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>> 27 // $Id: G4FissionBarrier.cc,v 1.8 2010-11-17 20:22:46 vnivanch Exp $
>> 28 // GEANT4 tag $Name: geant4-09-04-patch-02 $
>> 29 //
27 // Hadronic Process: Nuclear De-excitations 30 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Oct 1998) 31 // by V. Lara (Oct 1998)
29 // 32 //
30 // 17.11.2010 V.Ivanchenko cleanup and add usa 33 // 17.11.2010 V.Ivanchenko cleanup and add usage of G4Pow
31 // 21.03.2013 V.Ivanchenko redesign parameters <<
32 34
33 #include "G4FissionBarrier.hh" 35 #include "G4FissionBarrier.hh"
34 #include "G4CameronShellPlusPairingCorrections <<
35 #include "G4NuclearLevelData.hh" <<
36 #include "G4ShellCorrection.hh" <<
37 #include "G4SystemOfUnits.hh" <<
38 #include "G4Pow.hh" 36 #include "G4Pow.hh"
39 37
40 G4FissionBarrier::G4FissionBarrier() 38 G4FissionBarrier::G4FissionBarrier()
41 { << 39 {}
42 SPtr = G4NuclearLevelData::GetInstance()->Ge <<
43 ->GetCameronShellPlusPairingCorrections(); <<
44 } <<
45 40
46 G4FissionBarrier::~G4FissionBarrier() 41 G4FissionBarrier::~G4FissionBarrier()
47 {} 42 {}
48 43
49 G4double 44 G4double
50 G4FissionBarrier::FissionBarrier(G4int A, G4in << 45 G4FissionBarrier::FissionBarrier(G4int A, G4int Z, G4double U)
51 // Compute fission barrier according with Ba 46 // Compute fission barrier according with Barashenkov's
52 // prescription for A >= 65 47 // prescription for A >= 65
53 { 48 {
54 static const G4double blimit = 100.0*CLHEP:: << 49 if (A >= 65) {
55 return (A >= 65) ? BarashenkovFissionBarrier << 50 return BarashenkovFissionBarrier(A,Z)/(1.0 + std::sqrt(U/(2.0*A)));
56 /(1.0 + std::sqrt(U/(G4double)(2*A))) : bl << 51 } else { return 100.0*GeV; }
57 } 52 }
58 53
59 G4double 54 G4double
60 G4FissionBarrier::BarashenkovFissionBarrier(G4 << 55 G4FissionBarrier::BarashenkovFissionBarrier(G4int A, G4int Z)
61 // Calculates Fission Barrier heights 56 // Calculates Fission Barrier heights
62 { 57 {
63 // Liquid drop model parameters for 58 // Liquid drop model parameters for
64 // surface energy of a spherical nucleus 59 // surface energy of a spherical nucleus
65 static const G4double aSurf = 17.9439*CLHEP: << 60 const G4double aSurf = 17.9439*MeV;
66 // and coulomb energy 61 // and coulomb energy
67 static const G4double aCoul = 0.7053*CLHEP:: << 62 const G4double aCoul = 0.7053*MeV;
68 static const G4double k = 1.7826; << 63 const G4double k = 1.7826;
69 G4int N = A - Z; 64 G4int N = A - Z;
70 65
71 // fissibility parameter 66 // fissibility parameter
72 G4double x = (aCoul/(2.0*aSurf))*(Z*Z)/stati 67 G4double x = (aCoul/(2.0*aSurf))*(Z*Z)/static_cast<G4double>(A);
73 x /= (1.0 - k*(N-Z)*(N-Z)/static_cast<G4doub 68 x /= (1.0 - k*(N-Z)*(N-Z)/static_cast<G4double>(A*A));
74 69
75 // Liquid drop model part of Fission Barrier 70 // Liquid drop model part of Fission Barrier
76 G4double BF0 = aSurf*G4Pow::GetInstance()->Z 71 G4double BF0 = aSurf*G4Pow::GetInstance()->Z23(A);
77 if (x <= 2./3.) { BF0 *= 0.38*(0.75 - x); } << 72 if (x <= 2./3.) { BF0 *= 0.38*(3./4.-x); }
78 else { BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x 73 else { BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x); }
79 74
80 G4int d = N - 2*(N/2) + Z - 2*(Z/2); << 75 //
81 << 76 G4double D = 1.248*MeV;
82 G4double res = 0.0; << 77 D *= (N - 2*(N/2) + Z - 2*(Z/2));
83 SPtr->GetPairingCorrection(N,Z,res); <<
84 78
85 static const G4double D = 1.248*CLHEP::MeV; << 79 return BF0 + D - SellPlusPairingCorrection(Z,N);
86 return BF0 + D*d - res; <<
87 } 80 }
88 81
89 82