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>> 27 // $Id: G4FissionProbability.cc 84396 2014-10-15 07:18:24Z 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 // 32 //
32 // J.M.Quesada (14 february 2009) bug fixed in << 33 // J.M.Quesada (14 february 2009) bug fixed in fission width: missing parenthesis in the denominator
33 // parenthesis <<
34 34
35 35
36 #include "G4FissionProbability.hh" 36 #include "G4FissionProbability.hh"
37 #include "G4PhysicalConstants.hh" 37 #include "G4PhysicalConstants.hh"
38 #include "G4NuclearLevelData.hh" <<
39 #include "G4PairingCorrection.hh" 38 #include "G4PairingCorrection.hh"
40 #include "G4EvaporationLevelDensityParameter.h 39 #include "G4EvaporationLevelDensityParameter.hh"
41 #include "G4FissionLevelDensityParameter.hh" 40 #include "G4FissionLevelDensityParameter.hh"
42 #include "G4Exp.hh" <<
43 41
44 G4FissionProbability::G4FissionProbability() : 42 G4FissionProbability::G4FissionProbability() :
45 G4VEmissionProbability(0, 0), <<
46 theEvapLDP(new G4EvaporationLevelDensityPara 43 theEvapLDP(new G4EvaporationLevelDensityParameter),
47 theFissLDP(new G4FissionLevelDensityParamete 44 theFissLDP(new G4FissionLevelDensityParameter),
48 ownEvapLDP(true), 45 ownEvapLDP(true),
49 ownFissLDP(true) 46 ownFissLDP(true)
50 { << 47 {}
51 fPairCorr = G4NuclearLevelData::GetInstance( <<
52 } <<
53 48
54 G4FissionProbability::~G4FissionProbability() 49 G4FissionProbability::~G4FissionProbability()
55 { 50 {
56 if (ownEvapLDP) delete theEvapLDP; 51 if (ownEvapLDP) delete theEvapLDP;
57 if (ownFissLDP) delete theFissLDP; 52 if (ownFissLDP) delete theFissLDP;
58 } 53 }
59 54
>> 55
60 G4double 56 G4double
61 G4FissionProbability::EmissionProbability(cons 57 G4FissionProbability::EmissionProbability(const G4Fragment & fragment,
62 G4double MaximalKineticEnergy) 58 G4double MaximalKineticEnergy)
63 // Compute integrated probability of fission 59 // Compute integrated probability of fission channel
64 { 60 {
65 if (MaximalKineticEnergy <= 0.0) { return 0. << 61 if (MaximalKineticEnergy <= 0.0) return 0.0;
66 G4int A = fragment.GetA_asInt(); 62 G4int A = fragment.GetA_asInt();
67 G4int Z = fragment.GetZ_asInt(); 63 G4int Z = fragment.GetZ_asInt();
68 G4double U = fragment.GetExcitationEnergy(); 64 G4double U = fragment.GetExcitationEnergy();
69 65
70 G4double Ucompound = U - fPairCorr->GetPairi << 66 G4double Ucompound = U -
71 G4double Ufission = U - fPairCorr->GetFissio << 67 G4PairingCorrection::GetInstance()->GetPairingCorrection(A,Z);
72 if(Ucompound < 0.0 || Ufission < 0.0) { retu << 68
>> 69 G4double Ufission = U -
>> 70 G4PairingCorrection::GetInstance()->GetFissionPairingCorrection(A,Z);
73 71
74 G4double SystemEntropy = 72 G4double SystemEntropy =
75 2.0*std::sqrt(theEvapLDP->LevelDensityPara 73 2.0*std::sqrt(theEvapLDP->LevelDensityParameter(A,Z,Ucompound)*Ucompound);
76 74
77 G4double afission = theFissLDP->LevelDensity 75 G4double afission = theFissLDP->LevelDensityParameter(A,Z,Ufission);
78 76
79 G4double Cf = 2.0*std::sqrt(afission*Maximal 77 G4double Cf = 2.0*std::sqrt(afission*MaximalKineticEnergy);
80 G4double Exp1 = (SystemEntropy <= 160.0) ? G << 78
81 G4double Exp2 = (SystemEntropy-Cf <= 160.0) << 79 // G4double Q1 = 1.0 + (Cf - 1.0)*std::exp(Cf);
>> 80 // G4double Q2 = 4.0*pi*afission*std::exp(SystemEntropy);
>> 81
>> 82 // G4double probability = Q1/Q2;
>> 83
>> 84 G4double Exp1 = 0.0;
>> 85 if (SystemEntropy <= 160.0) { Exp1 = std::exp(-SystemEntropy); }
>> 86 // @@@@@@@@@@@@@@@@@ hpw changed max to min - cannot notify vicente now
>> 87 G4double Exp2 = std::exp( std::min(700.0,Cf-SystemEntropy) );
82 88
83 // JMQ 14/02/09 BUG fixed in fission probabi 89 // JMQ 14/02/09 BUG fixed in fission probability (missing parenthesis
84 // at denominator) 90 // at denominator)
>> 91 //AH fix from Vincente: G4double probability =
>> 92 // (Exp1 + (1.0-Cf)*Exp2) / 4.0*pi*afission;
>> 93 // G4double probability = (Exp1 + (Cf-1.0)*Exp2) / 4.0*pi*afission;
85 G4double probability = (Exp1 + (Cf-1.0)*Exp2 94 G4double probability = (Exp1 + (Cf-1.0)*Exp2) / (4.0*pi*afission);
86 95
87 return probability; 96 return probability;
88 } 97 }
89 98
90 99