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G4FissionProbability.cc
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27 // $Id: G4FissionProbability.cc 105799 2017-08-21 07:35:55Z gcosmo $
28 //
29 // Hadronic Process: Nuclear De-excitations
30 // by V. Lara (Oct 1998)
31 //
32 //
33 // J.M.Quesada (14 february 2009) bug fixed in fission width: missing
34 // parenthesis in the denominator
35 
36 
37 #include "G4FissionProbability.hh"
38 #include "G4PhysicalConstants.hh"
39 #include "G4NuclearLevelData.hh"
40 #include "G4PairingCorrection.hh"
43 #include "G4Exp.hh"
44 
47  theEvapLDP(new G4EvaporationLevelDensityParameter),
48  theFissLDP(new G4FissionLevelDensityParameter),
49  ownEvapLDP(true),
50  ownFissLDP(true)
51 {
53 }
54 
56 {
57  if (ownEvapLDP) delete theEvapLDP;
58  if (ownFissLDP) delete theFissLDP;
59 }
60 
61 G4double
63  G4double MaximalKineticEnergy)
64  // Compute integrated probability of fission channel
65 {
66  if (MaximalKineticEnergy <= 0.0) { return 0.0; }
67  G4int A = fragment.GetA_asInt();
68  G4int Z = fragment.GetZ_asInt();
69  G4double U = fragment.GetExcitationEnergy();
70 
71  G4double Ucompound = U - fPairCorr->GetPairingCorrection(A,Z);
72 
73  G4double Ufission = U - fPairCorr->GetFissionPairingCorrection(A,Z);
74 
75  G4double SystemEntropy =
76  2.0*std::sqrt(theEvapLDP->LevelDensityParameter(A,Z,Ucompound)*Ucompound);
77 
78  G4double afission = theFissLDP->LevelDensityParameter(A,Z,Ufission);
79 
80  G4double Cf = 2.0*std::sqrt(afission*MaximalKineticEnergy);
81 
82  // G4double Q1 = 1.0 + (Cf - 1.0)*G4Exp(Cf);
83  // G4double Q2 = 4.0*pi*afission*G4Exp(SystemEntropy);
84 
85  // G4double probability = Q1/Q2;
86 
87  G4double Exp1 = 0.0;
88  if (SystemEntropy <= 160.0) { Exp1 = G4Exp(-SystemEntropy); }
89  // @@@@@@@@@@@@@@@@@ hpw changed max to min - cannot notify vicente now
90  G4double Exp2 = G4Exp( std::min(300.0,Cf-SystemEntropy) );
91 
92  // JMQ 14/02/09 BUG fixed in fission probability (missing parenthesis
93  // at denominator)
94  //AH fix from Vincente: G4double probability =
95  // (Exp1 + (1.0-Cf)*Exp2) / 4.0*pi*afission;
96  // G4double probability = (Exp1 + (Cf-1.0)*Exp2) / 4.0*pi*afission;
97  G4double probability = (Exp1 + (Cf-1.0)*Exp2) / (4.0*pi*afission);
98 
99  return probability;
100 }
101 
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:183
G4double GetFissionPairingCorrection(G4int A, G4int Z) const
G4VLevelDensityParameter * theEvapLDP
virtual G4double LevelDensityParameter(G4int A, G4int Z, G4double U) const =0
static G4NuclearLevelData * GetInstance()
G4VLevelDensityParameter * theFissLDP
G4int GetA_asInt() const
Definition: G4Fragment.hh:259
G4PairingCorrection * fPairCorr
Float_t Z
double G4double
Definition: G4Types.hh:76
double A(double temperature)
G4int GetZ_asInt() const
Definition: G4Fragment.hh:264
int G4int
Definition: G4Types.hh:78
G4double GetPairingCorrection(G4int A, G4int Z) const
static constexpr double pi
Definition: G4SIunits.hh:75
G4double EmissionProbability(const G4Fragment &fragment, G4double MaximalKineticEnergy) override
G4PairingCorrection * GetPairingCorrection()
G4double GetExcitationEnergy() const
Definition: G4Fragment.hh:276
T min(const T t1, const T t2)
brief Return the smallest of the two arguments