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