[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 | // $Id: G4UHadronElasticProcess.cc,v 1.35.2.1 2008/04/23 14:14:55 gcosmo Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 28 | // |
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| 29 | // Geant4 Hadron Elastic Scattering Process -- header file |
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| 30 | // |
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| 31 | // Created 21 April 2006 V.Ivanchenko |
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| 32 | // |
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| 33 | // Modified: |
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| 34 | // 24.04.06 V.Ivanchenko add neutron scattering on hydrogen from CHIPS |
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| 35 | // 07.06.06 V.Ivanchenko fix problem of rotation of final state |
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| 36 | // 25.07.06 V.Ivanchenko add 19 MeV low energy for CHIPS |
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| 37 | // 26.09.06 V.Ivanchenko add lowestEnergy |
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| 38 | // 20.10.06 V.Ivanchenko initialise lowestEnergy=0 for neitrals, eV for charged |
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| 39 | // 23.01.07 V.Ivanchnko add cross section interfaces with Z and A |
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| 40 | // 02.05.07 V.Ivanchnko add He3 |
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| 41 | // |
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| 42 | |
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| 43 | #include "G4UHadronElasticProcess.hh" |
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| 44 | #include "globals.hh" |
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| 45 | #include "G4CrossSectionDataStore.hh" |
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| 46 | #include "G4HadronElasticDataSet.hh" |
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| 47 | #include "G4VQCrossSection.hh" |
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| 48 | #include "G4QElasticCrossSection.hh" |
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| 49 | #include "G4QCHIPSWorld.hh" |
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| 50 | #include "G4Element.hh" |
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| 51 | #include "G4ElementVector.hh" |
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| 52 | #include "G4IsotopeVector.hh" |
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| 53 | #include "G4Neutron.hh" |
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| 54 | #include "G4Proton.hh" |
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| 55 | #include "G4HadronElastic.hh" |
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| 56 | |
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| 57 | G4UHadronElasticProcess::G4UHadronElasticProcess(const G4String& pName, G4double) |
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| 58 | : G4HadronicProcess(pName), lowestEnergy(0.0), first(true) |
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| 59 | { |
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| 60 | AddDataSet(new G4HadronElasticDataSet); |
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| 61 | theProton = G4Proton::Proton(); |
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| 62 | theNeutron = G4Neutron::Neutron(); |
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| 63 | thEnergy = 19.0*MeV; |
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| 64 | verboseLevel= 1; |
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| 65 | qCManager = 0; |
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| 66 | } |
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| 67 | |
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| 68 | G4UHadronElasticProcess::~G4UHadronElasticProcess() |
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| 69 | { |
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| 70 | } |
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| 71 | |
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| 72 | void G4UHadronElasticProcess::SetQElasticCrossSection(G4VQCrossSection* p) |
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| 73 | { |
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| 74 | qCManager = p; |
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| 75 | } |
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| 76 | |
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| 77 | void G4UHadronElasticProcess:: |
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| 78 | BuildPhysicsTable(const G4ParticleDefinition& aParticleType) |
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| 79 | { |
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| 80 | if(first) { |
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| 81 | first = false; |
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| 82 | if(!qCManager) qCManager = G4QElasticCrossSection::GetPointer(); |
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| 83 | theParticle = &aParticleType; |
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| 84 | pPDG = theParticle->GetPDGEncoding(); |
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| 85 | |
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| 86 | store = G4HadronicProcess::GetCrossSectionDataStore(); |
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| 87 | |
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| 88 | // defined lowest threshold for the projectile |
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| 89 | if(theParticle->GetPDGCharge() != 0.0) lowestEnergy = eV; |
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| 90 | |
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| 91 | if(verboseLevel>1 || |
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| 92 | (verboseLevel==1 && theParticle == theNeutron)) { |
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| 93 | G4cout << G4endl; |
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| 94 | G4cout << "G4UHadronElasticProcess for " |
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| 95 | << theParticle->GetParticleName() |
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| 96 | << " PDGcode= " << pPDG |
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| 97 | << " Elow(MeV)= " << thEnergy/MeV |
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| 98 | << " Elowest(eV)= " << lowestEnergy/eV |
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| 99 | << G4endl; |
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| 100 | } |
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| 101 | } |
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| 102 | store->BuildPhysicsTable(aParticleType); |
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| 103 | } |
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| 104 | |
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| 105 | G4double G4UHadronElasticProcess::GetMeanFreePath(const G4Track& track, |
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| 106 | G4double, |
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| 107 | G4ForceCondition* cond) |
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| 108 | { |
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| 109 | *cond = NotForced; |
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| 110 | const G4DynamicParticle* dp = track.GetDynamicParticle(); |
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| 111 | cross = 0.0; |
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| 112 | G4double x = DBL_MAX; |
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| 113 | |
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| 114 | // Compute cross sesctions |
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| 115 | const G4Material* material = track.GetMaterial(); |
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| 116 | const G4ElementVector* theElementVector = material->GetElementVector(); |
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| 117 | const G4double* theAtomNumDensityVector = material->GetVecNbOfAtomsPerVolume(); |
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| 118 | G4double temp = material->GetTemperature(); |
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| 119 | G4int nelm = material->GetNumberOfElements(); |
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| 120 | |
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| 121 | #ifdef G4VERBOSE |
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| 122 | if(verboseLevel>1) |
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| 123 | G4cout << "G4UHadronElasticProcess get mfp for " |
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| 124 | << theParticle->GetParticleName() |
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| 125 | << " p(GeV)= " << dp->GetTotalMomentum()/GeV |
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| 126 | << " in " << material->GetName() |
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| 127 | << G4endl; |
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| 128 | #endif |
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| 129 | |
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| 130 | for (G4int i=0; i<nelm; i++) { |
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| 131 | const G4Element* elm = (*theElementVector)[i]; |
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| 132 | G4double x = GetMicroscopicCrossSection(dp, elm, temp); |
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| 133 | cross += theAtomNumDensityVector[i]*x; |
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| 134 | xsec[i] = cross; |
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| 135 | } |
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| 136 | |
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| 137 | #ifdef G4VERBOSE |
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| 138 | if(verboseLevel>1) |
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| 139 | G4cout << "G4UHadronElasticProcess cross(1/mm)= " << cross |
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| 140 | << " E(MeV)= " << dp->GetKineticEnergy() |
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| 141 | << " " << theParticle->GetParticleName() |
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| 142 | << " in " << material->GetName() |
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| 143 | << G4endl; |
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| 144 | #endif |
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| 145 | |
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| 146 | if(cross > DBL_MIN) x = 1./cross; |
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| 147 | return x; |
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| 148 | } |
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| 149 | |
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| 150 | G4double G4UHadronElasticProcess::GetMicroscopicCrossSection( |
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| 151 | const G4DynamicParticle* dp, |
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| 152 | const G4Element* elm, |
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| 153 | G4double temp) |
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| 154 | { |
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| 155 | // gives the microscopic cross section in GEANT4 internal units |
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| 156 | G4int iz = G4int(elm->GetZ()); |
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| 157 | G4double x = 0.0; |
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| 158 | |
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| 159 | // CHIPS cross sections |
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| 160 | if(iz <= 2 && dp->GetKineticEnergy() > thEnergy && |
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| 161 | (theParticle == theProton || theParticle == theNeutron)) { |
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| 162 | |
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| 163 | G4double momentum = dp->GetTotalMomentum(); |
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| 164 | G4IsotopeVector* isv = elm->GetIsotopeVector(); |
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| 165 | G4int ni = 0; |
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| 166 | if(isv) ni = isv->size(); |
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| 167 | |
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| 168 | x = 0.0; |
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| 169 | if(ni == 0) { |
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| 170 | G4int N = G4int(elm->GetN()+0.5) - iz; |
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| 171 | x = qCManager->GetCrossSection(false,momentum,iz,N,pPDG); |
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| 172 | xsecH[0] = x; |
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| 173 | #ifdef G4VERBOSE |
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| 174 | if(verboseLevel>1) |
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| 175 | G4cout << "G4UHadronElasticProcess compute CHIPS CS for Z= " << iz |
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| 176 | << " N= " << N << " pdg= " << pPDG |
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| 177 | << " mom(GeV)= " << momentum/GeV |
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| 178 | << " " << qCManager << G4endl; |
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| 179 | #endif |
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| 180 | } else { |
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| 181 | G4double* ab = elm->GetRelativeAbundanceVector(); |
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| 182 | for(G4int j=0; j<ni; j++) { |
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| 183 | G4int N = (*isv)[j]->GetN() - iz; |
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| 184 | if(iz == 1) { |
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| 185 | if(N > 1) N = 1; |
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| 186 | } else { |
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| 187 | N = 2; |
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| 188 | } |
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| 189 | #ifdef G4VERBOSE |
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| 190 | if(verboseLevel>1) |
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| 191 | G4cout << "G4UHadronElasticProcess compute CHIPS CS for Z= " << iz |
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| 192 | << " N= " << N << " pdg= " << pPDG |
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| 193 | << " mom(GeV)= " << momentum/GeV |
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| 194 | << " " << qCManager << G4endl; |
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| 195 | #endif |
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| 196 | G4double y = ab[j]*qCManager->GetCrossSection(false,momentum,iz,N,pPDG); |
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| 197 | x += y; |
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| 198 | xsecH[j] = x; |
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| 199 | } |
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| 200 | } |
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| 201 | |
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| 202 | // GHAD cross section |
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| 203 | } else { |
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| 204 | #ifdef G4VERBOSE |
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| 205 | if(verboseLevel>1) |
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| 206 | G4cout << "G4UHadronElasticProcess compute GHAD CS for element " |
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| 207 | << elm->GetName() |
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| 208 | << G4endl; |
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| 209 | #endif |
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| 210 | x = store->GetCrossSection(dp, elm, temp); |
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| 211 | } |
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| 212 | // NaN finder |
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| 213 | if(!(x < 0.0 || x >= 0.0)) { |
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| 214 | if (verboseLevel > 1) { |
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| 215 | G4cout << "G4UHadronElasticProcess:WARNING: Z= " << iz |
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| 216 | << " pdg= " << pPDG |
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| 217 | << " mom(GeV)= " << dp->GetTotalMomentum()/GeV |
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| 218 | << " cross= " << x |
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| 219 | << " set to zero" |
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| 220 | << G4endl; |
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| 221 | } |
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| 222 | x = 0.0; |
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| 223 | } |
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| 224 | |
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| 225 | #ifdef G4VERBOSE |
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| 226 | if(verboseLevel>1) |
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| 227 | G4cout << "G4UHadronElasticProcess cross(mb)= " << x/millibarn |
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| 228 | << " E(MeV)= " << dp->GetKineticEnergy() |
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| 229 | << " " << theParticle->GetParticleName() |
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| 230 | << " in Z= " << iz |
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| 231 | << G4endl; |
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| 232 | #endif |
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| 233 | |
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| 234 | return x; |
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| 235 | } |
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| 236 | |
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| 237 | G4VParticleChange* G4UHadronElasticProcess::PostStepDoIt( |
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| 238 | const G4Track& track, |
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| 239 | const G4Step& step) |
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| 240 | { |
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| 241 | G4ForceCondition cn; |
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| 242 | aParticleChange.Initialize(track); |
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| 243 | G4double kineticEnergy = track.GetKineticEnergy(); |
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| 244 | if(kineticEnergy <= lowestEnergy) |
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| 245 | return G4VDiscreteProcess::PostStepDoIt(track,step); |
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| 246 | |
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| 247 | G4double mfp = GetMeanFreePath(track, 0.0, &cn); |
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| 248 | if(mfp == DBL_MAX) |
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| 249 | return G4VDiscreteProcess::PostStepDoIt(track,step); |
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| 250 | |
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| 251 | G4Material* material = track.GetMaterial(); |
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| 252 | |
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| 253 | // Select element |
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| 254 | const G4ElementVector* theElementVector = material->GetElementVector(); |
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| 255 | G4Element* elm = (*theElementVector)[0]; |
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| 256 | G4int nelm = material->GetNumberOfElements() - 1; |
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| 257 | if (nelm > 0) { |
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| 258 | G4double x = G4UniformRand()*cross; |
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| 259 | G4int i = -1; |
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| 260 | do {i++;} while (x > xsec[i] && i < nelm); |
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| 261 | elm = (*theElementVector)[i]; |
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| 262 | } |
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| 263 | G4double Z = elm->GetZ(); |
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| 264 | G4double A = G4double(G4int(elm->GetN()+0.5)); |
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| 265 | G4int iz = G4int(Z); |
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| 266 | |
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| 267 | // Select isotope |
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| 268 | G4IsotopeVector* isv = elm->GetIsotopeVector(); |
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| 269 | G4int ni = 0; |
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| 270 | if(isv) ni = isv->size(); |
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| 271 | |
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| 272 | if(ni == 1) { |
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| 273 | A = G4double((*isv)[0]->GetN()); |
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| 274 | } else if(ni > 1) { |
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| 275 | |
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| 276 | G4double* ab = elm->GetRelativeAbundanceVector(); |
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| 277 | G4int j = -1; |
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| 278 | ni--; |
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| 279 | // Special treatment of hydrogen and helium for CHIPS |
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| 280 | if(iz <= 2 && kineticEnergy > thEnergy && |
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| 281 | (theParticle == theProton || theParticle == theNeutron)) { |
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| 282 | G4double x = G4UniformRand()*xsecH[ni]; |
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| 283 | do {j++;} while (x > xsecH[j] && j < ni); |
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| 284 | |
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| 285 | // GHAD cross sections |
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| 286 | } else { |
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| 287 | G4double y = G4UniformRand(); |
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| 288 | do { |
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| 289 | j++; |
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| 290 | y -= ab[j]; |
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| 291 | } while (y > 0.0 && j < ni); |
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| 292 | } |
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| 293 | A = G4double((*isv)[j]->GetN()); |
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| 294 | } |
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| 295 | |
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| 296 | G4HadronicInteraction* hadi = |
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| 297 | ChooseHadronicInteraction( kineticEnergy, material, elm); |
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| 298 | |
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| 299 | // Initialize the hadronic projectile from the track |
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| 300 | // G4cout << "track " << track.GetDynamicParticle()->Get4Momentum()<<G4endl; |
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| 301 | G4HadProjectile thePro(track); |
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| 302 | if(verboseLevel>1) |
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| 303 | G4cout << "G4UHadronElasticProcess::PostStepDoIt for " |
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| 304 | << theParticle->GetParticleName() |
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| 305 | << " Target Z= " << Z |
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| 306 | << " A= " << A << G4endl; |
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| 307 | targetNucleus.SetParameters(A, Z); |
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| 308 | |
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| 309 | aParticleChange.Initialize(track); |
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| 310 | G4HadFinalState* result = hadi->ApplyYourself(thePro, targetNucleus); |
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| 311 | G4ThreeVector indir = track.GetMomentumDirection(); |
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| 312 | G4ThreeVector outdir = (result->GetMomentumChange()).rotateUz(indir); |
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| 313 | |
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| 314 | if(verboseLevel>1) |
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| 315 | G4cout << "Efin= " << result->GetEnergyChange() |
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| 316 | << " de= " << result->GetLocalEnergyDeposit() |
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| 317 | << " nsec= " << result->GetNumberOfSecondaries() |
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| 318 | << " dir= " << outdir |
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| 319 | << G4endl; |
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| 320 | |
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| 321 | aParticleChange.ProposeEnergy(result->GetEnergyChange()); |
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| 322 | aParticleChange.ProposeMomentumDirection(outdir); |
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| 323 | if(result->GetNumberOfSecondaries() > 0) { |
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| 324 | aParticleChange.SetNumberOfSecondaries(1); |
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| 325 | G4DynamicParticle* p = result->GetSecondary(0)->GetParticle(); |
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| 326 | G4ThreeVector pdir = p->GetMomentumDirection(); |
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| 327 | // G4cout << "recoil " << pdir << G4endl; |
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| 328 | pdir = pdir.rotateUz(indir); |
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| 329 | // G4cout << "recoil rotated " << pdir << G4endl; |
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| 330 | p->SetMomentumDirection(pdir); |
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| 331 | aParticleChange.AddSecondary(p); |
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| 332 | } else { |
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| 333 | aParticleChange.SetNumberOfSecondaries(0); |
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| 334 | aParticleChange.ProposeLocalEnergyDeposit(result->GetLocalEnergyDeposit()); |
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| 335 | } |
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| 336 | result->Clear(); |
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| 337 | |
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| 338 | return G4VDiscreteProcess::PostStepDoIt(track,step); |
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| 339 | } |
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| 340 | |
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| 341 | G4bool G4UHadronElasticProcess:: |
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| 342 | IsApplicable(const G4ParticleDefinition& aParticleType) |
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| 343 | { |
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| 344 | return (aParticleType == *(G4PionPlus::PionPlus()) || |
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| 345 | aParticleType == *(G4PionMinus::PionMinus()) || |
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| 346 | aParticleType == *(G4KaonPlus::KaonPlus()) || |
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| 347 | aParticleType == *(G4KaonZeroShort::KaonZeroShort()) || |
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| 348 | aParticleType == *(G4KaonZeroLong::KaonZeroLong()) || |
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| 349 | aParticleType == *(G4KaonMinus::KaonMinus()) || |
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| 350 | aParticleType == *(G4Proton::Proton()) || |
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| 351 | aParticleType == *(G4AntiProton::AntiProton()) || |
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| 352 | aParticleType == *(G4Neutron::Neutron()) || |
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| 353 | aParticleType == *(G4AntiNeutron::AntiNeutron()) || |
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| 354 | aParticleType == *(G4Lambda::Lambda()) || |
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| 355 | aParticleType == *(G4AntiLambda::AntiLambda()) || |
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| 356 | aParticleType == *(G4SigmaPlus::SigmaPlus()) || |
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| 357 | aParticleType == *(G4SigmaZero::SigmaZero()) || |
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| 358 | aParticleType == *(G4SigmaMinus::SigmaMinus()) || |
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| 359 | aParticleType == *(G4AntiSigmaPlus::AntiSigmaPlus()) || |
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| 360 | aParticleType == *(G4AntiSigmaZero::AntiSigmaZero()) || |
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| 361 | aParticleType == *(G4AntiSigmaMinus::AntiSigmaMinus()) || |
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| 362 | aParticleType == *(G4XiZero::XiZero()) || |
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| 363 | aParticleType == *(G4XiMinus::XiMinus()) || |
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| 364 | aParticleType == *(G4AntiXiZero::AntiXiZero()) || |
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| 365 | aParticleType == *(G4AntiXiMinus::AntiXiMinus()) || |
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| 366 | aParticleType == *(G4Deuteron::Deuteron()) || |
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| 367 | aParticleType == *(G4Triton::Triton()) || |
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| 368 | aParticleType == *(G4He3::He3()) || |
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| 369 | aParticleType == *(G4Alpha::Alpha()) || |
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| 370 | aParticleType == *(G4OmegaMinus::OmegaMinus()) || |
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| 371 | aParticleType == *(G4AntiOmegaMinus::AntiOmegaMinus())); |
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| 372 | } |
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| 373 | |
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| 374 | void G4UHadronElasticProcess:: |
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| 375 | DumpPhysicsTable(const G4ParticleDefinition& aParticleType) |
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| 376 | { |
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| 377 | store->DumpPhysicsTable(aParticleType); |
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| 378 | } |
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| 379 | |
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