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