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1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers *
6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which *
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9 // * include a list of copyright holders. <<
10 // * 9 // * *
11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file << 14 // * use. *
16 // * for the full disclaimer and the limitatio <<
17 // * 15 // * *
18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work *
21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. *
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* 21 // ********************************************************************
25 // 22 //
>> 23 //
>> 24 // $Id: G4Positron.cc,v 1.6 2001/10/16 08:16:18 kurasige Exp $
>> 25 // GEANT4 tag $Name: geant4-04-01 $
>> 26 //
>> 27 //
26 // ------------------------------------------- 28 // ----------------------------------------------------------------------
27 // GEANT 4 class implementation file 29 // GEANT 4 class implementation file
28 // 30 //
29 // History: first implementation, based o 31 // History: first implementation, based on object model of
30 // 4th April 1996, G.Cosmo 32 // 4th April 1996, G.Cosmo
31 // ******************************************* 33 // **********************************************************************
32 // New impelemenataion as an utility class M << 34 // Added particle definitions, H.Kurashige, 19 April 1996
>> 35 // Added SetCuts implementation, L.Urban, 12 June 1996
>> 36 // Code uses operators (+=, *=, ++, -> etc.) correctly, P. Urban, 26/6/96
>> 37 // Add PositronDefinition(), H.Kurashige 4 July 1996
33 // ------------------------------------------- 38 // ----------------------------------------------------------------------
34 39
>> 40 #include "g4std/fstream"
>> 41 #include "g4std/iomanip"
>> 42
35 #include "G4Positron.hh" 43 #include "G4Positron.hh"
>> 44
>> 45 // ######################################################################
>> 46 // ### POSITRON ###
>> 47 // ######################################################################
>> 48
>> 49 G4Positron::G4Positron(
>> 50 const G4String& aName, G4double mass,
>> 51 G4double width, G4double charge,
>> 52 G4int iSpin, G4int iParity,
>> 53 G4int iConjugation, G4int iIsospin,
>> 54 G4int iIsospin3, G4int gParity,
>> 55 const G4String& pType, G4int lepton,
>> 56 G4int baryon, G4int encoding,
>> 57 G4bool stable, G4double lifetime,
>> 58 G4DecayTable *decaytable )
>> 59 : G4VLepton( aName,mass,width,charge,iSpin,iParity,
>> 60 iConjugation,iIsospin,iIsospin3,gParity,pType,
>> 61 lepton,baryon,encoding,stable,lifetime,decaytable )
>> 62 {
>> 63 SetParticleSubType("e");
>> 64 }
36 65
37 #include "G4ParticleTable.hh" <<
38 #include "G4PhysicalConstants.hh" <<
39 #include "G4String.hh" <<
40 #include "G4SystemOfUnits.hh" <<
41 #include "G4Types.hh" <<
42 66
43 G4Positron* G4Positron::theInstance = nullptr; << 67 // ......................................................................
>> 68 // ... static member definitions ...
>> 69 // ......................................................................
>> 70 //
>> 71 // Arguments for constructor are as follows
>> 72 // name mass width charge
>> 73 // 2*spin parity C-conjugation
>> 74 // 2*Isospin 2*Isospin3 G-parity
>> 75 // type lepton number baryon number PDG encoding
>> 76 // stable lifetime decay table
>> 77 G4Positron G4Positron::thePositron(
>> 78 "e+", 0.51099906*MeV, 0.0*MeV, +1.*eplus,
>> 79 1, 0, 0,
>> 80 0, 0, 0,
>> 81 "lepton", -1, 0, -11,
>> 82 true, -1.0, NULL
>> 83 );
44 84
45 G4Positron* G4Positron::Definition() << 85 G4Positron* G4Positron::PositronDefinition() {return &thePositron;}
46 { <<
47 if (theInstance != nullptr) return theInstan <<
48 const G4String name = "e+"; <<
49 // search in particle table] <<
50 G4ParticleTable* pTable = G4ParticleTable::G <<
51 G4ParticleDefinition* anInstance = pTable->F <<
52 if (anInstance == nullptr) { <<
53 // create particle <<
54 // <<
55 // Arguments for constructor are as fol <<
56 // name mass <<
57 // 2*spin parity C- <<
58 // 2*Isospin 2*Isospin3 <<
59 // type lepton number ba <<
60 // stable lifetime <<
61 // shortlived subType <<
62 // use constants in CLHEP <<
63 // static const double electron_mass_c2 = <<
64 <<
65 // clang-format off <<
66 anInstance = new G4ParticleDefinition( <<
67 name, electron_mass_c2, <<
68 1, 0, 0, <<
69 0, 0, 0, <<
70 "lepton", -1, <<
71 true, -1.0, nullptr, <<
72 false, "e" <<
73 ); <<
74 // clang-format on <<
75 86
76 // Bohr Magnetron << 87 // **********************************************************************
77 G4double muB = 0.5 * eplus * hbar_Planck / << 88 // ************************* ComputeLoss ********************************
>> 89 // **********************************************************************
78 90
79 anInstance->SetPDGMagneticMoment(muB * 1.0 << 91 G4double G4Positron::ComputeLoss(G4double AtomicNumber,
>> 92 G4double KineticEnergy) const
>> 93 {
>> 94 static G4double Z;
>> 95 static G4double taul, ionpot, ionpotlog;
>> 96 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
>> 97 const G4double Tlow=10.*keV, Thigh=1.*GeV;
>> 98 static G4double bremfactor = 0.1 ;
>> 99
>> 100 // calculate dE/dx for electrons
>> 101 if( abs(AtomicNumber-Z)>0.1 )
>> 102 {
>> 103 Z = AtomicNumber;
>> 104 taul = Tlow/GetPDGMass();
>> 105 ionpot = 1.6e-5*MeV*exp(0.9*log(Z))/GetPDGMass();
>> 106 ionpotlog = log(ionpot);
>> 107 }
>> 108
>> 109
>> 110 G4double tau = KineticEnergy/GetPDGMass();
>> 111 G4double dEdx;
>> 112
>> 113 if(tau<taul)
>> 114 {
>> 115 G4double t1 = taul+1.;
>> 116 G4double t2 = taul+2.;
>> 117 G4double tsq = taul*taul;
>> 118 G4double beta2 = taul*t2/(t1*t1);
>> 119 G4double f = 2.*log(taul)
>> 120 -(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
>> 121 (t2*t2))/(t1*t1);
>> 122 dEdx = (log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
>> 123 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 124 G4double clow = dEdx*sqrt(taul);
>> 125 dEdx = clow/sqrt(KineticEnergy/GetPDGMass());
>> 126 } else {
>> 127 G4double t1 = tau+1.;
>> 128 G4double t2 = tau+2.;
>> 129 G4double tsq = tau*tau;
>> 130 G4double beta2 = tau*t2/(t1*t1);
>> 131 G4double f = 2.*log(tau)
>> 132 - (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
>> 133 (t2*t2))/(t1*t1);
>> 134 dEdx = (log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 135 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 136
>> 137 // loss from bremsstrahlung follows
>> 138 G4double cbrem = (cbr1+cbr2*Z)
>> 139 *(cbr3+cbr4*log(KineticEnergy/Thigh));
>> 140 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 141 cbrem *= bremfactor ;
>> 142 dEdx += twopi_mc2_rcl2*cbrem;
80 } 143 }
81 theInstance = static_cast<G4Positron*>(anIns << 144 return dEdx;
82 return theInstance; <<
83 } 145 }
84 146
85 G4Positron* G4Positron::PositronDefinition() << 147 // **********************************************************************
>> 148 // *********************** BuildRangeVector *****************************
>> 149 // **********************************************************************
>> 150 void G4Positron::BuildRangeVector(const G4Material* aMaterial,
>> 151 const G4LossTable* aLossTable,
>> 152 G4double maxEnergy,
>> 153 G4double aMass,
>> 154 G4PhysicsLogVector* rangeVector)
86 { 155 {
87 return Definition(); << 156 G4Electron* pElectron = G4Electron::ElectronDefinition();
>> 157 pElectron->BuildRangeVector(aMaterial,
>> 158 aLossTable,
>> 159 maxEnergy,
>> 160 aMass,
>> 161 rangeVector);
88 } 162 }
89 163
90 G4Positron* G4Positron::Positron() << 164 G4Positron* G4Positron::Positron()
91 { 165 {
92 return Definition(); << 166 return &thePositron;
93 } 167 }
94 168