[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 | // G4AntiProtonAnnihilationAtRest physics process |
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| 27 | // Larry Felawka (TRIUMF), April 1998 |
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| 28 | //--------------------------------------------------------------------- |
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| 29 | |
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| 30 | #include "G4AntiProtonAnnihilationAtRest.hh" |
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| 31 | #include "G4DynamicParticle.hh" |
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| 32 | #include "G4ParticleTypes.hh" |
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| 33 | #include "Randomize.hh" |
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[1055] | 34 | #include "G4HadronicProcessStore.hh" |
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[819] | 35 | #include <string.h> |
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| 36 | #include <cmath> |
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| 37 | #include <stdio.h> |
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| 38 | |
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| 39 | #define MAX_SECONDARIES 100 |
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| 40 | |
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| 41 | // constructor |
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| 42 | |
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| 43 | G4AntiProtonAnnihilationAtRest::G4AntiProtonAnnihilationAtRest(const G4String& processName, |
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| 44 | G4ProcessType aType ) : |
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| 45 | G4VRestProcess (processName, aType), // initialization |
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| 46 | massPionMinus(G4PionMinus::PionMinus()->GetPDGMass()/GeV), |
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| 47 | massProton(G4Proton::Proton()->GetPDGMass()/GeV), |
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| 48 | massPionZero(G4PionZero::PionZero()->GetPDGMass()/GeV), |
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| 49 | massAntiProton(G4AntiProton::AntiProton()->GetPDGMass()/GeV), |
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| 50 | massPionPlus(G4PionPlus::PionPlus()->GetPDGMass()/GeV), |
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| 51 | massGamma(G4Gamma::Gamma()->GetPDGMass()/GeV), |
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| 52 | pdefGamma(G4Gamma::Gamma()), |
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| 53 | pdefPionPlus(G4PionPlus::PionPlus()), |
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| 54 | pdefPionZero(G4PionZero::PionZero()), |
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| 55 | pdefPionMinus(G4PionMinus::PionMinus()), |
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| 56 | pdefProton(G4Proton::Proton()), |
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| 57 | pdefAntiProton(G4AntiProton::AntiProton()), |
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| 58 | pdefNeutron(G4Neutron::Neutron()), |
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| 59 | pdefDeuteron(G4Deuteron::Deuteron()), |
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| 60 | pdefTriton(G4Triton::Triton()), |
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| 61 | pdefAlpha(G4Alpha::Alpha()) |
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| 62 | { |
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| 63 | if (verboseLevel>0) { |
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| 64 | G4cout << GetProcessName() << " is created "<< G4endl; |
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| 65 | } |
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[962] | 66 | SetProcessSubType(fHadronAtRest); |
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[819] | 67 | pv = new G4GHEKinematicsVector [MAX_SECONDARIES+1]; |
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| 68 | eve = new G4GHEKinematicsVector [MAX_SECONDARIES]; |
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| 69 | gkin = new G4GHEKinematicsVector [MAX_SECONDARIES]; |
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| 70 | |
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[1055] | 71 | G4HadronicProcessStore::Instance()->RegisterExtraProcess(this); |
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[819] | 72 | } |
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| 73 | |
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| 74 | // destructor |
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| 75 | |
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| 76 | G4AntiProtonAnnihilationAtRest::~G4AntiProtonAnnihilationAtRest() |
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| 77 | { |
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[1055] | 78 | G4HadronicProcessStore::Instance()->DeRegisterExtraProcess(this); |
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[819] | 79 | delete [] pv; |
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| 80 | delete [] eve; |
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| 81 | delete [] gkin; |
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| 82 | } |
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| 83 | |
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[1055] | 84 | void G4AntiProtonAnnihilationAtRest::PreparePhysicsTable(const G4ParticleDefinition& p) |
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| 85 | { |
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| 86 | G4HadronicProcessStore::Instance()->RegisterParticleForExtraProcess(this, &p); |
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| 87 | } |
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| 88 | |
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| 89 | void G4AntiProtonAnnihilationAtRest::BuildPhysicsTable(const G4ParticleDefinition& p) |
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| 90 | { |
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| 91 | G4HadronicProcessStore::Instance()->PrintInfo(&p); |
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| 92 | } |
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[819] | 93 | |
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| 94 | // methods............................................................................. |
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| 95 | |
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| 96 | G4bool G4AntiProtonAnnihilationAtRest::IsApplicable( |
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| 97 | const G4ParticleDefinition& particle |
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| 98 | ) |
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| 99 | { |
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| 100 | return ( &particle == pdefAntiProton ); |
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| 101 | |
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| 102 | } |
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| 103 | |
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| 104 | // Warning - this method may be optimized away if made "inline" |
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| 105 | G4int G4AntiProtonAnnihilationAtRest::GetNumberOfSecondaries() |
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| 106 | { |
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| 107 | return ( ngkine ); |
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| 108 | |
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| 109 | } |
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| 110 | |
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| 111 | // Warning - this method may be optimized away if made "inline" |
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| 112 | G4GHEKinematicsVector* G4AntiProtonAnnihilationAtRest::GetSecondaryKinematics() |
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| 113 | { |
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| 114 | return ( &gkin[0] ); |
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| 115 | |
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| 116 | } |
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| 117 | |
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| 118 | G4double G4AntiProtonAnnihilationAtRest::AtRestGetPhysicalInteractionLength( |
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| 119 | const G4Track& track, |
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| 120 | G4ForceCondition* condition |
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| 121 | ) |
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| 122 | { |
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| 123 | // beggining of tracking |
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| 124 | ResetNumberOfInteractionLengthLeft(); |
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| 125 | |
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| 126 | // condition is set to "Not Forced" |
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| 127 | *condition = NotForced; |
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| 128 | |
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| 129 | // get mean life time |
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| 130 | currentInteractionLength = GetMeanLifeTime(track, condition); |
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| 131 | |
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| 132 | if ((currentInteractionLength <0.0) || (verboseLevel>2)){ |
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| 133 | G4cout << "G4AntiProtonAnnihilationAtRestProcess::AtRestGetPhysicalInteractionLength "; |
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| 134 | G4cout << "[ " << GetProcessName() << "]" <<G4endl; |
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| 135 | track.GetDynamicParticle()->DumpInfo(); |
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| 136 | G4cout << " in Material " << track.GetMaterial()->GetName() <<G4endl; |
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| 137 | G4cout << "MeanLifeTime = " << currentInteractionLength/ns << "[ns]" <<G4endl; |
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| 138 | } |
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| 139 | |
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| 140 | return theNumberOfInteractionLengthLeft * currentInteractionLength; |
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| 141 | |
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| 142 | } |
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| 143 | |
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| 144 | G4VParticleChange* G4AntiProtonAnnihilationAtRest::AtRestDoIt( |
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| 145 | const G4Track& track, |
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| 146 | const G4Step& |
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| 147 | ) |
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| 148 | // |
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| 149 | // Handles AntiProtons at rest; a AntiProton can either create secondaries or |
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| 150 | // do nothing (in which case it should be sent back to decay-handling |
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| 151 | // section |
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| 152 | // |
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| 153 | { |
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| 154 | |
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| 155 | // Initialize ParticleChange |
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| 156 | // all members of G4VParticleChange are set to equal to |
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| 157 | // corresponding member in G4Track |
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| 158 | |
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| 159 | aParticleChange.Initialize(track); |
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| 160 | |
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| 161 | // Store some global quantities that depend on current material and particle |
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| 162 | |
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| 163 | globalTime = track.GetGlobalTime()/s; |
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| 164 | G4Material * aMaterial = track.GetMaterial(); |
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| 165 | const G4int numberOfElements = aMaterial->GetNumberOfElements(); |
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| 166 | const G4ElementVector* theElementVector = aMaterial->GetElementVector(); |
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| 167 | |
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| 168 | const G4double* theAtomicNumberDensity = aMaterial->GetAtomicNumDensityVector(); |
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| 169 | G4double normalization = 0; |
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| 170 | for ( G4int i1=0; i1 < numberOfElements; i1++ ) |
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| 171 | { |
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| 172 | normalization += theAtomicNumberDensity[i1] ; // change when nucleon specific |
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| 173 | // probabilities are included. |
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| 174 | } |
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| 175 | G4double runningSum= 0.; |
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| 176 | G4double random = G4UniformRand()*normalization; |
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| 177 | for ( G4int i2=0; i2 < numberOfElements; i2++ ) |
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| 178 | { |
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| 179 | runningSum += theAtomicNumberDensity[i2]; // change when nucleon specific |
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| 180 | // probabilities are included. |
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| 181 | if (random<=runningSum) |
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| 182 | { |
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| 183 | targetCharge = G4double((*theElementVector)[i2]->GetZ()); |
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| 184 | targetAtomicMass = (*theElementVector)[i2]->GetN(); |
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| 185 | } |
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| 186 | } |
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| 187 | if (random>runningSum) |
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| 188 | { |
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| 189 | targetCharge = G4double((*theElementVector)[numberOfElements-1]->GetZ()); |
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| 190 | targetAtomicMass = (*theElementVector)[numberOfElements-1]->GetN(); |
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| 191 | |
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| 192 | } |
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| 193 | |
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| 194 | if (verboseLevel>1) { |
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| 195 | G4cout << "G4AntiProtonAnnihilationAtRest::AtRestDoIt is invoked " <<G4endl; |
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| 196 | } |
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| 197 | |
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| 198 | G4ParticleMomentum momentum; |
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| 199 | G4float localtime; |
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| 200 | |
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| 201 | G4ThreeVector position = track.GetPosition(); |
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| 202 | |
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| 203 | GenerateSecondaries(); // Generate secondaries |
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| 204 | |
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| 205 | aParticleChange.SetNumberOfSecondaries( ngkine ); |
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| 206 | |
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| 207 | for ( G4int isec = 0; isec < ngkine; isec++ ) { |
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| 208 | G4DynamicParticle* aNewParticle = new G4DynamicParticle; |
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| 209 | aNewParticle->SetDefinition( gkin[isec].GetParticleDef() ); |
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| 210 | aNewParticle->SetMomentum( gkin[isec].GetMomentum() * GeV ); |
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| 211 | |
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| 212 | localtime = globalTime + gkin[isec].GetTOF(); |
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| 213 | |
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| 214 | G4Track* aNewTrack = new G4Track( aNewParticle, localtime*s, position ); |
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| 215 | aNewTrack->SetTouchableHandle(track.GetTouchableHandle()); |
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| 216 | aParticleChange.AddSecondary( aNewTrack ); |
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| 217 | |
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| 218 | } |
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| 219 | |
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| 220 | aParticleChange.ProposeLocalEnergyDeposit( 0.0*GeV ); |
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| 221 | |
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| 222 | aParticleChange.ProposeTrackStatus(fStopAndKill); // Kill the incident AntiProton |
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| 223 | |
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| 224 | // clear InteractionLengthLeft |
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| 225 | |
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| 226 | ResetNumberOfInteractionLengthLeft(); |
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| 227 | |
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| 228 | return &aParticleChange; |
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| 229 | |
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| 230 | } |
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| 231 | |
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| 232 | |
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| 233 | void G4AntiProtonAnnihilationAtRest::GenerateSecondaries() |
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| 234 | { |
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| 235 | static G4int index; |
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| 236 | static G4int l; |
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| 237 | static G4int nopt; |
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| 238 | static G4int i; |
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| 239 | static G4ParticleDefinition* jnd; |
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| 240 | |
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| 241 | for (i = 1; i <= MAX_SECONDARIES; ++i) { |
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| 242 | pv[i].SetZero(); |
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| 243 | } |
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| 244 | |
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| 245 | ngkine = 0; // number of generated secondary particles |
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| 246 | ntot = 0; |
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| 247 | result.SetZero(); |
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| 248 | result.SetMass( massAntiProton ); |
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| 249 | result.SetKineticEnergyAndUpdate( 0. ); |
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| 250 | result.SetTOF( 0. ); |
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| 251 | result.SetParticleDef( pdefAntiProton ); |
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| 252 | |
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| 253 | AntiProtonAnnihilation(&nopt); |
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| 254 | |
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| 255 | // *** CHECK WHETHER THERE ARE NEW PARTICLES GENERATED *** |
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| 256 | if (ntot != 0 || result.GetParticleDef() != pdefAntiProton) { |
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| 257 | // *** CURRENT PARTICLE IS NOT THE SAME AS IN THE BEGINNING OR/AND *** |
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| 258 | // *** ONE OR MORE SECONDARIES HAVE BEEN GENERATED *** |
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| 259 | |
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| 260 | // --- INITIAL PARTICLE TYPE HAS BEEN CHANGED ==> PUT NEW TYPE ON --- |
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| 261 | // --- THE GEANT TEMPORARY STACK --- |
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| 262 | |
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| 263 | // --- PUT PARTICLE ON THE STACK --- |
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| 264 | gkin[0] = result; |
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| 265 | gkin[0].SetTOF( result.GetTOF() * 5e-11 ); |
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| 266 | ngkine = 1; |
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| 267 | |
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| 268 | // --- ALL QUANTITIES ARE TAKEN FROM THE GHEISHA STACK WHERE THE --- |
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| 269 | // --- CONVENTION IS THE FOLLOWING --- |
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| 270 | |
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| 271 | // --- ONE OR MORE SECONDARIES HAVE BEEN GENERATED --- |
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| 272 | for (l = 1; l <= ntot; ++l) { |
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| 273 | index = l - 1; |
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| 274 | jnd = eve[index].GetParticleDef(); |
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| 275 | |
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| 276 | // --- ADD PARTICLE TO THE STACK IF STACK NOT YET FULL --- |
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| 277 | if (ngkine < MAX_SECONDARIES) { |
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| 278 | gkin[ngkine] = eve[index]; |
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| 279 | gkin[ngkine].SetTOF( eve[index].GetTOF() * 5e-11 ); |
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| 280 | ++ngkine; |
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| 281 | } |
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| 282 | } |
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| 283 | } |
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| 284 | else { |
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| 285 | // --- NO SECONDARIES GENERATED AND PARTICLE IS STILL THE SAME --- |
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| 286 | // --- ==> COPY EVERYTHING BACK IN THE CURRENT GEANT STACK --- |
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| 287 | ngkine = 0; |
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| 288 | ntot = 0; |
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| 289 | globalTime += result.GetTOF() * G4float(5e-11); |
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| 290 | } |
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| 291 | |
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| 292 | // --- LIMIT THE VALUE OF NGKINE IN CASE OF OVERFLOW --- |
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| 293 | ngkine = G4int(std::min(ngkine,G4int(MAX_SECONDARIES))); |
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| 294 | |
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| 295 | } // GenerateSecondaries |
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| 296 | |
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| 297 | |
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| 298 | void G4AntiProtonAnnihilationAtRest::Poisso(G4float xav, G4int *iran) |
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| 299 | { |
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| 300 | static G4int i; |
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| 301 | static G4float r, p1, p2, p3; |
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| 302 | static G4int mm; |
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| 303 | static G4float rr, ran, rrr, ran1; |
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| 304 | |
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| 305 | // *** GENERATION OF POISSON DISTRIBUTION *** |
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| 306 | // *** NVE 16-MAR-1988 CERN GENEVA *** |
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| 307 | // ORIGIN : H.FESEFELDT (27-OCT-1983) |
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| 308 | |
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| 309 | // --- USE NORMAL DISTRIBUTION FOR <X> > 9.9 --- |
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| 310 | if (xav > G4float(9.9)) { |
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| 311 | // ** NORMAL DISTRIBUTION WITH SIGMA**2 = <X> |
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| 312 | Normal(&ran1); |
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| 313 | ran1 = xav + ran1 * std::sqrt(xav); |
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| 314 | *iran = G4int(ran1); |
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| 315 | if (*iran < 0) { |
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| 316 | *iran = 0; |
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| 317 | } |
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| 318 | } |
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| 319 | else { |
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| 320 | mm = G4int(xav * G4float(5.)); |
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| 321 | *iran = 0; |
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| 322 | if (mm > 0) { |
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| 323 | r = std::exp(-G4double(xav)); |
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| 324 | ran1 = G4UniformRand(); |
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| 325 | if (ran1 > r) { |
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| 326 | rr = r; |
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| 327 | for (i = 1; i <= mm; ++i) { |
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| 328 | ++(*iran); |
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| 329 | if (i <= 5) { |
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| 330 | rrr = std::pow(xav, G4float(i)) / NFac(i); |
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| 331 | } |
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| 332 | // ** STIRLING' S FORMULA FOR LARGE NUMBERS |
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| 333 | if (i > 5) { |
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| 334 | rrr = std::exp(i * std::log(xav) - |
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| 335 | (i + G4float(.5)) * std::log(i * G4float(1.)) + |
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| 336 | i - G4float(.9189385)); |
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| 337 | } |
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| 338 | rr += r * rrr; |
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| 339 | if (ran1 <= rr) { |
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| 340 | break; |
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| 341 | } |
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| 342 | } |
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| 343 | } |
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| 344 | } |
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| 345 | else { |
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| 346 | // ** FOR VERY SMALL XAV TRY IRAN=1,2,3 |
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| 347 | p1 = xav * std::exp(-G4double(xav)); |
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| 348 | p2 = xav * p1 / G4float(2.); |
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| 349 | p3 = xav * p2 / G4float(3.); |
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| 350 | ran = G4UniformRand(); |
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| 351 | if (ran >= p3) { |
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| 352 | if (ran >= p2) { |
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| 353 | if (ran >= p1) { |
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| 354 | *iran = 0; |
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| 355 | } |
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| 356 | else { |
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| 357 | *iran = 1; |
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| 358 | } |
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| 359 | } |
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| 360 | else { |
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| 361 | *iran = 2; |
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| 362 | } |
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| 363 | } |
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| 364 | else { |
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| 365 | *iran = 3; |
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| 366 | } |
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| 367 | } |
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| 368 | } |
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| 369 | |
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| 370 | } // Poisso |
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| 371 | |
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| 372 | |
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| 373 | G4int G4AntiProtonAnnihilationAtRest::NFac(G4int n) |
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| 374 | { |
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| 375 | G4int ret_val; |
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| 376 | |
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| 377 | static G4int i, m; |
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| 378 | |
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| 379 | // *** NVE 16-MAR-1988 CERN GENEVA *** |
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| 380 | // ORIGIN : H.FESEFELDT (27-OCT-1983) |
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| 381 | |
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| 382 | ret_val = 1; |
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| 383 | m = n; |
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| 384 | if (m > 1) { |
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| 385 | if (m > 10) { |
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| 386 | m = 10; |
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| 387 | } |
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| 388 | for (i = 2; i <= m; ++i) { |
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| 389 | ret_val *= i; |
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| 390 | } |
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| 391 | } |
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| 392 | return ret_val; |
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| 393 | |
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| 394 | } // NFac |
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| 395 | |
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| 396 | |
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| 397 | void G4AntiProtonAnnihilationAtRest::Normal(G4float *ran) |
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| 398 | { |
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| 399 | static G4int i; |
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| 400 | |
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| 401 | // *** NVE 14-APR-1988 CERN GENEVA *** |
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| 402 | // ORIGIN : H.FESEFELDT (27-OCT-1983) |
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| 403 | |
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| 404 | *ran = G4float(-6.); |
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| 405 | for (i = 1; i <= 12; ++i) { |
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| 406 | *ran += G4UniformRand(); |
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| 407 | } |
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| 408 | |
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| 409 | } // Normal |
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| 410 | |
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| 411 | |
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| 412 | void G4AntiProtonAnnihilationAtRest::AntiProtonAnnihilation(G4int *nopt) |
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| 413 | { |
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| 414 | static G4float brr[3] = { G4float(.125),G4float(.25),G4float(.5) }; |
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| 415 | |
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| 416 | G4float r__1; |
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| 417 | |
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| 418 | static G4int i, ii, kk; |
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| 419 | static G4int nt; |
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| 420 | static G4float cfa, eka; |
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| 421 | static G4int ika, nbl; |
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| 422 | static G4float ran, pcm; |
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| 423 | static G4int isw; |
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| 424 | static G4float tex; |
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| 425 | static G4ParticleDefinition* ipa1; |
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| 426 | static G4float ran1, ran2, ekin, tkin; |
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| 427 | static G4float targ; |
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| 428 | static G4ParticleDefinition* inve; |
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| 429 | static G4float ekin1, ekin2, black; |
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| 430 | static G4float pnrat, rmnve1, rmnve2; |
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| 431 | static G4float ek, en; |
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| 432 | |
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| 433 | // *** ANTI PROTON ANNIHILATION AT REST *** |
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| 434 | // *** NVE 04-MAR-1988 CERN GENEVA *** |
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| 435 | // ORIGIN : H.FESEFELDT (09-JULY-1987) |
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| 436 | |
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| 437 | // NOPT=0 NO ANNIHILATION |
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| 438 | // NOPT=1 ANNIH.IN PI+ PI- |
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| 439 | // NOPT=2 ANNIH.IN PI0 PI0 |
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| 440 | // NOPT=3 ANNIH.IN PI- PI0 |
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| 441 | // NOPT=4 ANNIH.IN GAMMA GAMMA |
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| 442 | |
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| 443 | pv[1].SetZero(); |
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| 444 | pv[1].SetMass( massAntiProton ); |
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| 445 | pv[1].SetKineticEnergyAndUpdate( 0. ); |
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| 446 | pv[1].SetTOF( result.GetTOF() ); |
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| 447 | pv[1].SetParticleDef( result.GetParticleDef() ); |
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| 448 | isw = 1; |
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| 449 | ran = G4UniformRand(); |
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| 450 | if (ran > brr[0]) { |
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| 451 | isw = 2; |
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| 452 | } |
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| 453 | if (ran > brr[1]) { |
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| 454 | isw = 3; |
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| 455 | } |
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| 456 | if (ran > brr[2]) { |
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| 457 | isw = 4; |
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| 458 | } |
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| 459 | *nopt = isw; |
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| 460 | // ** |
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| 461 | // ** EVAPORATION |
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| 462 | // ** |
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| 463 | if (isw == 1) { |
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| 464 | rmnve1 = massPionPlus; |
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| 465 | rmnve2 = massPionMinus; |
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| 466 | } |
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| 467 | else if (isw == 2) { |
---|
| 468 | rmnve1 = massPionZero; |
---|
| 469 | rmnve2 = massPionZero; |
---|
| 470 | } |
---|
| 471 | else if (isw == 3) { |
---|
| 472 | rmnve1 = massPionMinus; |
---|
| 473 | rmnve2 = massPionZero; |
---|
| 474 | } |
---|
| 475 | else if (isw == 4) { |
---|
| 476 | rmnve1 = massGamma; |
---|
| 477 | rmnve2 = massGamma; |
---|
| 478 | } |
---|
| 479 | ek = massProton + massAntiProton - rmnve1 - rmnve2; |
---|
| 480 | tkin = ExNu(ek); |
---|
| 481 | ek -= tkin; |
---|
| 482 | if (ek < G4float(1e-4)) { |
---|
| 483 | ek = G4float(1e-4); |
---|
| 484 | } |
---|
| 485 | ek *= G4float(.5); |
---|
| 486 | en = ek + (rmnve1 + rmnve2) * G4float(.5); |
---|
| 487 | r__1 = en * en - rmnve1 * rmnve2; |
---|
| 488 | pcm = r__1 > 0 ? std::sqrt(r__1) : 0; |
---|
| 489 | pv[2].SetZero(); |
---|
| 490 | pv[2].SetMass( rmnve1 ); |
---|
| 491 | pv[3].SetZero(); |
---|
| 492 | pv[3].SetMass( rmnve2 ); |
---|
| 493 | if (isw > 3) { |
---|
| 494 | pv[2].SetMass( 0. ); |
---|
| 495 | pv[3].SetMass( 0. ); |
---|
| 496 | } |
---|
| 497 | pv[2].SetEnergyAndUpdate( std::sqrt(pv[2].GetMass()*pv[2].GetMass()+pcm*pcm) ); |
---|
| 498 | pv[2].SetTOF( result.GetTOF() ); |
---|
| 499 | pv[3].SetEnergy( std::sqrt(pv[3].GetMass()*pv[3].GetMass()+pcm*pcm) ); |
---|
| 500 | pv[3].SetMomentumAndUpdate( -pv[2].GetMomentum().x(), -pv[2].GetMomentum().y(), -pv[2].GetMomentum().z() ); |
---|
| 501 | pv[3].SetTOF( result.GetTOF() ); |
---|
| 502 | switch ((int)isw) { |
---|
| 503 | case 1: |
---|
| 504 | pv[2].SetParticleDef( pdefPionPlus ); |
---|
| 505 | pv[3].SetParticleDef( pdefPionMinus ); |
---|
| 506 | break; |
---|
| 507 | case 2: |
---|
| 508 | pv[2].SetParticleDef( pdefPionZero ); |
---|
| 509 | pv[3].SetParticleDef( pdefPionZero ); |
---|
| 510 | break; |
---|
| 511 | case 3: |
---|
| 512 | pv[2].SetParticleDef( pdefPionMinus ); |
---|
| 513 | pv[3].SetParticleDef( pdefPionZero ); |
---|
| 514 | break; |
---|
| 515 | case 4: |
---|
| 516 | pv[2].SetParticleDef( pdefGamma ); |
---|
| 517 | pv[3].SetParticleDef( pdefGamma ); |
---|
| 518 | break; |
---|
| 519 | default: |
---|
| 520 | break; |
---|
| 521 | } |
---|
| 522 | nt = 3; |
---|
| 523 | if (targetAtomicMass >= G4float(1.5)) { |
---|
| 524 | cfa = (targetAtomicMass - G4float(1.)) / |
---|
| 525 | G4float(120.) * G4float(.025) * |
---|
| 526 | std::exp(-G4double(targetAtomicMass - G4float(1.)) / G4float(120.)); |
---|
| 527 | targ = G4float(1.); |
---|
| 528 | tex = evapEnergy1; |
---|
| 529 | if (tex >= G4float(.001)) { |
---|
| 530 | black = (targ * G4float(1.25) + |
---|
| 531 | G4float(1.5)) * evapEnergy1 / (evapEnergy1 + evapEnergy3); |
---|
| 532 | Poisso(black, &nbl); |
---|
| 533 | if (G4float(G4int(targ) + nbl) > targetAtomicMass) { |
---|
| 534 | nbl = G4int(targetAtomicMass - targ); |
---|
| 535 | } |
---|
| 536 | if (nt + nbl > (MAX_SECONDARIES - 2)) { |
---|
| 537 | nbl = (MAX_SECONDARIES - 2) - nt; |
---|
| 538 | } |
---|
| 539 | if (nbl > 0) { |
---|
| 540 | ekin = tex / nbl; |
---|
| 541 | ekin2 = G4float(0.); |
---|
| 542 | for (i = 1; i <= nbl; ++i) { |
---|
| 543 | if (nt == (MAX_SECONDARIES - 2)) { |
---|
| 544 | continue; |
---|
| 545 | } |
---|
| 546 | if (ekin2 > tex) { |
---|
| 547 | break; |
---|
| 548 | } |
---|
| 549 | ran1 = G4UniformRand(); |
---|
| 550 | Normal(&ran2); |
---|
| 551 | ekin1 = -G4double(ekin) * std::log(ran1) - |
---|
| 552 | cfa * (ran2 * G4float(.5) + G4float(1.)); |
---|
| 553 | if (ekin1 < G4float(0.)) { |
---|
| 554 | ekin1 = std::log(ran1) * G4float(-.01); |
---|
| 555 | } |
---|
| 556 | ekin1 *= G4float(1.); |
---|
| 557 | ekin2 += ekin1; |
---|
| 558 | if (ekin2 > tex) { |
---|
| 559 | ekin1 = tex - (ekin2 - ekin1); |
---|
| 560 | } |
---|
| 561 | if (ekin1 < G4float(0.)) { |
---|
| 562 | ekin1 = G4float(.001); |
---|
| 563 | } |
---|
| 564 | ipa1 = pdefNeutron; |
---|
| 565 | pnrat = G4float(1.) - targetCharge / targetAtomicMass; |
---|
| 566 | if (G4UniformRand() > pnrat) { |
---|
| 567 | ipa1 = pdefProton; |
---|
| 568 | } |
---|
| 569 | ++nt; |
---|
| 570 | pv[nt].SetZero(); |
---|
| 571 | pv[nt].SetMass( ipa1->GetPDGMass()/GeV ); |
---|
| 572 | pv[nt].SetKineticEnergyAndUpdate( ekin1 ); |
---|
| 573 | pv[nt].SetTOF( result.GetTOF() ); |
---|
| 574 | pv[nt].SetParticleDef( ipa1 ); |
---|
| 575 | } |
---|
| 576 | if (targetAtomicMass >= G4float(230.) && ek <= G4float(2.)) { |
---|
| 577 | ii = nt + 1; |
---|
| 578 | kk = 0; |
---|
| 579 | eka = ek; |
---|
| 580 | if (eka > G4float(1.)) { |
---|
| 581 | eka *= eka; |
---|
| 582 | } |
---|
| 583 | if (eka < G4float(.1)) { |
---|
| 584 | eka = G4float(.1); |
---|
| 585 | } |
---|
| 586 | ika = G4int(G4float(3.6) / eka); |
---|
| 587 | for (i = 1; i <= nt; ++i) { |
---|
| 588 | --ii; |
---|
| 589 | if (pv[ii].GetParticleDef() != pdefProton) { |
---|
| 590 | continue; |
---|
| 591 | } |
---|
| 592 | ipa1 = pdefNeutron; |
---|
| 593 | pv[ii].SetMass( ipa1->GetPDGMass()/GeV ); |
---|
| 594 | pv[ii].SetParticleDef( ipa1 ); |
---|
| 595 | ++kk; |
---|
| 596 | if (kk > ika) { |
---|
| 597 | break; |
---|
| 598 | } |
---|
| 599 | } |
---|
| 600 | } |
---|
| 601 | } |
---|
| 602 | } |
---|
| 603 | // ** |
---|
| 604 | // ** THEN ALSO DEUTERONS, TRITONS AND ALPHAS |
---|
| 605 | // ** |
---|
| 606 | tex = evapEnergy3; |
---|
| 607 | if (tex >= G4float(.001)) { |
---|
| 608 | black = (targ * G4float(1.25) + G4float(1.5)) * evapEnergy3 / |
---|
| 609 | (evapEnergy1 + evapEnergy3); |
---|
| 610 | Poisso(black, &nbl); |
---|
| 611 | if (nt + nbl > (MAX_SECONDARIES - 2)) { |
---|
| 612 | nbl = (MAX_SECONDARIES - 2) - nt; |
---|
| 613 | } |
---|
| 614 | if (nbl > 0) { |
---|
| 615 | ekin = tex / nbl; |
---|
| 616 | ekin2 = G4float(0.); |
---|
| 617 | for (i = 1; i <= nbl; ++i) { |
---|
| 618 | if (nt == (MAX_SECONDARIES - 2)) { |
---|
| 619 | continue; |
---|
| 620 | } |
---|
| 621 | if (ekin2 > tex) { |
---|
| 622 | break; |
---|
| 623 | } |
---|
| 624 | ran1 = G4UniformRand(); |
---|
| 625 | Normal(&ran2); |
---|
| 626 | ekin1 = -G4double(ekin) * std::log(ran1) - |
---|
| 627 | cfa * (ran2 * G4float(.5) + G4float(1.)); |
---|
| 628 | if (ekin1 < G4float(0.)) { |
---|
| 629 | ekin1 = std::log(ran1) * G4float(-.01); |
---|
| 630 | } |
---|
| 631 | ekin1 *= G4float(1.); |
---|
| 632 | ekin2 += ekin1; |
---|
| 633 | if (ekin2 > tex) { |
---|
| 634 | ekin1 = tex - (ekin2 - ekin1); |
---|
| 635 | } |
---|
| 636 | if (ekin1 < G4float(0.)) { |
---|
| 637 | ekin1 = G4float(.001); |
---|
| 638 | } |
---|
| 639 | ran = G4UniformRand(); |
---|
| 640 | inve = pdefDeuteron; |
---|
| 641 | if (ran > G4float(.6)) { |
---|
| 642 | inve = pdefTriton; |
---|
| 643 | } |
---|
| 644 | if (ran > G4float(.9)) { |
---|
| 645 | inve = pdefAlpha; |
---|
| 646 | } |
---|
| 647 | ++nt; |
---|
| 648 | pv[nt].SetZero(); |
---|
| 649 | pv[nt].SetMass( inve->GetPDGMass()/GeV ); |
---|
| 650 | pv[nt].SetKineticEnergyAndUpdate( ekin1 ); |
---|
| 651 | pv[nt].SetTOF( result.GetTOF() ); |
---|
| 652 | pv[nt].SetParticleDef( inve ); |
---|
| 653 | } |
---|
| 654 | } |
---|
| 655 | } |
---|
| 656 | } |
---|
| 657 | result = pv[2]; |
---|
| 658 | if (nt == 2) { |
---|
| 659 | return; |
---|
| 660 | } |
---|
| 661 | for (i = 3; i <= nt; ++i) { |
---|
| 662 | if (ntot >= MAX_SECONDARIES) { |
---|
| 663 | return; |
---|
| 664 | } |
---|
| 665 | eve[ntot++] = pv[i]; |
---|
| 666 | } |
---|
| 667 | |
---|
| 668 | } // AntiProtonAnnihilation |
---|
| 669 | |
---|
| 670 | |
---|
| 671 | G4double G4AntiProtonAnnihilationAtRest::ExNu(G4float ek1) |
---|
| 672 | { |
---|
| 673 | G4float ret_val, r__1; |
---|
| 674 | |
---|
| 675 | static G4float cfa, gfa, ran1, ran2, ekin1, atno3; |
---|
| 676 | static G4int magic; |
---|
| 677 | static G4float fpdiv; |
---|
| 678 | |
---|
| 679 | // *** NUCLEAR EVAPORATION AS FUNCTION OF ATOMIC NUMBER ATNO *** |
---|
| 680 | // *** AND KINETIC ENERGY EKIN OF PRIMARY PARTICLE *** |
---|
| 681 | // *** NVE 04-MAR-1988 CERN GENEVA *** |
---|
| 682 | // ORIGIN : H.FESEFELDT (10-DEC-1986) |
---|
| 683 | |
---|
| 684 | ret_val = G4float(0.); |
---|
| 685 | if (targetAtomicMass >= G4float(1.5)) { |
---|
| 686 | magic = 0; |
---|
| 687 | if (G4int(targetCharge + G4float(.1)) == 82) { |
---|
| 688 | magic = 1; |
---|
| 689 | } |
---|
| 690 | ekin1 = ek1; |
---|
| 691 | if (ekin1 < G4float(.1)) { |
---|
| 692 | ekin1 = G4float(.1); |
---|
| 693 | } |
---|
| 694 | if (ekin1 > G4float(4.)) { |
---|
| 695 | ekin1 = G4float(4.); |
---|
| 696 | } |
---|
| 697 | // ** 0.35 VALUE AT 1 GEV |
---|
| 698 | // ** 0.05 VALUE AT 0.1 GEV |
---|
| 699 | cfa = G4float(.13043478260869565); |
---|
| 700 | cfa = cfa * std::log(ekin1) + G4float(.35); |
---|
| 701 | if (cfa < G4float(.15)) { |
---|
| 702 | cfa = G4float(.15); |
---|
| 703 | } |
---|
| 704 | ret_val = cfa * G4float(7.716) * std::exp(-G4double(cfa)); |
---|
| 705 | atno3 = targetAtomicMass; |
---|
| 706 | if (atno3 > G4float(120.)) { |
---|
| 707 | atno3 = G4float(120.); |
---|
| 708 | } |
---|
| 709 | cfa = (atno3 - G4float(1.)) / |
---|
| 710 | G4float(120.) * std::exp(-G4double(atno3 - G4float(1.)) / G4float(120.)); |
---|
| 711 | ret_val *= cfa; |
---|
| 712 | r__1 = ekin1; |
---|
| 713 | fpdiv = G4float(1.) - r__1 * r__1 * G4float(.25); |
---|
| 714 | if (fpdiv < G4float(.5)) { |
---|
| 715 | fpdiv = G4float(.5); |
---|
| 716 | } |
---|
| 717 | gfa = (targetAtomicMass - G4float(1.)) / |
---|
| 718 | G4float(70.) * G4float(2.) * |
---|
| 719 | std::exp(-G4double(targetAtomicMass - G4float(1.)) / G4float(70.)); |
---|
| 720 | evapEnergy1 = ret_val * fpdiv; |
---|
| 721 | evapEnergy3 = ret_val - evapEnergy1; |
---|
| 722 | Normal(&ran1); |
---|
| 723 | Normal(&ran2); |
---|
| 724 | if (magic == 1) { |
---|
| 725 | ran1 = G4float(0.); |
---|
| 726 | ran2 = G4float(0.); |
---|
| 727 | } |
---|
| 728 | evapEnergy1 *= ran1 * gfa + G4float(1.); |
---|
| 729 | if (evapEnergy1 < G4float(0.)) { |
---|
| 730 | evapEnergy1 = G4float(0.); |
---|
| 731 | } |
---|
| 732 | evapEnergy3 *= ran2 * gfa + G4float(1.); |
---|
| 733 | if (evapEnergy3 < G4float(0.)) { |
---|
| 734 | evapEnergy3 = G4float(0.); |
---|
| 735 | } |
---|
| 736 | while ((ret_val = evapEnergy1 + evapEnergy3) >= ek1) { |
---|
| 737 | evapEnergy1 *= G4float(1.) - G4UniformRand() * G4float(.5); |
---|
| 738 | evapEnergy3 *= G4float(1.) - G4UniformRand() * G4float(.5); |
---|
| 739 | } |
---|
| 740 | } |
---|
| 741 | return ret_val; |
---|
| 742 | |
---|
| 743 | } // ExNu |
---|