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>> 27 // $Id: G4FissionParameters.cc 89550 2015-04-17 08:38:15Z gcosmo $
27 // 28 //
28 // Hadronic Process: Nuclear De-excitations 29 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara (Oct 1998) 30 // by V. Lara (Oct 1998)
30 // 31 //
31 //J. M. Quesada (May 2009): sigma_sym (SigmaS) 32 //J. M. Quesada (May 2009): sigma_sym (SigmaS) tuned for spallation data.
32 //J. M. Quesada (30.10.09): retuning for IAEA 33 //J. M. Quesada (30.10.09): retuning for IAEA spallation data
33 34
34 #include "G4FissionParameters.hh" 35 #include "G4FissionParameters.hh"
35 #include "G4SystemOfUnits.hh" 36 #include "G4SystemOfUnits.hh"
>> 37 #include "G4Exp.hh"
36 38
37 G4FissionParameters::G4FissionParameters() 39 G4FissionParameters::G4FissionParameters()
38 : A1(134),A2(141),A3((A1 + A2)*0.5),As(0.0), 40 : A1(134),A2(141),A3((A1 + A2)*0.5),As(0.0),Sigma1(0.0),Sigma2(0.0),
39 SigmaS(0.),w(0.0) 41 SigmaS(0.),w(0.0)
40 {} 42 {}
41 43
42 G4FissionParameters::~G4FissionParameters() 44 G4FissionParameters::~G4FissionParameters()
43 {} 45 {}
44 46
45 void G4FissionParameters::DefineParameters(G4i 47 void G4FissionParameters::DefineParameters(G4int A, G4int Z, G4double ExEnergy,
46 G4double FissionBarrier) 48 G4double FissionBarrier)
47 { 49 {
48 // to avoid usage of units 50 // to avoid usage of units
49 G4double U = std::min(200., ExEnergy/CLHEP:: << 51 G4double U = ExEnergy/CLHEP::MeV;
50 52
51 As = A*0.5; 53 As = A*0.5;
52 54
53 if (A <= 235) { Sigma2 = 5.6; } 55 if (A <= 235) { Sigma2 = 5.6; }
54 else { Sigma2 = 5.6 + 0.096*(A-235) 56 else { Sigma2 = 5.6 + 0.096*(A-235); }
55 57
56 Sigma1 = 0.5*Sigma2; 58 Sigma1 = 0.5*Sigma2;
57 59
58 //JMQ 310509 60 //JMQ 310509
59 // if (SigmaS > 20.0) SigmaS = 20.0; 61 // if (SigmaS > 20.0) SigmaS = 20.0;
60 // SigmaS*=1.3; 62 // SigmaS*=1.3;
61 //JMQ 301009: retuning (after CEM transition 63 //JMQ 301009: retuning (after CEM transition prob.have been chosen as default)
62 SigmaS = 0.8*G4Exp(0.00553*U + 2.1386); 64 SigmaS = 0.8*G4Exp(0.00553*U + 2.1386);
63 << 65
>> 66 G4double x1 = (A1-As)/Sigma1;
>> 67 G4double x2 = (A2-As)/Sigma2;
>> 68 G4double FasymAsym = 2*G4Exp(-0.5*x2*x2) + G4Exp(-0.5*x1*x1);
>> 69
>> 70 G4double x3 = (As-A3)/SigmaS;
>> 71 G4double FsymA1A2 = G4Exp(-0.5*x3*x3);
>> 72
64 G4double wa = 0.0; 73 G4double wa = 0.0;
65 w = 0.0; 74 w = 0.0;
66 if (Z >= 90) { 75 if (Z >= 90) {
67 if (U <= 16.25) { wa = G4Exp(0.5385*U-9.95 76 if (U <= 16.25) { wa = G4Exp(0.5385*U-9.9564); }
68 else { wa = G4Exp(0.09197*U-2.7 77 else { wa = G4Exp(0.09197*U-2.7003); }
69 } else if (Z == 89) { 78 } else if (Z == 89) {
70 wa = G4Exp(0.09197*U-1.0808); 79 wa = G4Exp(0.09197*U-1.0808);
71 } else if (Z >= 82) { 80 } else if (Z >= 82) {
72 G4double X = std::max(0.0, FissionBarrier/ 81 G4double X = std::max(0.0, FissionBarrier/CLHEP::MeV - 7.5);
73 wa = G4Exp(0.09197*(U-X) - 1.0808); 82 wa = G4Exp(0.09197*(U-X) - 1.0808);
74 } else { // Z < 82 83 } else { // Z < 82
75 w = 1001.0; 84 w = 1001.0;
76 } 85 }
77 86
78 if (Z >= 82) { << 87 if (w == 0.0) {
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 <<
86 G4double w1 = std::max(1.03*wa - FasymAsym 88 G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001);
87 G4double w2 = std::max(1.0 - FsymA1A2*wa, 89 G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001);
88 90
89 w = w1/w2; 91 w = w1/w2;
90 92
91 if (A < 227) { w *= G4Exp(0.3*(227-A)); } << 93 if (82 <= Z && Z < 89 && A < 227) { w *= G4Exp(0.3*(227-A)); }
92 } 94 }
93 } 95 }
94 96
95 97
96 98