| 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: G4eeToPGammaModel.cc,v 1.1 2008/07/10 18:07:27 vnivanch Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-02 $
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| 28 | //
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| 29 | // -------------------------------------------------------------------
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| 30 | //
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| 31 | // GEANT4 Class header file
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| 32 | //
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| 33 | //
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| 34 | // File name: G4eeToPGammaModel
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| 35 | //
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| 36 | // Author: Vladimir Ivanchenko
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| 37 | //
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| 38 | // Creation date: 25.10.2003
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| 39 | //
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| 40 | // Modifications:
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| 41 | //
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| 42 | //
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| 43 | // -------------------------------------------------------------------
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| 44 | //
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| 45 |
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| 46 |
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| 47 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 48 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 49 |
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| 50 | #include "G4eeToPGammaModel.hh"
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| 51 | #include "Randomize.hh"
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| 52 | #include "G4PionZero.hh"
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| 53 | #include "G4Eta.hh"
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| 54 | #include "G4Gamma.hh"
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| 55 | #include "G4DynamicParticle.hh"
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| 56 | #include "G4PhysicsVector.hh"
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| 57 | #include "G4PhysicsLinearVector.hh"
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| 58 | #include "G4eeCrossSections.hh"
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| 59 |
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| 60 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 61 |
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| 62 | using namespace std;
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| 63 |
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| 64 | G4eeToPGammaModel::G4eeToPGammaModel(G4eeCrossSections* cr, const G4String& npart):
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| 65 | cross(cr)
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| 66 | {
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| 67 | pi0 = G4PionZero::PionZero();
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| 68 | if(npart == "pi0") {
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| 69 | massR = 782.62*MeV;
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| 70 | particle = pi0;
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| 71 | } else {
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| 72 | massR = 1019.46*MeV;
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| 73 | particle = G4Eta::Eta();
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| 74 | }
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| 75 | massP = particle->GetPDGMass();
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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 | G4eeToPGammaModel::~G4eeToPGammaModel()
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| 81 | {}
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| 82 |
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| 83 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 84 |
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| 85 | G4PhysicsVector* G4eeToPGammaModel::PhysicsVector(G4double emin,
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| 86 | G4double emax) const
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| 87 | {
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| 88 | G4double tmin = std::max(emin, ThresholdEnergy());
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| 89 | G4double tmax = std::max(tmin, emax);
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| 90 | G4int nbins = (G4int)((tmax - tmin)/(5.*MeV));
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| 91 | G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
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| 92 | v->SetSpline(true);
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| 93 | return v;
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| 94 | }
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| 95 |
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| 96 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 97 |
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| 98 | void G4eeToPGammaModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
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| 99 | G4double e, const G4ThreeVector& direction)
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| 100 | {
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| 101 | G4double egam = 0.5*e*(1.0 - massP*massP/(massR*massR));
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| 102 | G4double tkin = e - egam - massP;
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| 103 | if(tkin < 0.0) tkin = 0.0;
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| 104 | G4double cost;
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| 105 | do {
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| 106 | cost = 2.0*G4UniformRand() - 1.0;
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| 107 | } while( 2.0*G4UniformRand() > 1.0 + cost*cost );
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| 108 |
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| 109 | G4double sint = sqrt(1.0 - cost*cost);
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| 110 | G4double phi = twopi * G4UniformRand();
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| 111 |
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| 112 | G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
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| 113 | dir.rotateUz(direction);
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| 114 |
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| 115 | // create G4DynamicParticle objects
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| 116 | G4DynamicParticle* p1 =
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| 117 | new G4DynamicParticle(particle,dir,tkin);
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| 118 | G4DynamicParticle* p2 =
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| 119 | new G4DynamicParticle(G4Gamma::Gamma(),-dir,egam);
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| 120 | newp->push_back(p1);
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| 121 | newp->push_back(p2);
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| 122 | }
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| 123 |
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| 124 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 125 |
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