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25 // 25 //
26 // 26 //
27 // 27 //
28 // Hadronic Process: Nuclear De-excitations 28 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara (Oct 1998) 29 // by V. Lara (Oct 1998)
30 // 30 //
31 //J. M. Quesada (May 2009): sigma_sym (SigmaS) 31 //J. M. Quesada (May 2009): sigma_sym (SigmaS) tuned for spallation data.
32 //J. M. Quesada (30.10.09): retuning for IAEA 32 //J. M. Quesada (30.10.09): retuning for IAEA spallation data
33 33
34 #include "G4FissionParameters.hh" 34 #include "G4FissionParameters.hh"
35 #include "G4SystemOfUnits.hh" 35 #include "G4SystemOfUnits.hh"
>> 36 #include "G4Exp.hh"
36 37
37 G4FissionParameters::G4FissionParameters() 38 G4FissionParameters::G4FissionParameters()
38 : A1(134),A2(141),A3((A1 + A2)*0.5),As(0.0), 39 : A1(134),A2(141),A3((A1 + A2)*0.5),As(0.0),Sigma1(0.0),Sigma2(0.0),
39 SigmaS(0.),w(0.0) 40 SigmaS(0.),w(0.0)
40 {} 41 {}
41 42
42 G4FissionParameters::~G4FissionParameters() 43 G4FissionParameters::~G4FissionParameters()
43 {} 44 {}
44 45
45 void G4FissionParameters::DefineParameters(G4i 46 void G4FissionParameters::DefineParameters(G4int A, G4int Z, G4double ExEnergy,
46 G4double FissionBarrier) 47 G4double FissionBarrier)
47 { 48 {
48 // to avoid usage of units 49 // to avoid usage of units
49 G4double U = std::min(200., ExEnergy/CLHEP:: << 50 G4double U = ExEnergy/CLHEP::MeV;
50 51
51 As = A*0.5; 52 As = A*0.5;
52 53
53 if (A <= 235) { Sigma2 = 5.6; } 54 if (A <= 235) { Sigma2 = 5.6; }
54 else { Sigma2 = 5.6 + 0.096*(A-235) 55 else { Sigma2 = 5.6 + 0.096*(A-235); }
55 56
56 Sigma1 = 0.5*Sigma2; 57 Sigma1 = 0.5*Sigma2;
57 58
58 //JMQ 310509 59 //JMQ 310509
59 // if (SigmaS > 20.0) SigmaS = 20.0; 60 // if (SigmaS > 20.0) SigmaS = 20.0;
60 // SigmaS*=1.3; 61 // SigmaS*=1.3;
61 //JMQ 301009: retuning (after CEM transition 62 //JMQ 301009: retuning (after CEM transition prob.have been chosen as default)
62 SigmaS = 0.8*G4Exp(0.00553*U + 2.1386); 63 SigmaS = 0.8*G4Exp(0.00553*U + 2.1386);
63 << 64
>> 65 G4double x1 = (A1-As)/Sigma1;
>> 66 G4double x2 = (A2-As)/Sigma2;
>> 67 G4double FasymAsym = 2*G4Exp(-0.5*x2*x2) + G4Exp(-0.5*x1*x1);
>> 68
>> 69 G4double x3 = (As-A3)/SigmaS;
>> 70 G4double FsymA1A2 = G4Exp(-0.5*x3*x3);
>> 71
64 G4double wa = 0.0; 72 G4double wa = 0.0;
65 w = 0.0; 73 w = 0.0;
66 if (Z >= 90) { 74 if (Z >= 90) {
67 if (U <= 16.25) { wa = G4Exp(0.5385*U-9.95 75 if (U <= 16.25) { wa = G4Exp(0.5385*U-9.9564); }
68 else { wa = G4Exp(0.09197*U-2.7 76 else { wa = G4Exp(0.09197*U-2.7003); }
69 } else if (Z == 89) { 77 } else if (Z == 89) {
70 wa = G4Exp(0.09197*U-1.0808); 78 wa = G4Exp(0.09197*U-1.0808);
71 } else if (Z >= 82) { 79 } else if (Z >= 82) {
72 G4double X = std::max(0.0, FissionBarrier/ 80 G4double X = std::max(0.0, FissionBarrier/CLHEP::MeV - 7.5);
73 wa = G4Exp(0.09197*(U-X) - 1.0808); 81 wa = G4Exp(0.09197*(U-X) - 1.0808);
74 } else { // Z < 82 82 } else { // Z < 82
75 w = 1001.0; 83 w = 1001.0;
76 } 84 }
77 85
78 if (Z >= 82) { << 86 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 87 G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001);
87 G4double w2 = std::max(1.0 - FsymA1A2*wa, 88 G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001);
88 89
89 w = w1/w2; 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 *= G4Exp(0.3*(227-A)); }
92 } 93 }
93 } 94 }
94 95
95 96
96 97