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: G4Scatterer.cc,v 1.16 2010/03/12 15:45:18 gunter Exp $ // |
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27 | // |
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28 | |
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29 | #include "globals.hh" |
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30 | #include <vector> |
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31 | #include "G4ios.hh" |
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32 | #include "G4Scatterer.hh" |
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33 | #include "G4KineticTrack.hh" |
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34 | #include "G4ThreeVector.hh" |
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35 | #include "G4LorentzRotation.hh" |
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36 | #include "G4LorentzVector.hh" |
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37 | |
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38 | #include "G4CollisionNN.hh" |
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39 | #include "G4CollisionPN.hh" |
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40 | #include "G4CollisionMesonBaryon.hh" |
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41 | |
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42 | #include "G4CollisionInitialState.hh" |
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43 | #include "G4HadTmpUtil.hh" |
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44 | #include "G4Pair.hh" |
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45 | |
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46 | |
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47 | // Declare the categories of collisions the Scatterer can handle |
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48 | typedef GROUP2(G4CollisionNN, G4CollisionMesonBaryon) theChannels; |
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49 | |
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50 | |
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51 | G4Scatterer::G4Scatterer() |
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52 | { |
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53 | Register aR; |
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54 | G4ForEach<theChannels>::Apply(&aR, &collisions); |
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55 | } |
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56 | |
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57 | |
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58 | G4Scatterer::~G4Scatterer() |
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59 | { |
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60 | std::for_each(collisions.begin(), collisions.end(), G4Delete()); |
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61 | collisions.clear(); |
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62 | } |
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63 | |
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64 | G4double G4Scatterer::GetTimeToInteraction(const G4KineticTrack& trk1, |
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65 | const G4KineticTrack& trk2) |
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66 | { |
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67 | G4double time = DBL_MAX; |
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68 | G4double distance_fast; |
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69 | G4LorentzVector mom1 = trk1.GetTrackingMomentum(); |
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70 | // G4cout << "zcomp=" << std::abs(mom1.vect().unit().z() -1 ) << G4endl; |
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71 | G4double collisionTime; |
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72 | |
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73 | if ( std::abs(mom1.vect().unit().z() -1 ) < 1e-6 ) |
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74 | { |
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75 | G4ThreeVector position = trk2.GetPosition() - trk1.GetPosition(); |
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76 | G4double deltaz=position.z(); |
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77 | G4double velocity = mom1.z()/mom1.e() * c_light; |
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78 | |
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79 | collisionTime=deltaz/velocity; |
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80 | distance_fast=position.x()*position.x() + position.y()*position.y(); |
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81 | } else { |
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82 | |
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83 | // The nucleons of the nucleus are FROZEN, ie. do not move.. |
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84 | |
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85 | G4ThreeVector position = trk2.GetPosition() - trk1.GetPosition(); |
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86 | |
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87 | G4ThreeVector velocity = mom1.vect()/mom1.e() * c_light; // mom1.boostVector() will exit on slightly negative mass |
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88 | collisionTime = (position * velocity) / velocity.mag2(); // can't divide by /c_light; |
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89 | position -= velocity * collisionTime; |
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90 | distance_fast=position.mag2(); |
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91 | |
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92 | // if ( collisionTime>0 ) G4cout << " dis1/2 square" << dis1 <<" "<< dis2 << G4endl; |
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93 | // collisionTime = GetTimeToClosestApproach(trk1,trk2); |
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94 | } |
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95 | if (collisionTime > 0) |
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96 | { |
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97 | static const G4double maxCrossSection = 500*millibarn; |
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98 | if(0.7*pi*distance_fast>maxCrossSection) return time; |
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99 | |
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100 | |
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101 | G4LorentzVector mom2(0,0,0,trk2.Get4Momentum().mag()); |
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102 | |
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103 | // G4ThreeVector momLab = mom1.vect();// frozen Nucleus - mom2.vect(); |
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104 | // G4ThreeVector posLab = trk1.GetPosition() - trk2.GetPosition(); |
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105 | // G4double disLab=posLab * posLab - (posLab*momLab) * (posLab*momLab) /(momLab.mag2()); |
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106 | |
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107 | G4LorentzRotation toCMSFrame((-1)*(mom1 + mom2).boostVector()); |
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108 | mom1 = toCMSFrame * mom1; |
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109 | mom2 = toCMSFrame * mom2; |
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110 | |
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111 | G4LorentzVector coordinate1(trk1.GetPosition(), 100.); |
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112 | G4LorentzVector coordinate2(trk2.GetPosition(), 100.); |
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113 | G4ThreeVector pos = ((toCMSFrame * coordinate1).vect() - |
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114 | (toCMSFrame * coordinate2).vect()); |
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115 | |
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116 | G4ThreeVector mom = mom1.vect() - mom2.vect(); |
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117 | |
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118 | // Calculate the impact parameter |
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119 | |
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120 | G4double distance = pos * pos - (pos*mom) * (pos*mom) / (mom.mag2()); |
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121 | |
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122 | // G4cout << " disDiff " << distance-disLab << " " << disLab |
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123 | // << " " << std::abs(distance-disLab)/distance << G4endl |
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124 | // << " mom/Lab " << mom << " " << momLab << G4endl |
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125 | // << " pos/Lab " << pos << " " << posLab |
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126 | // << G4endl; |
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127 | |
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128 | if(pi*distance>maxCrossSection) return time; |
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129 | |
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130 | // charged particles special |
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131 | static const G4double maxChargedCrossSection = 200*millibarn; |
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132 | if(std::abs(trk1.GetDefinition()->GetPDGCharge())>0.1 && |
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133 | std::abs(trk2.GetDefinition()->GetPDGCharge())>0.1 && |
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134 | pi*distance>maxChargedCrossSection) return time; |
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135 | |
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136 | G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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137 | // neutrons special |
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138 | if(( trk1.GetDefinition() == G4Neutron::Neutron() || |
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139 | trk1.GetDefinition() == G4Neutron::Neutron() ) && |
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140 | sqrtS>1.91*GeV && pi*distance>maxChargedCrossSection) return time; |
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141 | |
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142 | /* |
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143 | * if(distance <= sqr(1.14*fermi)) |
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144 | * { |
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145 | * time = collisionTime; |
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146 | * |
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147 | * * |
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148 | * * G4cout << "Scatter distance/time: " << std::sqrt(distance)/fermi << |
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149 | * * " / "<< time/ns << G4endl; |
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150 | * * G4ThreeVector pos1=trk1.GetPosition(); |
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151 | * * G4ThreeVector pos2=trk2.GetPosition(); |
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152 | * * G4LorentzVector xmom1 = trk1.Get4Momentum(); |
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153 | * * G4LorentzVector xmom2 = trk2.Get4Momentum(); |
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154 | * * G4cout << "position1: " << pos1.x() << " " << pos1.y() << " " |
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155 | * * << pos1.z(); |
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156 | * * pos1+=(collisionTime*c_light/xmom1.e())*xmom1.vect(); |
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157 | * * G4cout << " straight line trprt: " |
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158 | * * << pos1.x() << " " << pos1.y() << " " |
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159 | * * << pos1.z() << G4endl; |
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160 | * * G4cout << "position2: " << pos2.x() << " " << pos2.y() << " " |
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161 | * * << pos2.z() << G4endl; |
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162 | * * G4cout << "straight line distance 2 fixed:" << (pos1-pos2).mag()/fermi << G4endl; |
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163 | * * pos2+= (collisionTime*c_light/xmom2.e())*xmom2.vect(); |
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164 | * * G4cout<< " straight line trprt: " |
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165 | * * << pos2.x() << " " << pos2.y() << " " |
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166 | * * << pos2.z() << G4endl; |
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167 | * * G4cout << "straight line distance :" << (pos1-pos2).mag()/fermi << G4endl; |
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168 | * * |
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169 | * } |
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170 | * |
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171 | * if(1) |
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172 | * return time; |
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173 | */ |
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174 | |
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175 | if ((trk1.GetActualMass()+trk2.GetActualMass()) > sqrtS) return time; |
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176 | |
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177 | |
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178 | |
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179 | G4VCollision* collision = FindCollision(trk1,trk2); |
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180 | G4double totalCrossSection; |
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181 | // The cross section is interpreted geometrically as an area |
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182 | // Two particles are assumed to collide if their distance is < (totalCrossSection/pi) |
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183 | |
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184 | if (collision != 0) |
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185 | { |
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186 | totalCrossSection = collision->CrossSection(trk1,trk2); |
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187 | if ( totalCrossSection > 0 ) |
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188 | { |
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189 | /* G4cout << " totalCrossection = "<< totalCrossSection << ", trk1/2, s, e-m: " |
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190 | * << trk1.GetDefinition()->GetParticleName() |
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191 | * << " / " |
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192 | * << trk2.GetDefinition()->GetParticleName() |
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193 | * << ", " |
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194 | * << (trk1.Get4Momentum()+trk2.Get4Momentum()).mag() |
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195 | * << ", " |
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196 | * << (trk1.Get4Momentum()+trk2.Get4Momentum()).mag()- |
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197 | * trk1.Get4Momentum().mag() - trk2.Get4Momentum().mag() |
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198 | * << G4endl; |
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199 | */ |
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200 | if (distance <= totalCrossSection / pi) |
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201 | { |
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202 | time = collisionTime; |
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203 | } |
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204 | } else |
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205 | { |
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206 | |
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207 | // For debugging... |
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208 | // G4cout << " totalCrossection = 0, trk1/2, s, e-m: " |
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209 | // << trk1.GetDefinition()->GetParticleName() |
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210 | // << " / " |
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211 | // << trk2.GetDefinition()->GetParticleName() |
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212 | // << ", " |
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213 | // << (trk1.Get4Momentum()+trk2.Get4Momentum()).mag() |
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214 | // << ", " |
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215 | // << (trk1.Get4Momentum()+trk2.Get4Momentum()).mag()- |
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216 | // trk1.Get4Momentum().mag() - trk2.Get4Momentum().mag() |
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217 | // << G4endl; |
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218 | |
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219 | } |
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220 | /* |
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221 | * if(distance <= sqr(5.*fermi)) |
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222 | * { |
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223 | * G4cout << " distance,xsect, std::sqrt(xsect/pi) : " << std::sqrt(distance)/fermi |
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224 | * << " " << totalCrossSection/sqr(fermi) |
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225 | * << " " << std::sqrt(totalCrossSection / pi)/fermi << G4endl; |
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226 | * } |
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227 | */ |
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228 | |
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229 | } |
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230 | else |
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231 | { |
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232 | time = DBL_MAX; |
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233 | // /* |
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234 | // For debugging |
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235 | //hpw G4cout << "G4Scatterer - collision not found: " |
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236 | //hpw << trk1.GetDefinition()->GetParticleName() |
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237 | //hpw << " - " |
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238 | //hpw << trk2.GetDefinition()->GetParticleName() |
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239 | //hpw << G4endl; |
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240 | // End of debugging |
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241 | // */ |
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242 | } |
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243 | } |
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244 | |
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245 | else |
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246 | { |
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247 | /* |
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248 | // For debugging |
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249 | G4cout << "G4Scatterer - negative collisionTime" |
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250 | << ": collisionTime = " << collisionTime |
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251 | << ", position = " << position |
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252 | << ", velocity = " << velocity |
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253 | << G4endl; |
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254 | // End of debugging |
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255 | */ |
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256 | } |
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257 | |
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258 | return time; |
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259 | } |
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260 | |
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261 | G4KineticTrackVector* G4Scatterer::Scatter(const G4KineticTrack& trk1, |
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262 | const G4KineticTrack& trk2) |
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263 | { |
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264 | // G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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265 | G4LorentzVector pInitial=trk1.Get4Momentum() + trk2.Get4Momentum(); |
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266 | G4double energyBalance = pInitial.t(); |
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267 | G4double pxBalance = pInitial.vect().x(); |
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268 | G4double pyBalance = pInitial.vect().y(); |
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269 | G4double pzBalance = pInitial.vect().z(); |
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270 | G4int chargeBalance = G4lrint(trk1.GetDefinition()->GetPDGCharge() |
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271 | + trk2.GetDefinition()->GetPDGCharge()); |
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272 | G4int baryonBalance = trk1.GetDefinition()->GetBaryonNumber() |
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273 | + trk2.GetDefinition()->GetBaryonNumber(); |
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274 | |
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275 | G4VCollision* collision = FindCollision(trk1,trk2); |
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276 | if (collision != 0) |
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277 | { |
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278 | G4double aCrossSection = collision->CrossSection(trk1,trk2); |
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279 | if (aCrossSection > 0.0) |
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280 | { |
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281 | |
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282 | |
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283 | #ifdef debug_G4Scatterer |
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284 | G4cout << "be4 FinalState 1(p,e,m): " |
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285 | << trk1.Get4Momentum() << " " |
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286 | << trk1.Get4Momentum().mag() |
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287 | << ", 2: " |
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288 | << trk2.Get4Momentum()<< " " |
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289 | << trk2.Get4Momentum().mag() << " " |
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290 | << G4endl; |
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291 | #endif |
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292 | |
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293 | |
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294 | G4KineticTrackVector* products = collision->FinalState(trk1,trk2); |
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295 | if(!products || products->size() == 0) return products; |
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296 | |
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297 | #ifdef debug_G4Scatterer |
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298 | G4cout << "size of FS: "<<products->size()<<G4endl; |
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299 | #endif |
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300 | |
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301 | G4KineticTrack *final= products->operator[](0); |
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302 | |
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303 | |
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304 | #ifdef debug_G4Scatterer |
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305 | G4cout << " FinalState 1: " |
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306 | << final->Get4Momentum()<< " " |
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307 | << final->Get4Momentum().mag() ; |
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308 | #endif |
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309 | |
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310 | if(products->size() == 1) return products; |
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311 | final=products->operator[](1); |
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312 | #ifdef debug_G4Scatterer |
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313 | G4cout << ", 2: " |
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314 | << final->Get4Momentum() << " " |
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315 | << final->Get4Momentum().mag() << " " << G4endl; |
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316 | #endif |
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317 | |
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318 | final= products->operator[](0); |
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319 | G4LorentzVector pFinal=final->Get4Momentum(); |
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320 | if(products->size()==2) |
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321 | { |
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322 | final=products->operator[](1); |
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323 | pFinal +=final->Get4Momentum(); |
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324 | } |
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325 | |
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326 | #ifdef debug_G4Scatterer |
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327 | if ( (pInitial-pFinal).mag() > 0.1*MeV ) |
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328 | { |
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329 | G4cout << "G4Scatterer: momentum imbalance, pInitial= " <<pInitial << " pFinal= " <<pFinal<< G4endl; |
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330 | } |
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331 | G4cout << "Scatterer costh= " << trk1.Get4Momentum().vect().unit() *(products->operator[](0))->Get4Momentum().vect().unit()<< G4endl; |
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332 | #endif |
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333 | |
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334 | for(size_t hpw=0; hpw<products->size(); hpw++) |
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335 | { |
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336 | energyBalance-=products->operator[](hpw)->Get4Momentum().t(); |
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337 | pxBalance-=products->operator[](hpw)->Get4Momentum().vect().x(); |
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338 | pyBalance-=products->operator[](hpw)->Get4Momentum().vect().y(); |
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339 | pzBalance-=products->operator[](hpw)->Get4Momentum().vect().z(); |
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340 | chargeBalance-=G4lrint(products->operator[](hpw)->GetDefinition()->GetPDGCharge()); |
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341 | baryonBalance-=products->operator[](hpw)->GetDefinition()->GetBaryonNumber(); |
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342 | } |
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343 | if(getenv("ScattererEnergyBalanceCheck")) |
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344 | std::cout << "DEBUGGING energy balance A: " |
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345 | <<energyBalance<<" " |
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346 | <<pxBalance<<" " |
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347 | <<pyBalance<<" " |
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348 | <<pzBalance<<" " |
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349 | <<chargeBalance<<" " |
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350 | <<baryonBalance<<" " |
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351 | <<G4endl; |
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352 | if(chargeBalance !=0 ) |
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353 | { |
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354 | G4cout << "track 1"<<trk1.GetDefinition()->GetParticleName()<<G4endl; |
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355 | G4cout << "track 2"<<trk2.GetDefinition()->GetParticleName()<<G4endl; |
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356 | for(size_t hpw=0; hpw<products->size(); hpw++) |
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357 | { |
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358 | G4cout << products->operator[](hpw)->GetDefinition()->GetParticleName()<<G4endl; |
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359 | } |
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360 | G4Exception("We have the problem"); |
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361 | } |
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362 | return products; |
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363 | } |
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364 | } |
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365 | |
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366 | return NULL; |
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367 | } |
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368 | |
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369 | |
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370 | G4VCollision* G4Scatterer::FindCollision(const G4KineticTrack& trk1, |
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371 | const G4KineticTrack& trk2) |
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372 | { |
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373 | G4VCollision* collisionInCharge = 0; |
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374 | |
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375 | size_t i; |
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376 | for (i=0; i<collisions.size(); i++) |
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377 | { |
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378 | G4VCollision* component = collisions[i]; |
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379 | if (component->IsInCharge(trk1,trk2)) |
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380 | { |
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381 | collisionInCharge = component; |
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382 | break; |
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383 | } |
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384 | } |
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385 | // if(collisionInCharge) |
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386 | // { |
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387 | // G4cout << "found collision : " |
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388 | // << collisionInCharge->GetName()<< " " |
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389 | // << "for " |
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390 | // << trk1.GetDefinition()->GetParticleName()<<" + " |
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391 | // << trk2.GetDefinition()->GetParticleName()<<" " |
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392 | // << G4endl;; |
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393 | // } |
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394 | return collisionInCharge; |
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395 | } |
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396 | |
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397 | G4double G4Scatterer::GetCrossSection(const G4KineticTrack& trk1, |
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398 | const G4KineticTrack& trk2) |
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399 | { |
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400 | G4VCollision* collision = FindCollision(trk1,trk2); |
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401 | G4double aCrossSection = 0; |
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402 | if (collision != 0) |
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403 | { |
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404 | aCrossSection = collision->CrossSection(trk1,trk2); |
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405 | } |
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406 | return aCrossSection; |
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407 | } |
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408 | |
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409 | |
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410 | const std::vector<G4CollisionInitialState *> & G4Scatterer:: |
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411 | GetCollisions(G4KineticTrack * aProjectile, |
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412 | std::vector<G4KineticTrack *> & someCandidates, |
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413 | G4double aCurrentTime) |
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414 | { |
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415 | theCollisions.clear(); |
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416 | std::vector<G4KineticTrack *>::iterator j=someCandidates.begin(); |
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417 | for(; j != someCandidates.end(); ++j) |
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418 | { |
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419 | G4double collisionTime = GetTimeToInteraction(*aProjectile, **j); |
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420 | if(collisionTime == DBL_MAX) // no collision |
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421 | { |
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422 | continue; |
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423 | } |
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424 | G4KineticTrackVector aTarget; |
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425 | aTarget.push_back(*j); |
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426 | theCollisions.push_back( |
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427 | new G4CollisionInitialState(collisionTime+aCurrentTime, aProjectile, aTarget, this) ); |
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428 | // G4cerr <<" !!!!!! debug collisions "<<collisionTime<<" "<<pkt->GetDefinition()->GetParticleName()<<G4endl; |
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429 | } |
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430 | return theCollisions; |
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431 | } |
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432 | |
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433 | |
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434 | G4KineticTrackVector * G4Scatterer:: |
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435 | GetFinalState(G4KineticTrack * aProjectile, |
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436 | std::vector<G4KineticTrack *> & theTargets) |
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437 | { |
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438 | G4KineticTrack target_reloc(*(theTargets[0])); |
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439 | return Scatter(*aProjectile, target_reloc); |
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440 | } |
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