[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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[1315] | 26 | // $Id: G4Scatterer.cc,v 1.16 2010/03/12 15:45:18 gunter Exp $ // |
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[819] | 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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