[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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[962] | 26 | // $Id: G4MuMinusCaptureCascade.cc,v 1.16 2008/05/05 09:09:06 vnivanch Exp $ |
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[1007] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 28 | // |
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| 29 | // G4MuonMinusCaptureAtRest physics process |
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| 30 | // |
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| 31 | // E-mail: Vladimir.Ivantchenko@cern.ch |
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| 32 | // |
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| 33 | // Created: 02.04.00 V.Ivanchenko |
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| 34 | // |
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| 35 | // Modified: |
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| 36 | // 06.04.01 V.Ivanchenko Bug in theta distribution fixed |
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| 37 | // 13.02.07 V.Ivanchenko Fixes in decay - add random distribution of e- |
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| 38 | // direction; factor 2 in potential energy |
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| 39 | // |
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| 40 | //---------------------------------------------------------------------- |
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| 41 | |
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| 42 | #include "G4MuMinusCaptureCascade.hh" |
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| 43 | #include "G4LorentzVector.hh" |
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| 44 | #include "G4ParticleMomentum.hh" |
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| 45 | #include "G4MuonMinus.hh" |
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| 46 | #include "G4Electron.hh" |
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| 47 | #include "G4Gamma.hh" |
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| 48 | #include "G4NeutrinoMu.hh" |
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| 49 | #include "G4AntiNeutrinoE.hh" |
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| 50 | #include "G4GHEKinematicsVector.hh" |
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| 51 | |
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| 52 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 53 | |
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| 54 | G4MuMinusCaptureCascade::G4MuMinusCaptureCascade() |
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| 55 | { |
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| 56 | theElectron = G4Electron::Electron(); |
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| 57 | theGamma = G4Gamma::Gamma(); |
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| 58 | Emass = theElectron->GetPDGMass(); |
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| 59 | MuMass = G4MuonMinus::MuonMinus()->GetPDGMass(); |
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| 60 | } |
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| 61 | |
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| 62 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 63 | |
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| 64 | G4MuMinusCaptureCascade::~G4MuMinusCaptureCascade() |
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| 65 | { } |
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| 66 | |
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| 67 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 68 | |
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| 69 | G4double G4MuMinusCaptureCascade::GetKShellEnergy(G4double Z) |
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| 70 | { |
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| 71 | // Calculate the Energy of K Mesoatom Level for this Element using |
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| 72 | // the Energy of Hydrogen Atom taken into account finite size of the |
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| 73 | // nucleus (V.Ivanchenko) |
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| 74 | const G4int ListK = 28; |
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| 75 | static G4double ListZK[ListK] = { |
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| 76 | 1., 2., 4., 6., 8., 11., 14., 17., 18., 21., 24., |
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| 77 | 26., 29., 32., 38., 40., 41., 44., 49., 53., 55., |
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| 78 | 60., 65., 70., 75., 81., 85., 92.}; |
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| 79 | static G4double ListKEnergy[ListK] = { |
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| 80 | 0.00275, 0.011, 0.043, 0.098, 0.173, 0.326, |
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| 81 | 0.524, 0.765, 0.853, 1.146, 1.472, |
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| 82 | 1.708, 2.081, 2.475, 3.323, 3.627, |
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| 83 | 3.779, 4.237, 5.016, 5.647, 5.966, |
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| 84 | 6.793, 7.602, 8.421, 9.249, 10.222, |
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| 85 | 10.923,11.984}; |
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| 86 | |
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| 87 | // Energy with finit size corrections |
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| 88 | G4double KEnergy = GetLinApprox(ListK,ListZK,ListKEnergy,Z); |
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| 89 | |
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| 90 | return KEnergy; |
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| 91 | } |
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| 92 | |
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| 93 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 94 | |
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| 95 | void G4MuMinusCaptureCascade::AddNewParticle(G4ParticleDefinition* aParticle, |
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| 96 | G4ThreeVector& Momentum, |
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| 97 | G4double mass, |
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| 98 | G4int* nParticle, |
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| 99 | G4GHEKinematicsVector* Cascade) |
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| 100 | { |
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| 101 | // Store particle in the HEK vector and increment counter |
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| 102 | Cascade[*nParticle].SetZero(); |
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| 103 | Cascade[*nParticle].SetMass( mass ); |
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| 104 | Cascade[*nParticle].SetMomentumAndUpdate(Momentum.x(), Momentum.y(), Momentum.z()); |
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| 105 | Cascade[*nParticle].SetParticleDef( aParticle ); |
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| 106 | (*nParticle)++; |
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| 107 | |
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| 108 | return; |
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| 109 | } |
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| 110 | |
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| 111 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 112 | |
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| 113 | G4int G4MuMinusCaptureCascade::DoCascade(const G4double Z, const G4double massA, |
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| 114 | G4GHEKinematicsVector* Cascade) |
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| 115 | { |
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| 116 | // Inicialization - cascade start from 14th level |
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| 117 | // N.C.Mukhopadhyay Phy. Rep. 30 (1977) 1. |
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| 118 | G4int nPart = 0; |
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| 119 | G4double EnergyLevel[14]; |
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| 120 | |
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| 121 | G4double mass = MuMass * massA / (MuMass + massA) ; |
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| 122 | |
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| 123 | const G4double KEnergy = 13.6 * eV * Z * Z * mass/ electron_mass_c2; |
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| 124 | |
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| 125 | EnergyLevel[0] = GetKShellEnergy(Z); |
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| 126 | for( G4int i = 2; i < 15; i++ ) { |
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| 127 | EnergyLevel[i-1] = KEnergy / (i*i) ; |
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| 128 | } |
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| 129 | |
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| 130 | G4int nElec = G4int(Z); |
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| 131 | G4int nAuger = 1; |
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| 132 | G4int nLevel = 13; |
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| 133 | G4double DeltaE; |
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| 134 | G4double pGamma = Z*Z*Z*Z; |
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| 135 | |
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| 136 | // Capture on 14-th level |
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| 137 | G4double ptot = std::sqrt(EnergyLevel[13]*(EnergyLevel[13] + 2.0*Emass)); |
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| 138 | G4ThreeVector moment = ptot * GetRandomVec(); |
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| 139 | |
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| 140 | AddNewParticle(theElectron,moment,Emass,&nPart,Cascade); |
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| 141 | |
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| 142 | // Emit new photon or electron |
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| 143 | // Simplified model for probabilities |
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| 144 | // N.C.Mukhopadhyay Phy. Rep. 30 (1977) 1. |
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| 145 | do { |
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| 146 | |
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| 147 | // case of Auger electrons |
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| 148 | if((nAuger < nElec) && ((pGamma + 10000.0) * G4UniformRand() < 10000.0) ) { |
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| 149 | nAuger++; |
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| 150 | DeltaE = EnergyLevel[nLevel-1] - EnergyLevel[nLevel]; |
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| 151 | nLevel--; |
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| 152 | |
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| 153 | ptot = std::sqrt(DeltaE * (DeltaE + 2.0*Emass)); |
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| 154 | moment = ptot * GetRandomVec(); |
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| 155 | |
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| 156 | AddNewParticle(theElectron, moment, Emass, &nPart, Cascade); |
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| 157 | |
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| 158 | } else { |
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| 159 | |
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| 160 | // Case of photon cascade, probabilities from |
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| 161 | // C.S.Wu and L.Wilets, Ann. Rev. Nuclear Sci. 19 (1969) 527. |
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| 162 | |
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| 163 | G4double var = (10.0 + G4double(nLevel - 1) ) * G4UniformRand(); |
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| 164 | G4int iLevel = nLevel - 1 ; |
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| 165 | if(var > 10.0) iLevel -= G4int(var-10.0) + 1; |
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| 166 | if( iLevel < 0 ) iLevel = 0; |
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| 167 | DeltaE = EnergyLevel[iLevel] - EnergyLevel[nLevel]; |
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| 168 | nLevel = iLevel; |
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| 169 | moment = DeltaE * GetRandomVec(); |
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| 170 | AddNewParticle(theGamma, moment, 0.0, &nPart, Cascade); |
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| 171 | } |
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| 172 | |
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| 173 | } while( nLevel > 0 ); |
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| 174 | |
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| 175 | return nPart; |
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| 176 | } |
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| 177 | |
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| 178 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 179 | |
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| 180 | void G4MuMinusCaptureCascade::DoBoundMuonMinusDecay(G4double Z, |
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| 181 | G4int* nCascade, |
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| 182 | G4GHEKinematicsVector* Cascade) |
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| 183 | { |
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| 184 | // Simulation on Decay of mu- on a K-shell of the muonic atom |
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| 185 | G4double xmax = ( 1.0 + Emass*Emass/ (MuMass*MuMass) ); |
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| 186 | G4double xmin = 2.0*Emass/MuMass; |
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| 187 | G4double KEnergy = GetKShellEnergy(Z); |
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| 188 | /* |
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| 189 | G4cout << "G4MuMinusCaptureCascade::DoBoundMuonMinusDecay" |
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| 190 | << " XMAX= " << xmax |
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| 191 | << " Ebound= " << KEnergy |
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| 192 | << G4endl; |
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| 193 | */ |
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| 194 | G4double pmu = std::sqrt(KEnergy*(KEnergy + 2.0*MuMass)); |
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| 195 | G4double emu = KEnergy + MuMass; |
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| 196 | G4ThreeVector moment = GetRandomVec(); |
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| 197 | G4LorentzVector MU(pmu*moment,emu); |
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| 198 | G4ThreeVector bst = MU.boostVector(); |
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| 199 | |
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| 200 | G4double Eelect, Pelect, x, ecm; |
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| 201 | G4LorentzVector EL, NN; |
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| 202 | // Calculate electron energy |
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| 203 | do { |
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| 204 | do { |
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| 205 | x = xmin + (xmax-xmin)*G4UniformRand(); |
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| 206 | } while (G4UniformRand() > (3.0 - 2.0*x)*x*x ); |
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| 207 | Eelect = x*MuMass*0.5; |
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| 208 | Pelect = 0.0; |
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| 209 | if(Eelect > Emass) { |
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| 210 | Pelect = std::sqrt( Eelect*Eelect - Emass*Emass ); |
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| 211 | } else { |
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| 212 | Pelect = 0.0; |
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| 213 | Eelect = Emass; |
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| 214 | } |
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| 215 | G4ThreeVector e_mom = GetRandomVec(); |
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| 216 | EL = G4LorentzVector(Pelect*e_mom,Eelect); |
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| 217 | EL.boost(bst); |
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| 218 | Eelect = EL.e() - Emass - 2.0*KEnergy; |
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| 219 | // |
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| 220 | // Calculate rest frame parameters of 2 neutrinos |
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| 221 | // |
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| 222 | NN = MU - EL; |
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| 223 | ecm = NN.mag2(); |
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| 224 | } while (Eelect < 0.0 || ecm < 0.0); |
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| 225 | |
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| 226 | // |
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| 227 | // Create electron |
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| 228 | // |
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| 229 | moment = std::sqrt(Eelect * (Eelect + 2.0*Emass))*(EL.vect().unit()); |
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| 230 | AddNewParticle(theElectron, moment, Emass, nCascade, Cascade); |
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| 231 | // |
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| 232 | // Create Neutrinos |
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| 233 | // |
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| 234 | ecm = 0.5*std::sqrt(ecm); |
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| 235 | bst = NN.boostVector(); |
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| 236 | G4ThreeVector p1 = ecm * GetRandomVec(); |
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| 237 | G4LorentzVector N1 = G4LorentzVector(p1,ecm); |
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| 238 | N1.boost(bst); |
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| 239 | G4ThreeVector p1lab = N1.vect(); |
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| 240 | AddNewParticle(G4AntiNeutrinoE::AntiNeutrinoE(),p1lab,0.0,nCascade,Cascade); |
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| 241 | NN -= N1; |
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| 242 | G4ThreeVector p2lab = NN.vect(); |
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| 243 | AddNewParticle(G4NeutrinoMu::NeutrinoMu(),p2lab,0.0,nCascade,Cascade); |
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| 244 | |
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| 245 | return; |
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| 246 | } |
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