[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // Author: Christian V"olcker (Christian.Volcker@cern.ch), |
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| 27 | // |
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| 28 | // Creation date: November 1997 |
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| 29 | // |
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| 30 | // Testfile: ../G4KaonMinusAbsorptionAtRestTest.cc |
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| 31 | // |
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| 32 | // Modifications: |
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| 33 | // Maria Grazia Pia September 1998 |
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| 34 | // Various bug fixes, eliminated several memory leaks |
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| 35 | // |
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| 36 | // ------------------------------------------------------------------- |
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| 37 | |
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| 38 | |
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| 39 | #include "G4KaonMinusAbsorptionAtRest.hh" |
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| 40 | |
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| 41 | #include "G4StopDeexcitation.hh" |
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| 42 | #include "G4StopTheoDeexcitation.hh" |
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| 43 | #include "G4StopDeexcitationAlgorithm.hh" |
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| 44 | #include "G4ReactionKinematics.hh" |
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[1055] | 45 | #include "G4HadronicProcessStore.hh" |
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[819] | 46 | |
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| 47 | G4KaonMinusAbsorptionAtRest::G4KaonMinusAbsorptionAtRest(const G4String& processName, |
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| 48 | G4ProcessType aType ) : |
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| 49 | G4VRestProcess (processName, aType) |
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| 50 | { |
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| 51 | if (verboseLevel>0) { |
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| 52 | G4cout << GetProcessName() << " is created "<< G4endl; |
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| 53 | } |
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[962] | 54 | SetProcessSubType(fHadronAtRest); |
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[819] | 55 | |
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| 56 | // see Cohn et al, PLB27(1968) 527; |
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| 57 | // Davis et al, PLB1(1967) 434; |
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| 58 | |
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| 59 | pionAbsorptionRate = 0.07; |
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| 60 | |
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| 61 | // see VanderVelde-Wilquet et al, Nuov.Cim.39A(1978)538; |
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| 62 | // see VanderVelde-Wilquet et al, Nuov.Cim.38A(1977)178; |
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| 63 | // see VanderVelde-Wilquet et al, Nucl.Phys.A241(1975)511; |
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| 64 | // primary production rates ( for absorption on Carbon) |
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| 65 | // .. other elements are extrapolated by the halo factor. |
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| 66 | |
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| 67 | rateLambdaZeroPiZero = 0.052; |
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| 68 | rateSigmaMinusPiPlus = 0.199; |
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| 69 | rateSigmaPlusPiMinus = 0.446; |
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| 70 | rateSigmaZeroPiZero = 0.303; |
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| 71 | rateLambdaZeroPiMinus = 0.568; |
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| 72 | rateSigmaZeroPiMinus = 0.216; |
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| 73 | rateSigmaMinusPiZero = 0.216; |
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| 74 | |
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| 75 | // for sigma- p -> lambda n |
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| 76 | // sigma+ n -> lambda p |
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| 77 | // sigma- n -> lambda |
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| 78 | // all values compatible with 0.55 same literature as above. |
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| 79 | |
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| 80 | sigmaPlusLambdaConversionRate = 0.55; |
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| 81 | sigmaMinusLambdaConversionRate = 0.55; |
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| 82 | sigmaZeroLambdaConversionRate = 0.55; |
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[1055] | 83 | |
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| 84 | G4HadronicProcessStore::Instance()->RegisterExtraProcess(this); |
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[819] | 85 | } |
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| 86 | |
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| 87 | |
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| 88 | G4KaonMinusAbsorptionAtRest::~G4KaonMinusAbsorptionAtRest() |
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[1055] | 89 | { |
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| 90 | G4HadronicProcessStore::Instance()->DeRegisterExtraProcess(this); |
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| 91 | } |
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[819] | 92 | |
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[1055] | 93 | void G4KaonMinusAbsorptionAtRest::PreparePhysicsTable(const G4ParticleDefinition& p) |
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| 94 | { |
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| 95 | G4HadronicProcessStore::Instance()->RegisterParticleForExtraProcess(this, &p); |
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| 96 | } |
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[819] | 97 | |
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[1055] | 98 | void G4KaonMinusAbsorptionAtRest::BuildPhysicsTable(const G4ParticleDefinition& p) |
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| 99 | { |
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| 100 | G4HadronicProcessStore::Instance()->PrintInfo(&p); |
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| 101 | } |
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| 102 | |
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[819] | 103 | G4VParticleChange* G4KaonMinusAbsorptionAtRest::AtRestDoIt |
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| 104 | (const G4Track& track, const G4Step& ) |
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| 105 | { |
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| 106 | stoppedHadron = track.GetDynamicParticle(); |
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| 107 | |
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| 108 | // Check applicability |
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| 109 | |
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| 110 | if (!IsApplicable(*(stoppedHadron->GetDefinition()))) |
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| 111 | { |
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| 112 | G4cerr <<"G4KaonMinusAbsorptionAtRest:ERROR, particle must be a Kaon!" <<G4endl; |
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| 113 | return 0; |
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| 114 | } |
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| 115 | |
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| 116 | G4Material* material; |
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| 117 | material = track.GetMaterial(); |
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| 118 | nucleus = 0; |
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| 119 | do |
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| 120 | { |
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| 121 | // Select the nucleus, get nucleon |
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| 122 | nucleus = new G4Nucleus(material); |
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| 123 | if (nucleus->GetN() < 1.5) |
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| 124 | { |
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| 125 | delete nucleus; |
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| 126 | nucleus = 0; |
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| 127 | } |
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| 128 | } while(nucleus == 0); |
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| 129 | |
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| 130 | G4double Z = nucleus->GetZ(); |
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| 131 | G4double A = nucleus->GetN(); |
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| 132 | |
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| 133 | // Do the interaction with the nucleon |
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| 134 | G4DynamicParticleVector* absorptionProducts = KaonNucleonReaction(); |
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| 135 | |
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| 136 | // Secondary interactions |
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| 137 | |
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| 138 | G4DynamicParticle* thePion; |
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| 139 | unsigned int i; |
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| 140 | for(i = 0; i < absorptionProducts->size(); i++) |
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| 141 | { |
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| 142 | thePion = (*absorptionProducts)[i]; |
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| 143 | if (thePion->GetDefinition() == G4PionMinus::PionMinus() |
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| 144 | || thePion->GetDefinition() == G4PionPlus::PionPlus() |
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| 145 | || thePion->GetDefinition() == G4PionZero::PionZero()) |
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| 146 | { |
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| 147 | if (AbsorbPionByNucleus(thePion)) |
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| 148 | { |
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| 149 | absorptionProducts->erase(absorptionProducts->begin()+i); |
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| 150 | i--; |
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| 151 | delete thePion; |
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| 152 | if (verboseLevel > 1) |
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| 153 | G4cout << "G4KaonMinusAbsorption::AtRestDoIt: Pion absorbed in Nucleus" |
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| 154 | << G4endl; |
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| 155 | } |
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| 156 | } |
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| 157 | } |
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| 158 | |
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| 159 | G4DynamicParticle* theSigma; |
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| 160 | G4DynamicParticle* theLambda; |
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| 161 | for (i = 0; i < absorptionProducts->size(); i++) |
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| 162 | { |
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| 163 | theSigma = (*absorptionProducts)[i]; |
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| 164 | if (theSigma->GetDefinition() == G4SigmaMinus::SigmaMinus() |
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| 165 | || theSigma->GetDefinition() == G4SigmaPlus::SigmaPlus() |
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| 166 | || theSigma->GetDefinition() == G4SigmaZero::SigmaZero()) |
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| 167 | { |
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| 168 | theLambda = SigmaLambdaConversion(theSigma); |
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| 169 | if (theLambda != 0){ |
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| 170 | absorptionProducts->erase(absorptionProducts->begin()+i); |
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| 171 | i--; |
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| 172 | delete theSigma; |
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| 173 | absorptionProducts->push_back(theLambda); |
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| 174 | |
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| 175 | if (verboseLevel > 1) |
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| 176 | G4cout << "G4KaonMinusAbsorption::AtRestDoIt: SigmaLambdaConversion Done" |
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| 177 | << G4endl; |
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| 178 | } |
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| 179 | } |
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| 180 | } |
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| 181 | |
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| 182 | // Nucleus deexcitation |
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| 183 | |
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| 184 | G4double productEnergy = 0.; |
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| 185 | G4ThreeVector pProducts(0.,0.,0.); |
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| 186 | |
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| 187 | unsigned int nAbsorptionProducts = 0; |
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| 188 | if (absorptionProducts != 0) nAbsorptionProducts = absorptionProducts->size(); |
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| 189 | |
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| 190 | for ( i = 0; i<nAbsorptionProducts; i++) |
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| 191 | { |
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| 192 | pProducts = pProducts + (*absorptionProducts)[i]->GetMomentum(); |
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| 193 | productEnergy += (*absorptionProducts)[i]->GetKineticEnergy(); |
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| 194 | } |
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| 195 | |
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| 196 | G4double newZ = nucleus->GetZ(); |
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| 197 | G4double newA = nucleus->GetN(); |
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| 198 | |
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[962] | 199 | G4double bDiff = G4NucleiProperties::GetBindingEnergy(static_cast<G4int>(A),static_cast<G4int>(Z)) - |
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| 200 | G4NucleiProperties::GetBindingEnergy(static_cast<G4int>(newA), static_cast<G4int>(newZ)); |
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[819] | 201 | |
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| 202 | G4double pNucleus = pProducts.mag(); |
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| 203 | |
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| 204 | G4StopDeexcitationAlgorithm* nucleusAlgorithm = new G4StopTheoDeexcitation(); |
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| 205 | G4StopDeexcitation stopDeexcitation(nucleusAlgorithm); |
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| 206 | |
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| 207 | nucleus->AddExcitationEnergy(bDiff); |
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| 208 | |
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| 209 | // returns excitation energy for the moment .. |
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| 210 | G4double energyDeposit = nucleus->GetEnergyDeposit(); |
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| 211 | if (verboseLevel>0) |
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| 212 | { |
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| 213 | G4cout << " -- KaonAtRest -- excitation = " |
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| 214 | << energyDeposit |
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| 215 | << ", pNucleus = " |
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| 216 | << pNucleus |
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| 217 | << ", A: " |
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| 218 | << A |
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| 219 | << ", " |
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| 220 | << newA |
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| 221 | << ", Z: " |
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| 222 | << Z |
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| 223 | << ", " |
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| 224 | << newZ |
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| 225 | << G4endl; |
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| 226 | } |
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| 227 | |
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| 228 | if (energyDeposit < 0.) |
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| 229 | { |
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| 230 | G4Exception("G4KaonMinusAbsorptionAtRest", "007", FatalException, |
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| 231 | "AtRestDoIt -- excitation energy < 0"); |
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| 232 | } |
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| 233 | delete nucleus; |
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| 234 | |
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| 235 | G4ReactionProductVector* fragmentationProducts = stopDeexcitation.DoBreakUp(newA,newZ,energyDeposit,pNucleus); |
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| 236 | |
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| 237 | unsigned int nFragmentationProducts = 0; |
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| 238 | if (fragmentationProducts != 0) nFragmentationProducts = fragmentationProducts->size(); |
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| 239 | |
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| 240 | //Initialize ParticleChange |
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| 241 | aParticleChange.Initialize(track); |
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| 242 | aParticleChange.SetNumberOfSecondaries(G4int(nAbsorptionProducts+nFragmentationProducts) ); |
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| 243 | |
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| 244 | // update List of alive particles. put energy deposit at the right place ... |
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| 245 | for (i = 0; i < nAbsorptionProducts; i++) |
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| 246 | {aParticleChange.AddSecondary((*absorptionProducts)[i]); } |
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| 247 | if (absorptionProducts != 0) delete absorptionProducts; |
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| 248 | |
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| 249 | // for (i = 0; i < nFragmentationProducts; i++) |
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| 250 | // { aParticleChange.AddSecondary(fragmentationProducts->at(i)); } |
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| 251 | for(i=0; i<nFragmentationProducts; i++) |
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| 252 | { |
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| 253 | G4DynamicParticle * aNew = |
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| 254 | new G4DynamicParticle((*fragmentationProducts)[i]->GetDefinition(), |
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| 255 | (*fragmentationProducts)[i]->GetTotalEnergy(), |
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| 256 | (*fragmentationProducts)[i]->GetMomentum()); |
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| 257 | G4double newTime = aParticleChange.GetGlobalTime((*fragmentationProducts)[i]->GetFormationTime()); |
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| 258 | aParticleChange.AddSecondary(aNew, newTime); |
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| 259 | delete (*fragmentationProducts)[i]; |
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| 260 | } |
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| 261 | if (fragmentationProducts != 0) delete fragmentationProducts; |
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| 262 | |
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| 263 | // finally ... |
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| 264 | aParticleChange.ProposeTrackStatus(fStopAndKill); // Kill the incident Kaon |
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| 265 | return &aParticleChange; |
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| 266 | } |
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| 267 | |
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| 268 | |
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| 269 | G4DynamicParticle G4KaonMinusAbsorptionAtRest::GetAbsorbingNucleon() |
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| 270 | { |
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| 271 | G4DynamicParticle aNucleon; |
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| 272 | |
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| 273 | // Get nucleon definition, based on Z,N of current Nucleus |
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| 274 | aNucleon.SetDefinition(SelectAbsorbingNucleon()); |
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| 275 | |
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| 276 | // Fermi momentum distribution in three dimensions |
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| 277 | G4ThreeVector pFermi = nucleus->GetFermiMomentum(); |
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| 278 | aNucleon.SetMomentum(pFermi); |
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| 279 | |
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| 280 | return aNucleon; |
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| 281 | } |
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| 282 | |
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| 283 | G4ParticleDefinition* G4KaonMinusAbsorptionAtRest::SelectAbsorbingNucleon() |
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| 284 | { |
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| 285 | // (Ch. Voelcker) extended from ReturnTargetParticle(): |
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| 286 | // Choose a proton or a neutron as the absorbing particle, |
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| 287 | // taking weight into account! |
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| 288 | // Update nucleon's atomic numbers. |
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| 289 | |
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| 290 | G4ParticleDefinition* absorbingParticleDef; |
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| 291 | |
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| 292 | G4double ranflat = G4UniformRand(); |
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| 293 | |
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| 294 | G4double myZ = nucleus->GetZ(); // number of protons |
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| 295 | G4double myN = nucleus->GetN(); // number of nucleons (not neutrons!!) |
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| 296 | |
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| 297 | // See VanderVelde-Wilquet et al, Nuov.Cim.39A(1978)538; |
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| 298 | G4double carbonRatioNP = 0.18; // (Rn/Rp)c, see page 544 |
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| 299 | |
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| 300 | G4double neutronProtonRatio = NeutronHaloFactor(myZ,myN)*carbonRatioNP*(myN-myZ)/myZ; |
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| 301 | G4double protonProbability = 1./(1.+neutronProtonRatio); |
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| 302 | |
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| 303 | if ( ranflat < protonProbability ) |
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| 304 | { |
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| 305 | absorbingParticleDef = G4Proton::Proton(); |
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| 306 | myZ-= 1.; |
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| 307 | } |
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| 308 | else |
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| 309 | { absorbingParticleDef = G4Neutron::Neutron(); } |
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| 310 | |
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| 311 | myN -= 1.; |
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| 312 | nucleus->SetParameters(myN,myZ); |
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| 313 | return absorbingParticleDef; |
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| 314 | } |
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| 315 | |
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| 316 | |
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| 317 | G4double G4KaonMinusAbsorptionAtRest::NeutronHaloFactor(G4double Z, G4double N) |
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| 318 | { |
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| 319 | // this function should take care of the probability for absorption |
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| 320 | // on neutrons, depending on number of protons Z and number of neutrons N-Z |
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| 321 | // parametrisation from fit to |
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| 322 | // VanderVelde-Wilquet et al, Nuov.Cim.39A(1978)538; |
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| 323 | // |
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| 324 | |
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| 325 | if (Z == 1.) return 1.389; // deuterium |
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| 326 | else if (Z == 2.) return 1.78; // helium |
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| 327 | else if (Z == 10.) return 0.66; // neon |
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| 328 | else |
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| 329 | return 0.6742+(N-Z)*0.06524; |
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| 330 | } |
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| 331 | |
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| 332 | |
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| 333 | G4DynamicParticleVector* G4KaonMinusAbsorptionAtRest::KaonNucleonReaction() |
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| 334 | { |
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| 335 | G4DynamicParticleVector* products = new G4DynamicParticleVector(); |
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| 336 | |
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| 337 | G4double ranflat = G4UniformRand(); |
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| 338 | G4double prob = 0; |
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| 339 | |
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| 340 | G4ParticleDefinition* producedBaryonDef; |
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| 341 | G4ParticleDefinition* producedMesonDef; |
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| 342 | |
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| 343 | G4double iniZ = nucleus->GetZ(); |
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| 344 | G4double iniA = nucleus->GetN(); |
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| 345 | |
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| 346 | G4DynamicParticle aNucleon = GetAbsorbingNucleon(); |
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| 347 | |
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| 348 | G4double nucleonMass; |
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| 349 | |
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| 350 | if (aNucleon.GetDefinition() == G4Proton::Proton()) |
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| 351 | { |
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| 352 | nucleonMass = proton_mass_c2+electron_mass_c2; |
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| 353 | if ( (prob += rateLambdaZeroPiZero) > ranflat) |
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| 354 | { // lambda pi0 |
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| 355 | producedBaryonDef = G4Lambda::Lambda(); |
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| 356 | producedMesonDef = G4PionZero::PionZero(); |
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| 357 | } |
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| 358 | else if ((prob += rateSigmaPlusPiMinus) > ranflat) |
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| 359 | { // sigma+ pi- |
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| 360 | producedBaryonDef = G4SigmaPlus::SigmaPlus(); |
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| 361 | producedMesonDef = G4PionMinus::PionMinus(); |
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| 362 | } |
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| 363 | else if ((prob += rateSigmaMinusPiPlus) > ranflat) |
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| 364 | { // sigma- pi+ |
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| 365 | producedBaryonDef = G4SigmaMinus::SigmaMinus(); |
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| 366 | producedMesonDef = G4PionPlus::PionPlus(); |
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| 367 | } |
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| 368 | else |
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| 369 | { // sigma0 pi0 |
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| 370 | producedBaryonDef = G4SigmaZero::SigmaZero(); |
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| 371 | producedMesonDef = G4PionZero::PionZero(); |
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| 372 | } |
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| 373 | } |
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| 374 | else if (aNucleon.GetDefinition() == G4Neutron::Neutron()) |
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| 375 | { |
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| 376 | nucleonMass = neutron_mass_c2; |
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| 377 | if ((prob += rateLambdaZeroPiMinus) > ranflat) |
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| 378 | { // lambda pi- |
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| 379 | producedBaryonDef = G4Lambda::Lambda(); |
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| 380 | producedMesonDef = G4PionMinus::PionMinus(); |
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| 381 | } |
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| 382 | else if ((prob += rateSigmaZeroPiMinus) > ranflat) |
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| 383 | { // sigma0 pi- |
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| 384 | producedBaryonDef = G4SigmaZero::SigmaZero(); |
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| 385 | producedMesonDef = G4PionMinus::PionMinus(); |
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| 386 | } |
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| 387 | else |
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| 388 | { // sigma- pi0 |
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| 389 | producedBaryonDef = G4SigmaMinus::SigmaMinus(); |
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| 390 | producedMesonDef = G4PionZero::PionZero(); |
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| 391 | } |
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| 392 | } |
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| 393 | else |
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| 394 | { |
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| 395 | if (verboseLevel>0) |
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| 396 | { |
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| 397 | G4cout |
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| 398 | << "G4KaonMinusAbsorption::KaonNucleonReaction: " |
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| 399 | << aNucleon.GetDefinition()->GetParticleName() |
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| 400 | << " is not a good nucleon - check G4Nucleus::ReturnTargetParticle()!" |
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| 401 | << G4endl; |
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| 402 | } |
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| 403 | return 0; |
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| 404 | } |
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| 405 | |
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| 406 | G4double newZ = nucleus->GetZ(); |
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| 407 | G4double newA = nucleus->GetN(); |
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| 408 | |
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| 409 | // Modify the Kaon mass to take nuclear binding energy into account |
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| 410 | // .. using mas formula .. |
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| 411 | // .. using mass table .. |
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| 412 | // equivalent to -'initialBindingEnergy+nucleus.GetBindingEnergy' ! |
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| 413 | |
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| 414 | G4double nucleonBindingEnergy = |
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[962] | 415 | -G4NucleiProperties::GetBindingEnergy(static_cast<G4int>(iniA), static_cast<G4int>(iniZ) ) |
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| 416 | +G4NucleiProperties::GetBindingEnergy(static_cast<G4int>(newA), static_cast<G4int>(newZ) ); |
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[819] | 417 | |
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| 418 | G4DynamicParticle modifiedHadron = (*stoppedHadron); |
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| 419 | modifiedHadron.SetMass(stoppedHadron->GetMass() + nucleonBindingEnergy); |
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| 420 | |
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| 421 | // Setup outgoing dynamic particles |
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| 422 | G4ThreeVector dummy(0.,0.,0.); |
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| 423 | G4DynamicParticle* producedBaryon = new G4DynamicParticle(producedBaryonDef,dummy); |
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| 424 | G4DynamicParticle* producedMeson = new G4DynamicParticle(producedMesonDef,dummy); |
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| 425 | |
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| 426 | // Produce the secondary particles in a twobody process: |
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| 427 | G4ReactionKinematics theReactionKinematics; |
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| 428 | theReactionKinematics.TwoBodyScattering( &modifiedHadron, &aNucleon, |
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| 429 | producedBaryon, producedMeson); |
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| 430 | |
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| 431 | products->push_back(producedBaryon); |
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| 432 | products->push_back(producedMeson); |
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| 433 | |
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| 434 | if (verboseLevel > 1) |
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| 435 | { |
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| 436 | G4cout |
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| 437 | << "G4KaonMinusAbsorption::KaonNucleonReaction: Number of primaries = " |
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| 438 | << products->size() |
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| 439 | << ": " <<producedMesonDef->GetParticleName() |
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| 440 | << ", " <<producedBaryonDef->GetParticleName() << G4endl; |
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| 441 | } |
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| 442 | |
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| 443 | return products; |
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| 444 | } |
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| 445 | |
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| 446 | |
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| 447 | G4bool G4KaonMinusAbsorptionAtRest::AbsorbPionByNucleus(G4DynamicParticle* aPion) |
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| 448 | { |
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| 449 | // Needs some more investigation! |
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| 450 | |
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| 451 | G4double ranflat = G4UniformRand(); |
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| 452 | |
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| 453 | if (ranflat < pionAbsorptionRate){ |
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| 454 | // Add pion energy to ExcitationEnergy and NucleusMomentum |
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| 455 | nucleus->AddExcitationEnergy(aPion->GetTotalEnergy()); |
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| 456 | nucleus->AddMomentum(aPion->GetMomentum()); |
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| 457 | } |
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| 458 | |
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| 459 | return (ranflat < pionAbsorptionRate); |
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| 460 | } |
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| 461 | |
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| 462 | G4DynamicParticle* G4KaonMinusAbsorptionAtRest::SigmaLambdaConversion(G4DynamicParticle* aSigma) |
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| 463 | { |
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| 464 | G4double ranflat = G4UniformRand(); |
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| 465 | G4double sigmaLambdaConversionRate; |
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| 466 | |
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| 467 | G4double A = nucleus->GetN(); |
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| 468 | G4double Z = nucleus->GetZ(); |
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| 469 | |
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| 470 | G4double newZ = Z; |
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| 471 | G4double nucleonMassDifference = 0; |
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| 472 | |
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| 473 | G4ParticleDefinition* inNucleonDef=NULL; |
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| 474 | G4ParticleDefinition* outNucleonDef=NULL; |
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| 475 | |
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| 476 | // Decide which sigma |
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| 477 | switch((int) aSigma->GetDefinition()->GetPDGCharge()) { |
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| 478 | |
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| 479 | case 1: |
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| 480 | sigmaLambdaConversionRate = sigmaPlusLambdaConversionRate; |
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| 481 | inNucleonDef = G4Neutron::Neutron(); |
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| 482 | outNucleonDef = G4Proton::Proton(); |
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| 483 | newZ = Z+1; |
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| 484 | nucleonMassDifference = neutron_mass_c2 - proton_mass_c2-electron_mass_c2; |
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| 485 | break; |
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| 486 | |
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| 487 | case -1: |
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| 488 | sigmaLambdaConversionRate = sigmaMinusLambdaConversionRate; |
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| 489 | inNucleonDef = G4Proton::Proton(); |
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| 490 | outNucleonDef = G4Neutron::Neutron(); |
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| 491 | newZ = Z-1; |
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| 492 | nucleonMassDifference = proton_mass_c2+electron_mass_c2 - neutron_mass_c2; |
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| 493 | break; |
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| 494 | |
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| 495 | case 0: |
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| 496 | sigmaLambdaConversionRate = sigmaZeroLambdaConversionRate; |
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| 497 | // The 'outgoing' nucleon is just virtual, to keep the energy-momentum |
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| 498 | // balance and will not appear in the ParticleChange. Therefore no need |
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| 499 | // choose between neutron and proton here! |
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| 500 | inNucleonDef = G4Neutron::Neutron(); |
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| 501 | outNucleonDef = G4Neutron::Neutron(); |
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| 502 | break; |
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| 503 | |
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| 504 | default: |
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| 505 | sigmaLambdaConversionRate = 0.; |
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| 506 | } |
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| 507 | |
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| 508 | if (ranflat >= sigmaLambdaConversionRate) return 0; |
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| 509 | |
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| 510 | G4ThreeVector dummy(0.,0.,0.); |
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| 511 | |
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| 512 | // Fermi momentum distribution in three dimensions |
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| 513 | G4ThreeVector momentum = nucleus->GetFermiMomentum(); |
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| 514 | |
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| 515 | G4ParticleDefinition* lambdaDef = G4Lambda::Lambda(); |
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| 516 | |
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| 517 | G4DynamicParticle inNucleon(inNucleonDef,momentum); |
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| 518 | G4DynamicParticle outNucleon(outNucleonDef,dummy); |
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| 519 | G4DynamicParticle* outLambda = new G4DynamicParticle(lambdaDef,dummy); |
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| 520 | |
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| 521 | G4ReactionKinematics theReactionKinematics; |
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| 522 | |
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| 523 | // Now do the twobody scattering |
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| 524 | theReactionKinematics.TwoBodyScattering(aSigma, &inNucleon, |
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| 525 | &outNucleon, outLambda); |
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| 526 | |
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| 527 | // Binding energy of nucleus has changed. This will change the |
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| 528 | // ExcitationEnergy. |
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| 529 | // .. using mass formula .. |
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| 530 | // .. using mass table .. |
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| 531 | // equivalent to -'initialBindingEnergy+nucleus.GetBindingEnergy' ! |
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[962] | 532 | |
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[819] | 533 | // Add energy and momentum to nucleus, change Z,A |
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| 534 | nucleus->AddExcitationEnergy(outNucleon.GetKineticEnergy()); |
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| 535 | nucleus->AddMomentum(outNucleon.GetMomentum()); |
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| 536 | nucleus->SetParameters(A,newZ); |
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| 537 | |
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| 538 | // The calling routine is responsible to delete the sigma!! |
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| 539 | return outLambda; |
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| 540 | } |
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| 541 | |
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| 542 | |
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| 543 | |
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