[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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[1337] | 26 | // $Id: G4VGammaDeexcitation.cc,v 1.18 2010/06/25 09:46:13 gunter Exp $ |
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[1340] | 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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[819] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // GEANT 4 class file |
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| 31 | // |
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| 32 | // CERN, Geneva, Switzerland |
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| 33 | // |
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| 34 | // File name: G4VGammaDeexcitation |
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| 35 | // |
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| 36 | // Author: Maria Grazia Pia (pia@genova.infn.it) |
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| 37 | // |
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| 38 | // Creation date: 23 October 1998 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 21 Nov 2001, Fan Lei (flei@space.qinetiq.com) |
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| 43 | // Modified GenerateGamma() and UpdateUncleus() for implementation |
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| 44 | // of Internal Conversion processs |
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| 45 | // |
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| 46 | // 15 April 1999, Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it) |
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| 47 | // Added creation time evaluation for products of evaporation |
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| 48 | // |
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[1315] | 49 | // 19 April 2010, J. M. Quesada calculations in CM system |
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| 50 | // pending final boost to lab system (not critical) |
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[819] | 51 | // |
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[1315] | 52 | // 23 April 2010, V.Ivanchenko rewite kinematic part using PDG formula |
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| 53 | // for 2-body decay |
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| 54 | // |
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[819] | 55 | // ------------------------------------------------------------------- |
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| 56 | |
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| 57 | #include "G4VGammaDeexcitation.hh" |
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| 58 | |
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| 59 | #include "globals.hh" |
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| 60 | #include "Randomize.hh" |
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| 61 | #include "G4Gamma.hh" |
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| 62 | #include "G4Electron.hh" |
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| 63 | #include "G4LorentzVector.hh" |
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| 64 | #include "G4VGammaTransition.hh" |
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| 65 | #include "G4Fragment.hh" |
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| 66 | #include "G4FragmentVector.hh" |
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| 67 | |
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| 68 | #include "G4ParticleTable.hh" |
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| 69 | #include "G4IonTable.hh" |
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| 70 | |
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| 71 | #include "G4DiscreteGammaTransition.hh" |
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| 72 | |
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[1315] | 73 | |
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[819] | 74 | G4VGammaDeexcitation::G4VGammaDeexcitation(): _transition(0), _verbose(0), |
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| 75 | _electronO (0), _vSN(-1) |
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| 76 | { } |
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| 77 | |
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| 78 | G4VGammaDeexcitation::~G4VGammaDeexcitation() |
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| 79 | { |
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[1315] | 80 | if (_transition != 0) { delete _transition; } |
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[819] | 81 | } |
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| 82 | |
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| 83 | G4FragmentVector* G4VGammaDeexcitation::DoTransition() |
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| 84 | { |
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[1315] | 85 | Initialize(); |
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| 86 | G4FragmentVector* products = new G4FragmentVector(); |
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| 87 | |
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[819] | 88 | if (CanDoTransition()) |
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| 89 | { |
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[1315] | 90 | G4Fragment* gamma = GenerateGamma(); |
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| 91 | if (gamma != 0) { products->push_back(gamma); } |
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[819] | 92 | } |
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[1315] | 93 | |
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| 94 | if (_verbose > 1) { |
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[819] | 95 | G4cout << "G4VGammaDeexcitation::DoTransition - Transition deleted " << G4endl; |
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[1315] | 96 | } |
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| 97 | |
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[819] | 98 | return products; |
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| 99 | } |
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| 100 | |
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| 101 | G4FragmentVector* G4VGammaDeexcitation::DoChain() |
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| 102 | { |
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[1315] | 103 | if (_verbose > 1) { G4cout << "G4VGammaDeexcitation::DoChain" << G4endl; } |
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| 104 | const G4double tolerance = CLHEP::keV; |
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| 105 | |
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[819] | 106 | Initialize(); |
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[1315] | 107 | G4FragmentVector* products = new G4FragmentVector(); |
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| 108 | |
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[819] | 109 | while (CanDoTransition()) |
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[1315] | 110 | { |
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| 111 | _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy()); |
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[819] | 112 | G4Fragment* gamma = GenerateGamma(); |
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| 113 | if (gamma != 0) |
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| 114 | { |
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| 115 | products->push_back(gamma); |
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[1315] | 116 | //G4cout << "Eex(keV)= " << _nucleus->GetExcitationEnergy()/keV << G4endl; |
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| 117 | if(_nucleus->GetExcitationEnergy() <= tolerance) { break; } |
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| 118 | Update(); |
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[819] | 119 | } |
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| 120 | } |
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| 121 | |
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[1315] | 122 | if (_verbose > 1) { |
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| 123 | G4cout << "G4VGammaDeexcitation::DoChain - Transition deleted, end of chain " << G4endl; |
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| 124 | } |
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| 125 | |
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[819] | 126 | return products; |
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| 127 | } |
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| 128 | |
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| 129 | G4Fragment* G4VGammaDeexcitation::GenerateGamma() |
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| 130 | { |
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[1315] | 131 | // 23/04/10 V.Ivanchenko rewrite complitely |
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[819] | 132 | G4double eGamma = 0.; |
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[1315] | 133 | |
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[819] | 134 | if (_transition != 0) { |
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| 135 | _transition->SelectGamma(); // it can be conversion electron too |
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| 136 | eGamma = _transition->GetGammaEnergy(); |
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[1315] | 137 | if(eGamma <= 0.0) { return 0; } |
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[819] | 138 | } |
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[1315] | 139 | G4double excitation = _nucleus->GetExcitationEnergy() - eGamma; |
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| 140 | if(excitation < 0.0) { excitation = 0.0; } |
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[819] | 141 | if (_verbose > 1 && _transition != 0 ) |
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| 142 | { |
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[1315] | 143 | G4cout << "G4VGammaDeexcitation::GenerateGamma - Edeexc(MeV)= " << eGamma |
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| 144 | << " ** left Eexc(MeV)= " << excitation |
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[819] | 145 | << G4endl; |
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| 146 | } |
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| 147 | |
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[1315] | 148 | // Do complete Lorentz computation |
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[819] | 149 | |
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[1315] | 150 | G4LorentzVector lv = _nucleus->GetMomentum(); |
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| 151 | G4double Mass = _nucleus->GetGroundStateMass() + excitation; |
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| 152 | |
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| 153 | // select secondary |
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| 154 | G4ParticleDefinition* gamma = G4Gamma::Gamma(); |
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| 155 | |
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[819] | 156 | G4DiscreteGammaTransition* dtransition = 0; |
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| 157 | dtransition = dynamic_cast <G4DiscreteGammaTransition*> (_transition); |
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[1315] | 158 | if ( dtransition && !( dtransition->IsAGamma()) ) { |
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| 159 | gamma = G4Electron::Electron(); |
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| 160 | _vSN = dtransition->GetOrbitNumber(); |
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| 161 | _electronO.RemoveElectron(_vSN); |
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| 162 | lv += G4LorentzVector(0.0,0.0,0.0,CLHEP::electron_mass_c2 - dtransition->GetBondEnergy()); |
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| 163 | } |
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[819] | 164 | |
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[1315] | 165 | // check consistency |
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| 166 | G4double eMass = gamma->GetPDGMass(); |
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[819] | 167 | |
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[1315] | 168 | G4double Ecm = lv.mag(); |
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| 169 | G4ThreeVector bst = lv.boostVector(); |
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[819] | 170 | |
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[1315] | 171 | G4double GammaEnergy = 0.5*((Ecm - Mass)*(Ecm + Mass) + eMass*eMass)/Ecm; |
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| 172 | if(GammaEnergy <= eMass) { return 0; } |
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[819] | 173 | |
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[1315] | 174 | G4double cosTheta = 1. - 2. * G4UniformRand(); |
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| 175 | G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta); |
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| 176 | G4double phi = twopi * G4UniformRand(); |
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[1337] | 177 | G4double mom = std::sqrt((GammaEnergy - eMass)*(GammaEnergy + eMass)); |
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[1315] | 178 | G4LorentzVector Gamma4P(mom * sinTheta * std::cos(phi), |
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| 179 | mom * sinTheta * std::sin(phi), |
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| 180 | mom * cosTheta, |
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| 181 | GammaEnergy); |
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| 182 | Gamma4P.boost(bst); |
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| 183 | G4Fragment * thePhoton = new G4Fragment(Gamma4P,gamma); |
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[819] | 184 | |
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[1315] | 185 | G4double gammaTime = _nucleus->GetCreationTime() + _transition->GetGammaCreationTime(); |
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| 186 | thePhoton->SetCreationTime(gammaTime); |
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[819] | 187 | |
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[1315] | 188 | lv -= Gamma4P; |
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| 189 | _nucleus->SetMomentum(lv); |
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| 190 | _nucleus->SetCreationTime(gammaTime); |
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[819] | 191 | |
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[1315] | 192 | //G4cout << "G4VGammaDeexcitation::GenerateGamma left nucleus: " << _nucleus << G4endl; |
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| 193 | return thePhoton; |
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[819] | 194 | } |
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| 195 | |
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| 196 | void G4VGammaDeexcitation::Update() |
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| 197 | { |
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| 198 | if (_transition != 0) |
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| 199 | { |
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| 200 | delete _transition; |
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| 201 | _transition = 0; |
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[1315] | 202 | if (_verbose > 1) { |
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[819] | 203 | G4cout << "G4VGammaDeexcitation::Update - Transition deleted " << G4endl; |
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[1315] | 204 | } |
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[819] | 205 | } |
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[1315] | 206 | |
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[819] | 207 | _transition = CreateTransition(); |
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| 208 | if (_transition != 0) |
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| 209 | { |
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[1315] | 210 | _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy()); |
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| 211 | // if ( _vSN != -1) (dynamic_cast <G4DiscreteGammaTransition*> (_transition))->SetICM(false); |
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[819] | 212 | // the above line is commented out for bug fix #952. It was intruduced for reason that |
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| 213 | // the k-shell electron is most likely one to be kicked out and there is no time for |
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| 214 | // the atom to deexcite before the next IC. But this limitation is causing other problems as |
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| 215 | // reported in #952 |
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| 216 | } |
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[1315] | 217 | |
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[819] | 218 | return; |
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| 219 | } |
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