarrier.hh" 34 #include "G4FissionBarrier.hh" 34 #include "G4CameronShellPlusPairingCorrections << 35 #include "G4NuclearLevelData.hh" << 36 #include "G4ShellCorrection.hh" 35 #include "G4ShellCorrection.hh" 37 #include "G4SystemOfUnits.hh" 36 #include "G4SystemOfUnits.hh" 38 #include "G4Pow.hh" 37 #include "G4Pow.hh" 39 38 40 G4FissionBarrier::G4FissionBarrier() 39 G4FissionBarrier::G4FissionBarrier() 41 { 40 { 42 SPtr = G4NuclearLevelData::GetInstance()->Ge << 41 SPtr = 43 ->GetCameronShellPlusPairingCorrections(); << 42 G4ShellCorrection::GetInstance()->GetCameronShellPlusPairingCorrections(); 44 } 43 } 45 44 46 G4FissionBarrier::~G4FissionBarrier() 45 G4FissionBarrier::~G4FissionBarrier() 47 {} 46 {} 48 47 49 G4double 48 G4double 50 G4FissionBarrier::FissionBarrier(G4int A, G4in << 49 G4FissionBarrier::FissionBarrier(G4int A, G4int Z, G4double U) 51 // Compute fission barrier according with Ba 50 // Compute fission barrier according with Barashenkov's 52 // prescription for A >= 65 51 // prescription for A >= 65 53 { 52 { 54 static const G4double blimit = 100.0*CLHEP:: << 53 if (A >= 65) { 55 return (A >= 65) ? BarashenkovFissionBarrier << 54 return BarashenkovFissionBarrier(A,Z)/(1.0 + std::sqrt(U/(2.0*A))); 56 /(1.0 + std::sqrt(U/(G4double)(2*A))) : bl << 55 } else { return 100.0*GeV; } 57 } 56 } 58 57 59 G4double 58 G4double 60 G4FissionBarrier::BarashenkovFissionBarrier(G4 << 59 G4FissionBarrier::BarashenkovFissionBarrier(G4int A, G4int Z) 61 // Calculates Fission Barrier heights 60 // Calculates Fission Barrier heights 62 { 61 { 63 // Liquid drop model parameters for 62 // Liquid drop model parameters for 64 // surface energy of a spherical nucleus 63 // surface energy of a spherical nucleus 65 static const G4double aSurf = 17.9439*CLHEP: << 64 static const G4double aSurf = 17.9439*MeV; 66 // and coulomb energy 65 // and coulomb energy 67 static const G4double aCoul = 0.7053*CLHEP:: << 66 static const G4double aCoul = 0.7053*MeV; 68 static const G4double k = 1.7826; 67 static const G4double k = 1.7826; 69 G4int N = A - Z; 68 G4int N = A - Z; 70 69 71 // fissibility parameter 70 // fissibility parameter 72 G4double x = (aCoul/(2.0*aSurf))*(Z*Z)/stati 71 G4double x = (aCoul/(2.0*aSurf))*(Z*Z)/static_cast<G4double>(A); 73 x /= (1.0 - k*(N-Z)*(N-Z)/static_cast<G4doub 72 x /= (1.0 - k*(N-Z)*(N-Z)/static_cast<G4double>(A*A)); 74 73 75 // Liquid drop model part of Fission Barrier 74 // Liquid drop model part of Fission Barrier 76 G4double BF0 = aSurf*G4Pow::GetInstance()->Z 75 G4double BF0 = aSurf*G4Pow::GetInstance()->Z23(A); 77 if (x <= 2./3.) { BF0 *= 0.38*(0.75 - x); } << 76 if (x <= 2./3.) { BF0 *= 0.38*(3./4.-x); } 78 else { BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x 77 else { BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x); } 79 78 80 G4int d = N - 2*(N/2) + Z - 2*(Z/2); << 79 // >> 80 G4double D = 1.248*MeV; >> 81 D *= (N - 2*(N/2) + Z - 2*(Z/2)); 81 82 82 G4double res = 0.0; << 83 return BF0 + D - SellPlusPairingCorrection(Z,N); 83 SPtr->GetPairingCorrection(N,Z,res); << 84 << 85 static const G4double D = 1.248*CLHEP::MeV; << 86 return BF0 + D*d - res; << 87 } 84 } 88 85 89 86