[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 | // |
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| 27 | // Implementation of the HETC88 code into Geant4. |
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| 28 | // Evaporation and De-excitation parts |
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| 29 | // T. Lampen, Helsinki Institute of Physics, May-2000 |
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| 30 | |
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| 31 | #include "globals.hh" |
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| 32 | #include "G4BertiniEvaporation.hh" |
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| 33 | #include "G4BENeutronChannel.hh" |
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| 34 | #include "G4BEProtonChannel.hh" |
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| 35 | #include "G4BEDeuteronChannel.hh" |
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| 36 | #include "G4BETritonChannel.hh" |
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| 37 | #include "G4BEHe3Channel.hh" |
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| 38 | #include "G4BEHe4Channel.hh" |
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| 39 | #include "G4BEGammaDeexcitation.hh" |
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| 40 | |
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| 41 | // verboseLevels : 4 inform about basic probabilities and branchings |
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| 42 | // 6 some details about calculations |
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| 43 | // 8 inform about final values |
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| 44 | // 10 inform everything |
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| 45 | |
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| 46 | G4BertiniEvaporation::G4BertiniEvaporation() |
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| 47 | { |
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| 48 | G4cout << "Info G4BertiniEvaporation: This is still very fresh code."<< G4endl; |
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| 49 | G4cout << " G4BertiniEvaporation: feed-back for improvement is very wellcome."<< G4endl; |
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| 50 | verboseLevel = 0; |
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| 51 | |
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| 52 | channelVector.push_back( new G4BENeutronChannel ); |
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| 53 | channelVector.push_back( new G4BEProtonChannel ); |
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| 54 | channelVector.push_back( new G4BEDeuteronChannel); |
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| 55 | channelVector.push_back( new G4BETritonChannel ); |
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| 56 | channelVector.push_back( new G4BEHe3Channel ); |
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| 57 | channelVector.push_back( new G4BEHe4Channel ); |
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| 58 | } |
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| 59 | |
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| 60 | |
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| 61 | G4BertiniEvaporation::~G4BertiniEvaporation() |
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| 62 | { |
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| 63 | while ( !channelVector.empty() ) |
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| 64 | { |
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| 65 | delete channelVector.back(); |
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| 66 | channelVector.pop_back(); |
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| 67 | } |
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| 68 | } |
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| 69 | |
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| 70 | |
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| 71 | void G4BertiniEvaporation::setVerboseLevel( const G4int verbose ) |
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| 72 | { |
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| 73 | verboseLevel = verbose; |
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| 74 | |
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| 75 | // Update verbose level to all evaporation channels. |
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| 76 | std::vector< G4BertiniEvaporationChannel * >::iterator iChannel = channelVector.begin(); |
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| 77 | for ( ; iChannel != channelVector.end() ; *iChannel++ ) |
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| 78 | ( *iChannel )->setVerboseLevel( verboseLevel ); |
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| 79 | } |
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| 80 | |
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| 81 | |
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| 82 | G4FragmentVector * G4BertiniEvaporation::BreakItUp( G4LayeredNucleus & nucleus ) |
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| 83 | { |
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| 84 | G4int nucleusA; |
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| 85 | G4int nucleusZ; |
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| 86 | G4int i; |
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| 87 | G4double totalProbability; |
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| 88 | G4double excE; |
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| 89 | G4double newExcitation; |
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| 90 | G4double nucleusTotalMomentum; |
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| 91 | G4double nucleusKineticEnergy; |
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| 92 | G4double mRes; // Mass of residual nucleus. |
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| 93 | G4ThreeVector nucleusMomentumVector; |
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| 94 | G4DynamicParticle *pEmittedParticle; |
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| 95 | std::vector< G4DynamicParticle * > secondaryParticleVector; |
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| 96 | G4FragmentVector * result = new G4FragmentVector; |
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| 97 | |
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| 98 | // Read properties of the nucleus. |
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| 99 | nucleusA = ( G4int ) nucleus.GetN(); // GetN should in fact get GetA |
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| 100 | nucleusZ = ( G4int ) nucleus.GetZ(); |
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| 101 | excE = nucleus.GetEnergyDeposit(); |
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| 102 | nucleusMomentumVector = nucleus.GetMomentum(); |
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| 103 | |
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| 104 | // Move to CMS frame, save initial velocity of the nucleus to boostToLab vector. |
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[962] | 105 | G4ThreeVector boostToLab( ( 1/G4NucleiProperties::GetNuclearMass( nucleusA, nucleusZ ) ) |
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[819] | 106 | * nucleusMomentumVector ); // xx mass ok? |
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| 107 | |
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| 108 | if ( verboseLevel >= 10 ) |
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| 109 | G4cout << " G4BertiniEvaporation : initial kinematics : boostToLab vector = " << boostToLab << G4endl |
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| 110 | << " excitation energy : " << excE<< G4endl; |
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| 111 | |
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| 112 | if ( nucleusA == 8 && nucleusZ == 4 ) |
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| 113 | { |
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| 114 | splitBe8( excE, boostToLab, secondaryParticleVector ); |
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| 115 | fillResult( secondaryParticleVector, result); |
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| 116 | return result; |
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| 117 | } |
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| 118 | |
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| 119 | // Initialize evaporation channels and calculate sum of emission |
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| 120 | // probabilities. |
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| 121 | std::vector< G4BertiniEvaporationChannel * >::iterator iChannel = channelVector.begin(); |
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| 122 | totalProbability = 0; |
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| 123 | for ( ; iChannel != channelVector.end() ; *iChannel++ ) |
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| 124 | { |
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| 125 | ( *iChannel )->setNucleusA( nucleusA ); |
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| 126 | ( *iChannel )->setNucleusZ( nucleusZ ); |
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| 127 | ( *iChannel )->setExcitationEnergy( excE ); |
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| 128 | ( *iChannel )->setPairingCorrection( 1 ); |
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| 129 | ( *iChannel )->calculateProbability(); |
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| 130 | totalProbability += ( *iChannel )->getProbability(); |
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| 131 | } |
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| 132 | |
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| 133 | // If no evaporation process is possible, try without pairing energy. |
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| 134 | if ( totalProbability == 0 ) |
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| 135 | { |
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| 136 | if ( verboseLevel >= 4 ) |
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| 137 | G4cout << "G4BertiniEvaporation : no emission possible with pairing correction, trying without it" << G4endl; |
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| 138 | for ( iChannel = channelVector.begin() ; iChannel != channelVector.end() ; *iChannel++ ) |
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| 139 | { |
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| 140 | ( *iChannel )->setPairingCorrection(0); |
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| 141 | ( *iChannel )->calculateProbability(); |
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| 142 | totalProbability += ( *iChannel )->getProbability(); |
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| 143 | } |
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| 144 | if ( verboseLevel >= 4 ) |
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| 145 | G4cout << " probability without correction " << totalProbability << G4endl; |
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| 146 | |
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| 147 | } |
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| 148 | |
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| 149 | // Normal evaporation cycle follows. |
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| 150 | // Particles are evaporated till all probabilities are zero. |
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| 151 | while ( totalProbability > 0 ) |
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| 152 | { |
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| 153 | G4BertiniEvaporationChannel *pSelectedChannel; |
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| 154 | |
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| 155 | // Sample active emission channel. |
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| 156 | G4double sampledProbability = G4UniformRand() * totalProbability; |
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| 157 | if ( verboseLevel >= 10 ) G4cout << " RandomProb : " << sampledProbability << G4endl; |
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| 158 | for ( iChannel = channelVector.begin() ; iChannel != channelVector.end() ; *iChannel++ ) |
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| 159 | { |
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| 160 | sampledProbability -= ( *iChannel )->getProbability(); |
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| 161 | if ( sampledProbability < 0 ) break; |
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| 162 | } |
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| 163 | pSelectedChannel = ( *iChannel ); |
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| 164 | if ( iChannel == channelVector.end() ) |
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| 165 | throw G4HadronicException(__FILE__, __LINE__, "G4BertiniEvaporation : Error while sampling evaporation particle" ); |
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| 166 | |
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| 167 | if ( verboseLevel >= 4 ) |
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| 168 | G4cout << "G4BertiniEvaporation : particle " << pSelectedChannel->getName() << " selected " << G4endl; |
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| 169 | |
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| 170 | // Max 10 tries to get a physically acceptable particle energy |
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| 171 | // in this emission channel. |
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| 172 | i = 0; |
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| 173 | |
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| 174 | do |
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| 175 | { |
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| 176 | pEmittedParticle = pSelectedChannel->emit(); |
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| 177 | // This loop checks that particle with too large energy is not emitted. |
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| 178 | // CMS frame is considered in this loop. Nonrelativistic treatment. xxx |
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| 179 | |
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| 180 | |
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| 181 | const G4int zRes = nucleusZ - pSelectedChannel->getParticleZ(); |
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| 182 | const G4int aRes = nucleusA - pSelectedChannel->getParticleA(); |
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| 183 | // const G4double eBind = G4NucleiProperties::GetBindingEnergy( aRes, zRes ); // Binding energy of the nucleus. |
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[962] | 184 | mRes = G4NucleiProperties::GetNuclearMass( aRes, zRes ); // Mass of the target nucleus |
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[819] | 185 | // In HETC88: |
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| 186 | // eBind = Z * (-0.78244) + A * 8.36755 - cameron ( A , Z ); |
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| 187 | // mRes = zRes * 938.79304 + ( aRes - zRes ) * 939.57548 - eBind; |
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| 188 | // where cameron ( A, Z ) is the mass excess by Cameron, see Canadian Journal of Physics, |
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| 189 | // vol. 35, 1957, p.1022 |
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| 190 | |
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| 191 | nucleusTotalMomentum = pEmittedParticle->GetTotalMomentum(); // CMS frame |
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| 192 | nucleusKineticEnergy = std::pow( nucleusTotalMomentum, 2 ) / ( 2 * mRes ); |
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| 193 | newExcitation = excE - pEmittedParticle->GetKineticEnergy() - nucleusKineticEnergy - pSelectedChannel->getQ(); |
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| 194 | |
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| 195 | if ( verboseLevel >= 10) |
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| 196 | G4cout << "G4BertiniEvaporation : Kinematics " << G4endl |
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| 197 | << " part kinetic E in CMS = " |
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| 198 | << pEmittedParticle->GetKineticEnergy() << G4endl |
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| 199 | << " new excitation E = " |
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| 200 | << newExcitation << G4endl; |
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| 201 | |
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| 202 | i++; |
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| 203 | if ( !( newExcitation > 0 ) && i < 10) delete pEmittedParticle; |
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| 204 | } while ( !( newExcitation > 0 ) && i < 10 ); |
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| 205 | |
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| 206 | if ( i >= 10 ) |
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| 207 | { |
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| 208 | // No appropriate particle energy found. |
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| 209 | // Set probability of this channel to zero |
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| 210 | // and try to sample another particle on the |
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| 211 | // next round. |
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| 212 | delete pEmittedParticle; |
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| 213 | |
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| 214 | if ( verboseLevel >= 4 ) |
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| 215 | G4cout << "G4BertiniEvaporation : No appropriate energy for particle " |
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| 216 | << pSelectedChannel->getName() << " found." << G4endl; |
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| 217 | |
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| 218 | pSelectedChannel->setProbability( 0 ); |
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| 219 | |
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| 220 | totalProbability = 0; |
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| 221 | for ( ; iChannel != channelVector.end() ; *iChannel++ ) |
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| 222 | totalProbability += ( *iChannel )->getProbability(); |
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| 223 | } // Treatment of physically unacceptable particle ends. |
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| 224 | else |
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| 225 | { |
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| 226 | // Good particle found. |
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| 227 | |
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| 228 | // Transform particle properties to lab frame and save it. |
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| 229 | G4LorentzVector particleFourVector = pEmittedParticle->Get4Momentum(); |
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| 230 | G4LorentzVector nucleusFourVector( - pEmittedParticle->GetMomentum(), // CMS Frame. |
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| 231 | nucleusKineticEnergy + mRes ); // Total energy. |
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| 232 | particleFourVector.boost( boostToLab ); |
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| 233 | nucleusFourVector.boost( boostToLab ); |
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| 234 | G4DynamicParticle *pPartLab = new G4DynamicParticle( pEmittedParticle->GetDefinition(), |
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| 235 | particleFourVector.e(), // Total energy |
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| 236 | particleFourVector.vect() ); // momentum vector |
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| 237 | secondaryParticleVector.push_back( pPartLab ); |
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| 238 | |
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| 239 | // Update residual nucleus and boostToLab vector. |
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| 240 | nucleusA = nucleusA - pSelectedChannel->getParticleA(); |
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| 241 | nucleusZ = nucleusZ - pSelectedChannel->getParticleZ(); |
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| 242 | excE = newExcitation; |
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| 243 | boostToLab = G4ThreeVector ( ( 1/mRes ) * nucleusFourVector.vect() ); |
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| 244 | |
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| 245 | if ( verboseLevel >= 10 ) |
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| 246 | G4cout << " particle mom in cms " << pEmittedParticle->GetMomentum() << G4endl |
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| 247 | << " particle mom in cms " << pEmittedParticle->GetTotalMomentum() << G4endl |
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| 248 | << " Etot in cms " << pEmittedParticle->GetTotalEnergy() << G4endl |
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| 249 | << " Ekin in cms " << pEmittedParticle->GetKineticEnergy() << G4endl |
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| 250 | << " particle mass " << pEmittedParticle->GetMass() << G4endl |
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| 251 | << " boost vect " << boostToLab << G4endl |
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| 252 | << " boosted 4v " << particleFourVector << G4endl |
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| 253 | << " nucleus 4v " << nucleusFourVector << G4endl |
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| 254 | << " nucl cm mom " << nucleusTotalMomentum << G4endl |
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| 255 | << " particle k.e. in lab " << pPartLab->GetKineticEnergy() << G4endl |
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| 256 | << " new boost vector " << boostToLab << G4endl; |
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| 257 | |
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| 258 | delete pEmittedParticle; |
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| 259 | |
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| 260 | // If the residual nucleus is Be8, split it. |
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| 261 | if ( nucleusA == 8 && nucleusZ == 4 ) |
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| 262 | { |
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| 263 | splitBe8( excE, boostToLab, secondaryParticleVector ); |
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| 264 | fillResult( secondaryParticleVector, result); |
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| 265 | return result; |
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| 266 | } |
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| 267 | |
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| 268 | // Update evaporation channels and |
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| 269 | // total emission probability. |
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| 270 | totalProbability = 0; |
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| 271 | for ( iChannel = channelVector.begin() ; iChannel != channelVector.end() ; *iChannel++ ) |
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| 272 | { |
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| 273 | ( *iChannel )->setNucleusA( nucleusA ); |
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| 274 | ( *iChannel )->setNucleusZ( nucleusZ ); |
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| 275 | ( *iChannel )->setExcitationEnergy( excE ); |
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| 276 | ( *iChannel )->calculateProbability(); |
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| 277 | totalProbability += ( *iChannel )->getProbability(); |
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| 278 | } |
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| 279 | } // Treatment of physically acceptable particle ends. |
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| 280 | } // End of evaporation cycle. |
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| 281 | |
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| 282 | // Gamma de-excitation. |
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| 283 | G4BEGammaDeexcitation *pGammaChannel = new G4BEGammaDeexcitation; |
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| 284 | pGammaChannel->setNucleusA( nucleusA ); |
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| 285 | pGammaChannel->setNucleusZ( nucleusZ ); |
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| 286 | pGammaChannel->setVerboseLevel( verboseLevel ); |
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| 287 | pGammaChannel->setExcitationEnergy( excE ); |
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| 288 | |
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| 289 | // Emit equally sampled photons until all the excitation energy is |
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| 290 | // used; the last photon gets the remaining de-excitation energy. |
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| 291 | // Change of momentum of the nucleus is neglected. |
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| 292 | G4double gammaEnergy; |
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| 293 | G4double totalDeExcEnergy = 0; |
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| 294 | |
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| 295 | while ( excE > 0 ) |
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| 296 | { |
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| 297 | pEmittedParticle = pGammaChannel->emit(); |
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| 298 | gammaEnergy = pEmittedParticle->GetKineticEnergy(); |
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| 299 | |
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| 300 | if ( ( totalDeExcEnergy + gammaEnergy ) > excE ) |
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| 301 | { |
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| 302 | // All the remaining energy is used here. |
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| 303 | gammaEnergy = excE - totalDeExcEnergy; |
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| 304 | excE = 0; |
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| 305 | } |
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| 306 | |
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| 307 | totalDeExcEnergy += gammaEnergy; |
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| 308 | |
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| 309 | if ( verboseLevel >= 10 ) |
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| 310 | G4cout << " G4BertiniEvaporation : gamma de-excitation, g of " << gammaEnergy << " MeV " << G4endl; |
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| 311 | |
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| 312 | G4LorentzVector gammaFourVector( pEmittedParticle->GetMomentum(), |
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| 313 | pEmittedParticle->GetKineticEnergy() ); |
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| 314 | gammaFourVector.boost( boostToLab ); |
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| 315 | pEmittedParticle->SetKineticEnergy( gammaFourVector.e() ); |
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| 316 | pEmittedParticle->SetMomentumDirection( gammaFourVector.vect().unit() ); |
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| 317 | |
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| 318 | secondaryParticleVector.push_back( pEmittedParticle ); |
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| 319 | |
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| 320 | } |
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| 321 | |
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| 322 | delete pGammaChannel; |
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| 323 | |
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| 324 | // Residual nucleus is not returned. |
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| 325 | |
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| 326 | fillResult( secondaryParticleVector, result); |
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| 327 | |
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| 328 | return result; |
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| 329 | } |
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| 330 | |
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| 331 | |
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| 332 | void G4BertiniEvaporation::splitBe8( const G4double E, |
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| 333 | const G4ThreeVector boostToLab, |
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| 334 | std::vector< G4DynamicParticle * > & secondaryParticleVector ) |
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| 335 | { |
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| 336 | G4double kineticEnergy; |
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| 337 | G4double u; |
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| 338 | G4double v; |
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| 339 | G4double w; |
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| 340 | const G4double Be8DecayEnergy = 0.093 * MeV; |
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| 341 | |
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| 342 | if ( E <= 0 ) throw G4HadronicException(__FILE__, __LINE__, "G4BertiniEvaporation : excitation energy < 0 " ); |
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| 343 | if ( verboseLevel >= 4 ) G4cout << " Be8 split to 2 x He4" << G4endl; |
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| 344 | |
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| 345 | kineticEnergy = 0.5 * ( E + Be8DecayEnergy ); |
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| 346 | |
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| 347 | // Create two alpha particles in CMS frame. |
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| 348 | isotropicCosines( u , v , w ); |
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| 349 | G4ThreeVector momentumDirectionCMS( u, v, w ); |
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| 350 | |
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| 351 | G4DynamicParticle *pP1Cms = new G4DynamicParticle( G4Alpha::Alpha(), |
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| 352 | momentumDirectionCMS, |
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| 353 | kineticEnergy ); |
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| 354 | G4DynamicParticle *pP2Cms = new G4DynamicParticle( G4Alpha::Alpha(), |
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| 355 | -momentumDirectionCMS, |
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| 356 | kineticEnergy ); |
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| 357 | G4LorentzVector fourVector1( pP1Cms->GetMomentum(), |
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| 358 | pP1Cms->GetTotalEnergy() ); |
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| 359 | G4LorentzVector fourVector2( pP2Cms->GetMomentum(), |
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| 360 | pP2Cms->GetTotalEnergy() ); |
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| 361 | |
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| 362 | // Transform into lab frame by transforming the four vectors. Then |
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| 363 | // add to the vector of secondary particles. |
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| 364 | fourVector1.boost( boostToLab ); |
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| 365 | fourVector2.boost( boostToLab ); |
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| 366 | G4DynamicParticle * pP1Lab = new G4DynamicParticle( G4Alpha::Alpha(), |
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| 367 | fourVector1.vect(), |
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| 368 | fourVector1.e() ); |
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| 369 | G4DynamicParticle * pP2Lab = new G4DynamicParticle( G4Alpha::Alpha(), |
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| 370 | fourVector2.vect(), |
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| 371 | fourVector2.e() ); |
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| 372 | secondaryParticleVector.push_back( pP1Lab ); |
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| 373 | secondaryParticleVector.push_back( pP2Lab ); |
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| 374 | |
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| 375 | delete pP1Cms; |
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| 376 | delete pP2Cms; |
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| 377 | |
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| 378 | return; |
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| 379 | } |
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| 380 | |
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| 381 | |
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| 382 | void G4BertiniEvaporation::fillResult( std::vector<G4DynamicParticle *> secondaryParticleVector, |
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| 383 | G4FragmentVector * aResult ) |
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| 384 | { |
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| 385 | // Fill the vector pParticleChange with secondary particles stored in vector. |
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| 386 | for ( size_t i = 0 ; i < secondaryParticleVector.size() ; i++ ) |
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| 387 | { |
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| 388 | G4int aZ = static_cast<G4int> (secondaryParticleVector[i]->GetDefinition()->GetPDGCharge() ); |
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| 389 | G4int aA = static_cast<G4int> (secondaryParticleVector[i]->GetDefinition()->GetBaryonNumber()); |
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| 390 | G4LorentzVector aMomentum = secondaryParticleVector[i]->Get4Momentum(); |
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| 391 | if(aA>0) |
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| 392 | { |
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| 393 | aResult->push_back( new G4Fragment(aA, aZ, aMomentum) ); |
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| 394 | } |
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| 395 | else |
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| 396 | { |
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| 397 | aResult->push_back( new G4Fragment(aMomentum, secondaryParticleVector[i]->GetDefinition()) ); |
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| 398 | } |
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| 399 | } |
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| 400 | return; |
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| 401 | } |
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| 402 | |
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| 403 | |
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| 404 | void G4BertiniEvaporation::isotropicCosines( G4double & u, G4double & v, G4double & w ) |
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| 405 | { |
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| 406 | // Samples isotropic random direction cosines. |
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| 407 | G4double CosTheta = 1.0 - 2.0 * G4UniformRand(); |
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| 408 | G4double SinTheta = std::sqrt( 1.0 - CosTheta * CosTheta ); |
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| 409 | G4double Phi = twopi * G4UniformRand(); |
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| 410 | |
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| 411 | u = std::cos( Phi ) * SinTheta; |
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| 412 | v = std::cos( Phi ) * CosTheta, |
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| 413 | w = std::sin( Phi ); |
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| 414 | |
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| 415 | return; |
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| 416 | } |
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