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25 // 25 //
>> 26 // $Id: G4DeltaAngle.cc 68380 2013-03-22 18:39:29Z vnivanch $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4DeltaAngle 33 // File name: G4DeltaAngle
33 // 34 //
34 // Author: Vladimir Ivantcheko 35 // Author: Vladimir Ivantcheko
35 // 36 //
36 // Creation date: 23 August 2013 37 // Creation date: 23 August 2013
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 40 //
40 // Class Description: 41 // Class Description:
41 // 42 //
42 // Delta-electron Angular Distribution Generat 43 // Delta-electron Angular Distribution Generation
43 // 44 //
44 // Class Description: End 45 // Class Description: End
45 // 46 //
46 // ------------------------------------------- 47 // -------------------------------------------------------------------
47 // 48 //
48 49
49 #include "G4DeltaAngle.hh" 50 #include "G4DeltaAngle.hh"
50 #include "G4PhysicalConstants.hh" 51 #include "G4PhysicalConstants.hh"
51 #include "Randomize.hh" 52 #include "Randomize.hh"
52 #include "G4ParticleDefinition.hh" 53 #include "G4ParticleDefinition.hh"
53 #include "G4Electron.hh" 54 #include "G4Electron.hh"
54 #include "G4AtomicShells.hh" 55 #include "G4AtomicShells.hh"
55 #include "G4SystemOfUnits.hh" <<
56 #include "G4Log.hh" 56 #include "G4Log.hh"
57 57
58 using namespace std; 58 using namespace std;
59 59
60 G4DeltaAngle::G4DeltaAngle(const G4String&) 60 G4DeltaAngle::G4DeltaAngle(const G4String&)
61 : G4VEmAngularDistribution("deltaVI") 61 : G4VEmAngularDistribution("deltaVI")
62 { 62 {
63 fElectron = G4Electron::Electron(); 63 fElectron = G4Electron::Electron();
64 nprob = 26; 64 nprob = 26;
65 fShellIdx = -1; <<
66 prob.resize(nprob,0.0); 65 prob.resize(nprob,0.0);
67 } 66 }
68 67
69 G4DeltaAngle::~G4DeltaAngle() = default; << 68 G4DeltaAngle::~G4DeltaAngle()
70 << 69 {}
71 G4ThreeVector& <<
72 G4DeltaAngle::SampleDirectionForShell(const G4 <<
73 G4double kinEner <<
74 const G4Material <<
75 { <<
76 fShellIdx = idx; <<
77 return SampleDirection(dp, kinEnergyFinal,Z, <<
78 } <<
79 70
80 G4ThreeVector& 71 G4ThreeVector&
81 G4DeltaAngle::SampleDirection(const G4DynamicP 72 G4DeltaAngle::SampleDirection(const G4DynamicParticle* dp,
82 G4double kinEner << 73 G4double kinEnergyFinal, G4int Z,
83 const G4Material << 74 const G4Material*)
84 { 75 {
85 G4int nShells = G4AtomicShells::GetNumberOfS 76 G4int nShells = G4AtomicShells::GetNumberOfShells(Z);
86 G4int idx = fShellIdx; << 77 if(nShells> nprob) {
87 << 78 nprob = nShells;
88 // if idx is not properly defined sample she << 79 prob.resize(nprob,0.0);
89 if(idx < 0 || idx >= nShells) { << 80 }
90 if(nShells> nprob) { << 81 G4int idx;
91 nprob = nShells; << 82 G4double sum = 0.0;
92 prob.resize(nprob,0.0); << 83 for(idx=0; idx<nShells; ++idx) {
93 } << 84 sum += G4AtomicShells::GetNumberOfElectrons(Z, idx)
94 G4double sum = 0.0; << 85 /G4AtomicShells::GetBindingEnergy(Z, idx);
95 for(idx=0; idx<nShells; ++idx) { << 86 prob[idx] = sum;
96 sum += G4AtomicShells::GetNumberOfElectr << 87 }
97 /G4AtomicShells::GetBindingEnergy(Z, i << 88 sum *= G4UniformRand();
98 prob[idx] = sum; << 89 for(idx=0; idx<nShells; ++idx) {
99 } << 90 if(sum <= prob[idx]) { break; }
100 sum *= G4UniformRand(); <<
101 for(idx=0; idx<nShells; ++idx) { <<
102 if(sum <= prob[idx]) { break; } <<
103 } <<
104 } 91 }
105 G4double bindingEnergy = G4AtomicShells::Get 92 G4double bindingEnergy = G4AtomicShells::GetBindingEnergy(Z, idx);
106 G4double cost; << 93 G4double mass = dp->GetParticleDefinition()->GetPDGMass();
107 /* << 94
108 G4cout << "E(keV)= " << kinEnergyFinal/keV << 95 G4ThreeVector bst(0.0,0.0,0.0);
109 << " Ebind(keV)= " << bindingEnergy << 96 G4double cost, en, mom;
110 << " idx= " << idx << " nShells= " << << 97
111 */ <<
112 G4int n = 0; <<
113 G4bool isOK = false; <<
114 static const G4int nmax = 100; <<
115 do { 98 do {
116 ++n; << 99
117 // the atomic electron 100 // the atomic electron
118 G4double x = -G4Log(G4UniformRand()); 101 G4double x = -G4Log(G4UniformRand());
119 G4double eKinEnergy = bindingEnergy*x; 102 G4double eKinEnergy = bindingEnergy*x;
120 G4double ePotEnergy = bindingEnergy*(1.0 + 103 G4double ePotEnergy = bindingEnergy*(1.0 + x);
121 G4double e = kinEnergyFinal + ePotEnergy + 104 G4double e = kinEnergyFinal + ePotEnergy + electron_mass_c2;
122 G4double p = sqrt((e + electron_mass_c2)*( <<
123 105
124 G4double totEnergy = dp->GetTotalEnergy(); 106 G4double totEnergy = dp->GetTotalEnergy();
125 G4double totMomentum = dp->GetTotalMomentu 107 G4double totMomentum = dp->GetTotalMomentum();
126 if(dp->GetParticleDefinition() == fElectro 108 if(dp->GetParticleDefinition() == fElectron) {
127 totEnergy += ePotEnergy; 109 totEnergy += ePotEnergy;
128 totMomentum = sqrt((totEnergy + electron 110 totMomentum = sqrt((totEnergy + electron_mass_c2)
129 *(totEnergy - electro << 111 *(totEnergy - electron_mass_c2));
130 } 112 }
131 113
132 G4double eTotEnergy = eKinEnergy + electro << 114 G4double eTotMomentum = sqrt(eKinEnergy*(eKinEnergy + 2*electron_mass_c2));
133 G4double eTotMomentum = sqrt(eKinEnergy*(e << 115 G4double phi = G4UniformRand()*twopi;
134 G4double costet = 2*G4UniformRand() - 1; 116 G4double costet = 2*G4UniformRand() - 1;
135 G4double sintet = sqrt((1 - costet)*(1 + c 117 G4double sintet = sqrt((1 - costet)*(1 + costet));
>> 118
>> 119 G4LorentzVector lv0(eTotMomentum*sintet*cos(phi),
>> 120 eTotMomentum*sintet*sin(phi),
>> 121 eTotMomentum*costet + totMomentum,
>> 122 eKinEnergy + electron_mass_c2 + totEnergy);
>> 123 bst = lv0.boostVector();
>> 124
>> 125 G4double m0 = lv0.mag();
>> 126 G4double bet = lv0.beta();
>> 127 G4double gam = lv0.gamma();
>> 128
>> 129 en = 0.5*(m0*m0 - mass*mass + electron_mass_c2*electron_mass_c2)/m0;
>> 130 mom = sqrt((en + electron_mass_c2)*(en - electron_mass_c2));
>> 131
>> 132 cost= (e/gam - en)/(mom*bet);
>> 133
>> 134 //G4cout << "e= " << e << " gam= " << gam << " en= " << en
>> 135 // << " mom= " << mom << " beta= " << bet << " cost= " << cost
>> 136 // << G4endl;
136 137
137 cost = 1.0; << 138 } while(std::fabs(cost) > 1.0);
138 if(n >= nmax) { <<
139 /* <<
140 G4ExceptionDescription ed; <<
141 ed << "### G4DeltaAngle Warning: " << n <<
142 << " iterations - stop the loop with <<
143 << " for " << dp->GetDefinition()->Ge <<
144 << " Ekin(MeV)= " << dp->GetKineticEn <<
145 << " Efinal(MeV)= " << kinEnergyFinal <<
146 << " Ebinding(MeV)= " << bindingEnerg <<
147 G4Exception("G4DeltaAngle::SampleDirecti <<
148 JustWarning, ed,""); <<
149 */ <<
150 if(0.0 == bindingEnergy) { isOK = true; <<
151 bindingEnergy = 0.0; <<
152 } <<
153 <<
154 G4double x0 = p*(totMomentum + eTotMomentu <<
155 /* <<
156 G4cout << " x0= " << x0 << " p= " << p <<
157 << " ptot= " << totMomentum << " p <<
158 << " e= " << e << " totMom= " << t <<
159 << G4endl; <<
160 */ <<
161 if(x0 > 0.0) { <<
162 G4double x1 = p*eTotMomentum*sintet; <<
163 G4double x2 = totEnergy*(eTotEnergy - e) <<
164 - totMomentum*eTotMomentum*costet + el <<
165 G4double y = -x2/x0; <<
166 if(std::abs(y) <= 1.0) { <<
167 cost = -(x2 + x1*sqrt(1. - y*y))/x0; <<
168 if(std::abs(cost) <= 1.0) { isOK = tru <<
169 else { cost = 1.0; } <<
170 } <<
171 <<
172 /* <<
173 G4cout << " Ekin(MeV)= " << dp->GetKinet <<
174 << " e1(keV)= " << eKinEnergy/ke <<
175 << " e2(keV)= " << (e - electron_ <<
176 << " 1-cost= " << 1-cost <<
177 << " x0= " << x0 << " x1= " << x1 <<
178 << G4endl; <<
179 */ <<
180 } <<
181 <<
182 // Loop checking, 03-Aug-2015, Vladimir Iv <<
183 } while(!isOK); <<
184 139
185 G4double sint = sqrt((1 - cost)*(1 + cost)); 140 G4double sint = sqrt((1 - cost)*(1 + cost));
186 G4double phi = twopi*G4UniformRand(); 141 G4double phi = twopi*G4UniformRand();
187 142
188 fLocalDirection.set(sint*cos(phi), sint*sin( << 143 G4LorentzVector lv1(sint*std::cos(phi)*mom, sint*std::sin(phi)*mom,
>> 144 mom*cost, en);
>> 145 lv1.boost(bst);
>> 146
>> 147 fLocalDirection.set(lv1.x(), lv1.y(), lv1.z());
>> 148 fLocalDirection = fLocalDirection.unit();
189 fLocalDirection.rotateUz(dp->GetMomentumDire 149 fLocalDirection.rotateUz(dp->GetMomentumDirection());
190 150
191 return fLocalDirection; 151 return fLocalDirection;
192 } 152 }
>> 153
>> 154 void G4DeltaAngle::PrintGeneratorInformation() const
>> 155 {}
193 156