[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: G4CollisionComposite.cc,v 1.7 2007/07/05 21:43:24 dennis Exp $ // |
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| 28 | |
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| 29 | #include "globals.hh" |
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| 30 | #include "G4CollisionComposite.hh" |
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| 31 | #include "G4VCollision.hh" |
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| 32 | #include "G4CollisionVector.hh" |
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| 33 | #include "G4KineticTrack.hh" |
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| 34 | #include "G4KineticTrackVector.hh" |
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| 35 | #include "G4VCrossSectionSource.hh" |
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| 36 | #include "G4HadTmpUtil.hh" |
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| 37 | |
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| 38 | const G4int G4CollisionComposite::nPoints = 32; |
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| 39 | |
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| 40 | G4double G4CollisionComposite::theT[nPoints] = |
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| 41 | {.01, .03, .05, .1, .15, .2, .3, .4, .5, .6, .7, .8, .9, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, 8.0, 10., 15, 20, 50, 100}; |
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| 42 | |
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| 43 | G4CollisionComposite::G4CollisionComposite() |
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| 44 | { |
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| 45 | } |
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| 46 | |
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| 47 | |
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| 48 | G4CollisionComposite::~G4CollisionComposite() |
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| 49 | { |
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| 50 | std::for_each(components.begin(), components.end(), G4Delete()); |
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| 51 | } |
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| 52 | |
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| 53 | |
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| 54 | G4double G4CollisionComposite::CrossSection(const G4KineticTrack& trk1, |
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| 55 | const G4KineticTrack& trk2) const |
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| 56 | { |
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| 57 | G4double crossSect = 0.; |
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| 58 | const G4VCrossSectionSource* xSource = GetCrossSectionSource(); |
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| 59 | if (xSource != 0) |
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| 60 | // There is a total cross section for this Collision |
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| 61 | { |
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| 62 | crossSect = xSource->CrossSection(trk1,trk2); |
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| 63 | } |
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| 64 | else |
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| 65 | { |
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| 66 | // waiting for mutable to enable buffering. |
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| 67 | const_cast<G4CollisionComposite *>(this)->BufferCrossSection(trk1.GetDefinition(), trk2.GetDefinition()); |
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| 68 | // G4cerr << "Buffer filled, reying with sqrts = "<< (trk1.Get4Momentum()+trk2.Get4Momentum()).mag() <<G4endl; |
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| 69 | crossSect = BufferedCrossSection(trk1,trk2); |
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| 70 | } |
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| 71 | return crossSect; |
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| 72 | } |
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| 73 | |
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| 74 | |
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| 75 | G4KineticTrackVector* G4CollisionComposite::FinalState(const G4KineticTrack& trk1, |
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| 76 | const G4KineticTrack& trk2) const |
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| 77 | { |
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| 78 | std::vector<G4double> cxCache; |
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| 79 | G4double partialCxSum = 0.0; |
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| 80 | |
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| 81 | size_t i; |
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| 82 | for (i=0; i<components.size(); i++) |
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| 83 | { |
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| 84 | G4double partialCx; |
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| 85 | // cout << "comp" << i << " " << components[i]()->GetName(); |
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| 86 | if (components[i]->IsInCharge(trk1,trk2)) |
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| 87 | { |
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| 88 | partialCx = components[i]->CrossSection(trk1,trk2); |
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| 89 | } |
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| 90 | else |
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| 91 | { |
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| 92 | partialCx = 0.0; |
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| 93 | } |
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| 94 | // cout << " cx=" << partialCx << endl; |
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| 95 | partialCxSum += partialCx; |
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| 96 | cxCache.push_back(partialCx); |
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| 97 | } |
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| 98 | |
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| 99 | G4double random = G4UniformRand()*partialCxSum; |
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| 100 | G4double running = 0; |
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| 101 | for (i=0; i<cxCache.size(); i++) |
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| 102 | { |
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| 103 | running += cxCache[i]; |
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| 104 | if (running > random) |
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| 105 | { |
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| 106 | return components[i]->FinalState(trk1, trk2); |
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| 107 | } |
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| 108 | } |
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| 109 | // G4cerr <<"in charge = "<<IsInCharge(trk1, trk2)<<G4endl; |
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| 110 | // G4cerr <<"Cross-section = "<<CrossSection(trk1, trk2)/millibarn<<" "<<running<<" "<<cxCache.size()<<G4endl; |
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| 111 | // G4cerr <<"Names = "<<trk1.GetDefinition()->GetParticleName()<<", "<<trk2.GetDefinition()->GetParticleName()<<G4endl; |
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| 112 | // throw G4HadronicException(__FILE__, __LINE__, "G4CollisionComposite: no final state found!"); |
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| 113 | return NULL; |
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| 114 | } |
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| 115 | |
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| 116 | |
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| 117 | G4bool G4CollisionComposite::IsInCharge(const G4KineticTrack& trk1, |
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| 118 | const G4KineticTrack& trk2) const |
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| 119 | { |
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| 120 | G4bool isInCharge = false; |
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| 121 | |
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| 122 | // The composite is in charge if any of its components is in charge |
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| 123 | |
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| 124 | const G4CollisionVector* comps = GetComponents(); |
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| 125 | if (comps) |
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| 126 | { |
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| 127 | G4CollisionVector::const_iterator iter; |
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| 128 | for (iter = comps->begin(); iter != comps->end(); ++iter) |
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| 129 | { |
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| 130 | if ( ((*iter))->IsInCharge(trk1,trk2) ) isInCharge = true; |
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| 131 | } |
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| 132 | } |
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| 133 | |
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| 134 | return isInCharge; |
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| 135 | } |
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| 136 | |
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| 137 | void G4CollisionComposite:: |
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| 138 | BufferCrossSection(const G4ParticleDefinition * aP, const G4ParticleDefinition * bP) |
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| 139 | { |
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| 140 | // check if already buffered |
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| 141 | size_t i; |
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| 142 | for(i=0; i<theBuffer.size(); i++) |
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| 143 | { |
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| 144 | if(theBuffer[i].InCharge(aP, bP)) return; |
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| 145 | } |
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| 146 | // G4cerr << "Buffering for "<<aP->GetParticleName()<<" "<<bP->GetParticleName()<<G4endl; |
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| 147 | |
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| 148 | // buffer the new one. |
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| 149 | G4CrossSectionBuffer aNewBuff(aP, bP); |
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| 150 | size_t maxE=nPoints; |
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| 151 | for(size_t tt=0; tt<maxE; tt++) |
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| 152 | { |
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| 153 | G4double aT = theT[tt]*GeV; |
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| 154 | G4double crossSect = 0; |
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| 155 | // The total cross-section is summed over all the component channels |
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| 156 | |
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| 157 | G4double atime = 0; |
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| 158 | G4ThreeVector aPosition(0,0,0); |
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| 159 | G4double aM = aP->GetPDGMass(); |
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| 160 | G4double aE = aM+aT; |
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| 161 | G4ThreeVector aMom(0,0,std::sqrt(aE*aE-aM*aM)); |
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| 162 | G4LorentzVector a4Momentum(aE, aMom); |
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| 163 | G4KineticTrack a(const_cast<G4ParticleDefinition *>(aP), atime, aPosition, a4Momentum); |
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| 164 | |
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| 165 | G4double btime = 0; |
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| 166 | G4ThreeVector bPosition(0,0,0); |
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| 167 | G4ThreeVector bMom(0,0,0*MeV); |
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| 168 | G4double bE = bP->GetPDGMass(); |
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| 169 | G4LorentzVector b4Momentum(bE, bMom); |
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| 170 | G4KineticTrack b(const_cast<G4ParticleDefinition *>(bP), btime, bPosition, b4Momentum); |
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| 171 | |
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| 172 | for (i=0; i<components.size(); i++) |
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| 173 | { |
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| 174 | if(components[i]->IsInCharge(a,b)) |
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| 175 | { |
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| 176 | crossSect += components[i]->CrossSection(a,b); |
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| 177 | } |
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| 178 | } |
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| 179 | G4double sqrts = (a4Momentum+b4Momentum).mag(); |
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| 180 | aNewBuff.push_back(sqrts, crossSect); |
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| 181 | } |
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| 182 | theBuffer.push_back(aNewBuff); |
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| 183 | // theBuffer.back().Print(); |
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| 184 | } |
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| 185 | |
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| 186 | |
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| 187 | G4double G4CollisionComposite:: |
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| 188 | BufferedCrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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| 189 | { |
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| 190 | for(size_t i=0; i<theBuffer.size(); i++) |
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| 191 | { |
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| 192 | if(theBuffer[i].InCharge(trk1.GetDefinition(), trk2.GetDefinition())) |
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| 193 | { |
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| 194 | return theBuffer[i].CrossSection(trk1, trk2); |
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| 195 | } |
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| 196 | } |
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| 197 | throw G4HadronicException(__FILE__, __LINE__, "G4CollisionComposite::BufferedCrossSection - Blitz !!"); |
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| 198 | return 0; |
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| 199 | } |
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| 200 | |
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