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25 // 25 //
26 // G4PionRadiativeDecayChannel class implement << 26 // ------------------------------------------------------------
27 // GEANT 4 class header file 27 // GEANT 4 class header file
28 // 28 //
29 // Author: P.Gumplinger, 30 July 2007 << 29 // History:
30 // Reference: M. Blecher, TRIUMF/PIENU Technot << 30 // 01 August 2007 P.Gumplinger
31 // "Inclusion of pi->enug in the Mo << 31 // Reference: TRIUMF PIENU Technote:
32 // ------------------------------------------- << 32 // M. Blecher - "Inclusion of pi->enug in MC "
>> 33 // Rate is for gammas > 100keV
>> 34 //
>> 35 // ------------------------------------------------------------
>> 36 //
>> 37 //
>> 38 //
33 39
34 #include "G4PionRadiativeDecayChannel.hh" 40 #include "G4PionRadiativeDecayChannel.hh"
35 41
>> 42 #include "Randomize.hh"
36 #include "G4DecayProducts.hh" 43 #include "G4DecayProducts.hh"
37 #include "G4LorentzVector.hh" 44 #include "G4LorentzVector.hh"
38 #include "G4PhysicalConstants.hh" <<
39 #include "G4SystemOfUnits.hh" <<
40 #include "Randomize.hh" <<
41 45
42 namespace << 46 G4PionRadiativeDecayChannel::G4PionRadiativeDecayChannel()
>> 47 : G4VDecayChannel(),
>> 48 beta(0.),cib(0.),csdp(0.),csdm(0.),cif(0.),cig(0.),
>> 49 xl(0.), yl(0.), xu(0.), yu(0.), d2wmax(0.)
43 { 50 {
44 const G4double beta = 3.6612e-03; <<
45 const G4double cib = 1.16141e-03; <<
46 const G4double csdp = 3.45055e-02; <<
47 const G4double csdm = 5.14122e-03; <<
48 const G4double cif = 4.63543e-05; <<
49 const G4double cig = 1.78928e-05; <<
50 const G4double xl = 2. * 0.1 * MeV / 139.57 * <<
51 const G4double yl = ((1. - xl) + std::sqrt((1 <<
52 <<
53 const G4double xu = 1. - (yl - std::sqrt(yl * <<
54 const G4double yu = 1. + beta * beta; <<
55 <<
56 inline G4double D2W(const G4double x, const G4 <<
57 { <<
58 return cib * (1. - y) * (1. + ((1. - x) * (1 <<
59 + csdp * (1. - x) * ((x + y - 1.) * ( <<
60 + cif * (x - 1.) * (1. - y) / x + cig <<
61 } 51 }
62 52
63 const G4double d2wmax = D2W(xl, yl); << 53 G4PionRadiativeDecayChannel::
64 } // namespace << 54 G4PionRadiativeDecayChannel(const G4String& theParentName,
65 << 55 G4double theBR)
66 G4PionRadiativeDecayChannel::G4PionRadiativeDe << 56 : G4VDecayChannel("Radiative Pion Decay",1)
67 <<
68 : G4VDecayChannel("Radiative Pion Decay", 1) <<
69 { 57 {
70 // set names for daughter particles 58 // set names for daughter particles
71 if (theParentName == "pi+") { 59 if (theParentName == "pi+") {
72 SetBR(theBR); 60 SetBR(theBR);
73 SetParent("pi+"); 61 SetParent("pi+");
74 SetNumberOfDaughters(3); 62 SetNumberOfDaughters(3);
75 SetDaughter(0, "e+"); 63 SetDaughter(0, "e+");
76 SetDaughter(1, "gamma"); 64 SetDaughter(1, "gamma");
77 SetDaughter(2, "nu_e"); 65 SetDaughter(2, "nu_e");
78 } << 66 } else if (theParentName == "pi-") {
79 else if (theParentName == "pi-") { <<
80 SetBR(theBR); 67 SetBR(theBR);
81 SetParent("pi-"); 68 SetParent("pi-");
82 SetNumberOfDaughters(3); 69 SetNumberOfDaughters(3);
83 SetDaughter(0, "e-"); 70 SetDaughter(0, "e-");
84 SetDaughter(1, "gamma"); 71 SetDaughter(1, "gamma");
85 SetDaughter(2, "anti_nu_e"); 72 SetDaughter(2, "anti_nu_e");
86 } << 73 } else {
87 else { <<
88 #ifdef G4VERBOSE 74 #ifdef G4VERBOSE
89 if (GetVerboseLevel() > 0) { << 75 if (GetVerboseLevel()>0) {
90 G4cout << "G4RadiativePionDecayChannel:: << 76 G4cout << "G4RadiativePionDecayChannel:: constructor :";
91 G4cout << "Parent particle is not charge << 77 G4cout << " parent particle is not charged pion but ";
92 G4cout << theParentName << G4endl; 78 G4cout << theParentName << G4endl;
93 } 79 }
94 #endif 80 #endif
95 } 81 }
>> 82
>> 83 beta = 3.6612e-03;
>> 84
>> 85 cib = 1.16141e-03;
>> 86 csdp = 3.45055e-02;
>> 87 csdm = 5.14122e-03;
>> 88 cif = 4.63543e-05;
>> 89 cig = 1.78928e-05;
>> 90
>> 91 xl = 2.*0.1*MeV/139.57*MeV;
>> 92 yl = ((1.-xl) + std::sqrt((1-xl)*(1-xl)+4*beta*beta))/2.;
>> 93
>> 94 xu = 1. - (yl - std::sqrt(yl*yl-4.*beta*beta))/2.;
>> 95 yu = 1. + beta*beta;
>> 96
>> 97 d2wmax = D2W(xl,yl);
>> 98
>> 99 }
>> 100
>> 101 G4PionRadiativeDecayChannel::~G4PionRadiativeDecayChannel()
>> 102 {
>> 103 }
>> 104 G4PionRadiativeDecayChannel::G4PionRadiativeDecayChannel(const G4PionRadiativeDecayChannel &right)
>> 105 :G4VDecayChannel(right),
>> 106 beta(right.beta),cib(right.cib),csdp(right.csdp),
>> 107 csdm(right.csdm),cif(right.cif),cig(right.cig),
>> 108 xl(right.xl), yl(right.yl), xu(right.xu), yu(right.yu),
>> 109 d2wmax(right.d2wmax)
>> 110 {
96 } 111 }
97 112
98 G4PionRadiativeDecayChannel& << 113 G4PionRadiativeDecayChannel & G4PionRadiativeDecayChannel::operator=(const G4PionRadiativeDecayChannel & right)
99 G4PionRadiativeDecayChannel::operator=(const G <<
100 { 114 {
101 if (this != &right) { << 115 if (this != &right) {
102 kinematics_name = right.kinematics_name; 116 kinematics_name = right.kinematics_name;
103 verboseLevel = right.verboseLevel; 117 verboseLevel = right.verboseLevel;
104 rbranch = right.rbranch; 118 rbranch = right.rbranch;
105 119
106 // copy parent name 120 // copy parent name
107 parent_name = new G4String(*right.parent_n 121 parent_name = new G4String(*right.parent_name);
108 122
109 // clear daughters_name array 123 // clear daughters_name array
110 ClearDaughtersName(); 124 ClearDaughtersName();
111 125
112 // recreate array 126 // recreate array
113 numberOfDaughters = right.numberOfDaughter 127 numberOfDaughters = right.numberOfDaughters;
114 if (numberOfDaughters > 0) { << 128 if ( numberOfDaughters >0 ) {
115 if (daughters_name != nullptr) ClearDaug << 129 if (daughters_name !=0) ClearDaughtersName();
116 daughters_name = new G4String*[numberOfD 130 daughters_name = new G4String*[numberOfDaughters];
117 // copy daughters name << 131 //copy daughters name
118 for (G4int index = 0; index < numberOfDa << 132 for (G4int index=0; index < numberOfDaughters; index++) {
119 daughters_name[index] = new G4String(* << 133 daughters_name[index] = new G4String(*right.daughters_name[index]);
120 } 134 }
121 } 135 }
>> 136 beta = right.beta;
>> 137 cib = right.cib;
>> 138 csdp = right.csdp;
>> 139 csdm = right.csdm;
>> 140 cif = right.cif;
>> 141 cig = right.cig;
>> 142 xl = right.xl;
>> 143 yl = right.yl;
>> 144 xu = right.xu;
>> 145 yu = right.yu;
>> 146 d2wmax = right.d2wmax;
122 } 147 }
123 return *this; 148 return *this;
124 } 149 }
125 150
126 G4DecayProducts* G4PionRadiativeDecayChannel:: << 151 G4DecayProducts *G4PionRadiativeDecayChannel::DecayIt(G4double)
127 { 152 {
>> 153
128 #ifdef G4VERBOSE 154 #ifdef G4VERBOSE
129 if (GetVerboseLevel() > 1) G4cout << "G4Pion << 155 if (GetVerboseLevel()>1)
>> 156 G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
130 #endif 157 #endif
131 158
132 CheckAndFillParent(); << 159 if (parent == 0) FillParent();
133 CheckAndFillDaughters(); << 160 if (daughters == 0) FillDaughters();
134 161
135 // parent mass 162 // parent mass
136 G4double parentmass = G4MT_parent->GetPDGMas << 163 G4double parentmass = parent->GetPDGMass();
137 164
138 G4double EMPI = parentmass; 165 G4double EMPI = parentmass;
139 166
140 // daughters'mass << 167 //daughters'mass
141 const G4int N_DAUGHTER = 3; << 168 G4double daughtermass[3];
142 G4double daughtermass[N_DAUGHTER]; << 169 G4double sumofdaughtermass = 0.0;
143 // G4double sumofdaughtermass = 0.0; << 170 for (G4int index=0; index<3; index++){
144 for (G4int index = 0; index < N_DAUGHTER; ++ << 171 daughtermass[index] = daughters[index]->GetPDGMass();
145 daughtermass[index] = G4MT_daughters[index << 172 sumofdaughtermass += daughtermass[index];
146 // sumofdaughtermass += daughtermass[index <<
147 } 173 }
148 174
149 G4double EMASS = daughtermass[0]; 175 G4double EMASS = daughtermass[0];
150 176
151 // create parent G4DynamicParticle at rest << 177 //create parent G4DynamicParticle at rest
152 G4ThreeVector dummy; 178 G4ThreeVector dummy;
153 auto parentparticle = new G4DynamicParticle( << 179 G4DynamicParticle * parentparticle =
154 // create G4Decayproducts << 180 new G4DynamicParticle( parent, dummy, 0.0);
155 auto products = new G4DecayProducts(*parentp << 181 //create G4Decayproducts
>> 182 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
156 delete parentparticle; 183 delete parentparticle;
157 184
158 G4double x, y; << 185 G4double x, y, d2w;
159 186
160 const std::size_t MAX_LOOP = 1000; << 187 do {
161 188
162 for (std::size_t loop_counter1 = 0; loop_cou << 189 do {
163 for (std::size_t loop_counter2 = 0; loop_c << 190
164 x = xl + G4UniformRand() * (xu - xl); << 191 x = xl + G4UniformRand()*(xu-xl);
165 y = yl + G4UniformRand() * (yu - yl); << 192 y = yl + G4UniformRand()*(yu-yl);
166 if (x + y > 1.) break; << 193
167 } << 194 } while (x+y <= 1.);
168 G4double d2w = D2W(x, y); << 195
169 if (d2w > G4UniformRand() * d2wmax) break; << 196 d2w = D2W(x,y);
170 } << 197
>> 198 } while (d2w <= G4UniformRand()*d2wmax);
171 199
172 // Calculate the angle between positron and << 200 //-----------------------------------------------------------------------
173 // << 201 //
174 G4double cthetaGE = << 202 // Calculate the angle between positron and photon (cosine)
175 (y * (x - 2.) + 2. * (1. - x + beta * beta << 203 //
>> 204 G4double cthetaGE = (y*(x-2.)+2.*(1.-x+beta*beta)) /
>> 205 (x*std::sqrt(y*y-4.*beta*beta));
176 206
177 G4double G = x * EMPI / 2.; << 207 //
178 G4double E = y * EMPI / 2.; << 208 //-----------------------------------------------------------------------
>> 209 //
>> 210 G4double G = x * EMPI/2.;
>> 211 G4double E = y * EMPI/2.;
>> 212 //
>> 213 //-----------------------------------------------------------------------
>> 214 //
179 215
180 if (E < EMASS) E = EMASS; 216 if (E < EMASS) E = EMASS;
181 217
182 // calculate daughter momentum 218 // calculate daughter momentum
183 G4double daughtermomentum[2]; 219 G4double daughtermomentum[2];
184 220
185 daughtermomentum[0] = std::sqrt(E * E - EMAS << 221 daughtermomentum[0] = std::sqrt(E*E - EMASS*EMASS);
186 222
187 G4double cthetaE = 2. * G4UniformRand() - 1. << 223 G4double cthetaE = 2.*G4UniformRand()-1.;
188 G4double sthetaE = std::sqrt(1. - cthetaE * << 224 G4double sthetaE = std::sqrt(1.-cthetaE*cthetaE);
189 225
190 G4double phiE = twopi * G4UniformRand() * ra << 226 G4double phiE = twopi*G4UniformRand()*rad;
191 G4double cphiE = std::cos(phiE); 227 G4double cphiE = std::cos(phiE);
192 G4double sphiE = std::sin(phiE); 228 G4double sphiE = std::sin(phiE);
193 229
194 // Coordinates of the decay positron << 230 //Coordinates of the decay positron
195 // << 231
196 G4double px = sthetaE * cphiE; << 232 G4double px = sthetaE*cphiE;
197 G4double py = sthetaE * sphiE; << 233 G4double py = sthetaE*sphiE;
198 G4double pz = cthetaE; 234 G4double pz = cthetaE;
199 235
200 G4ThreeVector direction0(px, py, pz); << 236 G4ThreeVector direction0(px,py,pz);
201 237
202 auto daughterparticle0 = << 238 G4DynamicParticle * daughterparticle0
203 new G4DynamicParticle(G4MT_daughters[0], d << 239 = new G4DynamicParticle( daughters[0], daughtermomentum[0]*direction0);
204 240
205 products->PushProducts(daughterparticle0); 241 products->PushProducts(daughterparticle0);
206 242
207 daughtermomentum[1] = G; 243 daughtermomentum[1] = G;
208 244
209 G4double sthetaGE = std::sqrt(1. - cthetaGE << 245 G4double sthetaGE = std::sqrt(1.-cthetaGE*cthetaGE);
210 246
211 G4double phiGE = twopi * G4UniformRand() * r << 247 G4double phiGE = twopi*G4UniformRand()*rad;
212 G4double cphiGE = std::cos(phiGE); 248 G4double cphiGE = std::cos(phiGE);
213 G4double sphiGE = std::sin(phiGE); 249 G4double sphiGE = std::sin(phiGE);
214 250
215 // Coordinates of the decay gamma with respe << 251 //Coordinates of the decay gamma with respect to the decay positron
216 // << 252
217 px = sthetaGE * cphiGE; << 253 px = sthetaGE*cphiGE;
218 py = sthetaGE * sphiGE; << 254 py = sthetaGE*sphiGE;
219 pz = cthetaGE; 255 pz = cthetaGE;
220 256
221 G4ThreeVector direction1(px, py, pz); << 257 G4ThreeVector direction1(px,py,pz);
222 258
223 direction1.rotateUz(direction0); 259 direction1.rotateUz(direction0);
224 260
225 auto daughterparticle1 = << 261 G4DynamicParticle * daughterparticle1
226 new G4DynamicParticle(G4MT_daughters[1], d << 262 = new G4DynamicParticle( daughters[1], daughtermomentum[1]*direction1);
227 263
228 products->PushProducts(daughterparticle1); 264 products->PushProducts(daughterparticle1);
229 265
230 // output message << 266 // output message
231 #ifdef G4VERBOSE 267 #ifdef G4VERBOSE
232 if (GetVerboseLevel() > 1) { << 268 if (GetVerboseLevel()>1) {
233 G4cout << "G4PionRadiativeDecayChannel::De << 269 G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
234 G4cout << " create decay products in rest << 270 G4cout << " create decay products in rest frame " <<G4endl;
235 products->DumpInfo(); 271 products->DumpInfo();
236 } 272 }
237 #endif 273 #endif
238 274
239 return products; 275 return products;
>> 276
240 } 277 }
241 278