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25 // 25 //
26 // G4RToEConvForPositron class implementation 26 // G4RToEConvForPositron class implementation
27 // 27 //
28 // Author: H.Kurashige, 05 October 2002 - Firs 28 // Author: H.Kurashige, 05 October 2002 - First implementation
29 // ------------------------------------------- 29 // --------------------------------------------------------------------
30 30
31 #include "G4RToEConvForPositron.hh" 31 #include "G4RToEConvForPositron.hh"
32 #include "G4ParticleDefinition.hh" 32 #include "G4ParticleDefinition.hh"
33 #include "G4ParticleTable.hh" 33 #include "G4ParticleTable.hh"
>> 34 #include "G4Material.hh"
>> 35 #include "G4PhysicsLogVector.hh"
34 36
>> 37 #include "G4ios.hh"
35 #include "G4PhysicalConstants.hh" 38 #include "G4PhysicalConstants.hh"
36 #include "G4SystemOfUnits.hh" 39 #include "G4SystemOfUnits.hh"
37 #include "G4Pow.hh" <<
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 40
41 // ------------------------------------------- 41 // --------------------------------------------------------------------
42 G4RToEConvForPositron::G4RToEConvForPositron() 42 G4RToEConvForPositron::G4RToEConvForPositron()
43 : G4VRangeToEnergyConverter() 43 : G4VRangeToEnergyConverter()
44 { 44 {
45 theParticle = G4ParticleTable::GetParticleTa 45 theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e+");
46 if (theParticle == nullptr) 46 if (theParticle == nullptr)
47 { 47 {
48 #ifdef G4VERBOSE 48 #ifdef G4VERBOSE
49 if (GetVerboseLevel()>0) 49 if (GetVerboseLevel()>0)
50 { 50 {
51 G4cout << "G4RToEConvForPositron::G4RToE 51 G4cout << "G4RToEConvForPositron::G4RToEConvForPositron() - ";
52 G4cout << "Positron is not defined !!" < 52 G4cout << "Positron is not defined !!" << G4endl;
53 } 53 }
54 #endif 54 #endif
55 } 55 }
56 else 56 else
57 { 57 {
58 fPDG = theParticle->GetPDGEncoding(); << 58 Mass = theParticle->GetPDGMass();
59 } 59 }
60 } 60 }
61 61
62 // ------------------------------------------- 62 // --------------------------------------------------------------------
63 G4RToEConvForPositron::~G4RToEConvForPositron( << 63 G4RToEConvForPositron::~G4RToEConvForPositron()
64 {} << 64 {
>> 65 }
65 66
66 // ------------------------------------------- << 67 // **********************************************************************
67 G4double G4RToEConvForPositron::ComputeValue(c << 68 // ************************* ComputeLoss ********************************
68 c << 69 // **********************************************************************
>> 70 G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
>> 71 G4double KineticEnergy)
69 { 72 {
70 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3 73 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
71 const G4double Tlow=10.*CLHEP::keV, Thigh=1. << 74 const G4double Tlow=10.*keV, Thigh=1.*GeV;
72 const G4double taul = Tlow/CLHEP::electron_m <<
73 const G4double logtaul = G4Log(taul); <<
74 const G4double taul12 = std::sqrt(taul); <<
75 const G4double bremfactor = 0.1; <<
76 <<
77 G4double Zlog = G4Pow::GetInstance()->logZ(Z <<
78 G4double ionpot = <<
79 1.6e-5*CLHEP::MeV*G4Exp(0.9*Zlog)/CLHEP::e <<
80 G4double ionpotlog = G4Log(ionpot); <<
81 75
82 G4double tau = kinEnergy/CLHEP::electron_mas << 76 // calculate dE/dx for electrons
83 G4double dEdx = 0.0; << 77 if( std::fabs(AtomicNumber-Z)>0.1 )
>> 78 {
>> 79 Z = AtomicNumber;
>> 80 taul = Tlow/Mass;
>> 81 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
>> 82 ionpotlog = std::log(ionpot);
>> 83 }
84 84
>> 85 G4double tau = KineticEnergy/Mass;
>> 86 G4double dEdx;
85 87
86 if(tau<taul) 88 if(tau<taul)
87 { 89 {
88 G4double t1 = taul+1.; 90 G4double t1 = taul+1.;
89 G4double t2 = taul+2.; 91 G4double t2 = taul+2.;
90 G4double tsq = taul*taul; 92 G4double tsq = taul*taul;
91 G4double beta2 = taul*t2/(t1*t1); 93 G4double beta2 = taul*t2/(t1*t1);
92 G4double f = 2.*logtaul - << 94 G4double f = 2.*std::log(taul)
93 (6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2 << 95 -(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2
94 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 96 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1);
95 dEdx = (G4Log(2.*taul+4.)-2.*ionpotlog+f)/ << 97 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
96 dEdx *= Z*taul12/std::sqrt(tau); << 98 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 99 G4double clow = dEdx*std::sqrt(taul);
>> 100 dEdx = clow/std::sqrt(KineticEnergy/Mass);
97 } 101 }
98 else 102 else
99 { 103 {
100 G4double t1 = tau+1.; 104 G4double t1 = tau+1.;
101 G4double t2 = tau+2.; 105 G4double t2 = tau+2.;
102 G4double tsq = tau*tau; 106 G4double tsq = tau*tau;
103 G4double beta2 = tau*t2/(t1*t1); 107 G4double beta2 = tau*t2/(t1*t1);
104 G4double f = 2.*G4Log(tau) - (6.*tau+1.5*t << 108 G4double f = 2.*std::log(tau)
105 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 109 - (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2
106 dEdx = Z*(G4Log(2.*tau+4.)-2.*ionpotlog+f) << 110 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1);
>> 111 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 112 dEdx = twopi_mc2_rcl2*Z*dEdx;
107 113
108 // loss from bremsstrahlung follows 114 // loss from bremsstrahlung follows
109 G4double cbrem = (cbr1+cbr2*Z) 115 G4double cbrem = (cbr1+cbr2*Z)
110 * (cbr3+cbr4*G4Log(kinEnerg << 116 * (cbr3+cbr4*std::log(KineticEnergy/Thigh));
111 dEdx += cbrem*Z*(Z+1.)*bremfactor*tau/beta << 117 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 118 cbrem *= bremfactor;
>> 119 dEdx += twopi_mc2_rcl2*cbrem;
112 } 120 }
113 return dEdx*CLHEP::twopi_mc2_rcl2; << 121 return dEdx;
114 } 122 }
115 <<
116 // ------------------------------------------- <<
117 123