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 1.9 2010/03/12 15:45:18 gunter 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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