[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[962] | 27 | // $Id: G4StatMFMacroMultiplicity.cc,v 1.7 2008/11/19 14:33:31 vnivanch Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 29 | // |
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| 30 | // Hadronic Process: Nuclear De-excitations |
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| 31 | // by V. Lara |
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[962] | 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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[819] | 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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[962] | 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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[819] | 99 | // bracketing the solution |
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| 100 | G4int iterations = 0; |
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[962] | 101 | while (fChemPa*fChemPb > 0.0 && iterations < 100) |
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[819] | 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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[962] | 107 | iterations++; |
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[819] | 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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[962] | 113 | iterations++; |
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[819] | 114 | } |
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| 115 | } |
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[962] | 116 | |
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| 117 | if (fChemPa*fChemPb > 0.0) // the bracketing failed, complain |
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[819] | 118 | { |
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[962] | 119 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" ChemPa="<<ChemPa<<" ChemPb="<<ChemPb<< G4endl; |
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| 120 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" fChemPa="<<fChemPa<<" fChemPb="<<fChemPb<< G4endl; |
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[819] | 121 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMacroMultiplicity::CalcChemicalPotentialMu: I couldn't bracket the root."); |
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| 122 | } |
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[962] | 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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[819] | 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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[962] | 130 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" ChemPa="<<ChemPa<<" ChemPb="<<ChemPb<< G4endl; |
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| 131 | G4cerr <<"G4StatMFMacroMultiplicity:"<<" fChemPa="<<fChemPa<<" fChemPb="<<fChemPb<< G4endl; |
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[819] | 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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[962] | 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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[819] | 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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