[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 | // $Id: G4QuasiElasticChannel.cc,v 1.1.2.2 2008/04/24 13:44:10 gcosmo Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 29 | // |
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| 30 | |
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| 31 | // Author : Gunter Folger March 2007 |
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| 32 | // Class Description |
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| 33 | // Final state production model for theoretical models of hadron inelastic |
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| 34 | // quasi elastic scattering in geant4; |
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| 35 | // Class Description - End |
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| 36 | // |
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| 37 | // Modified: |
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| 38 | |
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| 39 | #include "G4QuasiElasticChannel.hh" |
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| 40 | |
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| 41 | #include "G4Fancy3DNucleus.hh" |
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| 42 | |
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| 43 | |
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| 44 | #include "G4HadTmpUtil.hh" //lrint |
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| 45 | |
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| 46 | //#define debug_scatter |
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| 47 | |
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| 48 | G4QuasiElasticChannel::G4QuasiElasticChannel() |
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| 49 | { |
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| 50 | theQuasiElastic=G4QuasiFreeRatios::GetPointer(); |
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| 51 | } |
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| 52 | |
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| 53 | G4QuasiElasticChannel::~G4QuasiElasticChannel() |
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| 54 | {} |
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| 55 | |
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| 56 | G4double G4QuasiElasticChannel::GetFraction(G4Nucleus &theNucleus, |
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| 57 | const G4DynamicParticle & thePrimary) |
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| 58 | { |
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| 59 | std::pair<G4double,G4double> ratios; |
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| 60 | ratios=theQuasiElastic->GetRatios(thePrimary.GetTotalMomentum(), |
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| 61 | thePrimary.GetDefinition()->GetPDGEncoding(), |
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| 62 | G4lrint(theNucleus.GetZ()), |
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| 63 | G4lrint(theNucleus.GetN()-theNucleus.GetZ())); |
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| 64 | #ifdef debug_getFraction |
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| 65 | G4cout << "G4QuasiElasticChannel::ratios " << ratios.first << " x " <<ratios.second |
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| 66 | << " = " << ratios.first*ratios.second << G4endl; |
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| 67 | #endif |
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| 68 | |
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| 69 | return ratios.first*ratios.second; |
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| 70 | } |
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| 71 | |
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| 72 | G4KineticTrackVector * G4QuasiElasticChannel::Scatter(G4Nucleus &theNucleus, |
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| 73 | const G4DynamicParticle & thePrimary) |
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| 74 | { |
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| 75 | |
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| 76 | |
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| 77 | G4int A=G4lrint(theNucleus.GetN()); |
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| 78 | // G4int Z=G4lrint(theNucleus.GetZ()); |
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| 79 | // build Nucleus and choose random nucleon to scatter with |
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| 80 | the3DNucleus.Init(theNucleus.GetN(),theNucleus.GetZ()); |
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| 81 | const std::vector<G4Nucleon *> nucleons=the3DNucleus.GetNucleons(); |
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| 82 | |
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| 83 | G4int index; |
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| 84 | do { |
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| 85 | index=G4lrint((A-1)*G4UniformRand()); |
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| 86 | |
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| 87 | } while (index < 0 || index >= static_cast<G4int>(nucleons.size())); |
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| 88 | |
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| 89 | // G4double an=G4UniformRand()*A; |
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| 90 | G4ParticleDefinition * pDef= nucleons[index]->GetDefinition(); |
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| 91 | |
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| 92 | #ifdef debug_scatter |
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| 93 | G4cout << " neutron - proton? A, Z, an, pdg" <<" " |
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| 94 | << A <<" "<<G4lrint(theNucleus.GetZ()) |
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| 95 | << " "<<an <<" " << pDef->GetParticleName()<< G4endl; |
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| 96 | #endif |
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| 97 | // G4LorentzVector pNucleon(G4ThreeVector(0,0,0),pDef->GetPDGMass()); |
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| 98 | G4LorentzVector pNucleon=nucleons[index]->Get4Momentum(); |
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| 99 | |
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| 100 | std::pair<G4LorentzVector,G4LorentzVector> result; |
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| 101 | |
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| 102 | result=theQuasiElastic->Scatter(pDef->GetPDGEncoding(),pNucleon, |
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| 103 | thePrimary.GetDefinition()->GetPDGEncoding(), |
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| 104 | thePrimary.Get4Momentum()); |
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| 105 | |
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| 106 | if (result.first.e() == 0.) |
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| 107 | { |
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| 108 | G4cout << "Warning - G4QuasiElasticChannel::Scatter no scattering" << G4endl; |
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| 109 | return 0; //no scatter |
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| 110 | } |
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| 111 | |
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| 112 | #ifdef debug_scatter |
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| 113 | G4LorentzVector EpConservation=pNucleon+thePrimary.Get4Momentum() |
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| 114 | - result.first - result.second; |
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| 115 | if ( (EpConservation.vect().mag2() > 0.01*MeV*MeV ) |
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| 116 | || (std::abs(EpConservation.e()) > 0.1 * MeV ) ) |
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| 117 | { |
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| 118 | G4cout << "Warning - G4QuasiElasticChannel::Scatter E-p non conservation : " |
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| 119 | << EpConservation << G4endl; |
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| 120 | } |
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| 121 | #endif |
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| 122 | |
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| 123 | G4KineticTrackVector * ktv; |
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| 124 | ktv=new G4KineticTrackVector(); |
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| 125 | G4KineticTrack * sPrim=new G4KineticTrack(thePrimary.GetDefinition(), |
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| 126 | 0.,G4ThreeVector(0), result.second); |
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| 127 | ktv->push_back(sPrim); |
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| 128 | G4KineticTrack * sNuc=new G4KineticTrack(pDef, |
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| 129 | 0.,G4ThreeVector(0), result.first); |
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| 130 | ktv->push_back(sNuc); |
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| 131 | |
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| 132 | #ifdef debug_scatter |
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| 133 | G4cout << " scattered Nucleon : " << result.first << " mass " <<result.first.mag() << G4endl; |
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| 134 | G4cout << " scattered Project : " << result.second << " mass " <<result.second.mag() << G4endl; |
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| 135 | #endif |
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| 136 | return ktv; |
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| 137 | } |
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