[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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[962] | 26 | // 080602 Fix memory leaks by T. Koi |
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| 27 | // 081120 Add deltaT in signature of CalKinematicsOfBinaryCollisions |
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| 28 | // Add several required updating of Mean Filed |
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| 29 | // Modified handling of absorption case by T. Koi |
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[1055] | 30 | // 090126 Fix in absorption case by T. Koi |
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| 31 | // 090331 Fix for gamma participant by T. Koi |
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[962] | 32 | // |
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[819] | 33 | #include "G4QMDCollision.hh" |
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| 34 | #include "G4Scatterer.hh" |
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| 35 | #include "Randomize.hh" |
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| 36 | |
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| 37 | G4QMDCollision::G4QMDCollision() |
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| 38 | : deltar ( 4 ) |
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| 39 | , bcmax0 ( 1.323142 ) // NN maximum impact parameter |
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| 40 | , bcmax1 ( 2.523 ) // others maximum impact parameter |
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| 41 | , sig0 ( 55 ) // NN cross section |
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| 42 | , sig1 ( 200 ) // others cross section |
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| 43 | , epse ( 0.0001 ) |
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| 44 | { |
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| 45 | theScatterer = new G4Scatterer(); |
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| 46 | } |
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| 47 | |
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| 48 | |
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| 49 | |
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| 50 | G4QMDCollision::~G4QMDCollision() |
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| 51 | { |
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| 52 | delete theScatterer; |
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| 53 | } |
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| 54 | |
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| 55 | |
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[962] | 56 | void G4QMDCollision::CalKinematicsOfBinaryCollisions( G4double dt ) |
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[819] | 57 | { |
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[962] | 58 | G4double deltaT = dt; |
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[819] | 59 | |
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| 60 | G4int n = theSystem->GetTotalNumberOfParticipant(); |
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[962] | 61 | //081118 |
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| 62 | //G4int nb = 0; |
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| 63 | for ( G4int i = 0 ; i < n ; i++ ) |
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| 64 | { |
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| 65 | theSystem->GetParticipant( i )->UnsetHitMark(); |
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| 66 | theSystem->GetParticipant( i )->UnsetHitMark(); |
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| 67 | //nb += theSystem->GetParticipant( i )->GetBaryonNumber(); |
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| 68 | } |
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| 69 | //G4cout << "nb = " << nb << " n = " << n << G4endl; |
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[819] | 70 | |
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[962] | 71 | |
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[819] | 72 | //071101 |
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| 73 | for ( G4int i = 0 ; i < n ; i++ ) |
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| 74 | { |
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[962] | 75 | |
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[819] | 76 | //std::cout << i << " " << theSystem->GetParticipant( i )->GetDefinition()->GetParticleName() << " " << theSystem->GetParticipant( i )->GetPosition() << std::endl; |
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[962] | 77 | |
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[819] | 78 | if ( theSystem->GetParticipant( i )->GetDefinition()->IsShortLived() ) |
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| 79 | { |
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[962] | 80 | |
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| 81 | G4bool decayed = false; |
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| 82 | |
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[819] | 83 | G4ParticleDefinition* pd0 = theSystem->GetParticipant( i )->GetDefinition(); |
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| 84 | G4ThreeVector p0 = theSystem->GetParticipant( i )->GetMomentum(); |
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| 85 | G4ThreeVector r0 = theSystem->GetParticipant( i )->GetPosition(); |
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| 86 | |
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| 87 | G4LorentzVector p40 = theSystem->GetParticipant( i )->Get4Momentum(); |
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| 88 | |
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[962] | 89 | G4double eini = theMeanField->GetTotalPotential() + p40.e(); |
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[819] | 90 | |
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| 91 | G4int n0 = theSystem->GetTotalNumberOfParticipant(); |
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| 92 | G4int i0 = 0; |
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[962] | 93 | |
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| 94 | G4bool isThisEnergyOK = false; |
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| 95 | |
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[819] | 96 | for ( G4int ii = 0 ; ii < 4 ; ii++ ) |
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[962] | 97 | { |
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[819] | 98 | |
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[962] | 99 | //G4LorentzVector p4 = theSystem->GetParticipant( i )->Get4Momentum(); |
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| 100 | G4LorentzVector p400 = p40; |
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[819] | 101 | |
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[962] | 102 | p400 *= GeV; |
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| 103 | //G4KineticTrack kt( theSystem->GetParticipant( i )->GetDefinition() , 0.0 , (theSystem->GetParticipant( i )->GetPosition())*fermi , p4 ); |
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| 104 | G4KineticTrack kt( pd0 , 0.0 , r0*fermi , p400 ); |
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| 105 | //std::cout << "G4KineticTrack " << i << " " << kt.GetDefinition()->GetParticleName() << kt.GetPosition() << std::endl; |
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| 106 | G4KineticTrackVector* secs = NULL; |
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| 107 | secs = kt.Decay(); |
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| 108 | G4int id = 0; |
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| 109 | G4double et = 0; |
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| 110 | if ( secs ) |
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[819] | 111 | { |
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[962] | 112 | for ( G4KineticTrackVector::iterator it |
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| 113 | = secs->begin() ; it != secs->end() ; it++ ) |
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| 114 | { |
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| 115 | /* |
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| 116 | G4cout << "G4KineticTrack" |
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| 117 | << " " << (*it)->GetDefinition()->GetParticleName() |
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| 118 | << " " << (*it)->Get4Momentum() |
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| 119 | << " " << (*it)->GetPosition()/fermi |
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| 120 | << G4endl; |
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| 121 | */ |
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| 122 | if ( id == 0 ) |
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[819] | 123 | { |
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[962] | 124 | theSystem->GetParticipant( i )->SetDefinition( (*it)->GetDefinition() ); |
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| 125 | theSystem->GetParticipant( i )->SetMomentum( (*it)->Get4Momentum().v()/GeV ); |
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| 126 | theSystem->GetParticipant( i )->SetPosition( (*it)->GetPosition()/fermi ); |
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| 127 | //theMeanField->Cal2BodyQuantities( i ); |
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| 128 | et += (*it)->Get4Momentum().e()/GeV; |
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[819] | 129 | } |
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[962] | 130 | if ( id > 0 ) |
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| 131 | { |
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| 132 | // Append end; |
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| 133 | theSystem->SetParticipant ( new G4QMDParticipant ( (*it)->GetDefinition() , (*it)->Get4Momentum().v()/GeV , (*it)->GetPosition()/fermi ) ); |
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| 134 | et += (*it)->Get4Momentum().e()/GeV; |
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| 135 | if ( id > 1 ) |
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| 136 | { |
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| 137 | //081118 |
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| 138 | //G4cout << "G4QMDCollision id >2; id= " << id << G4endl; |
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| 139 | } |
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| 140 | } |
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| 141 | id++; // number of daughter particles |
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[819] | 142 | |
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[962] | 143 | delete *it; |
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| 144 | } |
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| 145 | |
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| 146 | theMeanField->Update(); |
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| 147 | i0 = id-1; // 0 enter to i |
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| 148 | |
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| 149 | delete secs; |
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[819] | 150 | } |
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| 151 | |
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[962] | 152 | // EnergyCheck |
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[819] | 153 | |
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[962] | 154 | G4double efin = theMeanField->GetTotalPotential() + et; |
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| 155 | //std::cout << std::abs ( eini - efin ) - epse << std::endl; |
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| 156 | // std::cout << std::abs ( eini - efin ) - epse*10 << std::endl; |
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| 157 | // *10 TK |
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| 158 | if ( std::abs ( eini - efin ) < epse*10 ) |
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[819] | 159 | { |
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[962] | 160 | // Energy OK |
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| 161 | isThisEnergyOK = true; |
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| 162 | break; |
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[819] | 163 | } |
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[962] | 164 | else |
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| 165 | { |
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| 166 | |
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| 167 | theSystem->GetParticipant( i )->SetDefinition( pd0 ); |
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| 168 | theSystem->GetParticipant( i )->SetPosition( r0 ); |
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| 169 | theSystem->GetParticipant( i )->SetMomentum( p0 ); |
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| 170 | |
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| 171 | for ( G4int i0i = 0 ; i0i < id-1 ; i0i++ ) |
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| 172 | { |
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| 173 | //081118 |
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| 174 | //std::cout << "Decay Energitically Blocked deleteing " << i0i+n0 << std::endl; |
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| 175 | theSystem->DeleteParticipant( i0i+n0 ); |
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| 176 | } |
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| 177 | //081103 |
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| 178 | theMeanField->Update(); |
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| 179 | } |
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| 180 | |
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[819] | 181 | } |
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| 182 | |
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[962] | 183 | |
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[819] | 184 | // Pauli Check |
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| 185 | if ( isThisEnergyOK == true ) |
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| 186 | { |
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[962] | 187 | if ( theMeanField->IsPauliBlocked ( i ) != true ) |
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[819] | 188 | { |
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[962] | 189 | |
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| 190 | G4bool allOK = true; |
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[819] | 191 | for ( G4int i0i = 0 ; i0i < i0 ; i0i++ ) |
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| 192 | { |
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| 193 | if ( theMeanField->IsPauliBlocked ( i0i+n0 ) == true ) |
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| 194 | { |
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| 195 | allOK = false; |
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| 196 | break; |
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| 197 | } |
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| 198 | } |
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| 199 | |
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[962] | 200 | if ( allOK ) |
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| 201 | { |
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| 202 | decayed = true; //Decay Succeeded |
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| 203 | } |
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[819] | 204 | } |
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[962] | 205 | |
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[819] | 206 | } |
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| 207 | // |
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| 208 | |
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[962] | 209 | if ( decayed ) |
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| 210 | { |
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| 211 | //081119 |
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| 212 | //G4cout << "Decay Suceeded! " << std::endl; |
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| 213 | theSystem->GetParticipant( i )->SetHitMark(); |
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| 214 | for ( G4int i0i = 0 ; i0i < i0 ; i0i++ ) |
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| 215 | { |
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| 216 | theSystem->GetParticipant( i0i+n0 )->SetHitMark(); |
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| 217 | } |
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[819] | 218 | |
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[962] | 219 | } |
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| 220 | else |
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[819] | 221 | { |
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[962] | 222 | |
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| 223 | // Decay Blocked and re-enter orginal participant; |
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| 224 | |
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| 225 | if ( isThisEnergyOK == true ) // for false case already done |
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| 226 | { |
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| 227 | |
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| 228 | theSystem->GetParticipant( i )->SetDefinition( pd0 ); |
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| 229 | theSystem->GetParticipant( i )->SetPosition( r0 ); |
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| 230 | theSystem->GetParticipant( i )->SetMomentum( p0 ); |
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| 231 | |
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| 232 | for ( G4int i0i = 0 ; i0i < i0 ; i0i++ ) |
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| 233 | { |
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| 234 | //081118 |
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| 235 | //std::cout << "Decay Blocked deleteing " << i0i+n0 << std::endl; |
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| 236 | theSystem->DeleteParticipant( i0i+n0 ); |
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| 237 | } |
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| 238 | //081103 |
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| 239 | theMeanField->Update(); |
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| 240 | } |
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| 241 | |
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[819] | 242 | } |
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[962] | 243 | |
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| 244 | } //shortlive |
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| 245 | } // go next participant |
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[819] | 246 | //071101 |
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| 247 | |
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| 248 | |
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| 249 | n = theSystem->GetTotalNumberOfParticipant(); |
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| 250 | |
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[962] | 251 | //081118 |
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| 252 | //for ( G4int i = 1 ; i < n ; i++ ) |
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| 253 | for ( G4int i = 1 ; i < theSystem->GetTotalNumberOfParticipant() ; i++ ) |
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[819] | 254 | { |
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| 255 | |
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| 256 | //std::cout << "Collision i " << i << std::endl; |
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[962] | 257 | if ( theSystem->GetParticipant( i )->IsThisHit() ) continue; |
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[819] | 258 | |
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| 259 | G4ThreeVector ri = theSystem->GetParticipant( i )->GetPosition(); |
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| 260 | G4LorentzVector p4i = theSystem->GetParticipant( i )->Get4Momentum(); |
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| 261 | G4double rmi = theSystem->GetParticipant( i )->GetMass(); |
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| 262 | G4ParticleDefinition* pdi = theSystem->GetParticipant( i )->GetDefinition(); |
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[1055] | 263 | //090331 gamma |
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| 264 | if ( pdi->GetPDGMass() == 0.0 ) continue; |
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[819] | 265 | |
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| 266 | //std::cout << " p4i00 " << p4i << std::endl; |
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| 267 | for ( G4int j = 0 ; j < i ; j++ ) |
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| 268 | { |
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| 269 | |
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[962] | 270 | |
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[819] | 271 | /* |
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| 272 | std::cout << "Collision " << i << " " << theSystem->GetParticipant( i )->IsThisProjectile() << std::endl; |
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| 273 | std::cout << "Collision " << j << " " << theSystem->GetParticipant( j )->IsThisProjectile() << std::endl; |
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| 274 | std::cout << "Collision " << i << " " << theSystem->GetParticipant( i )->IsThisTarget() << std::endl; |
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| 275 | std::cout << "Collision " << j << " " << theSystem->GetParticipant( j )->IsThisTarget() << std::endl; |
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| 276 | */ |
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| 277 | |
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| 278 | // Only 1 Collision allowed for each particle in a time step. |
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[962] | 279 | //081119 |
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| 280 | if ( theSystem->GetParticipant( i )->IsThisHit() ) continue; |
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| 281 | if ( theSystem->GetParticipant( j )->IsThisHit() ) continue; |
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[819] | 282 | |
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[962] | 283 | //std::cout << "Collision " << i << " " << j << std::endl; |
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| 284 | |
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[819] | 285 | // Do not allow collision between nucleons in target/projectile til its first collision. |
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| 286 | if ( theSystem->GetParticipant( i )->IsThisProjectile() ) |
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| 287 | { |
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| 288 | if ( theSystem->GetParticipant( j )->IsThisProjectile() ) continue; |
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| 289 | } |
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| 290 | else if ( theSystem->GetParticipant( i )->IsThisTarget() ) |
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| 291 | { |
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| 292 | if ( theSystem->GetParticipant( j )->IsThisTarget() ) continue; |
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| 293 | } |
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| 294 | |
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| 295 | |
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| 296 | G4ThreeVector rj = theSystem->GetParticipant( j )->GetPosition(); |
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| 297 | G4LorentzVector p4j = theSystem->GetParticipant( j )->Get4Momentum(); |
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| 298 | G4double rmj = theSystem->GetParticipant( j )->GetMass(); |
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| 299 | G4ParticleDefinition* pdj = theSystem->GetParticipant( j )->GetDefinition(); |
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[1055] | 300 | //090331 gamma |
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| 301 | if ( pdj->GetPDGMass() == 0.0 ) continue; |
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[819] | 302 | |
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| 303 | G4double rr2 = theMeanField->GetRR2( i , j ); |
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| 304 | |
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| 305 | // Here we assume elab (beam momentum less than 5 GeV/n ) |
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| 306 | if ( rr2 > deltar*deltar ) continue; |
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| 307 | |
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| 308 | G4double s = (p4i+p4j)*(p4i+p4j); |
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| 309 | |
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| 310 | G4double srt = std::sqrt ( s ); |
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| 311 | |
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| 312 | G4double cutoff = 0.0; |
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| 313 | G4double bcmax = 0.0; |
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| 314 | G4double sig = 0.0; |
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| 315 | |
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| 316 | if ( rmi < 0.94 && rmj < 0.94 ) |
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| 317 | { |
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| 318 | // nucleon or pion case |
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| 319 | cutoff = rmi + rmj + 0.02; |
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| 320 | bcmax = bcmax0; |
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| 321 | sig = sig0; |
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| 322 | } |
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| 323 | else |
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| 324 | { |
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| 325 | cutoff = rmi + rmj; |
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| 326 | bcmax = bcmax1; |
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| 327 | sig = sig1; |
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| 328 | } |
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| 329 | |
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| 330 | //std::cout << "Collision cutoff " << i << " " << j << " " << cutoff << std::endl; |
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| 331 | if ( srt < cutoff ) continue; |
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| 332 | |
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| 333 | G4ThreeVector dr = ri - rj; |
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| 334 | G4double rsq = dr*dr; |
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| 335 | |
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| 336 | G4double pij = p4i*p4j; |
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| 337 | G4double pidr = p4i.vect()*dr; |
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| 338 | G4double pjdr = p4j.vect()*dr; |
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[1055] | 339 | |
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[819] | 340 | G4double aij = 1.0 - ( rmi*rmj /pij ) * ( rmi*rmj /pij ); |
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| 341 | G4double bij = pidr / rmi - pjdr*rmi/pij; |
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| 342 | G4double cij = rsq + ( pidr / rmi ) * ( pidr / rmi ); |
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| 343 | G4double brel = std::sqrt ( std::abs ( cij - bij*bij/aij ) ); |
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| 344 | |
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| 345 | if ( brel > bcmax ) continue; |
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| 346 | //std::cout << "collisions3 " << std::endl; |
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| 347 | |
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| 348 | G4double bji = -pjdr/rmj + pidr * rmj /pij; |
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| 349 | |
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| 350 | G4double ti = ( pidr/rmi - bij / aij ) * p4i.e() / rmi; |
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| 351 | G4double tj = (-pjdr/rmj - bji / aij ) * p4j.e() / rmj; |
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| 352 | |
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| 353 | |
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| 354 | /* |
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| 355 | std::cout << "collisions4 p4i " << p4i << std::endl; |
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| 356 | std::cout << "collisions4 ri " << ri << std::endl; |
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| 357 | std::cout << "collisions4 p4j " << p4j << std::endl; |
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| 358 | std::cout << "collisions4 rj " << rj << std::endl; |
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| 359 | std::cout << "collisions4 dr " << dr << std::endl; |
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| 360 | std::cout << "collisions4 pij " << pij << std::endl; |
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| 361 | std::cout << "collisions4 aij " << aij << std::endl; |
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| 362 | std::cout << "collisions4 bij bji " << bij << " " << bji << std::endl; |
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| 363 | std::cout << "collisions4 pidr pjdr " << pidr << " " << pjdr << std::endl; |
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| 364 | std::cout << "collisions4 p4i.e() p4j.e() " << p4i.e() << " " << p4j.e() << std::endl; |
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| 365 | std::cout << "collisions4 rmi rmj " << rmi << " " << rmj << std::endl; |
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| 366 | std::cout << "collisions4 " << ti << " " << tj << std::endl; |
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| 367 | */ |
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| 368 | if ( std::abs ( ti + tj ) > deltaT ) continue; |
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| 369 | //std::cout << "collisions4 " << std::endl; |
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| 370 | |
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| 371 | G4ThreeVector beta = ( p4i + p4j ).boostVector(); |
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| 372 | |
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| 373 | G4LorentzVector p = p4i; |
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| 374 | G4LorentzVector p4icm = p.boost( p.findBoostToCM ( p4j ) ); |
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| 375 | G4ThreeVector pcm = p4icm.vect(); |
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| 376 | |
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| 377 | G4double prcm = pcm.mag(); |
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| 378 | |
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| 379 | if ( prcm <= 0.00001 ) continue; |
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| 380 | //std::cout << "collisions5 " << std::endl; |
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| 381 | |
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| 382 | G4bool energetically_forbidden = !( CalFinalStateOfTheBinaryCollision ( i , j ) ); // Use Geant4 Collision Library |
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| 383 | //G4bool energetically_forbidden = !( CalFinalStateOfTheBinaryCollisionJQMD ( sig , cutoff , pcm , prcm , srt, beta , gamma , i , j ) ); // JQMD Elastic |
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| 384 | |
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[962] | 385 | /* |
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[819] | 386 | G4bool pauli_blocked = false; |
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[962] | 387 | if ( energetically_forbidden == false ) // result true |
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[819] | 388 | { |
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| 389 | if ( theMeanField->IsPauliBlocked ( i ) == true || theMeanField->IsPauliBlocked ( j ) == true ) |
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| 390 | { |
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| 391 | pauli_blocked = true; |
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| 392 | //std::cout << "G4QMDRESULT Collsion Pauli Blocked " << std::endl; |
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| 393 | } |
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| 394 | } |
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| 395 | else |
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| 396 | { |
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[962] | 397 | if ( theMeanField->IsPauliBlocked ( i ) == true || theMeanField->IsPauliBlocked ( j ) == true ) |
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| 398 | pauli_blocked = false; |
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[819] | 399 | //std::cout << "G4QMDRESULT Collsion Blocked " << std::endl; |
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| 400 | } |
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[962] | 401 | */ |
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[819] | 402 | |
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| 403 | /* |
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| 404 | std::cout << "G4QMDRESULT Collsion initial p4 i and j " |
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| 405 | << p4i << " " << p4j |
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| 406 | << std::endl; |
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| 407 | */ |
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[962] | 408 | // 081118 |
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| 409 | //if ( energetically_forbidden == true || pauli_blocked == true ) |
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| 410 | if ( energetically_forbidden == true ) |
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[819] | 411 | { |
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| 412 | |
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[962] | 413 | //G4cout << " energetically_forbidden " << G4endl; |
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| 414 | // Collsion not allowed then re enter orginal participants |
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| 415 | // Now only momentum, becasuse we only consider elastic scattering of nucleons |
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| 416 | |
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[819] | 417 | theSystem->GetParticipant( i )->SetMomentum( p4i.vect() ); |
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| 418 | theSystem->GetParticipant( i )->SetDefinition( pdi ); |
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| 419 | theSystem->GetParticipant( i )->SetPosition( ri ); |
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[962] | 420 | |
---|
[819] | 421 | theSystem->GetParticipant( j )->SetMomentum( p4j.vect() ); |
---|
| 422 | theSystem->GetParticipant( j )->SetDefinition( pdj ); |
---|
| 423 | theSystem->GetParticipant( j )->SetPosition( rj ); |
---|
| 424 | |
---|
[962] | 425 | theMeanField->Cal2BodyQuantities( i ); |
---|
| 426 | theMeanField->Cal2BodyQuantities( j ); |
---|
| 427 | |
---|
[819] | 428 | } |
---|
| 429 | else |
---|
| 430 | { |
---|
| 431 | |
---|
[962] | 432 | |
---|
| 433 | G4bool absorption = false; |
---|
| 434 | if ( n == theSystem->GetTotalNumberOfParticipant()+1 ) absorption = true; |
---|
| 435 | if ( absorption ) |
---|
| 436 | { |
---|
| 437 | //G4cout << "Absorption happend " << G4endl; |
---|
| 438 | i = i-1; |
---|
| 439 | n = n-1; |
---|
| 440 | } |
---|
| 441 | |
---|
| 442 | // Collsion allowed (really happened) |
---|
| 443 | |
---|
[819] | 444 | // Unset Projectile/Target flag |
---|
| 445 | theSystem->GetParticipant( i )->UnsetInitialMark(); |
---|
[962] | 446 | if ( !absorption ) theSystem->GetParticipant( j )->UnsetInitialMark(); |
---|
[819] | 447 | |
---|
[962] | 448 | theSystem->GetParticipant( i )->SetHitMark(); |
---|
| 449 | if ( !absorption ) theSystem->GetParticipant( j )->SetHitMark(); |
---|
[819] | 450 | |
---|
| 451 | theSystem->IncrementCollisionCounter(); |
---|
| 452 | |
---|
| 453 | /* |
---|
| 454 | std::cout << "G4QMDRESULT Collsion Really Happened between " |
---|
| 455 | << i << " and " << j |
---|
| 456 | << std::endl; |
---|
| 457 | std::cout << "G4QMDRESULT Collsion initial p4 i and j " |
---|
| 458 | << p4i << " " << p4j |
---|
| 459 | << std::endl; |
---|
| 460 | std::cout << "G4QMDRESULT Collsion after p4 i and j " |
---|
| 461 | << theSystem->GetParticipant( i )->Get4Momentum() |
---|
| 462 | << " " |
---|
| 463 | << theSystem->GetParticipant( j )->Get4Momentum() |
---|
| 464 | << std::endl; |
---|
| 465 | std::cout << "G4QMDRESULT Collsion Diff " |
---|
| 466 | << p4i + p4j - theSystem->GetParticipant( i )->Get4Momentum() - theSystem->GetParticipant( j )->Get4Momentum() |
---|
| 467 | << std::endl; |
---|
| 468 | std::cout << "G4QMDRESULT Collsion initial r i and j " |
---|
| 469 | << ri << " " << rj |
---|
| 470 | << std::endl; |
---|
| 471 | std::cout << "G4QMDRESULT Collsion after r i and j " |
---|
| 472 | << theSystem->GetParticipant( i )->GetPosition() |
---|
| 473 | << " " |
---|
| 474 | << theSystem->GetParticipant( j )->GetPosition() |
---|
| 475 | << std::endl; |
---|
| 476 | */ |
---|
[962] | 477 | |
---|
[819] | 478 | |
---|
| 479 | } |
---|
| 480 | |
---|
| 481 | } |
---|
| 482 | |
---|
| 483 | } |
---|
| 484 | |
---|
[962] | 485 | |
---|
[819] | 486 | } |
---|
| 487 | |
---|
| 488 | |
---|
| 489 | |
---|
| 490 | G4bool G4QMDCollision::CalFinalStateOfTheBinaryCollision( G4int i , G4int j ) |
---|
| 491 | { |
---|
| 492 | |
---|
[962] | 493 | //081103 |
---|
| 494 | //G4cout << "CalFinalStateOfTheBinaryCollision " << i << " " << j << " " << theSystem->GetTotalNumberOfParticipant() << G4endl; |
---|
[819] | 495 | |
---|
[962] | 496 | G4bool result = false; |
---|
| 497 | G4bool energyOK = false; |
---|
| 498 | G4bool pauliOK = false; |
---|
| 499 | G4bool abs = false; |
---|
| 500 | G4QMDParticipant* absorbed = NULL; |
---|
[819] | 501 | |
---|
[962] | 502 | G4LorentzVector p4i = theSystem->GetParticipant( i )->Get4Momentum(); |
---|
| 503 | G4LorentzVector p4j = theSystem->GetParticipant( j )->Get4Momentum(); |
---|
[819] | 504 | |
---|
| 505 | //071031 |
---|
| 506 | |
---|
| 507 | G4double epot = theMeanField->GetTotalPotential(); |
---|
| 508 | |
---|
| 509 | G4double eini = epot + p4i.e() + p4j.e(); |
---|
| 510 | |
---|
| 511 | //071031 |
---|
[962] | 512 | // will use KineticTrack |
---|
[819] | 513 | G4ParticleDefinition* pdi0 =theSystem->GetParticipant( i )->GetDefinition(); |
---|
| 514 | G4ParticleDefinition* pdj0 =theSystem->GetParticipant( j )->GetDefinition(); |
---|
[962] | 515 | G4LorentzVector p4i0 = p4i*GeV; |
---|
| 516 | G4LorentzVector p4j0 = p4j*GeV; |
---|
| 517 | G4ThreeVector ri0 = ( theSystem->GetParticipant( i )->GetPosition() )*fermi; |
---|
| 518 | G4ThreeVector rj0 = ( theSystem->GetParticipant( j )->GetPosition() )*fermi; |
---|
[819] | 519 | |
---|
| 520 | for ( G4int iitry = 0 ; iitry < 4 ; iitry++ ) |
---|
| 521 | { |
---|
| 522 | |
---|
[962] | 523 | abs = false; |
---|
| 524 | |
---|
| 525 | G4KineticTrack kt1( pdi0 , 0.0 , ri0 , p4i0 ); |
---|
| 526 | G4KineticTrack kt2( pdj0 , 0.0 , rj0 , p4j0 ); |
---|
| 527 | |
---|
[819] | 528 | G4LorentzVector p4ix_new; |
---|
| 529 | G4LorentzVector p4jx_new; |
---|
| 530 | G4KineticTrackVector* secs = NULL; |
---|
| 531 | secs = theScatterer->Scatter( kt1 , kt2 ); |
---|
| 532 | |
---|
| 533 | //std::cout << "G4QMDSCATTERER BEFORE " << kt1.GetDefinition()->GetParticleName() << " " << kt1.Get4Momentum()/GeV << " " << kt1.GetPosition()/fermi << std::endl; |
---|
| 534 | //std::cout << "G4QMDSCATTERER BEFORE " << kt2.GetDefinition()->GetParticleName() << " " << kt2.Get4Momentum()/GeV << " " << kt2.GetPosition()/fermi << std::endl; |
---|
| 535 | //std::cout << "THESCATTERER " << theScatterer->GetCrossSection ( kt1 , kt2 )/millibarn << " " << elastic << " " << sig << std::endl; |
---|
[962] | 536 | |
---|
| 537 | |
---|
[819] | 538 | if ( secs ) |
---|
| 539 | { |
---|
| 540 | G4int iti = 0; |
---|
| 541 | if ( secs->size() == 2 ) |
---|
| 542 | { |
---|
| 543 | for ( G4KineticTrackVector::iterator it |
---|
| 544 | = secs->begin() ; it != secs->end() ; it++ ) |
---|
| 545 | { |
---|
| 546 | if ( iti == 0 ) |
---|
| 547 | { |
---|
| 548 | theSystem->GetParticipant( i )->SetDefinition( (*it)->GetDefinition() ); |
---|
| 549 | p4ix_new = (*it)->Get4Momentum()/GeV; |
---|
| 550 | //std::cout << "THESCATTERER " << (*it)->GetDefinition()->GetParticleName() << std::endl; |
---|
| 551 | theSystem->GetParticipant( i )->SetMomentum( p4ix_new.v() ); |
---|
| 552 | } |
---|
| 553 | if ( iti == 1 ) |
---|
| 554 | { |
---|
| 555 | theSystem->GetParticipant( j )->SetDefinition( (*it)->GetDefinition() ); |
---|
| 556 | p4jx_new = (*it)->Get4Momentum()/GeV; |
---|
| 557 | //std::cout << "THESCATTERER " << p4jx_new.e()-p4jx_new.m() << std::endl; |
---|
| 558 | theSystem->GetParticipant( j )->SetMomentum( p4jx_new.v() ); |
---|
| 559 | } |
---|
| 560 | //std::cout << "G4QMDSCATTERER AFTER " << (*it)->GetDefinition()->GetParticleName() << " " << (*it)->Get4Momentum()/GeV << std::endl; |
---|
| 561 | iti++; |
---|
| 562 | } |
---|
| 563 | } |
---|
[962] | 564 | else if ( secs->size() == 1 ) |
---|
[819] | 565 | { |
---|
[962] | 566 | //081118 |
---|
| 567 | abs = true; |
---|
| 568 | //G4cout << "G4QMDCollision pion absrorption " << secs->front()->GetDefinition()->GetParticleName() << G4endl; |
---|
[819] | 569 | //secs->front()->Decay(); |
---|
| 570 | theSystem->GetParticipant( i )->SetDefinition( secs->front()->GetDefinition() ); |
---|
| 571 | p4ix_new = secs->front()->Get4Momentum()/GeV; |
---|
| 572 | theSystem->GetParticipant( i )->SetMomentum( p4ix_new.v() ); |
---|
| 573 | |
---|
| 574 | } |
---|
| 575 | |
---|
[962] | 576 | //081118 |
---|
| 577 | if ( secs->size() > 2 ) |
---|
| 578 | { |
---|
[819] | 579 | |
---|
[962] | 580 | G4cout << "G4QMDCollision secs size > 2; " << secs->size() << G4endl; |
---|
| 581 | |
---|
| 582 | for ( G4KineticTrackVector::iterator it |
---|
| 583 | = secs->begin() ; it != secs->end() ; it++ ) |
---|
| 584 | { |
---|
| 585 | G4cout << "G4QMDSCATTERER AFTER " << (*it)->GetDefinition()->GetParticleName() << " " << (*it)->Get4Momentum()/GeV << G4endl; |
---|
| 586 | } |
---|
| 587 | |
---|
| 588 | } |
---|
| 589 | |
---|
[819] | 590 | // deleteing KineticTrack |
---|
| 591 | for ( G4KineticTrackVector::iterator it |
---|
| 592 | = secs->begin() ; it != secs->end() ; it++ ) |
---|
| 593 | { |
---|
| 594 | delete *it; |
---|
| 595 | } |
---|
[962] | 596 | |
---|
| 597 | delete secs; |
---|
[819] | 598 | } |
---|
| 599 | //071031 |
---|
| 600 | |
---|
[962] | 601 | if ( !abs ) |
---|
| 602 | { |
---|
| 603 | theMeanField->Cal2BodyQuantities( i ); |
---|
| 604 | theMeanField->Cal2BodyQuantities( j ); |
---|
| 605 | } |
---|
| 606 | else |
---|
| 607 | { |
---|
| 608 | absorbed = theSystem->EraseParticipant( j ); |
---|
| 609 | theMeanField->Update(); |
---|
| 610 | } |
---|
[819] | 611 | |
---|
| 612 | epot = theMeanField->GetTotalPotential(); |
---|
| 613 | |
---|
| 614 | G4double efin = epot + p4ix_new.e() + p4jx_new.e(); |
---|
| 615 | |
---|
| 616 | //std::cout << "Collision NEW epot " << i << " " << j << " " << epot << " " << std::abs ( eini - efin ) - epse << std::endl; |
---|
| 617 | |
---|
| 618 | /* |
---|
| 619 | std::cout << "Collision efin " << i << " " << j << " " << efin << std::endl; |
---|
| 620 | std::cout << "Collision " << i << " " << j << " " << std::abs ( eini - efin ) << " " << epse << std::endl; |
---|
| 621 | std::cout << "Collision " << std::abs ( eini - efin ) << " " << epse << std::endl; |
---|
| 622 | */ |
---|
| 623 | |
---|
| 624 | //071031 |
---|
| 625 | if ( std::abs ( eini - efin ) < epse ) |
---|
| 626 | { |
---|
| 627 | // Collison OK |
---|
| 628 | //std::cout << "collisions6" << std::endl; |
---|
| 629 | //std::cout << "collisions before " << p4i << " " << p4j << std::endl; |
---|
| 630 | //std::cout << "collisions after " << theSystem->GetParticipant( i )->Get4Momentum() << " " << theSystem->GetParticipant( j )->Get4Momentum() << std::endl; |
---|
| 631 | //std::cout << "collisions dif " << ( p4i + p4j ) - ( theSystem->GetParticipant( i )->Get4Momentum() + theSystem->GetParticipant( j )->Get4Momentum() ) << std::endl; |
---|
[962] | 632 | //std::cout << "collisions before " << ri0/fermi << " " << rj0/fermi << std::endl; |
---|
[819] | 633 | //std::cout << "collisions after " << theSystem->GetParticipant( i )->GetPosition() << " " << theSystem->GetParticipant( j )->GetPosition() << std::endl; |
---|
[962] | 634 | energyOK = true; |
---|
| 635 | break; |
---|
[819] | 636 | } |
---|
[962] | 637 | else |
---|
| 638 | { |
---|
| 639 | //G4cout << "Energy Not OK " << G4endl; |
---|
| 640 | if ( abs ) |
---|
| 641 | { |
---|
| 642 | //G4cout << "TKDB reinsert j " << G4endl; |
---|
| 643 | theSystem->InsertParticipant( absorbed , j ); |
---|
| 644 | theMeanField->Update(); |
---|
| 645 | } |
---|
| 646 | // do not need reinsert in no absroption case |
---|
| 647 | } |
---|
[819] | 648 | //071031 |
---|
[962] | 649 | } |
---|
[819] | 650 | |
---|
[962] | 651 | // Energetically forbidden collision |
---|
[819] | 652 | |
---|
[962] | 653 | if ( energyOK ) |
---|
| 654 | { |
---|
| 655 | // Pauli Check |
---|
| 656 | //G4cout << "Pauli Checking " << theSystem->GetTotalNumberOfParticipant() << G4endl; |
---|
| 657 | if ( !abs ) |
---|
| 658 | { |
---|
| 659 | if ( !( theMeanField->IsPauliBlocked ( i ) == true || theMeanField->IsPauliBlocked ( j ) == true ) ) |
---|
| 660 | { |
---|
| 661 | //G4cout << "Binary Collision Happen " << theSystem->GetTotalNumberOfParticipant() << G4endl; |
---|
| 662 | pauliOK = true; |
---|
| 663 | } |
---|
| 664 | } |
---|
| 665 | else |
---|
| 666 | { |
---|
[1055] | 667 | //if ( theMeanField->IsPauliBlocked ( i ) == false ) |
---|
| 668 | //090126 i-1 cause jth is erased |
---|
| 669 | if ( theMeanField->IsPauliBlocked ( i-1 ) == false ) |
---|
[962] | 670 | { |
---|
| 671 | //G4cout << "Absorption Happen " << theSystem->GetTotalNumberOfParticipant() << G4endl; |
---|
| 672 | delete absorbed; |
---|
| 673 | pauliOK = true; |
---|
| 674 | } |
---|
| 675 | } |
---|
| 676 | |
---|
| 677 | |
---|
| 678 | if ( pauliOK ) |
---|
| 679 | { |
---|
| 680 | result = true; |
---|
| 681 | } |
---|
| 682 | else |
---|
| 683 | { |
---|
| 684 | //G4cout << "Pauli Blocked" << G4endl; |
---|
| 685 | if ( abs ) |
---|
| 686 | { |
---|
| 687 | //G4cout << "TKDB reinsert j pauli block" << G4endl; |
---|
| 688 | theSystem->InsertParticipant( absorbed , j ); |
---|
| 689 | theMeanField->Update(); |
---|
| 690 | } |
---|
| 691 | } |
---|
[819] | 692 | } |
---|
| 693 | |
---|
[962] | 694 | return result; |
---|
[819] | 695 | |
---|
| 696 | } |
---|
| 697 | |
---|
| 698 | |
---|
| 699 | |
---|
| 700 | G4bool G4QMDCollision::CalFinalStateOfTheBinaryCollisionJQMD( G4double sig , G4double cutoff , G4ThreeVector pcm , G4double prcm , G4double srt , G4ThreeVector beta , G4double gamma , G4int i , G4int j ) |
---|
| 701 | { |
---|
| 702 | |
---|
| 703 | //G4cout << "CalFinalStateOfTheBinaryCollisionJQMD" << G4endl; |
---|
| 704 | |
---|
| 705 | G4bool result = true; |
---|
| 706 | |
---|
| 707 | G4LorentzVector p4i = theSystem->GetParticipant( i )->Get4Momentum(); |
---|
| 708 | G4double rmi = theSystem->GetParticipant( i )->GetMass(); |
---|
| 709 | G4int zi = theSystem->GetParticipant( i )->GetChargeInUnitOfEplus(); |
---|
| 710 | |
---|
| 711 | G4LorentzVector p4j = theSystem->GetParticipant( j )->Get4Momentum(); |
---|
| 712 | G4double rmj = theSystem->GetParticipant( j )->GetMass(); |
---|
| 713 | G4int zj = theSystem->GetParticipant( j )->GetChargeInUnitOfEplus(); |
---|
| 714 | |
---|
| 715 | G4double pr = prcm; |
---|
| 716 | |
---|
| 717 | G4double c2 = pcm.z()/pr; |
---|
| 718 | |
---|
| 719 | G4double csrt = srt - cutoff; |
---|
| 720 | |
---|
| 721 | //G4double pri = prcm; |
---|
| 722 | //G4double prf = sqrt ( 0.25 * srt*srt -rm2 ); |
---|
| 723 | |
---|
| 724 | G4double asrt = srt - rmi - rmj; |
---|
| 725 | G4double pra = prcm; |
---|
| 726 | |
---|
| 727 | |
---|
| 728 | |
---|
| 729 | G4double elastic = 0.0; |
---|
| 730 | |
---|
| 731 | if ( zi == zj ) |
---|
| 732 | { |
---|
| 733 | if ( csrt < 0.4286 ) |
---|
| 734 | { |
---|
| 735 | elastic = 35.0 / ( 1. + csrt * 100.0 ) + 20.0; |
---|
| 736 | } |
---|
| 737 | else |
---|
| 738 | { |
---|
| 739 | elastic = ( - std::atan( ( csrt - 0.4286 ) * 1.5 - 0.8 ) |
---|
| 740 | * 2. / pi + 1.0 ) * 9.65 + 7.0; |
---|
| 741 | } |
---|
| 742 | } |
---|
| 743 | else |
---|
| 744 | { |
---|
| 745 | if ( csrt < 0.4286 ) |
---|
| 746 | { |
---|
| 747 | elastic = 28.0 / ( 1. + csrt * 100.0 ) + 27.0; |
---|
| 748 | } |
---|
| 749 | else |
---|
| 750 | { |
---|
| 751 | elastic = ( - std::atan( ( csrt - 0.4286 ) * 1.5 - 0.8 ) |
---|
| 752 | * 2. / pi + 1.0 ) * 12.34 + 10.0; |
---|
| 753 | } |
---|
| 754 | } |
---|
| 755 | |
---|
| 756 | // std::cout << "Collision csrt " << i << " " << j << " " << csrt << std::endl; |
---|
| 757 | // std::cout << "Collision elstic " << i << " " << j << " " << elastic << std::endl; |
---|
| 758 | |
---|
| 759 | |
---|
| 760 | // std::cout << "Collision sig " << i << " " << j << " " << sig << std::endl; |
---|
| 761 | if ( G4UniformRand() > elastic / sig ) |
---|
| 762 | { |
---|
| 763 | //std::cout << "Inelastic " << std::endl; |
---|
| 764 | //std::cout << "elastic/sig " << elastic/sig << std::endl; |
---|
| 765 | return result; |
---|
| 766 | } |
---|
| 767 | else |
---|
| 768 | { |
---|
| 769 | //std::cout << "Elastic " << std::endl; |
---|
| 770 | } |
---|
| 771 | // std::cout << "Collision ELSTIC " << i << " " << j << std::endl; |
---|
| 772 | |
---|
| 773 | |
---|
| 774 | G4double as = std::pow ( 3.65 * asrt , 6 ); |
---|
| 775 | G4double a = 6.0 * as / (1.0 + as); |
---|
| 776 | G4double ta = -2.0 * pra*pra; |
---|
| 777 | G4double x = G4UniformRand(); |
---|
| 778 | G4double t1 = std::log( (1-x) * std::exp(2.*a*ta) + x ) / a; |
---|
| 779 | G4double c1 = 1.0 - t1/ta; |
---|
| 780 | |
---|
| 781 | if( std::abs(c1) > 1.0 ) c1 = 2.0 * x - 1.0; |
---|
| 782 | |
---|
| 783 | /* |
---|
| 784 | std::cout << "Collision as " << i << " " << j << " " << as << std::endl; |
---|
| 785 | std::cout << "Collision a " << i << " " << j << " " << a << std::endl; |
---|
| 786 | std::cout << "Collision ta " << i << " " << j << " " << ta << std::endl; |
---|
| 787 | std::cout << "Collision x " << i << " " << j << " " << x << std::endl; |
---|
| 788 | std::cout << "Collision t1 " << i << " " << j << " " << t1 << std::endl; |
---|
| 789 | std::cout << "Collision c1 " << i << " " << j << " " << c1 << std::endl; |
---|
| 790 | */ |
---|
| 791 | t1 = 2.0*pi*G4UniformRand(); |
---|
| 792 | // std::cout << "Collision t1 " << i << " " << j << " " << t1 << std::endl; |
---|
| 793 | G4double t2 = 0.0; |
---|
| 794 | if ( pcm.x() == 0.0 && pcm.y() == 0 ) |
---|
| 795 | { |
---|
| 796 | t2 = 0.0; |
---|
| 797 | } |
---|
| 798 | else |
---|
| 799 | { |
---|
| 800 | t2 = std::atan2( pcm.y() , pcm.x() ); |
---|
| 801 | } |
---|
| 802 | // std::cout << "Collision t2 " << i << " " << j << " " << t2 << std::endl; |
---|
| 803 | |
---|
| 804 | G4double s1 = std::sqrt ( 1.0 - c1*c1 ); |
---|
| 805 | G4double s2 = std::sqrt ( 1.0 - c2*c2 ); |
---|
| 806 | |
---|
| 807 | G4double ct1 = std::cos(t1); |
---|
| 808 | G4double st1 = std::sin(t1); |
---|
| 809 | |
---|
| 810 | G4double ct2 = std::cos(t2); |
---|
| 811 | G4double st2 = std::sin(t2); |
---|
| 812 | |
---|
| 813 | G4double ss = c2*s1*ct1 + s2*c1; |
---|
| 814 | |
---|
| 815 | pcm.setX( pr * ( ss*ct2 - s1*st1*st2) ); |
---|
| 816 | pcm.setY( pr * ( ss*st2 + s1*st1*ct2) ); |
---|
| 817 | pcm.setZ( pr * ( c1*c2 - s1*s2*ct1) ); |
---|
| 818 | |
---|
| 819 | // std::cout << "Collision pcm " << i << " " << j << " " << pcm << std::endl; |
---|
| 820 | |
---|
| 821 | G4double epot = theMeanField->GetTotalPotential(); |
---|
| 822 | |
---|
| 823 | G4double eini = epot + p4i.e() + p4j.e(); |
---|
| 824 | G4double etwo = p4i.e() + p4j.e(); |
---|
| 825 | |
---|
| 826 | /* |
---|
| 827 | std::cout << "Collision epot " << i << " " << j << " " << epot << std::endl; |
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| 828 | std::cout << "Collision eini " << i << " " << j << " " << eini << std::endl; |
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| 829 | std::cout << "Collision etwo " << i << " " << j << " " << etwo << std::endl; |
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| 830 | */ |
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| 831 | |
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| 832 | |
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| 833 | for ( G4int itry = 0 ; itry < 4 ; itry++ ) |
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| 834 | { |
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| 835 | |
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| 836 | G4double eicm = std::sqrt ( rmi*rmi + pcm*pcm ); |
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| 837 | G4double pibeta = pcm*beta; |
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| 838 | |
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| 839 | G4double trans = gamma * ( gamma * pibeta / ( gamma + 1 ) + eicm ); |
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| 840 | |
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| 841 | G4ThreeVector pi_new = beta*trans + pcm; |
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| 842 | |
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| 843 | G4double ejcm = std::sqrt ( rmj*rmj + pcm*pcm ); |
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| 844 | trans = gamma * ( gamma * pibeta / ( gamma + 1 ) + ejcm ); |
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| 845 | |
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| 846 | G4ThreeVector pj_new = beta*trans - pcm; |
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| 847 | |
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| 848 | // |
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| 849 | // Delete old |
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| 850 | // Add new Particitipants |
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| 851 | // |
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| 852 | // Now only change momentum ( Beacuse we only have elastic sctter of nucleon |
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| 853 | // In future Definition also will be change |
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| 854 | // |
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| 855 | |
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| 856 | theSystem->GetParticipant( i )->SetMomentum( pi_new ); |
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| 857 | theSystem->GetParticipant( j )->SetMomentum( pj_new ); |
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| 858 | |
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| 859 | G4double pi_new_e = (theSystem->GetParticipant( i )->Get4Momentum()).e(); |
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| 860 | G4double pj_new_e = (theSystem->GetParticipant( j )->Get4Momentum()).e(); |
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| 861 | |
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| 862 | theMeanField->Cal2BodyQuantities( i ); |
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| 863 | theMeanField->Cal2BodyQuantities( j ); |
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| 864 | |
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| 865 | epot = theMeanField->GetTotalPotential(); |
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| 866 | |
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| 867 | G4double efin = epot + pi_new_e + pj_new_e ; |
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| 868 | |
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| 869 | //std::cout << "Collision NEW epot " << i << " " << j << " " << epot << " " << std::abs ( eini - efin ) - epse << std::endl; |
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| 870 | /* |
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| 871 | std::cout << "Collision efin " << i << " " << j << " " << efin << std::endl; |
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| 872 | std::cout << "Collision " << i << " " << j << " " << std::abs ( eini - efin ) << " " << epse << std::endl; |
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| 873 | std::cout << "Collision " << std::abs ( eini - efin ) << " " << epse << std::endl; |
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| 874 | */ |
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| 875 | |
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| 876 | //071031 |
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| 877 | if ( std::abs ( eini - efin ) < epse ) |
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| 878 | { |
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| 879 | // Collison OK |
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| 880 | //std::cout << "collisions6" << std::endl; |
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| 881 | //std::cout << "collisions before " << p4i << " " << p4j << std::endl; |
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| 882 | //std::cout << "collisions after " << theSystem->GetParticipant( i )->Get4Momentum() << " " << theSystem->GetParticipant( j )->Get4Momentum() << std::endl; |
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| 883 | //std::cout << "collisions dif " << ( p4i + p4j ) - ( theSystem->GetParticipant( i )->Get4Momentum() + theSystem->GetParticipant( j )->Get4Momentum() ) << std::endl; |
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| 884 | //std::cout << "collisions before " << rix/fermi << " " << rjx/fermi << std::endl; |
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| 885 | //std::cout << "collisions after " << theSystem->GetParticipant( i )->GetPosition() << " " << theSystem->GetParticipant( j )->GetPosition() << std::endl; |
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| 886 | } |
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| 887 | //071031 |
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| 888 | |
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| 889 | if ( std::abs ( eini - efin ) < epse ) return result; // Collison OK |
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| 890 | |
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| 891 | G4double cona = ( eini - efin + etwo ) / gamma; |
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| 892 | G4double fac2 = 1.0 / ( 4.0 * cona*cona * pr*pr ) * |
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| 893 | ( ( cona*cona - ( rmi*rmi + rmj*rmj ) )*( cona*cona - ( rmi*rmi + rmj*rmj ) ) |
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| 894 | - 4.0 * rmi*rmi * rmj*rmj ); |
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| 895 | |
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| 896 | if ( fac2 > 0 ) |
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| 897 | { |
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| 898 | G4double fact = std::sqrt ( fac2 ); |
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| 899 | pcm = fact*pcm; |
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| 900 | } |
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| 901 | |
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| 902 | |
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| 903 | } |
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| 904 | |
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| 905 | // Energetically forbidden collision |
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| 906 | result = false; |
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| 907 | |
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| 908 | return result; |
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| 909 | |
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| 910 | } |
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