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25 // 25 //
26 // G4MuonDecayChannel class implementation 26 // G4MuonDecayChannel class implementation
27 // 27 //
28 // Author: H.Kurashige, 30 May 1997 28 // Author: H.Kurashige, 30 May 1997
29 // Contributions: 29 // Contributions:
30 // - 2005 - M.Melissas, J.Brunner CPPM/IN2P3 30 // - 2005 - M.Melissas, J.Brunner CPPM/IN2P3
31 // Added V-A fluxes for neutrinos using a ne 31 // Added V-A fluxes for neutrinos using a new algorithm, 2005
32 // ------------------------------------------- 32 // --------------------------------------------------------------------
33 33
34 #include "G4MuonDecayChannel.hh" <<
35 <<
36 #include "G4DecayProducts.hh" <<
37 #include "G4LorentzRotation.hh" <<
38 #include "G4LorentzVector.hh" <<
39 #include "G4ParticleDefinition.hh" 34 #include "G4ParticleDefinition.hh"
40 #include "G4PhysicalConstants.hh" 35 #include "G4PhysicalConstants.hh"
41 #include "G4RotationMatrix.hh" <<
42 #include "G4SystemOfUnits.hh" 36 #include "G4SystemOfUnits.hh"
>> 37 #include "G4DecayProducts.hh"
43 #include "G4VDecayChannel.hh" 38 #include "G4VDecayChannel.hh"
>> 39 #include "G4MuonDecayChannel.hh"
44 #include "Randomize.hh" 40 #include "Randomize.hh"
>> 41 #include "G4LorentzVector.hh"
>> 42 #include "G4LorentzRotation.hh"
>> 43 #include "G4RotationMatrix.hh"
>> 44
>> 45 G4MuonDecayChannel::G4MuonDecayChannel()
>> 46 : G4VDecayChannel()
>> 47 {
>> 48 }
45 49
46 G4MuonDecayChannel::G4MuonDecayChannel(const G << 50 G4MuonDecayChannel::G4MuonDecayChannel(const G4String& theParentName,
>> 51 G4double theBR)
47 : G4VDecayChannel("Muon Decay", 1) 52 : G4VDecayChannel("Muon Decay", 1)
48 { 53 {
49 // set names for daughter particles 54 // set names for daughter particles
50 if (theParentName == "mu+") { << 55 if (theParentName == "mu+")
>> 56 {
51 SetBR(theBR); 57 SetBR(theBR);
52 SetParent("mu+"); 58 SetParent("mu+");
53 SetNumberOfDaughters(3); 59 SetNumberOfDaughters(3);
54 SetDaughter(0, "e+"); 60 SetDaughter(0, "e+");
55 SetDaughter(1, "nu_e"); 61 SetDaughter(1, "nu_e");
56 SetDaughter(2, "anti_nu_mu"); 62 SetDaughter(2, "anti_nu_mu");
57 } 63 }
58 else if (theParentName == "mu-") { << 64 else if (theParentName == "mu-")
>> 65 {
59 SetBR(theBR); 66 SetBR(theBR);
60 SetParent("mu-"); 67 SetParent("mu-");
61 SetNumberOfDaughters(3); 68 SetNumberOfDaughters(3);
62 SetDaughter(0, "e-"); 69 SetDaughter(0, "e-");
63 SetDaughter(1, "anti_nu_e"); 70 SetDaughter(1, "anti_nu_e");
64 SetDaughter(2, "nu_mu"); 71 SetDaughter(2, "nu_mu");
65 } 72 }
66 else { << 73 else
>> 74 {
67 #ifdef G4VERBOSE 75 #ifdef G4VERBOSE
68 if (GetVerboseLevel() > 0) { << 76 if (GetVerboseLevel()>0)
>> 77 {
69 G4cout << "G4MuonDecayChannel:: construc 78 G4cout << "G4MuonDecayChannel:: constructor :";
70 G4cout << " parent particle is not muon 79 G4cout << " parent particle is not muon but ";
71 G4cout << theParentName << G4endl; 80 G4cout << theParentName << G4endl;
72 } 81 }
73 #endif 82 #endif
74 } 83 }
75 } 84 }
76 85
77 G4MuonDecayChannel& G4MuonDecayChannel::operat << 86 G4MuonDecayChannel::G4MuonDecayChannel(const G4MuonDecayChannel& right)
>> 87 : G4VDecayChannel(right)
>> 88 {
>> 89 }
>> 90
>> 91 G4MuonDecayChannel::~G4MuonDecayChannel()
>> 92 {
>> 93 }
>> 94
>> 95 G4MuonDecayChannel&
>> 96 G4MuonDecayChannel::operator=(const G4MuonDecayChannel& right)
78 { 97 {
79 if (this != &right) { << 98 if (this != &right)
>> 99 {
80 kinematics_name = right.kinematics_name; 100 kinematics_name = right.kinematics_name;
81 verboseLevel = right.verboseLevel; 101 verboseLevel = right.verboseLevel;
82 rbranch = right.rbranch; 102 rbranch = right.rbranch;
83 103
84 // copy parent name 104 // copy parent name
85 parent_name = new G4String(*right.parent_n 105 parent_name = new G4String(*right.parent_name);
86 106
87 // clear daughters_name array 107 // clear daughters_name array
88 ClearDaughtersName(); 108 ClearDaughtersName();
89 109
90 // recreate array 110 // recreate array
91 numberOfDaughters = right.numberOfDaughter 111 numberOfDaughters = right.numberOfDaughters;
92 if (numberOfDaughters > 0) { << 112 if ( numberOfDaughters >0 )
93 if (daughters_name != nullptr) ClearDaug << 113 {
>> 114 if (daughters_name !=0) ClearDaughtersName();
94 daughters_name = new G4String*[numberOfD 115 daughters_name = new G4String*[numberOfDaughters];
95 // copy daughters name 116 // copy daughters name
96 for (G4int index = 0; index < numberOfDa << 117 for (G4int index=0; index < numberOfDaughters; ++index)
>> 118 {
97 daughters_name[index] = new G4String(* 119 daughters_name[index] = new G4String(*right.daughters_name[index]);
98 } 120 }
99 } 121 }
100 } 122 }
101 return *this; 123 return *this;
102 } 124 }
103 125
104 G4DecayProducts* G4MuonDecayChannel::DecayIt(G << 126 G4DecayProducts* G4MuonDecayChannel::DecayIt(G4double)
105 { 127 {
106 // this version neglects muon polarization,a << 128 // this version neglects muon polarization,and electron mass
107 // assumes the pure V-A couplin 129 // assumes the pure V-A coupling
108 // the Neutrinos are correctly 130 // the Neutrinos are correctly V-A
109 131
110 #ifdef G4VERBOSE 132 #ifdef G4VERBOSE
111 if (GetVerboseLevel() > 1) G4cout << "G4Muon << 133 if (GetVerboseLevel()>1) G4cout << "G4MuonDecayChannel::DecayIt ";
112 #endif 134 #endif
113 135
114 CheckAndFillParent(); 136 CheckAndFillParent();
115 CheckAndFillDaughters(); 137 CheckAndFillDaughters();
116 << 138
117 // parent mass 139 // parent mass
118 G4double parentmass = G4MT_parent->GetPDGMas 140 G4double parentmass = G4MT_parent->GetPDGMass();
119 const G4int N_DAUGHTER = 3; << 141 const G4int N_DAUGHTER=3;
120 142
121 // daughters'mass 143 // daughters'mass
122 G4double daughtermass[N_DAUGHTER]; << 144 G4double daughtermass[N_DAUGHTER];
123 // G4double sumofdaughtermass = 0.0; << 145 //G4double sumofdaughtermass = 0.0;
124 for (G4int index = 0; index < N_DAUGHTER; ++ << 146 for (G4int index=0; index<N_DAUGHTER; ++index)
>> 147 {
125 daughtermass[index] = G4MT_daughters[index 148 daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
126 // sumofdaughtermass += daughtermass[index << 149 //sumofdaughtermass += daughtermass[index];
127 } 150 }
128 151
129 // create parent G4DynamicParticle at rest 152 // create parent G4DynamicParticle at rest
130 G4ThreeVector dummy; 153 G4ThreeVector dummy;
131 auto parentparticle = new G4DynamicParticle( << 154 G4DynamicParticle* parentparticle
>> 155 = new G4DynamicParticle( G4MT_parent, dummy, 0.0);
132 // create G4Decayproducts 156 // create G4Decayproducts
133 auto products = new G4DecayProducts(*parentp << 157 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
134 delete parentparticle; 158 delete parentparticle;
135 159
136 // calculate daughter momentum 160 // calculate daughter momentum
137 G4double daughtermomentum[N_DAUGHTER]; 161 G4double daughtermomentum[N_DAUGHTER];
138 // calculate electron energy 162 // calculate electron energy
139 G4double xmax = (1.0 + daughtermass[0] * dau << 163 G4double xmax = (1.0+daughtermass[0]*daughtermass[0]/parentmass/parentmass);
140 G4double x; 164 G4double x;
141 << 165
142 G4double Ee, Ene; << 166 G4double Ee,Ene;
143 << 167
144 G4double gam; 168 G4double gam;
145 G4double EMax = parentmass / 2 - daughtermas << 169 G4double EMax=parentmass/2-daughtermass[0];
146 << 170
147 const std::size_t MAX_LOOP = 1000; << 171 const std::size_t MAX_LOOP=1000;
148 // Generating Random Energy << 172 //Generating Random Energy
149 for (std::size_t loop1 = 0; loop1 < MAX_LOOP << 173 for (std::size_t loop1=0; loop1<MAX_LOOP; ++loop1)
150 Ee = G4UniformRand(); << 174 {
151 for (std::size_t loop2 = 0; loop2 < MAX_LO << 175 Ee=G4UniformRand();
152 x = xmax * G4UniformRand(); << 176 for (std::size_t loop2 =0; loop2<MAX_LOOP; ++loop2)
153 gam = G4UniformRand(); << 177 {
154 if (gam <= x * (1. - x)) break; << 178 x=xmax*G4UniformRand();
>> 179 gam=G4UniformRand();
>> 180 if (gam <= x*(1.-x)) break;
155 x = xmax; 181 x = xmax;
156 } 182 }
157 Ene = x; << 183 Ene=x;
158 if (Ene >= (1. - Ee)) break; << 184 if ( Ene >= (1.-Ee)) break;
159 Ene = 1. - Ee; << 185 Ene = 1.-Ee;
160 } 186 }
161 G4double Enm = (2. - Ee - Ene); << 187 G4double Enm=(2.-Ee-Ene);
162 188
163 // initialisation of rotation parameters 189 // initialisation of rotation parameters
164 190
165 G4double costheta, sintheta, rphi, rtheta, r << 191 G4double costheta,sintheta,rphi,rtheta,rpsi;
166 costheta = 1. - 2. / Ee - 2. / Ene + 2. / En << 192 costheta= 1.-2./Ee-2./Ene+2./Ene/Ee;
167 sintheta = std::sqrt(1. - costheta * costhet << 193 sintheta=std::sqrt(1.-costheta*costheta);
168 << 194
169 rphi = twopi * G4UniformRand() * rad; << 195
170 rtheta = (std::acos(2. * G4UniformRand() - 1 << 196 rphi=twopi*G4UniformRand()*rad;
171 rpsi = twopi * G4UniformRand() * rad; << 197 rtheta=(std::acos(2.*G4UniformRand()-1.));
>> 198 rpsi=twopi*G4UniformRand()*rad;
172 199
173 G4RotationMatrix rot; 200 G4RotationMatrix rot;
174 rot.set(rphi, rtheta, rpsi); << 201 rot.set(rphi,rtheta,rpsi);
175 202
176 // electron 0 203 // electron 0
177 daughtermomentum[0] = std::sqrt(Ee * Ee * EM << 204 daughtermomentum[0]=std::sqrt(Ee*Ee*EMax*EMax+2.0*Ee*EMax * daughtermass[0]);
178 G4ThreeVector direction0(0.0, 0.0, 1.0); << 205 G4ThreeVector direction0(0.0,0.0,1.0);
179 206
180 direction0 *= rot; 207 direction0 *= rot;
181 208
182 auto daughterparticle = << 209 G4DynamicParticle* daughterparticle
183 new G4DynamicParticle(G4MT_daughters[0], d << 210 = new G4DynamicParticle (G4MT_daughters[0], direction0*daughtermomentum[0]);
184 211
185 products->PushProducts(daughterparticle); 212 products->PushProducts(daughterparticle);
186 << 213
187 // electronic neutrino 1 214 // electronic neutrino 1
188 215
189 daughtermomentum[1] = std::sqrt(Ene * Ene * << 216 daughtermomentum[1] = std::sqrt(Ene*Ene*EMax*EMax
>> 217 +2.0*Ene*EMax*daughtermass[1]);
190 G4ThreeVector direction1(sintheta, 0.0, cost 218 G4ThreeVector direction1(sintheta, 0.0, costheta);
191 219
192 direction1 *= rot; 220 direction1 *= rot;
193 221
194 auto daughterparticle1 = << 222 G4DynamicParticle* daughterparticle1
195 new G4DynamicParticle(G4MT_daughters[1], d << 223 = new G4DynamicParticle (G4MT_daughters[1], direction1*daughtermomentum[1]);
196 products->PushProducts(daughterparticle1); 224 products->PushProducts(daughterparticle1);
197 225
198 // muonnic neutrino 2 226 // muonnic neutrino 2
199 << 227
200 daughtermomentum[2] = std::sqrt(Enm * Enm * << 228 daughtermomentum[2] = std::sqrt(Enm*Enm*EMax*EMax
201 G4ThreeVector direction2(-Ene / Enm * sinthe << 229 +2.0*Enm*EMax*daughtermass[2]);
>> 230 G4ThreeVector direction2(-Ene/Enm*sintheta,0,-Ee/Enm-Ene/Enm*costheta);
202 231
203 direction2 *= rot; 232 direction2 *= rot;
204 233
205 auto daughterparticle2 = << 234 G4DynamicParticle* daughterparticle2
206 new G4DynamicParticle(G4MT_daughters[2], d << 235 = new G4DynamicParticle (G4MT_daughters[2], direction2*daughtermomentum[2]);
207 products->PushProducts(daughterparticle2); 236 products->PushProducts(daughterparticle2);
208 237
209 // output message 238 // output message
210 #ifdef G4VERBOSE 239 #ifdef G4VERBOSE
211 if (GetVerboseLevel() > 1) { << 240 if (GetVerboseLevel()>1)
>> 241 {
212 G4cout << "G4MuonDecayChannel::DecayIt()"; 242 G4cout << "G4MuonDecayChannel::DecayIt()";
213 G4cout << " create decay products in rest 243 G4cout << " create decay products in rest frame " << G4endl;
214 products->DumpInfo(); 244 products->DumpInfo();
215 } 245 }
216 #endif 246 #endif
217 return products; 247 return products;
218 } 248 }
219 249