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26 // 26 //
>> 27 // $Id: G4FissionParameters.cc,v 1.5 2006/06/29 20:13:39 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-02 $
27 // 29 //
28 // Hadronic Process: Nuclear De-excitations 30 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara (Oct 1998) 31 // by V. Lara (Oct 1998)
30 // 32 //
31 //J. M. Quesada (May 2009): sigma_sym (SigmaS) << 33
32 //J. M. Quesada (30.10.09): retuning for IAEA <<
33 34
34 #include "G4FissionParameters.hh" 35 #include "G4FissionParameters.hh"
35 #include "G4SystemOfUnits.hh" << 36 #include "G4HadronicException.hh"
36 37
37 G4FissionParameters::G4FissionParameters() <<
38 : A1(134),A2(141),A3((A1 + A2)*0.5),As(0.0), <<
39 SigmaS(0.),w(0.0) <<
40 {} <<
41 38
42 G4FissionParameters::~G4FissionParameters() << 39 const G4double G4FissionParameters::A1 = 134.0;
43 {} << 40 const G4double G4FissionParameters::A2 = 141.0;
44 41
45 void G4FissionParameters::DefineParameters(G4i <<
46 G4double FissionBarrier) <<
47 { <<
48 // to avoid usage of units <<
49 G4double U = std::min(200., ExEnergy/CLHEP:: <<
50 42
51 As = A*0.5; << 43 G4FissionParameters::G4FissionParameters(const G4int A, const G4int Z, const G4double ExEnergy,
>> 44 const G4double FissionBarrier)
>> 45 {
>> 46 G4double U = ExEnergy;
>> 47
>> 48 As = A/2.0;
>> 49
>> 50 if (A <= 235) Sigma2 = 5.6; // MeV
>> 51 else Sigma2 = 5.6 + 0.096*(A-235); // MeV
>> 52
>> 53 Sigma1 = 0.5*Sigma2; // MeV
>> 54
>> 55 SigmaS = std::exp(0.00553*U/MeV + 2.1386); // MeV
>> 56 if (SigmaS > 20.0) SigmaS = 20.0;
>> 57
>> 58 G4double FasymAsym = 2.0*std::exp(-((A2-As)*(A2-As))/(2.0*Sigma2*Sigma2)) +
>> 59 std::exp(-((A1-As)*(A1-As))/(2.0*Sigma1*Sigma1));
>> 60
>> 61 G4double FsymA1A2 = std::exp(-((As-(A1+A2)/2.0)*(As-(A1+A2)/2.0))/(2.0*SigmaS*SigmaS));
>> 62
>> 63
>> 64 G4double wa = 0.0;
>> 65 w = 0.0;
>> 66 if (Z >= 90) { // Z >= 90
>> 67 if (U <= 16.25) wa = std::exp(0.5385*U/MeV-9.9564); // U <= 16.25 MeV
>> 68 else wa = std::exp(0.09197*U/MeV-2.7003); // U > 16.25 MeV
>> 69 } else if (Z == 89) { // Z == 89
>> 70 wa = std::exp(0.09197*U-1.0808);
>> 71 } else if (Z >= 82) { // 82 <= Z <= 88
>> 72 G4double X = FissionBarrier - 7.5*MeV;
>> 73 if (X < 0.0) X = 0.0;
>> 74 wa = std::exp(0.09197*(U-X)/MeV-1.0808);
>> 75 } else { // Z < 82
>> 76 w = 1001.0;
>> 77 }
>> 78
>> 79 if (w == 0.0) {
>> 80 G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001);
>> 81 G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001);
52 82
53 if (A <= 235) { Sigma2 = 5.6; } << 83 w = w1/w2;
54 else { Sigma2 = 5.6 + 0.096*(A-235) <<
55 84
56 Sigma1 = 0.5*Sigma2; << 85 if (82 <= Z && Z < 89 && A < 227) w *= std::exp(0.3*(227-A));
57 << 86 }
58 //JMQ 310509 << 87
59 // if (SigmaS > 20.0) SigmaS = 20.0; << 88 }
60 // SigmaS*=1.3; <<
61 //JMQ 301009: retuning (after CEM transition <<
62 SigmaS = 0.8*G4Exp(0.00553*U + 2.1386); <<
63 <<
64 G4double wa = 0.0; <<
65 w = 0.0; <<
66 if (Z >= 90) { <<
67 if (U <= 16.25) { wa = G4Exp(0.5385*U-9.95 <<
68 else { wa = G4Exp(0.09197*U-2.7 <<
69 } else if (Z == 89) { <<
70 wa = G4Exp(0.09197*U-1.0808); <<
71 } else if (Z >= 82) { <<
72 G4double X = std::max(0.0, FissionBarrier/ <<
73 wa = G4Exp(0.09197*(U-X) - 1.0808); <<
74 } else { // Z < 82 <<
75 w = 1001.0; <<
76 } <<
77 <<
78 if (Z >= 82) { <<
79 G4double x1 = (A1-As)/Sigma1; <<
80 G4double x2 = (A2-As)/Sigma2; <<
81 G4double FasymAsym = 2*LocalExp(x2) + Loca <<
82 <<
83 G4double x3 = (As-A3)/SigmaS; <<
84 G4double FsymA1A2 = LocalExp(x3); <<
85 89
86 G4double w1 = std::max(1.03*wa - FasymAsym << 90
87 G4double w2 = std::max(1.0 - FsymA1A2*wa, << 91 G4FissionParameters::G4FissionParameters(const G4FissionParameters &)
88 << 92 {
89 w = w1/w2; << 93 throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::copy_constructor meant to not be accessable");
90 << 94 }
91 if (A < 227) { w *= G4Exp(0.3*(227-A)); } << 95
92 } << 96
>> 97 const G4FissionParameters & G4FissionParameters::operator=(const G4FissionParameters &)
>> 98 {
>> 99 throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::operator= meant to not be accessable");
>> 100 return *this;
>> 101 }
>> 102
>> 103
>> 104 G4bool G4FissionParameters::operator==(const G4FissionParameters &) const
>> 105 {
>> 106 return false;
>> 107 }
>> 108
>> 109 G4bool G4FissionParameters::operator!=(const G4FissionParameters &) const
>> 110 {
>> 111 return true;
93 } 112 }
94 113
95 114
96 115