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26 // 26 //
>> 27 // $Id: G4FissionBarrier.cc,v 1.5 2006/06/29 20:13:35 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-01-patch-01 $
>> 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 <<
31 // 21.03.2013 V.Ivanchenko redesign parameters <<
32 33
33 #include "G4FissionBarrier.hh" 34 #include "G4FissionBarrier.hh"
34 #include "G4CameronShellPlusPairingCorrections <<
35 #include "G4NuclearLevelData.hh" <<
36 #include "G4ShellCorrection.hh" <<
37 #include "G4SystemOfUnits.hh" <<
38 #include "G4Pow.hh" <<
39 35
40 G4FissionBarrier::G4FissionBarrier() << 36 G4FissionBarrier::G4FissionBarrier(const G4FissionBarrier & ) : G4VFissionBarrier()
41 { 37 {
42 SPtr = G4NuclearLevelData::GetInstance()->Ge << 38 throw G4HadronicException(__FILE__, __LINE__, "G4FissionBarrier::copy_constructor meant to not be accessable.");
43 ->GetCameronShellPlusPairingCorrections(); <<
44 } 39 }
45 40
46 G4FissionBarrier::~G4FissionBarrier() <<
47 {} <<
48 41
49 G4double << 42 const G4FissionBarrier & G4FissionBarrier::operator=(const G4FissionBarrier & )
50 G4FissionBarrier::FissionBarrier(G4int A, G4in << 43 {
51 // Compute fission barrier according with Ba << 44 throw G4HadronicException(__FILE__, __LINE__, "G4FissionBarrier::operator= meant to not be accessable.");
52 // prescription for A >= 65 << 45 return *this;
53 { <<
54 static const G4double blimit = 100.0*CLHEP:: <<
55 return (A >= 65) ? BarashenkovFissionBarrier <<
56 /(1.0 + std::sqrt(U/(G4double)(2*A))) : bl <<
57 } 46 }
58 47
59 G4double << 48 G4bool G4FissionBarrier::operator==(const G4FissionBarrier & ) const
60 G4FissionBarrier::BarashenkovFissionBarrier(G4 << 49 {
61 // Calculates Fission Barrier heights << 50 return false;
62 { << 51 }
63 // Liquid drop model parameters for << 52
64 // surface energy of a spherical nucleus << 53 G4bool G4FissionBarrier::operator!=(const G4FissionBarrier & ) const
65 static const G4double aSurf = 17.9439*CLHEP: << 54 {
66 // and coulomb energy << 55 return true;
67 static const G4double aCoul = 0.7053*CLHEP:: << 56 }
68 static const G4double k = 1.7826; << 57
69 G4int N = A - Z; << 58
70 << 59
71 // fissibility parameter << 60 G4double G4FissionBarrier::FissionBarrier(const G4int A, const G4int Z, const G4double U)
72 G4double x = (aCoul/(2.0*aSurf))*(Z*Z)/stati << 61 // Compute fission barrier according with Barashenkov's prescription for A >= 65
73 x /= (1.0 - k*(N-Z)*(N-Z)/static_cast<G4doub << 62 {
>> 63 if (A >= 65) return BarashenkovFissionBarrier(A,Z)/(1.0 + std::sqrt(U/(2.0*static_cast<G4double>(A))));
>> 64 else return 100.0*GeV;
>> 65 }
>> 66
>> 67
>> 68 G4double G4FissionBarrier::BarashenkovFissionBarrier(const G4int A, const G4int Z)
>> 69 // Calculates Fission Barrier heights
>> 70 {
>> 71 // Liquid drop model parameters for
>> 72 // surface energy of a spherical nucleus
>> 73 const G4double aSurf = 17.9439*MeV;
>> 74 // and coulomb energy
>> 75 const G4double aCoul = 0.7053*MeV;
>> 76 const G4int N = A - Z;
>> 77 const G4double k = 1.7826;
>> 78
>> 79 // fissibility parameter
>> 80 G4double x = (aCoul/(2.0*aSurf))*(static_cast<G4double>(Z)*static_cast<G4double>(Z))/static_cast<G4double>(A);
>> 81 x /= (1.0 - k*(static_cast<G4double>(N-Z)/static_cast<G4double>(A))*
>> 82 (static_cast<G4double>(N-Z)/static_cast<G4double>(A)));
74 83
75 // Liquid drop model part of Fission Barrier << 84 // Liquid drop model part of Fission Barrier
76 G4double BF0 = aSurf*G4Pow::GetInstance()->Z << 85 G4double BF0 = aSurf*std::pow(static_cast<G4double>(A),2./3.);
77 if (x <= 2./3.) { BF0 *= 0.38*(0.75 - x); } << 86 if (x <= 2./3.) BF0 *= 0.38*(3./4.-x);
78 else { BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x << 87 else BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x);
79 88
80 G4int d = N - 2*(N/2) + Z - 2*(Z/2); <<
81 89
82 G4double res = 0.0; << 90 //
83 SPtr->GetPairingCorrection(N,Z,res); << 91 G4double D = 1.248*MeV;
>> 92 D *= (static_cast<G4double>(N)-2.0*(N/2)) + (static_cast<G4double>(Z)-2.0*(Z/2));
84 93
85 static const G4double D = 1.248*CLHEP::MeV; << 94 return BF0 + D - SellPlusPairingCorrection(Z,N);
86 return BF0 + D*d - res; <<
87 } 95 }
88 96
89 97