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: G4TauPlus.cc,v 1.19 2009/10/09 14:34:02 kurasige Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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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 | // 4th April 1996, G.Cosmo |
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36 | // 7 July 1996 H.Kurashige |
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37 | // ********************************************************************** |
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38 | // New impelemenataion as an utility class M.Asai, 26 July 2004 |
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39 | // ---------------------------------------------------------------------- |
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40 | |
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41 | #include "G4TauPlus.hh" |
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42 | #include "G4ParticleTable.hh" |
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43 | |
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44 | #include "G4PhaseSpaceDecayChannel.hh" |
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45 | #include "G4TauLeptonicDecayChannel.hh" |
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46 | #include "G4DecayTable.hh" |
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47 | |
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48 | // ###################################################################### |
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49 | // ### TAPLUS ### |
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50 | // ###################################################################### |
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51 | G4TauPlus* G4TauPlus::theInstance = 0; |
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52 | |
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53 | G4TauPlus* G4TauPlus::Definition() |
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54 | { |
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55 | if (theInstance !=0) return theInstance; |
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56 | const G4String name = "tau+"; |
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57 | // search in particle table] |
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58 | G4ParticleTable* pTable = G4ParticleTable::GetParticleTable(); |
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59 | G4ParticleDefinition* anInstance = pTable->FindParticle(name); |
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60 | if (anInstance ==0) |
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61 | { |
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62 | // create particle |
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63 | // |
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64 | // Arguments for constructor are as follows |
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65 | // name mass width charge |
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66 | // 2*spin parity C-conjugation |
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67 | // 2*Isospin 2*Isospin3 G-parity |
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68 | // type lepton number baryon number PDG encoding |
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69 | // stable lifetime decay table |
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70 | // shortlived subType anti_encoding |
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71 | anInstance = new G4ParticleDefinition( |
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72 | name, 1.77684*GeV, 2.280e-9*MeV, 1.*eplus, |
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73 | 1, 0, 0, |
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74 | 0, 0, 0, |
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75 | "lepton", -1, 0, -15, |
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76 | false, 290.6e-6*ns, NULL, |
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77 | false, "tau" |
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78 | ); |
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79 | // Bohr Magnetron |
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80 | G4double muB = 0.5*eplus*hbar_Planck/(1.77699*GeV/c_squared) ; |
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81 | |
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82 | anInstance->SetPDGMagneticMoment( muB * 2.* 1.00116); |
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83 | |
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84 | //create Decay Table |
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85 | G4DecayTable* table = new G4DecayTable(); |
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86 | |
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87 | // create decay channels |
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88 | G4VDecayChannel* mode; |
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89 | // tau+ -> mu+ + nu_mu + anti_nu_tau |
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90 | mode = new G4TauLeptonicDecayChannel("tau+",0.1736,"mu+"); |
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91 | table->Insert(mode); |
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92 | // tau+ -> e+ + nu_e + anti_nu_tau |
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93 | mode = new G4TauLeptonicDecayChannel("tau+",0.1784,"e+"); |
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94 | table->Insert(mode); |
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95 | // tau+ -> pi+ + anti_nu_tau |
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96 | mode = new G4PhaseSpaceDecayChannel("tau+",0.1106,2,"pi+","anti_nu_tau"); |
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97 | table->Insert(mode); |
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98 | // tau+ -> pi0 + pi0 + pi+ + anti_nu_tau |
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99 | mode = new G4PhaseSpaceDecayChannel("tau+",0.2541,3,"pi0","pi+","anti_nu_tau"); |
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100 | table->Insert(mode); |
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101 | // tau+ -> pi0 + pi0 + pi+ + anti_nu_tau |
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102 | mode = new G4PhaseSpaceDecayChannel(); |
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103 | mode->SetParent("tau+"); |
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104 | mode->SetBR(0.0917); |
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105 | mode->SetNumberOfDaughters(4); |
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106 | mode->SetDaughter(0,"pi0"); |
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107 | mode->SetDaughter(1,"pi0"); |
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108 | mode->SetDaughter(2,"pi+"); |
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109 | mode->SetDaughter(3,"anti_nu_tau"); |
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110 | table->Insert(mode); |
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111 | // tau+ -> pi+ + pi+ + pi- + anti_nu_tau |
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112 | mode = new G4PhaseSpaceDecayChannel(); |
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113 | mode->SetParent("tau+"); |
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114 | mode->SetBR(0.0946); |
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115 | mode->SetNumberOfDaughters(4); |
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116 | mode->SetDaughter(0,"pi+"); |
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117 | mode->SetDaughter(1,"pi+"); |
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118 | mode->SetDaughter(2,"pi-"); |
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119 | mode->SetDaughter(3,"anti_nu_tau"); |
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120 | table->Insert(mode); |
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121 | |
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122 | anInstance->SetDecayTable(table); |
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123 | } |
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124 | theInstance = reinterpret_cast<G4TauPlus*>(anInstance); |
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125 | return theInstance; |
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126 | } |
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127 | |
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128 | G4TauPlus* G4TauPlus::TauPlusDefinition() |
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129 | { |
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130 | return Definition(); |
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131 | } |
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132 | |
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133 | G4TauPlus* G4TauPlus::TauPlus() |
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134 | { |
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135 | return Definition(); |
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136 | } |
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137 | |
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