[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 | // neutron_hp -- source file |
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| 27 | // J.P. Wellisch, Nov-1996 |
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| 28 | // A prototype of the low energy neutron transport model. |
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| 29 | // |
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| 30 | // 12-April-06 Enable IC electron emissions T. Koi |
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| 31 | // 26-January-07 Add G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION flag |
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| 32 | // |
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| 33 | #include "G4NeutronHPCaptureFS.hh" |
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| 34 | #include "G4Gamma.hh" |
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| 35 | #include "G4ReactionProduct.hh" |
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| 36 | #include "G4Nucleus.hh" |
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| 37 | #include "G4PhotonEvaporation.hh" |
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| 38 | #include "G4Fragment.hh" |
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| 39 | #include "G4ParticleTable.hh" |
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| 40 | #include "G4NeutronHPDataUsed.hh" |
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| 41 | |
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| 42 | G4HadFinalState * G4NeutronHPCaptureFS::ApplyYourself(const G4HadProjectile & theTrack) |
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| 43 | { |
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| 44 | G4int i; |
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| 45 | theResult.Clear(); |
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| 46 | // prepare neutron |
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| 47 | G4double eKinetic = theTrack.GetKineticEnergy(); |
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| 48 | const G4HadProjectile *incidentParticle = &theTrack; |
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| 49 | G4ReactionProduct theNeutron( const_cast<G4ParticleDefinition *>(incidentParticle->GetDefinition()) ); |
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| 50 | theNeutron.SetMomentum( incidentParticle->Get4Momentum().vect() ); |
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| 51 | theNeutron.SetKineticEnergy( eKinetic ); |
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| 52 | |
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| 53 | // prepare target |
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| 54 | G4ReactionProduct theTarget; |
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| 55 | G4Nucleus aNucleus; |
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| 56 | G4double eps = 0.0001; |
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| 57 | if(targetMass<500*MeV) |
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| 58 | targetMass = ( G4NucleiPropertiesTable::GetNuclearMass(static_cast<G4int>(theBaseZ+eps), static_cast<G4int>(theBaseA+eps))) / |
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| 59 | G4Neutron::Neutron()->GetPDGMass(); |
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| 60 | G4ThreeVector neutronVelocity = 1./G4Neutron::Neutron()->GetPDGMass()*theNeutron.GetMomentum(); |
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| 61 | G4double temperature = theTrack.GetMaterial()->GetTemperature(); |
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| 62 | theTarget = aNucleus.GetBiasedThermalNucleus(targetMass, neutronVelocity, temperature); |
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| 63 | |
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| 64 | // go to nucleus rest system |
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| 65 | theNeutron.Lorentz(theNeutron, -1*theTarget); |
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| 66 | eKinetic = theNeutron.GetKineticEnergy(); |
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| 67 | |
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| 68 | // dice the photons |
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| 69 | |
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| 70 | G4ReactionProductVector * thePhotons = 0; |
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| 71 | if ( HasFSData() && !getenv ( "G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION" ) ) |
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| 72 | { |
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| 73 | thePhotons = theFinalStatePhotons.GetPhotons(eKinetic); |
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| 74 | } |
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| 75 | else |
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| 76 | { |
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| 77 | G4ThreeVector aCMSMomentum = theNeutron.GetMomentum()+theTarget.GetMomentum(); |
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| 78 | G4LorentzVector p4(aCMSMomentum, theTarget.GetTotalEnergy() + theNeutron.GetTotalEnergy()); |
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| 79 | G4Fragment nucleus(static_cast<G4int>(theBaseA+1), static_cast<G4int>(theBaseZ) ,p4); |
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| 80 | G4PhotonEvaporation photonEvaporation; |
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| 81 | // T. K. add |
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| 82 | photonEvaporation.SetICM( TRUE ); |
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| 83 | G4FragmentVector* products = photonEvaporation.BreakItUp(nucleus); |
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| 84 | G4FragmentVector::iterator i; |
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| 85 | thePhotons = new G4ReactionProductVector; |
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| 86 | for(i=products->begin(); i!=products->end(); i++) |
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| 87 | { |
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| 88 | G4ReactionProduct * theOne = new G4ReactionProduct; |
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| 89 | // T. K. add |
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| 90 | if ( (*i)->GetParticleDefinition() != 0 ) |
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| 91 | theOne->SetDefinition( (*i)->GetParticleDefinition() ); |
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| 92 | else |
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| 93 | theOne->SetDefinition( G4Gamma::Gamma() ); // this definiion will be over writen |
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| 94 | |
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| 95 | // T. K. comment out below line |
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| 96 | //theOne->SetDefinition( G4Gamma::Gamma() ); |
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| 97 | G4ParticleTable* theTable = G4ParticleTable::GetParticleTable(); |
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| 98 | if((*i)->GetMomentum().mag() > 10*MeV) |
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| 99 | theOne->SetDefinition( |
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| 100 | theTable->FindIon(static_cast<G4int>(theBaseZ), static_cast<G4int>(theBaseA+1), 0, static_cast<G4int>(theBaseZ)) ); |
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| 101 | theOne->SetMomentum( (*i)->GetMomentum().vect() ) ; |
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| 102 | theOne->SetTotalEnergy( (*i)->GetMomentum().t() ); |
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| 103 | thePhotons->push_back(theOne); |
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| 104 | delete *i; |
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| 105 | } |
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| 106 | delete products; |
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| 107 | } |
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| 108 | |
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| 109 | // add them to the final state |
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| 110 | |
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| 111 | G4int nPhotons = 0; |
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| 112 | if(thePhotons!=0) nPhotons=thePhotons->size(); |
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| 113 | G4int nParticles = nPhotons; |
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| 114 | if(1==nPhotons) nParticles = 2; |
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| 115 | |
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| 116 | // back to lab system |
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| 117 | for(i=0; i<nPhotons; i++) |
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| 118 | { |
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| 119 | thePhotons->operator[](i)->Lorentz(*(thePhotons->operator[](i)), theTarget); |
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| 120 | } |
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| 121 | |
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| 122 | // Recoil, if only one gamma |
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| 123 | if (1==nPhotons) |
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| 124 | { |
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| 125 | G4DynamicParticle * theOne = new G4DynamicParticle; |
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| 126 | G4ParticleDefinition * aRecoil = G4ParticleTable::GetParticleTable() |
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| 127 | ->FindIon(static_cast<G4int>(theBaseZ), static_cast<G4int>(theBaseA+1), 0, static_cast<G4int>(theBaseZ)); |
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| 128 | theOne->SetDefinition(aRecoil); |
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| 129 | // Now energy; |
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| 130 | // Can be done slightly better @ |
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| 131 | G4ThreeVector aMomentum = theTrack.Get4Momentum().vect() |
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| 132 | +theTarget.GetMomentum() |
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| 133 | -thePhotons->operator[](0)->GetMomentum(); |
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| 134 | |
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| 135 | G4ThreeVector theMomUnit = aMomentum.unit(); |
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| 136 | G4double aKinEnergy = theTrack.GetKineticEnergy() |
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| 137 | +theTarget.GetKineticEnergy(); // gammas come from Q-value |
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| 138 | G4double theResMass = aRecoil->GetPDGMass(); |
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| 139 | G4double theResE = aRecoil->GetPDGMass()+aKinEnergy; |
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| 140 | G4double theAbsMom = std::sqrt(theResE*theResE - theResMass*theResMass); |
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| 141 | G4ThreeVector theMomentum = theAbsMom*theMomUnit; |
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| 142 | theOne->SetMomentum(theMomentum); |
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| 143 | theResult.AddSecondary(theOne); |
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| 144 | } |
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| 145 | |
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| 146 | // Now fill in the gammas. |
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| 147 | for(i=0; i<nPhotons; i++) |
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| 148 | { |
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| 149 | // back to lab system |
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| 150 | G4DynamicParticle * theOne = new G4DynamicParticle; |
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| 151 | theOne->SetDefinition(thePhotons->operator[](i)->GetDefinition()); |
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| 152 | theOne->SetMomentum(thePhotons->operator[](i)->GetMomentum()); |
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| 153 | theResult.AddSecondary(theOne); |
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| 154 | delete thePhotons->operator[](i); |
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| 155 | } |
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| 156 | delete thePhotons; |
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| 157 | // clean up the primary neutron |
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| 158 | theResult.SetStatusChange(stopAndKill); |
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| 159 | return &theResult; |
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| 160 | } |
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| 161 | |
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| 162 | void G4NeutronHPCaptureFS::Init (G4double A, G4double Z, G4String & dirName, G4String & ) |
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| 163 | { |
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| 164 | G4String tString = "/FS/"; |
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| 165 | G4bool dbool; |
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| 166 | G4NeutronHPDataUsed aFile = theNames.GetName(static_cast<G4int>(A), static_cast<G4int>(Z), dirName, tString, dbool); |
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| 167 | G4String filename = aFile.GetName(); |
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| 168 | theBaseA = A; |
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| 169 | theBaseZ = G4int(Z+.5); |
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| 170 | if(!dbool || ( Z<2.5 && ( std::abs(theBaseZ - Z)>0.0001 || std::abs(theBaseA - A)>0.0001))) |
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| 171 | { |
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| 172 | hasAnyData = false; |
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| 173 | hasFSData = false; |
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| 174 | hasXsec = false; |
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| 175 | return; |
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| 176 | } |
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| 177 | std::ifstream theData(filename, std::ios::in); |
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| 178 | |
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| 179 | hasFSData = theFinalStatePhotons.InitMean(theData); |
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| 180 | if(hasFSData) |
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| 181 | { |
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| 182 | targetMass = theFinalStatePhotons.GetTargetMass(); |
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| 183 | theFinalStatePhotons.InitAngular(theData); |
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| 184 | theFinalStatePhotons.InitEnergies(theData); |
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| 185 | } |
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| 186 | theData.close(); |
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| 187 | } |
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