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26 // 26 //
>> 27 // $Id: G4FissionParameters.cc,v 1.7 2009/11/19 10:30:49 vnivanch Exp $
>> 28 // GEANT4 tag $Name: geant4-09-03 $
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 //J. M. Quesada (May 2009): sigma_sym (SigmaS) tuned for spallation data.
32 //J. M. Quesada (30.10.09): retuning for IAEA 34 //J. M. Quesada (30.10.09): retuning for IAEA spallation data
33 35
34 #include "G4FissionParameters.hh" 36 #include "G4FissionParameters.hh"
35 #include "G4SystemOfUnits.hh" << 37 #include "G4HadronicException.hh"
36 38
37 G4FissionParameters::G4FissionParameters() <<
38 : A1(134),A2(141),A3((A1 + A2)*0.5),As(0.0), <<
39 SigmaS(0.),w(0.0) <<
40 {} <<
41 39
42 G4FissionParameters::~G4FissionParameters() << 40 const G4double G4FissionParameters::A1 = 134.0;
43 {} << 41 const G4double G4FissionParameters::A2 = 141.0;
44 42
45 void G4FissionParameters::DefineParameters(G4i <<
46 G4double FissionBarrier) <<
47 { <<
48 // to avoid usage of units <<
49 G4double U = std::min(200., ExEnergy/CLHEP:: <<
50 43
51 As = A*0.5; << 44 G4FissionParameters::G4FissionParameters(const G4int A, const G4int Z, const G4double ExEnergy,
>> 45 const G4double FissionBarrier)
>> 46 {
>> 47 G4double U = ExEnergy;
52 48
53 if (A <= 235) { Sigma2 = 5.6; } << 49 As = A/2.0;
54 else { Sigma2 = 5.6 + 0.096*(A-235) <<
55 <<
56 Sigma1 = 0.5*Sigma2; <<
57 <<
58 //JMQ 310509 <<
59 // if (SigmaS > 20.0) SigmaS = 20.0; <<
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 50
83 G4double x3 = (As-A3)/SigmaS; << 51 if (A <= 235) Sigma2 = 5.6; // MeV
84 G4double FsymA1A2 = LocalExp(x3); << 52 else Sigma2 = 5.6 + 0.096*(A-235); // MeV
85 << 53
86 G4double w1 = std::max(1.03*wa - FasymAsym << 54 Sigma1 = 0.5*Sigma2; // MeV
87 G4double w2 = std::max(1.0 - FsymA1A2*wa, << 55
>> 56 SigmaS = std::exp(0.00553*U/MeV + 2.1386); // MeV
88 57
89 w = w1/w2; << 58 //JMQ 310509
>> 59 // if (SigmaS > 20.0) SigmaS = 20.0;
>> 60 // SigmaS*=1.3;
>> 61 //JMQ 301009: retuning (after CEM transition prob.have been chosen as default)
>> 62 SigmaS*=0.8;
>> 63 //
>> 64
>> 65 G4double FasymAsym = 2.0*std::exp(-((A2-As)*(A2-As))/(2.0*Sigma2*Sigma2)) +
>> 66 std::exp(-((A1-As)*(A1-As))/(2.0*Sigma1*Sigma1));
>> 67
>> 68 G4double FsymA1A2 = std::exp(-((As-(A1+A2)/2.0)*(As-(A1+A2)/2.0))/(2.0*SigmaS*SigmaS));
>> 69
>> 70
>> 71 G4double wa = 0.0;
>> 72 w = 0.0;
>> 73 if (Z >= 90) { // Z >= 90
>> 74 if (U <= 16.25) wa = std::exp(0.5385*U/MeV-9.9564); // U <= 16.25 MeV
>> 75 else wa = std::exp(0.09197*U/MeV-2.7003); // U > 16.25 MeV
>> 76 } else if (Z == 89) { // Z == 89
>> 77 wa = std::exp(0.09197*U-1.0808);
>> 78 } else if (Z >= 82) { // 82 <= Z <= 88
>> 79 G4double X = FissionBarrier - 7.5*MeV;
>> 80 if (X < 0.0) X = 0.0;
>> 81 wa = std::exp(0.09197*(U-X)/MeV-1.0808);
>> 82 } else { // Z < 82
>> 83 w = 1001.0;
>> 84 }
>> 85
>> 86 if (w == 0.0) {
>> 87 G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001);
>> 88 G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001);
>> 89
>> 90 w = w1/w2;
90 91
91 if (A < 227) { w *= G4Exp(0.3*(227-A)); } << 92 if (82 <= Z && Z < 89 && A < 227) w *= std::exp(0.3*(227-A));
92 } << 93 }
>> 94
>> 95 }
>> 96
>> 97
>> 98 G4FissionParameters::G4FissionParameters(const G4FissionParameters &)
>> 99 {
>> 100 throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::copy_constructor meant to not be accessable");
>> 101 }
>> 102
>> 103
>> 104 const G4FissionParameters & G4FissionParameters::operator=(const G4FissionParameters &)
>> 105 {
>> 106 throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::operator= meant to not be accessable");
>> 107 return *this;
>> 108 }
>> 109
>> 110
>> 111 G4bool G4FissionParameters::operator==(const G4FissionParameters &) const
>> 112 {
>> 113 return false;
>> 114 }
>> 115
>> 116 G4bool G4FissionParameters::operator!=(const G4FissionParameters &) const
>> 117 {
>> 118 return true;
93 } 119 }
94 120
95 121
96 122