[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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| 27 | // |
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| 28 | // ------------------------------------------------------------ |
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| 29 | // GEANT 4 class implementation file |
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| 30 | // |
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| 31 | // ---------------- G4Fancy3DNucleus ---------------- |
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| 32 | // by Gunter Folger, May 1998. |
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| 33 | // class for a 3D nucleus, arranging nucleons in space and momentum. |
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| 34 | // ------------------------------------------------------------ |
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| 35 | |
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| 36 | #include "G4Fancy3DNucleus.hh" |
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| 37 | #include "G4NuclearFermiDensity.hh" |
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| 38 | #include "G4NuclearShellModelDensity.hh" |
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| 39 | #include "G4NucleiPropertiesTable.hh" |
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| 40 | #include "Randomize.hh" |
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| 41 | #include "G4ios.hh" |
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| 42 | #include <algorithm> |
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| 43 | #include "G4HadronicException.hh" |
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| 44 | |
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| 45 | G4Fancy3DNucleus::G4Fancy3DNucleus() |
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| 46 | : nucleondistance(0.8*fermi) |
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| 47 | { |
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| 48 | theDensity=0; |
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| 49 | theNucleons=0; |
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| 50 | currentNucleon=-1; |
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| 51 | myA=0; |
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| 52 | myZ=0; |
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| 53 | //G4cout <<"G4Fancy3DNucleus::G4Fancy3DNucleus()"<<G4endl; |
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| 54 | } |
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| 55 | |
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| 56 | G4Fancy3DNucleus::~G4Fancy3DNucleus() |
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| 57 | { |
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| 58 | if(theNucleons) delete [] theNucleons; |
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| 59 | if(theDensity) delete theDensity; |
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| 60 | } |
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| 61 | |
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| 62 | |
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| 63 | void G4Fancy3DNucleus::Init(G4double theA, G4double theZ) |
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| 64 | { |
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| 65 | // G4cout << "G4Fancy3DNucleus::Init(theA, theZ) called"<<G4endl; |
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| 66 | currentNucleon=-1; |
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| 67 | if(theNucleons) delete [] theNucleons; |
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| 68 | |
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| 69 | // this was delected already: |
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| 70 | // std::for_each(theRWNucleons.begin(), theRWNucleons.end(), DeleteNucleon()); |
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| 71 | theRWNucleons.clear(); |
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| 72 | |
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| 73 | myZ = G4int(theZ); |
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| 74 | myA= ( G4UniformRand()>theA-G4int(theA) ) ? G4int(theA) : G4int(theA)+1; |
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| 75 | |
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| 76 | theNucleons = new G4Nucleon[myA]; |
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| 77 | |
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| 78 | // G4cout << "myA, myZ" << myA << ", " << myZ << G4endl; |
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| 79 | |
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| 80 | if(theDensity) delete theDensity; |
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| 81 | if ( myA < 17 ) { |
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| 82 | theDensity = new G4NuclearShellModelDensity(myA, myZ); |
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| 83 | } else { |
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| 84 | theDensity = new G4NuclearFermiDensity(myA, myZ); |
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| 85 | } |
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| 86 | |
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| 87 | theFermi.Init(myA, myZ); |
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| 88 | |
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| 89 | ChooseNucleons(); |
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| 90 | |
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| 91 | ChoosePositions(); |
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| 92 | |
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| 93 | // CenterNucleons(); // This would introduce a bias |
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| 94 | |
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| 95 | ChooseFermiMomenta(); |
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| 96 | |
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| 97 | G4double Ebinding= BindingEnergy()/myA; |
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| 98 | |
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| 99 | for (G4int aNucleon=0; aNucleon < myA; aNucleon++) |
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| 100 | { |
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| 101 | theNucleons[aNucleon].SetBindingEnergy(Ebinding); |
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| 102 | } |
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| 103 | |
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| 104 | |
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| 105 | return; |
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| 106 | } |
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| 107 | |
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| 108 | G4bool G4Fancy3DNucleus::StartLoop() |
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| 109 | { |
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| 110 | currentNucleon=0; |
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| 111 | return theNucleons; |
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| 112 | } |
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| 113 | |
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| 114 | G4Nucleon * G4Fancy3DNucleus::GetNextNucleon() |
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| 115 | { |
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| 116 | return ( currentNucleon>=0 && currentNucleon<myA ) ? |
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| 117 | theNucleons+currentNucleon++ : 0; |
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| 118 | } |
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| 119 | |
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| 120 | |
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| 121 | const std::vector<G4Nucleon *> & G4Fancy3DNucleus::GetNucleons() |
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| 122 | { |
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| 123 | if ( theRWNucleons.size()==0 ) |
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| 124 | { |
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| 125 | for (G4int i=0; i< myA; i++) |
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| 126 | { |
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| 127 | theRWNucleons.push_back(theNucleons+i); |
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| 128 | } |
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| 129 | } |
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| 130 | return theRWNucleons; |
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| 131 | } |
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| 132 | |
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| 133 | G4double G4Fancy3DNucleus::BindingEnergy() |
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| 134 | { |
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| 135 | return G4NucleiPropertiesTable::GetBindingEnergy(myZ,myA); |
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| 136 | } |
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| 137 | |
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| 138 | G4double G4Fancy3DNucleus::GetNuclearRadius() |
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| 139 | { |
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| 140 | return GetNuclearRadius(0.5); |
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| 141 | } |
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| 142 | |
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| 143 | G4double G4Fancy3DNucleus::GetNuclearRadius(const G4double maxRelativeDensity) |
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| 144 | { |
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| 145 | return theDensity->GetRadius(maxRelativeDensity); |
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| 146 | } |
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| 147 | |
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| 148 | G4double G4Fancy3DNucleus::GetOuterRadius() |
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| 149 | { |
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| 150 | G4double maxradius2=0; |
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| 151 | |
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| 152 | for (int i=0; i<myA; i++) |
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| 153 | { |
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| 154 | if ( theNucleons[i].GetPosition().mag2() > maxradius2 ) |
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| 155 | { |
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| 156 | maxradius2=theNucleons[i].GetPosition().mag2(); |
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| 157 | } |
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| 158 | } |
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| 159 | return std::sqrt(maxradius2)+nucleondistance; |
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| 160 | } |
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| 161 | |
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| 162 | G4double G4Fancy3DNucleus::GetMass() |
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| 163 | { |
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| 164 | return myZ*G4Proton::Proton()->GetPDGMass() + |
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| 165 | (myA-myZ)*G4Neutron::Neutron()->GetPDGMass() - |
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| 166 | BindingEnergy(); |
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| 167 | } |
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| 168 | |
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| 169 | |
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| 170 | |
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| 171 | void G4Fancy3DNucleus::DoLorentzBoost(const G4LorentzVector & theBoost) |
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| 172 | { |
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| 173 | for (G4int i=0; i<myA; i++){ |
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| 174 | theNucleons[i].Boost(theBoost); |
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| 175 | } |
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| 176 | } |
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| 177 | |
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| 178 | void G4Fancy3DNucleus::DoLorentzBoost(const G4ThreeVector & theBeta) |
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| 179 | { |
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| 180 | for (G4int i=0; i<myA; i++){ |
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| 181 | theNucleons[i].Boost(theBeta); |
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| 182 | } |
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| 183 | } |
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| 184 | |
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| 185 | void G4Fancy3DNucleus::DoLorentzContraction(const G4ThreeVector & theBeta) |
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| 186 | { |
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| 187 | G4double factor=(1-std::sqrt(1-theBeta.mag2()))/theBeta.mag2(); // (gamma-1)/gamma/beta**2 |
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| 188 | for (G4int i=0; i< myA; i++) |
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| 189 | { |
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| 190 | G4ThreeVector rprime=theNucleons[i].GetPosition() - |
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| 191 | factor * (theBeta*theNucleons[i].GetPosition()) * |
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| 192 | // theNucleons[i].GetPosition(); |
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| 193 | theBeta; |
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| 194 | theNucleons[i].SetPosition(rprime); |
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| 195 | } |
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| 196 | } |
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| 197 | |
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| 198 | void G4Fancy3DNucleus::DoLorentzContraction(const G4LorentzVector & theBoost) |
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| 199 | { |
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| 200 | G4ThreeVector beta= 1/theBoost.e() * theBoost.vect(); |
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| 201 | // DoLorentzBoost(beta); |
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| 202 | DoLorentzContraction(beta); |
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| 203 | } |
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| 204 | |
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| 205 | |
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| 206 | |
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| 207 | void G4Fancy3DNucleus::CenterNucleons() |
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| 208 | { |
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| 209 | G4ThreeVector center; |
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| 210 | |
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| 211 | for (G4int i=0; i<myA; i++ ) |
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| 212 | { |
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| 213 | center+=theNucleons[i].GetPosition(); |
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| 214 | } |
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| 215 | center *= -1./myA; |
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| 216 | DoTranslation(center); |
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| 217 | } |
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| 218 | |
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| 219 | void G4Fancy3DNucleus::DoTranslation(const G4ThreeVector & theShift) |
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| 220 | { |
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| 221 | for (G4int i=0; i<myA; i++ ) |
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| 222 | { |
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| 223 | G4ThreeVector tempV = theNucleons[i].GetPosition() + theShift; |
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| 224 | theNucleons[i].SetPosition(tempV); |
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| 225 | } |
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| 226 | } |
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| 227 | |
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| 228 | const G4VNuclearDensity * G4Fancy3DNucleus::GetNuclearDensity() const |
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| 229 | { |
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| 230 | return theDensity; |
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| 231 | } |
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| 232 | |
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| 233 | //----------------------- private Implementation Methods------------- |
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| 234 | |
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| 235 | void G4Fancy3DNucleus::ChooseNucleons() |
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| 236 | { |
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| 237 | G4int protons=0,nucleons=0; |
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| 238 | |
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| 239 | while (nucleons < myA ) |
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| 240 | { |
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| 241 | if ( protons < myZ && G4UniformRand() < (G4double)(myZ-protons)/(G4double)(myA-nucleons) ) |
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| 242 | { |
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| 243 | protons++; |
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| 244 | theNucleons[nucleons++].SetParticleType(G4Proton::Proton()); |
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| 245 | } |
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| 246 | else if ( (nucleons-protons) < (myA-myZ) ) |
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| 247 | { |
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| 248 | theNucleons[nucleons++].SetParticleType(G4Neutron::Neutron()); |
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| 249 | } |
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| 250 | else G4cout << "G4Fancy3DNucleus::ChooseNucleons not efficient" << G4endl; |
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| 251 | } |
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| 252 | return; |
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| 253 | } |
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| 254 | |
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| 255 | void G4Fancy3DNucleus::ChoosePositions() |
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| 256 | { |
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| 257 | G4int i=0; |
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| 258 | G4ThreeVector aPos, delta; |
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| 259 | std::vector<G4ThreeVector> places; |
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| 260 | places.reserve(myA); |
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| 261 | G4bool freeplace; |
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| 262 | static G4double nd2 = sqr(nucleondistance); |
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| 263 | G4double maxR=GetNuclearRadius(0.01); // there are no nucleons at a |
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| 264 | // relative Density of 0.01 |
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| 265 | G4int jr=0; |
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| 266 | G4int jx,jy; |
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| 267 | G4double arand[600]; |
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| 268 | G4double *prand=arand; |
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| 269 | // G4int Attempt=0; |
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| 270 | while ( i < myA ) |
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| 271 | { |
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| 272 | do |
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| 273 | { |
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| 274 | // ++Attempt; |
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| 275 | if ( jr < 3 ) |
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| 276 | { |
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| 277 | jr=std::min(600,9*(myA - i)); |
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| 278 | CLHEP::RandFlat::shootArray(jr, prand ); |
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| 279 | } |
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| 280 | jx=--jr; |
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| 281 | jy=--jr; |
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| 282 | aPos=G4ThreeVector( (2*arand[jx]-1.), |
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| 283 | (2*arand[jy]-1.), |
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| 284 | (2*arand[--jr]-1.)); |
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| 285 | } while (aPos.mag2() > 1. ); |
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| 286 | aPos *=maxR; |
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| 287 | G4double density=theDensity->GetRelativeDensity(aPos); |
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| 288 | if (G4UniformRand() < density) |
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| 289 | { |
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| 290 | freeplace= true; |
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| 291 | std::vector<G4ThreeVector>::iterator iplace; |
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| 292 | for( iplace=places.begin(); iplace!=places.end() && freeplace;++iplace) |
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| 293 | { |
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| 294 | delta = *iplace - aPos; |
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| 295 | freeplace= delta.mag2() > nd2; |
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| 296 | } |
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| 297 | |
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| 298 | if ( freeplace ) |
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| 299 | { |
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| 300 | G4double pFermi=theFermi.GetFermiMomentum(theDensity->GetDensity(aPos)); |
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| 301 | // protons must at least have binding energy of CoulombBarrier, so |
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| 302 | // assuming the Fermi energy corresponds to a potential, we must place these such |
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| 303 | // that the Fermi Energy > CoulombBarrier |
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| 304 | if (theNucleons[i].GetDefinition() == G4Proton::Proton()) |
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| 305 | { |
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| 306 | G4double eFermi= std::sqrt( sqr(pFermi) + sqr(theNucleons[i].GetDefinition()->GetPDGMass()) ) |
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| 307 | - theNucleons[i].GetDefinition()->GetPDGMass(); |
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| 308 | if (eFermi <= CoulombBarrier() ) freeplace=false; |
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| 309 | } |
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| 310 | } |
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| 311 | if ( freeplace ) |
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| 312 | { |
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| 313 | theNucleons[i].SetPosition(aPos); |
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| 314 | places.push_back(aPos); |
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| 315 | ++i; |
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| 316 | } |
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| 317 | } |
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| 318 | } |
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| 319 | // G4cout << "Att " << myA << " " << Attempt << G4endl; |
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| 320 | |
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| 321 | } |
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| 322 | |
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| 323 | void G4Fancy3DNucleus::ChooseFermiMomenta() |
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| 324 | { |
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| 325 | G4int i; |
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| 326 | G4double density; |
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| 327 | G4ThreeVector * momentum=new G4ThreeVector[myA]; |
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| 328 | |
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| 329 | G4double * fermiM=new G4double[myA]; |
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| 330 | |
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| 331 | for (G4int ntry=0; ntry<1 ; ntry ++ ) |
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| 332 | { |
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| 333 | for (i=0; i < myA; i++ ) // momenta for all, including last, in case we swap nucleons |
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| 334 | { |
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| 335 | density = theDensity->GetDensity(theNucleons[i].GetPosition()); |
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| 336 | fermiM[i] = theFermi.GetFermiMomentum(density); |
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| 337 | G4ThreeVector mom=theFermi.GetMomentum(density); |
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| 338 | if (theNucleons[i].GetDefinition() == G4Proton::Proton()) |
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| 339 | { |
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| 340 | G4double eMax = std::sqrt(sqr(fermiM[i]) +sqr(theNucleons[i].GetDefinition()->GetPDGMass()) ) |
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| 341 | - CoulombBarrier(); |
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| 342 | if ( eMax > theNucleons[i].GetDefinition()->GetPDGMass() ) |
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| 343 | { |
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| 344 | G4double pmax2= sqr(eMax) - sqr(theNucleons[i].GetDefinition()->GetPDGMass()); |
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| 345 | fermiM[i] = std::sqrt(pmax2); |
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| 346 | while ( mom.mag2() > pmax2 ) |
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| 347 | { |
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| 348 | mom=theFermi.GetMomentum(density, fermiM[i]); |
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| 349 | } |
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| 350 | } else |
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| 351 | { |
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| 352 | G4cerr << "G4Fancy3DNucleus: difficulty finding proton momentum" << G4endl; |
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| 353 | mom=0; |
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| 354 | } |
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| 355 | |
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| 356 | } |
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| 357 | momentum[i]= mom; |
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| 358 | } |
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| 359 | |
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| 360 | if (ReduceSum(momentum,fermiM) ) |
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| 361 | break; |
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| 362 | // G4cout <<" G4FancyNucleus: iterating to find momenta: "<< ntry<< G4endl; |
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| 363 | } |
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| 364 | |
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| 365 | // G4ThreeVector sum; |
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| 366 | // for (G4int index=0; index<myA;sum+=momentum[index++]) |
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| 367 | // ; |
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| 368 | // G4cout << "final sum / mag() " << sum << " / " << sum.mag() << G4endl; |
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| 369 | |
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| 370 | |
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| 371 | G4double energy; |
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| 372 | for ( i=0; i< myA ; i++ ) |
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| 373 | { |
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| 374 | energy = theNucleons[i].GetParticleType()->GetPDGMass() |
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| 375 | - BindingEnergy()/myA; |
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| 376 | G4LorentzVector tempV(momentum[i],energy); |
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| 377 | theNucleons[i].SetMomentum(tempV); |
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| 378 | } |
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| 379 | |
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| 380 | delete [] momentum; |
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| 381 | delete [] fermiM; |
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| 382 | } |
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| 383 | |
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| 384 | class G4Fancy3DNucleusHelper // Helper class |
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| 385 | { |
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| 386 | public: |
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| 387 | G4Fancy3DNucleusHelper(const G4ThreeVector &vec,const G4double size,const G4int index) |
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| 388 | : Vector(vec), Size(size), anInt(index) {} |
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| 389 | int operator ==(const G4Fancy3DNucleusHelper &right) const |
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| 390 | { |
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| 391 | return this==&right; |
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| 392 | } |
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| 393 | int operator < (const G4Fancy3DNucleusHelper &right) const |
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| 394 | { |
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| 395 | return size()<right.size(); |
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| 396 | } |
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| 397 | const G4ThreeVector& vector() const |
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| 398 | { |
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| 399 | return Vector; |
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| 400 | } |
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| 401 | G4double size() const |
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| 402 | { |
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| 403 | return Size; |
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| 404 | } |
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| 405 | G4int index() const |
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| 406 | { |
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| 407 | return anInt; |
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| 408 | } |
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| 409 | G4Fancy3DNucleusHelper operator =(const G4Fancy3DNucleusHelper &right) |
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| 410 | { |
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| 411 | Vector = right.Vector; |
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| 412 | Size = right.Size; |
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| 413 | anInt = right.anInt; |
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| 414 | return *this; |
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| 415 | } |
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| 416 | |
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| 417 | private: |
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| 418 | G4Fancy3DNucleusHelper(): Vector(0), Size(0), anInt(0) {G4cout << "def ctor for MixMasch" << G4endl;} |
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| 419 | G4ThreeVector Vector; |
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| 420 | G4double Size; |
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| 421 | G4int anInt; |
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| 422 | }; |
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| 423 | |
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| 424 | G4bool G4Fancy3DNucleus::ReduceSum(G4ThreeVector * momentum, G4double *pFermiM) |
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| 425 | { |
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| 426 | G4ThreeVector sum; |
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| 427 | G4double PFermi=pFermiM[myA-1]; |
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| 428 | |
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| 429 | for (G4int i=0; i < myA-1 ; i++ ) |
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| 430 | { sum+=momentum[i]; } |
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| 431 | |
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| 432 | // check if have to do anything at all.. |
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| 433 | if ( sum.mag() <= PFermi ) |
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| 434 | { |
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| 435 | momentum[myA-1]=-sum; |
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| 436 | return true; |
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| 437 | } |
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| 438 | |
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| 439 | // find all possible changes in momentum, changing only the component parallel to sum |
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| 440 | G4ThreeVector testDir=sum.unit(); |
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| 441 | std::vector<G4Fancy3DNucleusHelper> testSums; // Sorted on delta.mag() |
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| 442 | |
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| 443 | for ( G4int aNucleon=0; aNucleon < myA-1; aNucleon++){ |
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| 444 | G4ThreeVector delta=2*((momentum[aNucleon]*testDir)* testDir); |
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| 445 | testSums.push_back(G4Fancy3DNucleusHelper(delta,delta.mag(),aNucleon)); |
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| 446 | } |
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| 447 | std::sort(testSums.begin(), testSums.end()); |
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| 448 | |
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| 449 | // reduce Momentum Sum until the next would be allowed. |
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| 450 | G4int index=testSums.size(); |
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| 451 | while ( (sum-testSums[--index].vector()).mag()>PFermi && index>0) |
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| 452 | { |
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| 453 | // Only take one which improve, ie. don't change sign and overshoot... |
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| 454 | if ( sum.mag() > (sum-testSums[index].vector()).mag() ) { |
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| 455 | momentum[testSums[index].index()]-=testSums[index].vector(); |
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| 456 | sum-=testSums[index].vector(); |
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| 457 | } |
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| 458 | } |
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| 459 | |
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| 460 | if ( (sum-testSums[index].vector()).mag() <= PFermi ) |
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| 461 | { |
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| 462 | G4int best=-1; |
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| 463 | G4double pBest=2*PFermi; // anything larger than PFermi |
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| 464 | for ( G4int aNucleon=0; aNucleon<=index; aNucleon++) |
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| 465 | { |
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| 466 | // find the momentum closest to choosen momentum for last Nucleon. |
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| 467 | G4double pTry=(testSums[aNucleon].vector()-sum).mag(); |
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| 468 | if ( pTry < PFermi |
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| 469 | && std::abs(momentum[myA-1].mag() - pTry ) < pBest ) |
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| 470 | { |
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| 471 | pBest=std::abs(momentum[myA-1].mag() - pTry ); |
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| 472 | best=aNucleon; |
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| 473 | } |
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| 474 | } |
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| 475 | if ( best < 0 ) |
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| 476 | { |
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| 477 | G4String text = "G4Fancy3DNucleus.cc: Logic error in ReduceSum()"; |
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| 478 | throw G4HadronicException(__FILE__, __LINE__, text); |
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| 479 | } |
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| 480 | momentum[testSums[best].index()]-=testSums[best].vector(); |
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| 481 | momentum[myA-1]=testSums[best].vector()-sum; |
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| 482 | |
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| 483 | testSums.clear(); |
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| 484 | return true; |
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| 485 | |
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| 486 | } |
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| 487 | testSums.clear(); |
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| 488 | |
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| 489 | // try to compensate momentum using another Nucleon.... |
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| 490 | |
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| 491 | G4int swapit=-1; |
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| 492 | while (swapit<myA-1) |
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| 493 | { |
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| 494 | if ( pFermiM[++swapit] > PFermi ) break; |
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| 495 | } |
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| 496 | if (swapit == myA-1 ) return false; |
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| 497 | |
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| 498 | // Now we have a nucleon with a bigger Fermi Momentum. |
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| 499 | // Exchange with last nucleon.. and iterate. |
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| 500 | // G4cout << " Nucleon to swap with : " << swapit << G4endl; |
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| 501 | // G4cout << " Fermi momentum test, and better.. " << PFermi << " / " |
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| 502 | // << theFermi.GetFermiMomentum(density) << G4endl; |
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| 503 | // cout << theNucleons[swapit]<< G4endl << theNucleons[myA-1] << G4endl; |
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| 504 | // cout << momentum[swapit] << G4endl << momentum[myA-1] << G4endl; |
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| 505 | G4Nucleon swap= theNucleons[swapit]; |
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| 506 | G4ThreeVector mom_swap=momentum[swapit]; |
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| 507 | G4double pf=pFermiM[swapit]; |
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| 508 | theNucleons[swapit]=theNucleons[myA-1]; |
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| 509 | momentum[swapit]=momentum[myA-1]; |
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| 510 | pFermiM[swapit]=pFermiM[myA-1]; |
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| 511 | theNucleons[myA-1]=swap; |
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| 512 | momentum[myA-1]=mom_swap; |
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| 513 | pFermiM[myA-1]=pf; |
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| 514 | // cout << "after swap" <<G4endl<< theNucleons[swapit] << G4endl << theNucleons[myA-1] << G4endl; |
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| 515 | // cout << momentum[swapit] << G4endl << momentum[myA-1] << G4endl; |
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| 516 | return ReduceSum(momentum,pFermiM); |
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| 517 | } |
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| 518 | |
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| 519 | G4double G4Fancy3DNucleus::CoulombBarrier() |
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| 520 | { |
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| 521 | G4double coulombBarrier = (1.44/1.14) * MeV * myZ / (1.0 + std::pow(G4double(myA),1./3.)); |
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| 522 | return coulombBarrier; |
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| 523 | } |
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