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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4StatMFMacroMultiplicity.cc,v 1.7 2008/11/19 14:33:31 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03 $ |
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29 | // |
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30 | // Hadronic Process: Nuclear De-excitations |
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31 | // by V. Lara |
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32 | // |
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33 | // Modified: |
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34 | // 25.07.08 I.Pshenichnov (in collaboration with Alexander Botvina and Igor |
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35 | // Mishustin (FIAS, Frankfurt, INR, Moscow and Kurchatov Institute, |
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36 | // Moscow, pshenich@fias.uni-frankfurt.de) additional checks in |
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37 | // solver of equation for the chemical potential |
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38 | |
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39 | #include "G4StatMFMacroMultiplicity.hh" |
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40 | |
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41 | // operators definitions |
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42 | G4StatMFMacroMultiplicity & |
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43 | G4StatMFMacroMultiplicity::operator=(const G4StatMFMacroMultiplicity & ) |
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44 | { |
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45 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiplicity::operator= meant to not be accessable"); |
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46 | return *this; |
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47 | } |
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48 | |
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49 | G4bool G4StatMFMacroMultiplicity::operator==(const G4StatMFMacroMultiplicity & ) const |
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50 | { |
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51 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiplicity::operator== meant to not be accessable"); |
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52 | return false; |
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53 | } |
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54 | |
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55 | |
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56 | G4bool G4StatMFMacroMultiplicity::operator!=(const G4StatMFMacroMultiplicity & ) const |
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57 | { |
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58 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiplicity::operator!= meant to not be accessable"); |
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59 | return true; |
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60 | } |
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61 | |
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62 | |
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63 | |
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64 | |
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65 | G4double G4StatMFMacroMultiplicity::CalcChemicalPotentialMu(void) |
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66 | // Calculate Chemical potential \mu |
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67 | // For that is necesary to calculate mean multiplicities |
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68 | { |
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69 | G4double CP = ((3./5.)*elm_coupling/G4StatMFParameters::Getr0())* |
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70 | (1.0-1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1.0/3.0)); |
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71 | |
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72 | // starting value for chemical potential \mu |
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73 | // it is the derivative of F(T,V)-\nu*Z w.r.t. Af in Af=5 |
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74 | G4double ZA5 = _theClusters->operator[](4)->GetZARatio(); |
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75 | G4double ILD5 = _theClusters->operator[](4)->GetInvLevelDensity(); |
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76 | _ChemPotentialMu = -G4StatMFParameters::GetE0()- |
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77 | _MeanTemperature*_MeanTemperature/ILD5 - |
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78 | _ChemPotentialNu*ZA5 + |
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79 | G4StatMFParameters::GetGamma0()*(1.0-2.0*ZA5)*(1.0-2.0*ZA5) + |
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80 | (2.0/3.0)*G4StatMFParameters::Beta(_MeanTemperature)/std::pow(5.,1./3.) + |
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81 | (5.0/3.0)*CP*ZA5*ZA5*std::pow(5.,2./3.) - |
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82 | 1.5*_MeanTemperature/5.0; |
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83 | |
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84 | |
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85 | |
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86 | G4double ChemPa = _ChemPotentialMu; |
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87 | if (ChemPa/_MeanTemperature > 10.0) ChemPa = 10.0*_MeanTemperature; |
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88 | G4double ChemPb = ChemPa - 0.5*std::abs(ChemPa); |
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89 | |
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90 | |
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91 | G4double fChemPa = this->operator()(ChemPa); |
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92 | G4double fChemPb = this->operator()(ChemPb); |
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93 | |
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94 | |
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95 | // Set the precision level for locating the root. |
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96 | // If the root is inside this interval, then it's done! |
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97 | G4double intervalWidth = 1.e-4; |
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98 | |
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99 | // bracketing the solution |
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100 | G4int iterations = 0; |
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101 | while (fChemPa*fChemPb > 0.0 && iterations < 100) |
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102 | { |
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103 | if (std::abs(fChemPa) <= std::abs(fChemPb)) |
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104 | { |
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105 | ChemPa += 0.6*(ChemPa-ChemPb); |
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106 | fChemPa = this->operator()(ChemPa); |
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107 | iterations++; |
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108 | } |
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109 | else |
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110 | { |
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111 | ChemPb += 0.6*(ChemPb-ChemPa); |
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112 | fChemPb = this->operator()(ChemPb); |
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113 | iterations++; |
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114 | } |
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115 | } |
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116 | |
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117 | if (fChemPa*fChemPb > 0.0) // the bracketing failed, complain |
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118 | { |
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119 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" ChemPa="<<ChemPa<<" ChemPb="<<ChemPb<< G4endl; |
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120 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" fChemPa="<<fChemPa<<" fChemPb="<<fChemPb<< G4endl; |
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121 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiplicity::CalcChemicalPotentialMu: I couldn't bracket the root."); |
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122 | } |
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123 | else if (fChemPa*fChemPb < 0.0 && std::abs(ChemPa-ChemPb) > intervalWidth) // the bracketing was OK, try to locate the root |
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124 | { |
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125 | G4Solver<G4StatMFMacroMultiplicity> * theSolver = new G4Solver<G4StatMFMacroMultiplicity>(100,intervalWidth); |
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126 | theSolver->SetIntervalLimits(ChemPa,ChemPb); |
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127 | // if (!theSolver->Crenshaw(*this)) |
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128 | if (!theSolver->Brent(*this)) |
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129 | { |
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130 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" ChemPa="<<ChemPa<<" ChemPb="<<ChemPb<< G4endl; |
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131 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" fChemPa="<<fChemPa<<" fChemPb="<<fChemPb<< G4endl; |
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132 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiplicity::CalcChemicalPotentialMu: I couldn't find the root."); |
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133 | } |
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134 | _ChemPotentialMu = theSolver->GetRoot(); |
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135 | delete theSolver; |
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136 | } |
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137 | else // the root is within the interval, which is shorter then the precision level - all done |
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138 | { |
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139 | _ChemPotentialMu = ChemPa; |
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140 | } |
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141 | |
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142 | return _ChemPotentialMu; |
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143 | } |
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144 | |
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145 | |
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146 | |
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147 | G4double G4StatMFMacroMultiplicity::CalcMeanA(const G4double mu) |
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148 | { |
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149 | G4double r03 = G4StatMFParameters::Getr0(); r03 *= r03*r03; |
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150 | G4double V0 = (4.0/3.0)*pi*theA*r03; |
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151 | |
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152 | G4double MeanA = 0.0; |
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153 | |
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154 | _MeanMultiplicity = 0.0; |
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155 | |
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156 | |
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157 | G4int n = 1; |
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158 | for (std::vector<G4VStatMFMacroCluster*>::iterator i = _theClusters->begin(); |
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159 | i != _theClusters->end(); ++i) |
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160 | { |
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161 | G4double multip = (*i)->CalcMeanMultiplicity(V0*_Kappa,mu,_ChemPotentialNu,_MeanTemperature); |
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162 | MeanA += multip*static_cast<G4double>(n++); |
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163 | _MeanMultiplicity += multip; |
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164 | } |
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165 | |
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166 | return MeanA; |
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167 | } |
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