[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 | // |
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| 28 | // $Id: G4GeneralSpaceDecay.cc,v 1.0 1998/05/21 |
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| 29 | // ---------------------------------------------------------------- |
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| 30 | // GEANT 4 class header file |
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| 31 | // |
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| 32 | // History: first implementation, A. Feliciello, 21st May 1998 |
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| 33 | // |
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| 34 | // Note: this class is a generalization of the |
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| 35 | // G4PhaseSpaceDecayChannel one |
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| 36 | // ---------------------------------------------------------------- |
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| 37 | |
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| 38 | #include "G4ParticleDefinition.hh" |
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| 39 | #include "G4DecayProducts.hh" |
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| 40 | #include "G4VDecayChannel.hh" |
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| 41 | #include "G4GeneralPhaseSpaceDecay.hh" |
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| 42 | #include "Randomize.hh" |
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| 43 | #include "G4LorentzVector.hh" |
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| 44 | #include "G4LorentzRotation.hh" |
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| 45 | #include "G4ios.hh" |
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| 46 | |
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| 47 | |
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| 48 | G4GeneralPhaseSpaceDecay::G4GeneralPhaseSpaceDecay(G4int Verbose) : |
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| 49 | G4VDecayChannel("Phase Space", Verbose), |
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| 50 | theDaughterMasses(0) |
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| 51 | { |
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| 52 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay:: constructor " << G4endl; |
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| 53 | } |
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| 54 | |
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| 55 | G4GeneralPhaseSpaceDecay::G4GeneralPhaseSpaceDecay(const G4String& theParentName, |
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| 56 | G4double theBR, |
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| 57 | G4int theNumberOfDaughters, |
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| 58 | const G4String& theDaughterName1, |
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| 59 | const G4String& theDaughterName2, |
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| 60 | const G4String& theDaughterName3) : |
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| 61 | G4VDecayChannel("Phase Space", |
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| 62 | theParentName,theBR, |
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| 63 | theNumberOfDaughters, |
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| 64 | theDaughterName1, |
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| 65 | theDaughterName2, |
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| 66 | theDaughterName3), |
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| 67 | theDaughterMasses(0) |
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| 68 | { |
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| 69 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay:: constructor " << G4endl; |
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| 70 | |
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| 71 | // Set the parent particle (resonance) mass to the (default) PDG vale |
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| 72 | if (parent != NULL) |
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| 73 | { |
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| 74 | parentmass = parent->GetPDGMass(); |
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| 75 | } |
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| 76 | } |
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| 77 | |
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| 78 | G4GeneralPhaseSpaceDecay::G4GeneralPhaseSpaceDecay(const G4String& theParentName, |
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| 79 | G4double theParentMass, |
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| 80 | G4double theBR, |
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| 81 | G4int theNumberOfDaughters, |
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| 82 | const G4String& theDaughterName1, |
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| 83 | const G4String& theDaughterName2, |
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| 84 | const G4String& theDaughterName3) : |
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| 85 | G4VDecayChannel("Phase Space", |
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| 86 | theParentName,theBR, |
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| 87 | theNumberOfDaughters, |
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| 88 | theDaughterName1, |
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| 89 | theDaughterName2, |
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| 90 | theDaughterName3), |
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| 91 | parentmass(theParentMass), |
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| 92 | theDaughterMasses(0) |
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| 93 | { |
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| 94 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay:: constructor " << G4endl; |
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| 95 | } |
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| 96 | |
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| 97 | G4GeneralPhaseSpaceDecay::G4GeneralPhaseSpaceDecay(const G4String& theParentName, |
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| 98 | G4double theParentMass, |
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| 99 | G4double theBR, |
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| 100 | G4int theNumberOfDaughters, |
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| 101 | const G4String& theDaughterName1, |
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| 102 | const G4String& theDaughterName2, |
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| 103 | const G4String& theDaughterName3, |
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| 104 | const G4double *masses) : |
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| 105 | G4VDecayChannel("Phase Space", |
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| 106 | theParentName,theBR, |
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| 107 | theNumberOfDaughters, |
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| 108 | theDaughterName1, |
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| 109 | theDaughterName2, |
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| 110 | theDaughterName3), |
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| 111 | parentmass(theParentMass), |
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| 112 | theDaughterMasses(masses) |
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| 113 | { |
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| 114 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay:: constructor " << G4endl; |
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| 115 | } |
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| 116 | |
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| 117 | G4GeneralPhaseSpaceDecay::~G4GeneralPhaseSpaceDecay() |
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| 118 | { |
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| 119 | } |
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| 120 | |
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| 121 | G4DecayProducts *G4GeneralPhaseSpaceDecay::DecayIt(G4double) |
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| 122 | { |
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| 123 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay::DecayIt "; |
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| 124 | G4DecayProducts * products = NULL; |
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| 125 | |
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| 126 | if (parent == NULL) FillParent(); |
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| 127 | if (daughters == NULL) FillDaughters(); |
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| 128 | |
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| 129 | switch (numberOfDaughters){ |
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| 130 | case 0: |
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| 131 | if (GetVerboseLevel()>0) { |
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| 132 | G4cout << "G4GeneralPhaseSpaceDecay::DecayIt "; |
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| 133 | G4cout << " daughters not defined " <<G4endl; |
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| 134 | } |
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| 135 | break; |
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| 136 | case 1: |
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| 137 | products = OneBodyDecayIt(); |
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| 138 | break; |
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| 139 | case 2: |
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| 140 | products = TwoBodyDecayIt(); |
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| 141 | break; |
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| 142 | case 3: |
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| 143 | products = ThreeBodyDecayIt(); |
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| 144 | break; |
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| 145 | default: |
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| 146 | products = ManyBodyDecayIt(); |
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| 147 | break; |
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| 148 | } |
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| 149 | if ((products == NULL) && (GetVerboseLevel()>0)) { |
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| 150 | G4cout << "G4GeneralPhaseSpaceDecay::DecayIt "; |
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| 151 | G4cout << *parent_name << " can not decay " << G4endl; |
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| 152 | DumpInfo(); |
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| 153 | } |
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| 154 | return products; |
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| 155 | } |
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| 156 | |
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| 157 | G4DecayProducts *G4GeneralPhaseSpaceDecay::OneBodyDecayIt() |
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| 158 | { |
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| 159 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay::OneBodyDecayIt()"<<G4endl; |
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| 160 | |
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| 161 | // G4double daughtermass = daughters[0]->GetPDGMass(); |
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| 162 | |
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| 163 | //create parent G4DynamicParticle at rest |
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| 164 | G4ParticleMomentum dummy; |
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| 165 | G4DynamicParticle * parentparticle = new G4DynamicParticle(parent, dummy, 0.0); |
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| 166 | |
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| 167 | //create G4Decayproducts |
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| 168 | G4DecayProducts *products = new G4DecayProducts(*parentparticle); |
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| 169 | delete parentparticle; |
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| 170 | |
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| 171 | //create daughter G4DynamicParticle at rest |
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| 172 | G4DynamicParticle * daughterparticle = new G4DynamicParticle(daughters[0], dummy, 0.0); |
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| 173 | products->PushProducts(daughterparticle); |
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| 174 | |
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| 175 | if (GetVerboseLevel()>1) |
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| 176 | { |
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| 177 | G4cout << "G4GeneralPhaseSpaceDecay::OneBodyDecayIt "; |
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| 178 | G4cout << " create decay products in rest frame " <<G4endl; |
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| 179 | products->DumpInfo(); |
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| 180 | } |
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| 181 | return products; |
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| 182 | } |
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| 183 | |
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| 184 | G4DecayProducts *G4GeneralPhaseSpaceDecay::TwoBodyDecayIt() |
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| 185 | { |
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| 186 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay::TwoBodyDecayIt()"<<G4endl; |
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| 187 | |
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| 188 | //daughters'mass |
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| 189 | G4double daughtermass[2]; |
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| 190 | G4double daughtermomentum; |
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| 191 | if ( theDaughterMasses ) |
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| 192 | { |
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| 193 | daughtermass[0]= *(theDaughterMasses); |
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| 194 | daughtermass[1] = *(theDaughterMasses+1); |
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| 195 | } else { |
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| 196 | daughtermass[0] = daughters[0]->GetPDGMass(); |
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| 197 | daughtermass[1] = daughters[1]->GetPDGMass(); |
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| 198 | } |
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| 199 | |
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| 200 | // G4double sumofdaughtermass = daughtermass[0] + daughtermass[1]; |
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| 201 | |
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| 202 | //create parent G4DynamicParticle at rest |
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| 203 | G4ParticleMomentum dummy; |
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| 204 | G4DynamicParticle * parentparticle = new G4DynamicParticle( parent, dummy, 0.0); |
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| 205 | |
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| 206 | //create G4Decayproducts @@GF why dummy parentparticle? |
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| 207 | G4DecayProducts *products = new G4DecayProducts(*parentparticle); |
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| 208 | delete parentparticle; |
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| 209 | |
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| 210 | //calculate daughter momentum |
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| 211 | daughtermomentum = Pmx(parentmass,daughtermass[0],daughtermass[1]); |
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| 212 | G4double costheta = 2.*G4UniformRand()-1.0; |
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| 213 | G4double sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta)); |
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| 214 | G4double phi = twopi*G4UniformRand()*rad; |
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| 215 | G4ParticleMomentum direction(sintheta*std::cos(phi),sintheta*std::sin(phi),costheta); |
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| 216 | |
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| 217 | //create daughter G4DynamicParticle |
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| 218 | G4double Etotal= std::sqrt(daughtermass[0]*daughtermass[0] + daughtermomentum*daughtermomentum); |
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| 219 | G4DynamicParticle * daughterparticle = new G4DynamicParticle( daughters[0],Etotal, direction*daughtermomentum); |
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| 220 | products->PushProducts(daughterparticle); |
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| 221 | Etotal= std::sqrt(daughtermass[1]*daughtermass[1] + daughtermomentum*daughtermomentum); |
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| 222 | daughterparticle = new G4DynamicParticle( daughters[1],Etotal, direction*(-1.0*daughtermomentum)); |
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| 223 | products->PushProducts(daughterparticle); |
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| 224 | |
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| 225 | if (GetVerboseLevel()>1) |
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| 226 | { |
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| 227 | G4cout << "G4GeneralPhaseSpaceDecay::TwoBodyDecayIt "; |
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| 228 | G4cout << " create decay products in rest frame " <<G4endl; |
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| 229 | products->DumpInfo(); |
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| 230 | } |
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| 231 | return products; |
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| 232 | } |
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| 233 | |
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| 234 | G4DecayProducts *G4GeneralPhaseSpaceDecay::ThreeBodyDecayIt() |
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| 235 | // algorism of this code is originally written in GDECA3 of GEANT3 |
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| 236 | { |
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| 237 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay::ThreeBodyDecayIt()"<<G4endl; |
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| 238 | |
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| 239 | //daughters'mass |
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| 240 | G4double daughtermass[3]; |
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| 241 | G4double sumofdaughtermass = 0.0; |
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| 242 | for (G4int index=0; index<3; index++) |
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| 243 | { |
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| 244 | if ( theDaughterMasses ) |
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| 245 | { |
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| 246 | daughtermass[index]= *(theDaughterMasses+index); |
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| 247 | } else { |
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| 248 | daughtermass[index] = daughters[index]->GetPDGMass(); |
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| 249 | } |
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| 250 | sumofdaughtermass += daughtermass[index]; |
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| 251 | } |
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| 252 | |
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| 253 | //create parent G4DynamicParticle at rest |
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| 254 | G4ParticleMomentum dummy; |
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| 255 | G4DynamicParticle * parentparticle = new G4DynamicParticle( parent, dummy, 0.0); |
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| 256 | |
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| 257 | //create G4Decayproducts |
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| 258 | G4DecayProducts *products = new G4DecayProducts(*parentparticle); |
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| 259 | delete parentparticle; |
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| 260 | |
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| 261 | //calculate daughter momentum |
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| 262 | // Generate two |
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| 263 | G4double rd1, rd2, rd; |
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| 264 | G4double daughtermomentum[3]; |
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| 265 | G4double momentummax=0.0, momentumsum = 0.0; |
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| 266 | G4double energy; |
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| 267 | |
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| 268 | do |
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| 269 | { |
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| 270 | rd1 = G4UniformRand(); |
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| 271 | rd2 = G4UniformRand(); |
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| 272 | if (rd2 > rd1) |
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| 273 | { |
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| 274 | rd = rd1; |
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| 275 | rd1 = rd2; |
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| 276 | rd2 = rd; |
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| 277 | } |
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| 278 | momentummax = 0.0; |
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| 279 | momentumsum = 0.0; |
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| 280 | // daughter 0 |
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| 281 | |
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| 282 | energy = rd2*(parentmass - sumofdaughtermass); |
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| 283 | daughtermomentum[0] = std::sqrt(energy*energy + 2.0*energy* daughtermass[0]); |
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| 284 | if ( daughtermomentum[0] >momentummax )momentummax = daughtermomentum[0]; |
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| 285 | momentumsum += daughtermomentum[0]; |
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| 286 | |
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| 287 | // daughter 1 |
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| 288 | energy = (1.-rd1)*(parentmass - sumofdaughtermass); |
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| 289 | daughtermomentum[1] = std::sqrt(energy*energy + 2.0*energy* daughtermass[1]); |
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| 290 | if ( daughtermomentum[1] >momentummax )momentummax = daughtermomentum[1]; |
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| 291 | momentumsum += daughtermomentum[1]; |
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| 292 | |
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| 293 | // daughter 2 |
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| 294 | energy = (rd1-rd2)*(parentmass - sumofdaughtermass); |
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| 295 | daughtermomentum[2] = std::sqrt(energy*energy + 2.0*energy* daughtermass[2]); |
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| 296 | if ( daughtermomentum[2] >momentummax )momentummax = daughtermomentum[2]; |
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| 297 | momentumsum += daughtermomentum[2]; |
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| 298 | } while (momentummax > momentumsum - momentummax ); |
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| 299 | |
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| 300 | // output message |
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| 301 | if (GetVerboseLevel()>1) { |
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| 302 | G4cout << " daughter 0:" << daughtermomentum[0]/GeV << "[GeV/c]" <<G4endl; |
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| 303 | G4cout << " daughter 1:" << daughtermomentum[1]/GeV << "[GeV/c]" <<G4endl; |
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| 304 | G4cout << " daughter 2:" << daughtermomentum[2]/GeV << "[GeV/c]" <<G4endl; |
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| 305 | G4cout << " momentum sum:" << momentumsum/GeV << "[GeV/c]" <<G4endl; |
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| 306 | } |
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| 307 | |
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| 308 | //create daughter G4DynamicParticle |
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| 309 | G4double costheta, sintheta, phi, sinphi, cosphi; |
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| 310 | G4double costhetan, sinthetan, phin, sinphin, cosphin; |
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| 311 | costheta = 2.*G4UniformRand()-1.0; |
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| 312 | sintheta = std::sqrt((1.0-costheta)*(1.0+costheta)); |
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| 313 | phi = twopi*G4UniformRand()*rad; |
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| 314 | sinphi = std::sin(phi); |
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| 315 | cosphi = std::cos(phi); |
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| 316 | G4ParticleMomentum direction0(sintheta*cosphi,sintheta*sinphi,costheta); |
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| 317 | G4double Etotal=std::sqrt( daughtermass[0]*daughtermass[0] + daughtermomentum[0]*daughtermomentum[0]); |
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| 318 | G4DynamicParticle * daughterparticle |
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| 319 | = new G4DynamicParticle( daughters[0], Etotal, direction0*daughtermomentum[0]); |
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| 320 | products->PushProducts(daughterparticle); |
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| 321 | |
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| 322 | costhetan = (daughtermomentum[1]*daughtermomentum[1]-daughtermomentum[2]*daughtermomentum[2]-daughtermomentum[0]*daughtermomentum[0])/(2.0*daughtermomentum[2]*daughtermomentum[0]); |
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| 323 | sinthetan = std::sqrt((1.0-costhetan)*(1.0+costhetan)); |
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| 324 | phin = twopi*G4UniformRand()*rad; |
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| 325 | sinphin = std::sin(phin); |
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| 326 | cosphin = std::cos(phin); |
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| 327 | G4ParticleMomentum direction2; |
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| 328 | direction2.setX( sinthetan*cosphin*costheta*cosphi - sinthetan*sinphin*sinphi + costhetan*sintheta*cosphi); |
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| 329 | direction2.setY( sinthetan*cosphin*costheta*sinphi + sinthetan*sinphin*cosphi + costhetan*sintheta*sinphi); |
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| 330 | direction2.setZ( -sinthetan*cosphin*sintheta + costhetan*costheta); |
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| 331 | Etotal=std::sqrt( daughtermass[2]*daughtermass[2] + daughtermomentum[2]*daughtermomentum[2]/direction2.mag2()); |
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| 332 | daughterparticle = new G4DynamicParticle( daughters[2],Etotal, direction2*(daughtermomentum[2]/direction2.mag())); |
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| 333 | products->PushProducts(daughterparticle); |
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| 334 | G4ThreeVector mom=(direction0*daughtermomentum[0] + direction2*(daughtermomentum[2]/direction2.mag()))*(-1.0); |
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| 335 | Etotal= std::sqrt( daughtermass[1]*daughtermass[1] + mom.mag2() ); |
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| 336 | daughterparticle = |
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| 337 | new G4DynamicParticle(daughters[1], Etotal, mom); |
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| 338 | products->PushProducts(daughterparticle); |
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| 339 | |
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| 340 | if (GetVerboseLevel()>1) { |
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| 341 | G4cout << "G4GeneralPhaseSpaceDecay::ThreeBodyDecayIt "; |
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| 342 | G4cout << " create decay products in rest frame " <<G4endl; |
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| 343 | products->DumpInfo(); |
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| 344 | } |
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| 345 | return products; |
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| 346 | } |
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| 347 | |
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| 348 | G4DecayProducts *G4GeneralPhaseSpaceDecay::ManyBodyDecayIt() |
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| 349 | // algorism of this code is originally written in FORTRAN by M.Asai |
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| 350 | //***************************************************************** |
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| 351 | // NBODY |
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| 352 | // N-body phase space Monte-Carlo generator |
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| 353 | // Makoto Asai |
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| 354 | // Hiroshima Institute of Technology |
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| 355 | // (asai@kekvax.kek.jp) |
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| 356 | // Revised release : 19/Apr/1995 |
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| 357 | // |
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| 358 | { |
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| 359 | //return value |
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| 360 | G4DecayProducts *products; |
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| 361 | |
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| 362 | if (GetVerboseLevel()>1) G4cout << "G4GeneralPhaseSpaceDecay::ManyBodyDecayIt()"<<G4endl; |
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| 363 | |
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| 364 | //daughters'mass |
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| 365 | G4double *daughtermass = new G4double[numberOfDaughters]; |
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| 366 | G4double sumofdaughtermass = 0.0; |
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| 367 | for (G4int index=0; index<numberOfDaughters; index++){ |
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| 368 | daughtermass[index] = daughters[index]->GetPDGMass(); |
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| 369 | sumofdaughtermass += daughtermass[index]; |
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| 370 | } |
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| 371 | |
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| 372 | //Calculate daughter momentum |
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| 373 | G4double *daughtermomentum = new G4double[numberOfDaughters]; |
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| 374 | G4ParticleMomentum direction; |
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| 375 | G4DynamicParticle **daughterparticle; |
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| 376 | G4double *sm = new G4double[numberOfDaughters]; |
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| 377 | G4double tmas; |
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| 378 | G4double weight = 1.0; |
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| 379 | G4int numberOfTry = 0; |
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| 380 | G4int index1, index2; |
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| 381 | |
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| 382 | do { |
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| 383 | //Generate rundom number in descending order |
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| 384 | G4double temp; |
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| 385 | G4double *rd = new G4double[numberOfDaughters]; |
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| 386 | rd[0] = 1.0; |
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| 387 | for(index1 =1; index1 < numberOfDaughters -1; index1++) |
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| 388 | rd[index1] = G4UniformRand(); |
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| 389 | rd[ numberOfDaughters -1] = 0.0; |
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| 390 | for(index1 =1; index1 < numberOfDaughters -1; index1++) { |
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| 391 | for(index2 = index1+1; index2 < numberOfDaughters; index2++) { |
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| 392 | if (rd[index1] < rd[index2]){ |
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| 393 | temp = rd[index1]; |
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| 394 | rd[index1] = rd[index2]; |
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| 395 | rd[index2] = temp; |
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| 396 | } |
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| 397 | } |
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| 398 | } |
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| 399 | |
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| 400 | //calcurate virtual mass |
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| 401 | tmas = parentmass - sumofdaughtermass; |
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| 402 | temp = sumofdaughtermass; |
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| 403 | for(index1 =0; index1 < numberOfDaughters; index1++) { |
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| 404 | sm[index1] = rd[index1]*tmas + temp; |
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| 405 | temp -= daughtermass[index1]; |
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| 406 | if (GetVerboseLevel()>1) { |
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| 407 | G4cout << index1 << " rundom number:" << rd[index1]; |
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| 408 | G4cout << " virtual mass:" << sm[index1]/GeV << "[GeV/c/c]" <<G4endl; |
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| 409 | } |
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| 410 | } |
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| 411 | delete [] rd; |
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| 412 | |
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| 413 | //Calculate daughter momentum |
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| 414 | weight = 1.0; |
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| 415 | index1 =numberOfDaughters-1; |
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| 416 | daughtermomentum[index1]= Pmx( sm[index1-1],daughtermass[index1-1],sm[index1]); |
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| 417 | if (GetVerboseLevel()>1) { |
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| 418 | G4cout << " daughter " << index1 << ":" << *daughters_name[index1]; |
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| 419 | G4cout << " momentum:" << daughtermomentum[index1]/GeV << "[GeV/c]" <<G4endl; |
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| 420 | } |
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| 421 | for(index1 =numberOfDaughters-2; index1>=0; index1--) { |
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| 422 | // calculate |
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| 423 | daughtermomentum[index1]= Pmx( sm[index1],daughtermass[index1], sm[index1 +1]); |
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| 424 | if(daughtermomentum[index1] < 0.0) { |
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| 425 | // !!! illegal momentum !!! |
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| 426 | if (GetVerboseLevel()>0) { |
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| 427 | G4cout << "G4GeneralPhaseSpaceDecay::ManyBodyDecayIt "; |
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| 428 | G4cout << " can not calculate daughter momentum " <<G4endl; |
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| 429 | G4cout << " parent:" << *parent_name; |
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| 430 | G4cout << " mass:" << parentmass/GeV << "[GeV/c/c]" <<G4endl; |
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| 431 | G4cout << " daughter " << index1 << ":" << *daughters_name[index1]; |
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| 432 | G4cout << " mass:" << daughtermass[index1]/GeV << "[GeV/c/c]" ; |
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| 433 | G4cout << " mass:" << daughtermomentum[index1]/GeV << "[GeV/c]" <<G4endl; |
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| 434 | } |
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| 435 | delete [] sm; |
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| 436 | delete [] daughtermass; |
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| 437 | delete [] daughtermomentum; |
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| 438 | return NULL; // Error detection |
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| 439 | |
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| 440 | } else { |
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| 441 | // calculate weight of this events |
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| 442 | weight *= daughtermomentum[index1]/sm[index1]; |
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| 443 | if (GetVerboseLevel()>1) { |
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| 444 | G4cout << " daughter " << index1 << ":" << *daughters_name[index1]; |
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| 445 | G4cout << " momentum:" << daughtermomentum[index1]/GeV << "[GeV/c]" <<G4endl; |
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| 446 | } |
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| 447 | } |
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| 448 | } |
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| 449 | if (GetVerboseLevel()>1) { |
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| 450 | G4cout << " weight: " << weight <<G4endl; |
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| 451 | } |
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| 452 | |
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| 453 | // exit if number of Try exceeds 100 |
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| 454 | if (numberOfTry++ >100) { |
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| 455 | if (GetVerboseLevel()>0) { |
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| 456 | G4cout << "G4GeneralPhaseSpaceDecay::ManyBodyDecayIt: "; |
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| 457 | G4cout << " can not determine Decay Kinematics " << G4endl; |
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| 458 | } |
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| 459 | delete [] sm; |
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| 460 | delete [] daughtermass; |
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| 461 | delete [] daughtermomentum; |
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| 462 | return NULL; // Error detection |
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| 463 | } |
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| 464 | } while ( weight > G4UniformRand()); |
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| 465 | if (GetVerboseLevel()>1) { |
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| 466 | G4cout << "Start calulation of daughters momentum vector "<<G4endl; |
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| 467 | } |
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| 468 | |
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| 469 | G4double costheta, sintheta, phi; |
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| 470 | G4double beta; |
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| 471 | daughterparticle = new G4DynamicParticle*[numberOfDaughters]; |
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| 472 | |
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| 473 | index1 = numberOfDaughters -2; |
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| 474 | costheta = 2.*G4UniformRand()-1.0; |
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| 475 | sintheta = std::sqrt((1.0-costheta)*(1.0+costheta)); |
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| 476 | phi = twopi*G4UniformRand()*rad; |
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| 477 | direction.setZ(costheta); |
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| 478 | direction.setY(sintheta*std::sin(phi)); |
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| 479 | direction.setX(sintheta*std::cos(phi)); |
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| 480 | daughterparticle[index1] = new G4DynamicParticle( daughters[index1], direction*daughtermomentum[index1] ); |
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| 481 | daughterparticle[index1+1] = new G4DynamicParticle( daughters[index1+1], direction*(-1.0*daughtermomentum[index1]) ); |
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| 482 | |
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| 483 | for (index1 = numberOfDaughters -3; index1 >= 0; index1--) { |
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| 484 | //calculate momentum direction |
---|
| 485 | costheta = 2.*G4UniformRand()-1.0; |
---|
| 486 | sintheta = std::sqrt((1.0-costheta)*(1.0+costheta)); |
---|
| 487 | phi = twopi*G4UniformRand()*rad; |
---|
| 488 | direction.setZ(costheta); |
---|
| 489 | direction.setY(sintheta*std::sin(phi)); |
---|
| 490 | direction.setX(sintheta*std::cos(phi)); |
---|
| 491 | |
---|
| 492 | // boost already created particles |
---|
| 493 | beta = daughtermomentum[index1]; |
---|
| 494 | beta /= std::sqrt( daughtermomentum[index1]*daughtermomentum[index1] + sm[index1+1]*sm[index1+1] ); |
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| 495 | for (G4int index2 = index1+1; index2<numberOfDaughters; index2++) { |
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| 496 | G4LorentzVector p4; |
---|
| 497 | // make G4LorentzVector for secondaries |
---|
| 498 | p4 = daughterparticle[index2]->Get4Momentum(); |
---|
| 499 | |
---|
| 500 | // boost secondaries to new frame |
---|
| 501 | p4.boost( direction.x()*beta, direction.y()*beta, direction.z()*beta); |
---|
| 502 | |
---|
| 503 | // change energy/momentum |
---|
| 504 | daughterparticle[index2]->Set4Momentum(p4); |
---|
| 505 | } |
---|
| 506 | //create daughter G4DynamicParticle |
---|
| 507 | daughterparticle[index1]= new G4DynamicParticle( daughters[index1], direction*(-1.0*daughtermomentum[index1])); |
---|
| 508 | } |
---|
| 509 | |
---|
| 510 | //create G4Decayproducts |
---|
| 511 | G4DynamicParticle *parentparticle; |
---|
| 512 | direction.setX(1.0); direction.setY(0.0); direction.setZ(0.0); |
---|
| 513 | parentparticle = new G4DynamicParticle( parent, direction, 0.0); |
---|
| 514 | products = new G4DecayProducts(*parentparticle); |
---|
| 515 | delete parentparticle; |
---|
| 516 | for (index1 = 0; index1<numberOfDaughters; index1++) { |
---|
| 517 | products->PushProducts(daughterparticle[index1]); |
---|
| 518 | } |
---|
| 519 | if (GetVerboseLevel()>1) { |
---|
| 520 | G4cout << "G4GeneralPhaseSpaceDecay::ManyBodyDecayIt "; |
---|
| 521 | G4cout << " create decay products in rest frame " << G4endl; |
---|
| 522 | products->DumpInfo(); |
---|
| 523 | } |
---|
| 524 | |
---|
| 525 | delete [] daughterparticle; |
---|
| 526 | delete [] daughtermomentum; |
---|
| 527 | delete [] daughtermass; |
---|
| 528 | delete [] sm; |
---|
| 529 | |
---|
| 530 | return products; |
---|
| 531 | } |
---|
| 532 | |
---|
| 533 | |
---|
| 534 | |
---|
| 535 | |
---|
| 536 | |
---|