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25 //
26 //
27 //
28 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara
30
31 #include "G4StatMFMacroChemicalPotential.hh"
32 #include "G4PhysicalConstants.hh"
33 #include "G4Pow.hh"
34
35 // operators definitions
36 G4StatMFMacroChemicalPotential &
37 G4StatMFMacroChemicalPotential::operator=(const G4StatMFMacroChemicalPotential & )
38 {
39 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroChemicalPotential::operator= meant to not be accessible");
40 return *this;
41 }
42
43 G4bool G4StatMFMacroChemicalPotential::operator==(const G4StatMFMacroChemicalPotential & ) const
44 {
45 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroChemicalPotential::operator== meant to not be accessible");
46 return false;
47 }
48
49
50 G4bool G4StatMFMacroChemicalPotential::operator!=(const G4StatMFMacroChemicalPotential & ) const
51 {
52 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroChemicalPotential::operator!= meant to not be accessible");
53 return true;
54 }
55
56 G4double G4StatMFMacroChemicalPotential::CalcChemicalPotentialNu(void)
57 // Calculate Chemical potential \nu
58 {
59 G4Pow* g4calc = G4Pow::GetInstance();
60 G4double CP = G4StatMFParameters::GetCoulomb();
61
62 // Initial value for _ChemPotentialNu
63 _ChemPotentialNu = (theZ/theA)*(8.0*G4StatMFParameters::GetGamma0()
64 +2.0*CP*g4calc->Z23(theA))
65 - 4.0*G4StatMFParameters::GetGamma0();
66
67 G4double ChemPa = _ChemPotentialNu;
68 G4double ChemPb = 0.5*_ChemPotentialNu;
69
70 G4double fChemPa = this->operator()(ChemPa);
71 G4double fChemPb = this->operator()(ChemPb);
72
73 if (fChemPa*fChemPb > 0.0) {
74 // bracketing the solution
75 if (fChemPa < 0.0) {
76 do {
77 ChemPb -= 1.5*std::abs(ChemPb-ChemPa);
78 fChemPb = this->operator()(ChemPb);
79 // Loop checking, 05-Aug-2015, Vladimir Ivanchenko
80 } while (fChemPb < 0.0);
81 } else {
82 do {
83 ChemPb += 1.5*std::abs(ChemPb-ChemPa);
84 fChemPb = this->operator()(ChemPb);
85 // Loop checking, 05-Aug-2015, Vladimir Ivanchenko
86 } while (fChemPb > 0.0);
87 }
88 }
89
90 G4Solver<G4StatMFMacroChemicalPotential> * theSolver =
91 new G4Solver<G4StatMFMacroChemicalPotential>(100,1.e-4);
92 theSolver->SetIntervalLimits(ChemPa,ChemPb);
93 // if (!theSolver->Crenshaw(*this))
94 if (!theSolver->Brent(*this)){
95 G4cout <<"G4StatMFMacroChemicalPotential:"<<" ChemPa="<<ChemPa
96 <<" ChemPb="<<ChemPb<< G4endl;
97 G4cout <<"G4StatMFMacroChemicalPotential:"<<" fChemPa="<<fChemPa
98 <<" fChemPb="<<fChemPb<< G4endl;
99 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroChemicalPotential::CalcChemicalPotentialNu: I couldn't find the root.");
100 }
101 _ChemPotentialNu = theSolver->GetRoot();
102 delete theSolver;
103 return _ChemPotentialNu;
104 }
105
106
107
108 G4double G4StatMFMacroChemicalPotential::CalcMeanZ(const G4double nu)
109 {
110 std::vector<G4VStatMFMacroCluster*>::iterator i;
111 for (i= _theClusters->begin()+1; i != _theClusters->end(); ++i)
112 {
113 (*i)->CalcZARatio(nu);
114 }
115 CalcChemicalPotentialMu(nu);
116 // This is important, the Z over A ratio for proton and neutron depends on the
117 // chemical potential Mu, while for the first guess for Chemical potential mu
118 // some values of Z over A ratio. This is the reason for that.
119 (*_theClusters->begin())->CalcZARatio(nu);
120
121 G4double MeanZ = 0.0;
122 G4int n = 1;
123 for (i = _theClusters->begin(); i != _theClusters->end(); ++i)
124 {
125 MeanZ += (n++) * (*i)->GetZARatio() * (*i)->GetMeanMultiplicity();
126 }
127 return MeanZ;
128 }
129
130 void G4StatMFMacroChemicalPotential::CalcChemicalPotentialMu(const G4double nu)
131 // Calculate Chemical potential \mu
132 // For that is necesary to calculate mean multiplicities
133 {
134 G4StatMFMacroMultiplicity * theMultip = new
135 G4StatMFMacroMultiplicity(theA,_Kappa,_MeanTemperature,nu,_theClusters);
136
137 _ChemPotentialMu = theMultip->CalcChemicalPotentialMu();
138 _MeanMultiplicity = theMultip->GetMeanMultiplicity();
139
140 delete theMultip;
141
142 return;
143 }
144