[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 | // $Id: G4eplusAnnihilation.cc,v 1.27 2007/10/02 10:17:12 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: G4eplusAnnihilation |
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| 35 | // |
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| 36 | // Author: Vladimir Ivanchenko on base of Michel Maire code |
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| 37 | // |
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| 38 | // Creation date: 02.08.2004 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivanchenko) |
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| 42 | // 08-04-05 Major optimisation of internal interfaces (V.Ivanchenko) |
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| 43 | // 03-05-05 suppress Integral option (mma) |
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| 44 | // 04-05-05 Make class to be default (V.Ivanchenko) |
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| 45 | // 25-01-06 remove cut dependance in AtRestDoIt (mma) |
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| 46 | // 09-08-06 add SetModel(G4VEmModel*) (mma) |
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| 47 | // 12-09-06, move SetModel(G4VEmModel*) in G4VEmProcess (mma) |
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| 48 | // |
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| 49 | |
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| 50 | // |
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| 51 | // ------------------------------------------------------------------- |
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| 52 | // |
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| 53 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 55 | |
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| 56 | #include "G4eplusAnnihilation.hh" |
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| 57 | #include "G4MaterialCutsCouple.hh" |
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| 58 | #include "G4Gamma.hh" |
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| 59 | #include "G4PhysicsVector.hh" |
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| 60 | #include "G4PhysicsLogVector.hh" |
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| 61 | #include "G4eeToTwoGammaModel.hh" |
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| 62 | |
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| 63 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 64 | |
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| 65 | using namespace std; |
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| 66 | |
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| 67 | G4eplusAnnihilation::G4eplusAnnihilation(const G4String& name) |
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| 68 | : G4VEmProcess(name), isInitialised(false) |
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| 69 | { |
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| 70 | enableAtRestDoIt = true; |
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| 71 | } |
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| 72 | |
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| 73 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 74 | |
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| 75 | G4eplusAnnihilation::~G4eplusAnnihilation() |
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| 76 | {} |
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| 77 | |
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| 78 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 79 | |
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| 80 | void G4eplusAnnihilation::InitialiseProcess(const G4ParticleDefinition*) |
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| 81 | { |
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| 82 | if(!isInitialised) { |
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| 83 | isInitialised = true; |
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| 84 | SetBuildTableFlag(true); |
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| 85 | SetStartFromNullFlag(false); |
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| 86 | SetSecondaryParticle(G4Gamma::Gamma()); |
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| 87 | G4double emin = 0.1*keV; |
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| 88 | G4double emax = 100.*TeV; |
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| 89 | SetLambdaBinning(120); |
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| 90 | SetMinKinEnergy(emin); |
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| 91 | SetMaxKinEnergy(emax); |
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| 92 | if(!Model()) SetModel(new G4eeToTwoGammaModel); |
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| 93 | Model()->SetLowEnergyLimit(emin); |
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| 94 | Model()->SetHighEnergyLimit(emax); |
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| 95 | AddEmModel(1, Model()); |
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| 96 | } |
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| 97 | } |
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| 98 | |
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| 99 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 100 | |
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| 101 | void G4eplusAnnihilation::PrintInfo() |
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| 102 | { |
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| 103 | G4cout |
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| 104 | << " Sampling according " << Model()->GetName() << " model" |
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| 105 | << G4endl; |
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| 106 | } |
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| 107 | |
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| 108 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 109 | |
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| 110 | G4VParticleChange* G4eplusAnnihilation::AtRestDoIt(const G4Track& aTrack, |
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| 111 | const G4Step& ) |
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| 112 | // |
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| 113 | // Performs the e+ e- annihilation when both particles are assumed at rest. |
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| 114 | // It generates two back to back photons with energy = electron_mass. |
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| 115 | // The angular distribution is isotropic. |
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| 116 | // GEANT4 internal units |
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| 117 | // |
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| 118 | // Note : Effects due to binding of atomic electrons are negliged. |
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| 119 | { |
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| 120 | fParticleChange.InitializeForPostStep(aTrack); |
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| 121 | |
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| 122 | fParticleChange.SetNumberOfSecondaries(2); |
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| 123 | |
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| 124 | G4double cosTeta = 2.*G4UniformRand()-1. , sinTeta = sqrt(1.-cosTeta*cosTeta); |
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| 125 | G4double phi = twopi * G4UniformRand(); |
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| 126 | G4ThreeVector direction (sinTeta*cos(phi), sinTeta*sin(phi), cosTeta); |
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| 127 | fParticleChange.AddSecondary( new G4DynamicParticle (G4Gamma::Gamma(), |
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| 128 | direction, electron_mass_c2) ); |
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| 129 | fParticleChange.AddSecondary( new G4DynamicParticle (G4Gamma::Gamma(), |
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| 130 | -direction, electron_mass_c2) ); |
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| 131 | // Kill the incident positron |
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| 132 | // |
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| 133 | fParticleChange.ProposeTrackStatus(fStopAndKill); |
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| 134 | return &fParticleChange; |
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| 135 | } |
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| 136 | |
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| 137 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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