[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 | // $Id: G4Decay.cc,v 1.27.2.1 2008/04/17 08:59:24 kurasige Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 29 | // |
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| 30 | // |
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| 31 | // -------------------------------------------------------------- |
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| 32 | // GEANT 4 class implementation file |
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| 33 | // |
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| 34 | // History: first implementation, based on object model of |
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| 35 | // 2nd December 1995, G.Cosmo |
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| 36 | // 7 July 1996 H.Kurashige |
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| 37 | // ------------------------------------------------------------ |
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| 38 | // remove BuildPhysicsTable() 28 Nov. 1997 H.Kurashige |
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| 39 | // change DBL_EPSIRON to DBL_MIN 14 Dec. 1997 H.Kurashige |
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| 40 | // modified for new ParticleChange 12 Mar. 1998 H.Kurashige |
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| 41 | // modified for "GoodForTrackingFlag" 19 June 1998 H.Kurashige |
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| 42 | // rename thePhysicsTable to aPhyscisTable 2 Aug. 1998 H.Kurashige |
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| 43 | // modified IsApplicable in order to protect the decay from registered |
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| 44 | // to resonances 12 Dec. 1998 H.Kurashige |
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| 45 | // remove G4ParticleMomentum 6 Feb. 99 H.Kurashige |
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| 46 | // modified IsApplicable to activate G4Decay for resonances 1 Mar. 00 H.Kurashige |
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| 47 | // Add External Decayer 23 Feb. 2001 H.Kurashige |
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| 48 | // change LowestBinValue,HighestBinValue and TotBin(200) 9 Feb. 2002 |
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| 49 | // |
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| 50 | |
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| 51 | #include "G4Decay.hh" |
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| 52 | #include "G4DynamicParticle.hh" |
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| 53 | #include "G4DecayProducts.hh" |
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| 54 | #include "G4DecayTable.hh" |
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| 55 | #include "G4PhysicsLogVector.hh" |
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| 56 | #include "G4ParticleChangeForDecay.hh" |
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| 57 | #include "G4VExtDecayer.hh" |
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| 58 | |
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| 59 | // constructor |
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| 60 | G4Decay::G4Decay(const G4String& processName) |
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| 61 | :G4VRestDiscreteProcess(processName, fDecay), |
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| 62 | verboseLevel(1), |
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| 63 | HighestValue(20.0), |
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| 64 | pExtDecayer(0) |
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| 65 | { |
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| 66 | #ifdef G4VERBOSE |
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| 67 | if (GetVerboseLevel()>1) { |
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| 68 | G4cout << "G4Decay constructor " << " Name:" << processName << G4endl; |
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| 69 | } |
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| 70 | #endif |
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| 71 | pParticleChange = &fParticleChangeForDecay; |
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| 72 | } |
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| 73 | |
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| 74 | G4Decay::~G4Decay() |
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| 75 | { |
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| 76 | if (pExtDecayer) { |
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| 77 | delete pExtDecayer; |
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| 78 | } |
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| 79 | } |
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| 80 | |
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| 81 | G4bool G4Decay::IsApplicable(const G4ParticleDefinition& aParticleType) |
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| 82 | { |
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| 83 | // check if the particle is stable? |
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| 84 | if (aParticleType.GetPDGLifeTime() <0.0) { |
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| 85 | return false; |
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| 86 | } else if (aParticleType.GetPDGMass() <= 0.0*MeV) { |
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| 87 | return false; |
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| 88 | } else { |
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| 89 | return true; |
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| 90 | } |
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| 91 | } |
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| 92 | |
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| 93 | G4double G4Decay::GetMeanLifeTime(const G4Track& aTrack , |
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| 94 | G4ForceCondition*) |
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| 95 | { |
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| 96 | // returns the mean free path in GEANT4 internal units |
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| 97 | G4double meanlife; |
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| 98 | |
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| 99 | // get particle |
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| 100 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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| 101 | G4ParticleDefinition* aParticleDef = aParticle->GetDefinition(); |
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| 102 | G4double aLife = aParticleDef->GetPDGLifeTime(); |
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| 103 | |
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| 104 | // check if the particle is stable? |
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| 105 | if (aParticleDef->GetPDGStable()) { |
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| 106 | meanlife = DBL_MAX; |
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| 107 | |
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| 108 | } else { |
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| 109 | meanlife = aLife; |
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| 110 | } |
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| 111 | |
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| 112 | #ifdef G4VERBOSE |
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| 113 | if (GetVerboseLevel()>1) { |
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| 114 | G4cout << "mean life time: "<< meanlife/ns << "[ns]" << G4endl; |
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| 115 | } |
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| 116 | #endif |
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| 117 | |
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| 118 | return meanlife; |
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| 119 | } |
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| 120 | |
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| 121 | G4double G4Decay::GetMeanFreePath(const G4Track& aTrack,G4double, G4ForceCondition*) |
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| 122 | { |
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| 123 | // get particle |
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| 124 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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| 125 | G4ParticleDefinition* aParticleDef = aParticle->GetDefinition(); |
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| 126 | G4double aMass = aParticle->GetMass(); |
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| 127 | G4double aLife = aParticleDef->GetPDGLifeTime(); |
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| 128 | |
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| 129 | |
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| 130 | // returns the mean free path in GEANT4 internal units |
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| 131 | G4double pathlength; |
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| 132 | G4double aCtau = c_light * aLife; |
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| 133 | |
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| 134 | // check if the particle is stable? |
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| 135 | if (aParticleDef->GetPDGStable()) { |
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| 136 | pathlength = DBL_MAX; |
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| 137 | |
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| 138 | //check if the particle has very short life time ? |
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| 139 | } else if (aCtau < DBL_MIN) { |
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| 140 | pathlength = DBL_MIN; |
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| 141 | |
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| 142 | } else { |
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| 143 | //calculate the mean free path |
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| 144 | // by using normalized kinetic energy (= Ekin/mass) |
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| 145 | G4double rKineticEnergy = aParticle->GetKineticEnergy()/aMass; |
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| 146 | if ( rKineticEnergy > HighestValue) { |
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| 147 | // gamma >> 1 |
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| 148 | pathlength = ( rKineticEnergy + 1.0)* aCtau; |
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| 149 | } else if ( rKineticEnergy < DBL_MIN ) { |
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| 150 | // too slow particle |
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| 151 | #ifdef G4VERBOSE |
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| 152 | if (GetVerboseLevel()>1) { |
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| 153 | G4cout << "G4Decay::GetMeanFreePath() !!particle stops!!"; |
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| 154 | G4cout << aParticleDef->GetParticleName() << G4endl; |
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| 155 | G4cout << "KineticEnergy:" << aParticle->GetKineticEnergy()/GeV <<"[GeV]"; |
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| 156 | } |
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| 157 | #endif |
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| 158 | pathlength = DBL_MIN; |
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| 159 | } else { |
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| 160 | // beta <1 |
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| 161 | pathlength = (aParticle->GetTotalMomentum())/aMass*aCtau ; |
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| 162 | } |
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| 163 | } |
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| 164 | return pathlength; |
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| 165 | } |
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| 166 | |
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| 167 | void G4Decay::BuildPhysicsTable(const G4ParticleDefinition&) |
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| 168 | { |
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| 169 | return; |
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| 170 | } |
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| 171 | |
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| 172 | G4VParticleChange* G4Decay::DecayIt(const G4Track& aTrack, const G4Step& ) |
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| 173 | { |
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| 174 | // The DecayIt() method returns by pointer a particle-change object. |
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| 175 | // Units are expressed in GEANT4 internal units. |
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| 176 | |
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| 177 | // Initialize ParticleChange |
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| 178 | // all members of G4VParticleChange are set to equal to |
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| 179 | // corresponding member in G4Track |
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| 180 | fParticleChangeForDecay.Initialize(aTrack); |
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| 181 | |
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| 182 | // get particle |
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| 183 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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| 184 | G4ParticleDefinition* aParticleDef = aParticle->GetDefinition(); |
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| 185 | |
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| 186 | // check if the particle is stable |
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| 187 | if (aParticleDef->GetPDGStable()) return &fParticleChangeForDecay ; |
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| 188 | |
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| 189 | |
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| 190 | //check if thePreAssignedDecayProducts exists |
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| 191 | const G4DecayProducts* o_products = (aParticle->GetPreAssignedDecayProducts()); |
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| 192 | G4bool isPreAssigned = (o_products != 0); |
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| 193 | G4DecayProducts* products = 0; |
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| 194 | |
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| 195 | // decay table |
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| 196 | G4DecayTable *decaytable = aParticleDef->GetDecayTable(); |
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| 197 | |
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| 198 | // check if external decayer exists |
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| 199 | G4bool isExtDecayer = (decaytable == 0) && (pExtDecayer !=0); |
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| 200 | |
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| 201 | // Error due to NO Decay Table |
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| 202 | if ( (decaytable == 0) && !isExtDecayer &&!isPreAssigned ){ |
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| 203 | if (GetVerboseLevel()>0) { |
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| 204 | G4cout << "G4Decay::DoIt : decay table not defined for "; |
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| 205 | G4cout << aParticle->GetDefinition()->GetParticleName()<< G4endl; |
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| 206 | } |
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| 207 | G4Exception( "G4Decay::DecayIt ", |
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| 208 | "No Decay Table",JustWarning, |
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| 209 | "Decay table is not defined"); |
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| 210 | |
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| 211 | fParticleChangeForDecay.SetNumberOfSecondaries(0); |
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| 212 | // Kill the parent particle |
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| 213 | fParticleChangeForDecay.ProposeTrackStatus( fStopAndKill ) ; |
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| 214 | fParticleChangeForDecay.ProposeLocalEnergyDeposit(0.0); |
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| 215 | |
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| 216 | ClearNumberOfInteractionLengthLeft(); |
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| 217 | return &fParticleChangeForDecay ; |
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| 218 | } |
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| 219 | |
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| 220 | if (isPreAssigned) { |
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| 221 | // copy decay products |
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| 222 | products = new G4DecayProducts(*o_products); |
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| 223 | } else if ( isExtDecayer ) { |
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| 224 | // decay according to external decayer |
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| 225 | products = pExtDecayer->ImportDecayProducts(aTrack); |
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| 226 | } else { |
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| 227 | // decay acoording to decay table |
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| 228 | // choose a decay channel |
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| 229 | G4VDecayChannel *decaychannel = decaytable->SelectADecayChannel(); |
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| 230 | if (decaychannel == 0 ){ |
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| 231 | // decay channel not found |
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| 232 | G4Exception("G4Decay::DoIt : can not determine decay channel "); |
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| 233 | } else { |
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| 234 | // execute DecayIt() |
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| 235 | #ifdef G4VERBOSE |
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| 236 | G4int temp = decaychannel->GetVerboseLevel(); |
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| 237 | if (GetVerboseLevel()>1) { |
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| 238 | G4cout << "G4Decay::DoIt : selected decay channel addr:" << decaychannel <<G4endl; |
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| 239 | decaychannel->SetVerboseLevel(GetVerboseLevel()); |
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| 240 | } |
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| 241 | #endif |
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| 242 | products = decaychannel->DecayIt(aParticle->GetMass()); |
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| 243 | #ifdef G4VERBOSE |
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| 244 | if (GetVerboseLevel()>1) { |
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| 245 | decaychannel->SetVerboseLevel(temp); |
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| 246 | } |
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| 247 | #endif |
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| 248 | #ifdef G4VERBOSE |
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| 249 | if (GetVerboseLevel()>2) { |
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| 250 | if (! products->IsChecked() ) products->DumpInfo(); |
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| 251 | } |
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| 252 | #endif |
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| 253 | } |
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| 254 | } |
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| 255 | |
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| 256 | // get parent particle information ................................... |
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| 257 | G4double ParentEnergy = aParticle->GetTotalEnergy(); |
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| 258 | G4double ParentMass = aParticle->GetMass(); |
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| 259 | if (ParentEnergy < ParentMass) { |
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| 260 | ParentEnergy = ParentMass; |
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| 261 | if (GetVerboseLevel()>0) { |
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| 262 | G4cout << "G4Decay::DoIt : Total Energy is less than its mass" << G4endl; |
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| 263 | G4cout << " Particle: " << aParticle->GetDefinition()->GetParticleName(); |
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| 264 | G4cout << " Energy:" << ParentEnergy/MeV << "[MeV]"; |
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| 265 | G4cout << " Mass:" << ParentMass/MeV << "[MeV]"; |
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| 266 | G4cout << G4endl; |
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| 267 | } |
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| 268 | } |
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| 269 | |
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| 270 | G4ThreeVector ParentDirection(aParticle->GetMomentumDirection()); |
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| 271 | |
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| 272 | //boost all decay products to laboratory frame |
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| 273 | G4double energyDeposit = 0.0; |
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| 274 | G4double finalGlobalTime = aTrack.GetGlobalTime(); |
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| 275 | if (aTrack.GetTrackStatus() == fStopButAlive ){ |
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| 276 | // AtRest case |
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| 277 | finalGlobalTime += fRemainderLifeTime; |
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| 278 | energyDeposit += aParticle->GetKineticEnergy(); |
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| 279 | if (isPreAssigned) products->Boost( ParentEnergy, ParentDirection); |
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| 280 | } else { |
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| 281 | // PostStep case |
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| 282 | if (!isExtDecayer) products->Boost( ParentEnergy, ParentDirection); |
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| 283 | } |
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| 284 | |
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| 285 | // set polarization for daughter particles |
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| 286 | DaughterPolarization(aTrack, products); |
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| 287 | |
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| 288 | |
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| 289 | //add products in fParticleChangeForDecay |
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| 290 | G4int numberOfSecondaries = products->entries(); |
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| 291 | fParticleChangeForDecay.SetNumberOfSecondaries(numberOfSecondaries); |
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| 292 | #ifdef G4VERBOSE |
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| 293 | if (GetVerboseLevel()>1) { |
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| 294 | G4cout << "G4Decay::DoIt : Decay vertex :"; |
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| 295 | G4cout << " Time: " << finalGlobalTime/ns << "[ns]"; |
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| 296 | G4cout << " X:" << (aTrack.GetPosition()).x() /cm << "[cm]"; |
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| 297 | G4cout << " Y:" << (aTrack.GetPosition()).y() /cm << "[cm]"; |
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| 298 | G4cout << " Z:" << (aTrack.GetPosition()).z() /cm << "[cm]"; |
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| 299 | G4cout << G4endl; |
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| 300 | G4cout << "G4Decay::DoIt : decay products in Lab. Frame" << G4endl; |
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| 301 | products->DumpInfo(); |
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| 302 | } |
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| 303 | #endif |
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| 304 | G4int index; |
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| 305 | G4ThreeVector currentPosition; |
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| 306 | const G4TouchableHandle thand = aTrack.GetTouchableHandle(); |
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| 307 | for (index=0; index < numberOfSecondaries; index++) |
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| 308 | { |
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| 309 | // get current position of the track |
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| 310 | currentPosition = aTrack.GetPosition(); |
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| 311 | // create a new track object |
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| 312 | G4Track* secondary = new G4Track( products->PopProducts(), |
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| 313 | finalGlobalTime , |
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| 314 | currentPosition ); |
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| 315 | // switch on good for tracking flag |
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| 316 | secondary->SetGoodForTrackingFlag(); |
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| 317 | secondary->SetTouchableHandle(thand); |
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| 318 | // add the secondary track in the List |
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| 319 | fParticleChangeForDecay.AddSecondary(secondary); |
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| 320 | } |
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| 321 | delete products; |
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| 322 | |
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| 323 | // Kill the parent particle |
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| 324 | fParticleChangeForDecay.ProposeTrackStatus( fStopAndKill ) ; |
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| 325 | fParticleChangeForDecay.ProposeLocalEnergyDeposit(energyDeposit); |
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| 326 | fParticleChangeForDecay.ProposeGlobalTime( finalGlobalTime ); |
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| 327 | // Clear NumberOfInteractionLengthLeft |
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| 328 | ClearNumberOfInteractionLengthLeft(); |
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| 329 | |
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| 330 | return &fParticleChangeForDecay ; |
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| 331 | } |
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| 332 | |
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| 333 | void G4Decay::DaughterPolarization(const G4Track& , G4DecayProducts* ) |
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| 334 | { |
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| 335 | } |
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| 336 | |
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| 337 | |
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| 338 | |
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| 339 | void G4Decay::StartTracking(G4Track*) |
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| 340 | { |
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| 341 | currentInteractionLength = -1.0; |
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| 342 | ResetNumberOfInteractionLengthLeft(); |
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| 343 | |
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| 344 | fRemainderLifeTime = -1.0; |
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| 345 | } |
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| 346 | |
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| 347 | void G4Decay::EndTracking() |
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| 348 | { |
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| 349 | // Clear NumberOfInteractionLengthLeft |
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| 350 | ClearNumberOfInteractionLengthLeft(); |
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| 351 | |
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| 352 | currentInteractionLength = -1.0; |
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| 353 | } |
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| 354 | |
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| 355 | |
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| 356 | G4double G4Decay::PostStepGetPhysicalInteractionLength( |
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| 357 | const G4Track& track, |
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| 358 | G4double previousStepSize, |
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| 359 | G4ForceCondition* condition |
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| 360 | ) |
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| 361 | { |
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| 362 | |
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| 363 | // condition is set to "Not Forced" |
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| 364 | *condition = NotForced; |
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| 365 | |
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| 366 | // pre-assigned Decay time |
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| 367 | G4double pTime = track.GetDynamicParticle()->GetPreAssignedDecayProperTime(); |
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| 368 | G4double aLife = track.GetDynamicParticle()->GetDefinition()->GetPDGLifeTime(); |
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| 369 | |
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| 370 | if (pTime < 0.) { |
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| 371 | // normal case |
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| 372 | if ( previousStepSize > 0.0){ |
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| 373 | // subtract NumberOfInteractionLengthLeft |
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| 374 | SubtractNumberOfInteractionLengthLeft(previousStepSize); |
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| 375 | if(theNumberOfInteractionLengthLeft<0.){ |
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| 376 | theNumberOfInteractionLengthLeft=perMillion; |
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| 377 | } |
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| 378 | fRemainderLifeTime = theNumberOfInteractionLengthLeft*aLife; |
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| 379 | } |
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| 380 | // get mean free path |
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| 381 | currentInteractionLength = GetMeanFreePath(track, previousStepSize, condition); |
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| 382 | |
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| 383 | #ifdef G4VERBOSE |
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| 384 | if ((currentInteractionLength <=0.0) || (verboseLevel>2)){ |
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| 385 | G4cout << "G4Decay::PostStepGetPhysicalInteractionLength " << G4endl; |
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| 386 | track.GetDynamicParticle()->DumpInfo(); |
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| 387 | G4cout << " in Material " << track.GetMaterial()->GetName() <<G4endl; |
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| 388 | G4cout << "MeanFreePath = " << currentInteractionLength/cm << "[cm]" <<G4endl; |
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| 389 | } |
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| 390 | #endif |
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| 391 | |
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| 392 | G4double value; |
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| 393 | if (currentInteractionLength <DBL_MAX) { |
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| 394 | value = theNumberOfInteractionLengthLeft * currentInteractionLength; |
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| 395 | } else { |
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| 396 | value = DBL_MAX; |
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| 397 | } |
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| 398 | |
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| 399 | return value; |
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| 400 | |
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| 401 | } else { |
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| 402 | //pre-assigned Decay time case |
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| 403 | // reminder proper time |
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| 404 | fRemainderLifeTime = pTime - track.GetProperTime(); |
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| 405 | if (fRemainderLifeTime <= 0.0) fRemainderLifeTime = DBL_MIN; |
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| 406 | G4double rvalue=0.0; |
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| 407 | // use pre-assigned Decay time to determine PIL |
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| 408 | if (aLife>0.0) { |
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| 409 | // ordinary particle |
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| 410 | rvalue = (fRemainderLifeTime/aLife)*GetMeanFreePath(track, previousStepSize |
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| 411 | , condition); |
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| 412 | } else { |
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| 413 | // shortlived particle |
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| 414 | rvalue = c_light * fRemainderLifeTime; |
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| 415 | // by using normalized kinetic energy (= Ekin/mass) |
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| 416 | G4double aMass = track.GetDynamicParticle()->GetMass(); |
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| 417 | rvalue *= track.GetDynamicParticle()->GetTotalMomentum()/aMass; |
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| 418 | } |
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| 419 | return rvalue; |
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| 420 | |
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| 421 | } |
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| 422 | } |
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| 423 | |
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| 424 | G4double G4Decay::AtRestGetPhysicalInteractionLength( |
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| 425 | const G4Track& track, |
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| 426 | G4ForceCondition* condition |
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| 427 | ) |
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| 428 | { |
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| 429 | // condition is set to "Not Forced" |
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| 430 | *condition = NotForced; |
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| 431 | |
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| 432 | G4double pTime = track.GetDynamicParticle()->GetPreAssignedDecayProperTime(); |
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| 433 | if (pTime >= 0.) { |
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| 434 | fRemainderLifeTime = pTime - track.GetProperTime(); |
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| 435 | if (fRemainderLifeTime <= 0.0) fRemainderLifeTime = DBL_MIN; |
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| 436 | } else { |
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| 437 | fRemainderLifeTime = |
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| 438 | theNumberOfInteractionLengthLeft * GetMeanLifeTime(track, condition); |
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| 439 | } |
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| 440 | return fRemainderLifeTime; |
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| 441 | } |
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