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26 // 26 //
27 // Hadronic Process: Nuclear De-excitations 27 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Oct 1998) 28 // by V. Lara (Oct 1998)
29 // 29 //
30 // 17.11.2010 V.Ivanchenko cleanup and add usa 30 // 17.11.2010 V.Ivanchenko cleanup and add usage of G4Pow
31 // 21.03.2013 V.Ivanchenko redesign parameters 31 // 21.03.2013 V.Ivanchenko redesign parameters classes
32 32
33 #include "G4FissionBarrier.hh" 33 #include "G4FissionBarrier.hh"
34 #include "G4CameronShellPlusPairingCorrections <<
35 #include "G4NuclearLevelData.hh" 34 #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 = G4NuclearLevelData::GetInstance()->GetShellCorrection()
43 ->GetCameronShellPlusPairingCorrections(); 42 ->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) const
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 static const G4double blimit = 100.0*CLHEP::GeV;
55 return (A >= 65) ? BarashenkovFissionBarrier << 54 return (A < 65) ? blimit :
56 /(1.0 + std::sqrt(U/(G4double)(2*A))) : bl << 55 BarashenkovFissionBarrier(A,Z)/(1.0 + std::sqrt(U/(G4double)(2*A)));
57 } 56 }
58 57
59 G4double 58 G4double
60 G4FissionBarrier::BarashenkovFissionBarrier(G4 59 G4FissionBarrier::BarashenkovFissionBarrier(G4int A, G4int Z) const
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*CLHEP::MeV;
66 // and coulomb energy 65 // and coulomb energy
67 static const G4double aCoul = 0.7053*CLHEP:: 66 static const G4double aCoul = 0.7053*CLHEP::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 G4int d = N - 2*(N/2) + Z - 2*(Z/2);
81 80
82 G4double res = 0.0; 81 G4double res = 0.0;
83 SPtr->GetPairingCorrection(N,Z,res); 82 SPtr->GetPairingCorrection(N,Z,res);
84 83
85 static const G4double D = 1.248*CLHEP::MeV; 84 static const G4double D = 1.248*CLHEP::MeV;
86 return BF0 + D*d - res; 85 return BF0 + D*d - res;
87 } 86 }
88 87
89 88