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25 // 25 //
26 // G4PionRadiativeDecayChannel class implement 26 // G4PionRadiativeDecayChannel class implementation
27 // GEANT 4 class header file 27 // GEANT 4 class header file
28 // 28 //
29 // Author: P.Gumplinger, 30 July 2007 << 29 // Author: P.Gumplinger, 30 July 2007
30 // Reference: M. Blecher, TRIUMF/PIENU Technot 30 // Reference: M. Blecher, TRIUMF/PIENU Technote
31 // "Inclusion of pi->enug in the Mo << 31 // "Inclusion of pi->enug in the Monte Carlo"
32 // ------------------------------------------- 32 // --------------------------------------------------------------------
33 33
34 #include "G4PionRadiativeDecayChannel.hh" 34 #include "G4PionRadiativeDecayChannel.hh"
35 35
36 #include "G4DecayProducts.hh" <<
37 #include "G4LorentzVector.hh" <<
38 #include "G4PhysicalConstants.hh" 36 #include "G4PhysicalConstants.hh"
39 #include "G4SystemOfUnits.hh" 37 #include "G4SystemOfUnits.hh"
40 #include "Randomize.hh" 38 #include "Randomize.hh"
>> 39 #include "G4DecayProducts.hh"
>> 40 #include "G4LorentzVector.hh"
41 41
42 namespace 42 namespace
43 { 43 {
44 const G4double beta = 3.6612e-03; << 44 const G4double beta = 3.6612e-03;
45 const G4double cib = 1.16141e-03; << 45 const G4double cib = 1.16141e-03;
46 const G4double csdp = 3.45055e-02; << 46 const G4double csdp = 3.45055e-02;
47 const G4double csdm = 5.14122e-03; << 47 const G4double csdm = 5.14122e-03;
48 const G4double cif = 4.63543e-05; << 48 const G4double cif = 4.63543e-05;
49 const G4double cig = 1.78928e-05; << 49 const G4double cig = 1.78928e-05;
50 const G4double xl = 2. * 0.1 * MeV / 139.57 * << 50 const G4double xl = 2.*0.1*MeV/139.57*MeV;
51 const G4double yl = ((1. - xl) + std::sqrt((1 << 51 const G4double yl = ((1.-xl) + std::sqrt((1-xl)*(1-xl)+4*beta*beta))/2.;
52 << 52
53 const G4double xu = 1. - (yl - std::sqrt(yl * << 53 const G4double xu = 1. - (yl - std::sqrt(yl*yl-4.*beta*beta))/2.;
54 const G4double yu = 1. + beta * beta; << 54 const G4double yu = 1. + beta*beta;
55 << 55
56 inline G4double D2W(const G4double x, const G4 << 56 inline G4double D2W(const G4double x,const G4double y)
57 { << 57 {
58 return cib * (1. - y) * (1. + ((1. - x) * (1 << 58 return cib*(1.-y)*(1.+((1.-x)*(1.-x)))/((x*x)*(x+y-1.)) +
59 + csdp * (1. - x) * ((x + y - 1.) * ( << 59 csdp*(1.-x)*((x+y-1.)*(x+y-1.)) +
60 + cif * (x - 1.) * (1. - y) / x + cig << 60 csdm*(1.-x)*((1.-y)*(1.-y)) +
>> 61 cif*(x-1.)*(1.-y)/x +
>> 62 cig*(1.-y)*(1.-x+(x*x)/(x+y-1.))/x;
>> 63 }
>> 64
>> 65 const G4double d2wmax = D2W(xl,yl);
61 } 66 }
62 67
63 const G4double d2wmax = D2W(xl, yl); << 68 // --------------------------------------------------------------------
64 } // namespace << 69 G4PionRadiativeDecayChannel::G4PionRadiativeDecayChannel()
>> 70 : G4VDecayChannel()
>> 71 {
>> 72 }
65 73
66 G4PionRadiativeDecayChannel::G4PionRadiativeDe << 74 // --------------------------------------------------------------------
67 << 75 G4PionRadiativeDecayChannel::
>> 76 G4PionRadiativeDecayChannel(const G4String& theParentName,
>> 77 G4double theBR)
68 : G4VDecayChannel("Radiative Pion Decay", 1) 78 : G4VDecayChannel("Radiative Pion Decay", 1)
69 { 79 {
70 // set names for daughter particles 80 // set names for daughter particles
71 if (theParentName == "pi+") { << 81 if (theParentName == "pi+")
>> 82 {
72 SetBR(theBR); 83 SetBR(theBR);
73 SetParent("pi+"); 84 SetParent("pi+");
74 SetNumberOfDaughters(3); 85 SetNumberOfDaughters(3);
75 SetDaughter(0, "e+"); 86 SetDaughter(0, "e+");
76 SetDaughter(1, "gamma"); 87 SetDaughter(1, "gamma");
77 SetDaughter(2, "nu_e"); 88 SetDaughter(2, "nu_e");
78 } 89 }
79 else if (theParentName == "pi-") { << 90 else if (theParentName == "pi-")
>> 91 {
80 SetBR(theBR); 92 SetBR(theBR);
81 SetParent("pi-"); 93 SetParent("pi-");
82 SetNumberOfDaughters(3); 94 SetNumberOfDaughters(3);
83 SetDaughter(0, "e-"); 95 SetDaughter(0, "e-");
84 SetDaughter(1, "gamma"); 96 SetDaughter(1, "gamma");
85 SetDaughter(2, "anti_nu_e"); 97 SetDaughter(2, "anti_nu_e");
86 } 98 }
87 else { << 99 else
>> 100 {
88 #ifdef G4VERBOSE 101 #ifdef G4VERBOSE
89 if (GetVerboseLevel() > 0) { << 102 if (GetVerboseLevel()>0)
90 G4cout << "G4RadiativePionDecayChannel:: << 103 {
>> 104 G4cout << "G4RadiativePionDecayChannel::G4PionRadiativeDecayChannel()"
>> 105 << G4endl;
91 G4cout << "Parent particle is not charge 106 G4cout << "Parent particle is not charged pion: ";
92 G4cout << theParentName << G4endl; 107 G4cout << theParentName << G4endl;
93 } 108 }
94 #endif 109 #endif
95 } 110 }
96 } 111 }
97 112
>> 113 // --------------------------------------------------------------------
>> 114 G4PionRadiativeDecayChannel::~G4PionRadiativeDecayChannel()
>> 115 {
>> 116 }
>> 117
>> 118 // --------------------------------------------------------------------
>> 119 G4PionRadiativeDecayChannel::
>> 120 G4PionRadiativeDecayChannel(const G4PionRadiativeDecayChannel& right)
>> 121 : G4VDecayChannel(right)
>> 122 {
>> 123 }
>> 124
98 G4PionRadiativeDecayChannel& 125 G4PionRadiativeDecayChannel&
99 G4PionRadiativeDecayChannel::operator=(const G 126 G4PionRadiativeDecayChannel::operator=(const G4PionRadiativeDecayChannel& right)
100 { 127 {
101 if (this != &right) { << 128 if (this != &right)
>> 129 {
102 kinematics_name = right.kinematics_name; 130 kinematics_name = right.kinematics_name;
103 verboseLevel = right.verboseLevel; 131 verboseLevel = right.verboseLevel;
104 rbranch = right.rbranch; 132 rbranch = right.rbranch;
105 133
106 // copy parent name 134 // copy parent name
107 parent_name = new G4String(*right.parent_n 135 parent_name = new G4String(*right.parent_name);
108 136
109 // clear daughters_name array 137 // clear daughters_name array
110 ClearDaughtersName(); 138 ClearDaughtersName();
111 139
112 // recreate array 140 // recreate array
113 numberOfDaughters = right.numberOfDaughter 141 numberOfDaughters = right.numberOfDaughters;
114 if (numberOfDaughters > 0) { << 142 if ( numberOfDaughters >0 )
>> 143 {
115 if (daughters_name != nullptr) ClearDaug 144 if (daughters_name != nullptr) ClearDaughtersName();
116 daughters_name = new G4String*[numberOfD 145 daughters_name = new G4String*[numberOfDaughters];
117 // copy daughters name << 146 //copy daughters name
118 for (G4int index = 0; index < numberOfDa << 147 for (G4int index=0; index<numberOfDaughters; ++index)
>> 148 {
119 daughters_name[index] = new G4String(* 149 daughters_name[index] = new G4String(*right.daughters_name[index]);
120 } 150 }
121 } 151 }
122 } 152 }
123 return *this; 153 return *this;
124 } 154 }
125 155
126 G4DecayProducts* G4PionRadiativeDecayChannel:: << 156 // --------------------------------------------------------------------
>> 157 G4DecayProducts* G4PionRadiativeDecayChannel::DecayIt(G4double)
127 { 158 {
>> 159
128 #ifdef G4VERBOSE 160 #ifdef G4VERBOSE
129 if (GetVerboseLevel() > 1) G4cout << "G4Pion << 161 if (GetVerboseLevel()>1)
>> 162 G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
130 #endif 163 #endif
131 164
132 CheckAndFillParent(); 165 CheckAndFillParent();
133 CheckAndFillDaughters(); 166 CheckAndFillDaughters();
134 167
135 // parent mass 168 // parent mass
136 G4double parentmass = G4MT_parent->GetPDGMas 169 G4double parentmass = G4MT_parent->GetPDGMass();
137 170
138 G4double EMPI = parentmass; 171 G4double EMPI = parentmass;
139 172
140 // daughters'mass 173 // daughters'mass
141 const G4int N_DAUGHTER = 3; << 174 const G4int N_DAUGHTER=3;
142 G4double daughtermass[N_DAUGHTER]; << 175 G4double daughtermass[N_DAUGHTER];
143 // G4double sumofdaughtermass = 0.0; << 176 G4double sumofdaughtermass = 0.0;
144 for (G4int index = 0; index < N_DAUGHTER; ++ << 177 for (G4int index=0; index<N_DAUGHTER; ++index)
>> 178 {
145 daughtermass[index] = G4MT_daughters[index 179 daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
146 // sumofdaughtermass += daughtermass[index << 180 sumofdaughtermass += daughtermass[index];
147 } 181 }
148 182
149 G4double EMASS = daughtermass[0]; 183 G4double EMASS = daughtermass[0];
150 184
151 // create parent G4DynamicParticle at rest 185 // create parent G4DynamicParticle at rest
152 G4ThreeVector dummy; 186 G4ThreeVector dummy;
153 auto parentparticle = new G4DynamicParticle( << 187 G4DynamicParticle* parentparticle
>> 188 = new G4DynamicParticle( G4MT_parent, dummy, 0.0);
154 // create G4Decayproducts 189 // create G4Decayproducts
155 auto products = new G4DecayProducts(*parentp << 190 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
156 delete parentparticle; 191 delete parentparticle;
157 192
158 G4double x, y; 193 G4double x, y;
159 194
160 const std::size_t MAX_LOOP = 1000; << 195 const std::size_t MAX_LOOP=1000;
161 196
162 for (std::size_t loop_counter1 = 0; loop_cou << 197 for (std::size_t loop_counter1=0; loop_counter1<MAX_LOOP; ++loop_counter1)
163 for (std::size_t loop_counter2 = 0; loop_c << 198 {
164 x = xl + G4UniformRand() * (xu - xl); << 199 for (std::size_t loop_counter2=0; loop_counter2<MAX_LOOP; ++loop_counter2)
165 y = yl + G4UniformRand() * (yu - yl); << 200 {
166 if (x + y > 1.) break; << 201 x = xl + G4UniformRand()*(xu-xl);
>> 202 y = yl + G4UniformRand()*(yu-yl);
>> 203 if (x+y > 1.) break;
167 } 204 }
168 G4double d2w = D2W(x, y); << 205 G4double d2w = D2W(x,y);
169 if (d2w > G4UniformRand() * d2wmax) break; << 206 if (d2w > G4UniformRand()*d2wmax) break;
170 } 207 }
171 208
172 // Calculate the angle between positron and 209 // Calculate the angle between positron and photon (cosine)
173 // 210 //
174 G4double cthetaGE = << 211 G4double cthetaGE = (y*(x-2.)+2.*(1.-x+beta*beta)) /
175 (y * (x - 2.) + 2. * (1. - x + beta * beta << 212 (x*std::sqrt(y*y-4.*beta*beta));
176 213
177 G4double G = x * EMPI / 2.; << 214 G4double G = x * EMPI/2.;
178 G4double E = y * EMPI / 2.; << 215 G4double E = y * EMPI/2.;
179 216
180 if (E < EMASS) E = EMASS; 217 if (E < EMASS) E = EMASS;
181 218
182 // calculate daughter momentum 219 // calculate daughter momentum
183 G4double daughtermomentum[2]; 220 G4double daughtermomentum[2];
184 221
185 daughtermomentum[0] = std::sqrt(E * E - EMAS << 222 daughtermomentum[0] = std::sqrt(E*E - EMASS*EMASS);
186 223
187 G4double cthetaE = 2. * G4UniformRand() - 1. << 224 G4double cthetaE = 2.*G4UniformRand()-1.;
188 G4double sthetaE = std::sqrt(1. - cthetaE * << 225 G4double sthetaE = std::sqrt(1.-cthetaE*cthetaE);
189 226
190 G4double phiE = twopi * G4UniformRand() * ra << 227 G4double phiE = twopi*G4UniformRand()*rad;
191 G4double cphiE = std::cos(phiE); 228 G4double cphiE = std::cos(phiE);
192 G4double sphiE = std::sin(phiE); 229 G4double sphiE = std::sin(phiE);
193 230
194 // Coordinates of the decay positron 231 // Coordinates of the decay positron
195 // 232 //
196 G4double px = sthetaE * cphiE; << 233 G4double px = sthetaE*cphiE;
197 G4double py = sthetaE * sphiE; << 234 G4double py = sthetaE*sphiE;
198 G4double pz = cthetaE; 235 G4double pz = cthetaE;
199 236
200 G4ThreeVector direction0(px, py, pz); << 237 G4ThreeVector direction0(px,py,pz);
201 238
202 auto daughterparticle0 = << 239 G4DynamicParticle * daughterparticle0
203 new G4DynamicParticle(G4MT_daughters[0], d << 240 = new G4DynamicParticle(G4MT_daughters[0], daughtermomentum[0]*direction0);
204 241
205 products->PushProducts(daughterparticle0); 242 products->PushProducts(daughterparticle0);
206 243
207 daughtermomentum[1] = G; 244 daughtermomentum[1] = G;
208 245
209 G4double sthetaGE = std::sqrt(1. - cthetaGE << 246 G4double sthetaGE = std::sqrt(1.-cthetaGE*cthetaGE);
210 247
211 G4double phiGE = twopi * G4UniformRand() * r << 248 G4double phiGE = twopi*G4UniformRand()*rad;
212 G4double cphiGE = std::cos(phiGE); 249 G4double cphiGE = std::cos(phiGE);
213 G4double sphiGE = std::sin(phiGE); 250 G4double sphiGE = std::sin(phiGE);
214 251
215 // Coordinates of the decay gamma with respe 252 // Coordinates of the decay gamma with respect to the decay positron
216 // 253 //
217 px = sthetaGE * cphiGE; << 254 px = sthetaGE*cphiGE;
218 py = sthetaGE * sphiGE; << 255 py = sthetaGE*sphiGE;
219 pz = cthetaGE; 256 pz = cthetaGE;
220 257
221 G4ThreeVector direction1(px, py, pz); << 258 G4ThreeVector direction1(px,py,pz);
222 259
223 direction1.rotateUz(direction0); 260 direction1.rotateUz(direction0);
224 261
225 auto daughterparticle1 = << 262 G4DynamicParticle * daughterparticle1
226 new G4DynamicParticle(G4MT_daughters[1], d << 263 = new G4DynamicParticle(G4MT_daughters[1], daughtermomentum[1]*direction1);
227 264
228 products->PushProducts(daughterparticle1); 265 products->PushProducts(daughterparticle1);
229 266
230 // output message 267 // output message
231 #ifdef G4VERBOSE 268 #ifdef G4VERBOSE
232 if (GetVerboseLevel() > 1) { << 269 if (GetVerboseLevel()>1)
>> 270 {
233 G4cout << "G4PionRadiativeDecayChannel::De 271 G4cout << "G4PionRadiativeDecayChannel::DecayIt() -";
234 G4cout << " create decay products in rest 272 G4cout << " create decay products in rest frame " << G4endl;
235 products->DumpInfo(); 273 products->DumpInfo();
236 } 274 }
237 #endif 275 #endif
238 276
239 return products; 277 return products;
240 } 278 }
241 279