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25 // 25 //
26 // G4MuonDecayChannel class implementation <<
27 // 26 //
28 // Author: H.Kurashige, 30 May 1997 << 27 // $Id: G4MuonDecayChannel.cc,v 1.17 2006/06/29 19:25:34 gunter Exp $
29 // Contributions: << 28 // GEANT4 tag $Name: geant4-08-03-patch-02 $
30 // - 2005 - M.Melissas, J.Brunner CPPM/IN2P3 << 29 //
31 // Added V-A fluxes for neutrinos using a ne << 30 //
32 // ------------------------------------------- << 31 // ------------------------------------------------------------
33 << 32 // GEANT 4 class header file
34 #include "G4MuonDecayChannel.hh" << 33 //
>> 34 // History: first implementation, based on object model of
>> 35 // 30 May 1997 H.Kurashige
>> 36 //
>> 37 // Fix bug in calcuration of electron energy in DecayIt 28 Feb. 01 H.Kurashige
>> 38 //2005
>> 39 // M. Melissas ( melissas AT cppm.in2p3.fr)
>> 40 // J. Brunner ( brunner AT cppm.in2p3.fr)
>> 41 // Adding V-A fluxes for neutrinos using a new algortithm :
>> 42 // ------------------------------------------------------------
35 43
36 #include "G4DecayProducts.hh" <<
37 #include "G4LorentzRotation.hh" <<
38 #include "G4LorentzVector.hh" <<
39 #include "G4ParticleDefinition.hh" 44 #include "G4ParticleDefinition.hh"
40 #include "G4PhysicalConstants.hh" << 45 #include "G4DecayProducts.hh"
41 #include "G4RotationMatrix.hh" <<
42 #include "G4SystemOfUnits.hh" <<
43 #include "G4VDecayChannel.hh" 46 #include "G4VDecayChannel.hh"
>> 47 #include "G4MuonDecayChannel.hh"
44 #include "Randomize.hh" 48 #include "Randomize.hh"
>> 49 #include "G4LorentzVector.hh"
>> 50 #include "G4LorentzRotation.hh"
>> 51 #include "G4RotationMatrix.hh"
>> 52
45 53
46 G4MuonDecayChannel::G4MuonDecayChannel(const G << 54 G4MuonDecayChannel::G4MuonDecayChannel(const G4String& theParentName,
47 : G4VDecayChannel("Muon Decay", 1) << 55 G4double theBR)
>> 56 :G4VDecayChannel("Muon Decay",1)
48 { 57 {
49 // set names for daughter particles 58 // set names for daughter particles
50 if (theParentName == "mu+") { 59 if (theParentName == "mu+") {
51 SetBR(theBR); 60 SetBR(theBR);
52 SetParent("mu+"); 61 SetParent("mu+");
53 SetNumberOfDaughters(3); 62 SetNumberOfDaughters(3);
54 SetDaughter(0, "e+"); 63 SetDaughter(0, "e+");
55 SetDaughter(1, "nu_e"); 64 SetDaughter(1, "nu_e");
56 SetDaughter(2, "anti_nu_mu"); 65 SetDaughter(2, "anti_nu_mu");
57 } << 66 } else if (theParentName == "mu-") {
58 else if (theParentName == "mu-") { <<
59 SetBR(theBR); 67 SetBR(theBR);
60 SetParent("mu-"); 68 SetParent("mu-");
61 SetNumberOfDaughters(3); 69 SetNumberOfDaughters(3);
62 SetDaughter(0, "e-"); 70 SetDaughter(0, "e-");
63 SetDaughter(1, "anti_nu_e"); 71 SetDaughter(1, "anti_nu_e");
64 SetDaughter(2, "nu_mu"); 72 SetDaughter(2, "nu_mu");
65 } << 73 } else {
66 else { <<
67 #ifdef G4VERBOSE 74 #ifdef G4VERBOSE
68 if (GetVerboseLevel() > 0) { << 75 if (GetVerboseLevel()>0) {
69 G4cout << "G4MuonDecayChannel:: construc 76 G4cout << "G4MuonDecayChannel:: constructor :";
70 G4cout << " parent particle is not muon 77 G4cout << " parent particle is not muon but ";
71 G4cout << theParentName << G4endl; 78 G4cout << theParentName << G4endl;
72 } 79 }
73 #endif 80 #endif
74 } 81 }
75 } 82 }
76 83
77 G4MuonDecayChannel& G4MuonDecayChannel::operat << 84 G4MuonDecayChannel::~G4MuonDecayChannel()
78 { 85 {
79 if (this != &right) { <<
80 kinematics_name = right.kinematics_name; <<
81 verboseLevel = right.verboseLevel; <<
82 rbranch = right.rbranch; <<
83 <<
84 // copy parent name <<
85 parent_name = new G4String(*right.parent_n <<
86 <<
87 // clear daughters_name array <<
88 ClearDaughtersName(); <<
89 <<
90 // recreate array <<
91 numberOfDaughters = right.numberOfDaughter <<
92 if (numberOfDaughters > 0) { <<
93 if (daughters_name != nullptr) ClearDaug <<
94 daughters_name = new G4String*[numberOfD <<
95 // copy daughters name <<
96 for (G4int index = 0; index < numberOfDa <<
97 daughters_name[index] = new G4String(* <<
98 } <<
99 } <<
100 } <<
101 return *this; <<
102 } 86 }
103 87
104 G4DecayProducts* G4MuonDecayChannel::DecayIt(G << 88 G4DecayProducts *G4MuonDecayChannel::DecayIt(G4double)
105 { 89 {
106 // this version neglects muon polarization,a << 90 // this version neglects muon polarization,and electron mass
107 // assumes the pure V-A couplin 91 // assumes the pure V-A coupling
108 // the Neutrinos are correctly << 92 // the Neutrinos are correctly V-A.
109 <<
110 #ifdef G4VERBOSE 93 #ifdef G4VERBOSE
111 if (GetVerboseLevel() > 1) G4cout << "G4Muon << 94 if (GetVerboseLevel()>1) G4cout << "G4MuonDecayChannel::DecayIt ";
112 #endif 95 #endif
113 96
114 CheckAndFillParent(); << 97 if (parent == 0) FillParent();
115 CheckAndFillDaughters(); << 98 if (daughters == 0) FillDaughters();
116 << 99
117 // parent mass 100 // parent mass
118 G4double parentmass = G4MT_parent->GetPDGMas << 101 G4double parentmass = parent->GetPDGMass();
119 const G4int N_DAUGHTER = 3; <<
120 102
121 // daughters'mass << 103 //daughters'mass
122 G4double daughtermass[N_DAUGHTER]; << 104 G4double daughtermass[3];
123 // G4double sumofdaughtermass = 0.0; << 105 G4double sumofdaughtermass = 0.0;
124 for (G4int index = 0; index < N_DAUGHTER; ++ << 106 for (G4int index=0; index<3; index++){
125 daughtermass[index] = G4MT_daughters[index << 107 daughtermass[index] = daughters[index]->GetPDGMass();
126 // sumofdaughtermass += daughtermass[index << 108 sumofdaughtermass += daughtermass[index];
127 } 109 }
128 110
129 // create parent G4DynamicParticle at rest << 111 //create parent G4DynamicParticle at rest
130 G4ThreeVector dummy; 112 G4ThreeVector dummy;
131 auto parentparticle = new G4DynamicParticle( << 113 G4DynamicParticle * parentparticle = new G4DynamicParticle( parent, dummy, 0.0);
132 // create G4Decayproducts << 114 //create G4Decayproducts
133 auto products = new G4DecayProducts(*parentp << 115 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
134 delete parentparticle; 116 delete parentparticle;
135 117
136 // calculate daughter momentum 118 // calculate daughter momentum
137 G4double daughtermomentum[N_DAUGHTER]; << 119 G4double daughtermomentum[3];
138 // calculate electron energy << 120 // calcurate electron energy
139 G4double xmax = (1.0 + daughtermass[0] * dau << 121 G4double xmax = (1.0+daughtermass[0]*daughtermass[0]/parentmass/parentmass);
140 G4double x; 122 G4double x;
141 << 123
142 G4double Ee, Ene; << 124 G4double Ee,Ene;
143 << 125
144 G4double gam; 126 G4double gam;
145 G4double EMax = parentmass / 2 - daughtermas << 127 G4double EMax=parentmass/2-daughtermass[0];
146 << 128
147 const std::size_t MAX_LOOP = 1000; << 129
148 // Generating Random Energy << 130 //Generating Random Energy
149 for (std::size_t loop1 = 0; loop1 < MAX_LOOP << 131 do {
150 Ee = G4UniformRand(); << 132 Ee=G4UniformRand();
151 for (std::size_t loop2 = 0; loop2 < MAX_LO << 133 do{
152 x = xmax * G4UniformRand(); << 134 x=xmax*G4UniformRand();
153 gam = G4UniformRand(); << 135 gam=G4UniformRand();
154 if (gam <= x * (1. - x)) break; << 136 }while (gam >x*(1.-x));
155 x = xmax; << 137 Ene=x;
156 } << 138 } while ( Ene < (1.-Ee));
157 Ene = x; << 139 G4double Enm=(2.-Ee-Ene);
158 if (Ene >= (1. - Ee)) break; << 140
159 Ene = 1. - Ee; << 141
160 } << 142 //initialisation of rotation parameters
161 G4double Enm = (2. - Ee - Ene); << 143
162 << 144 G4double costheta,sintheta,rphi,rtheta,rpsi;
163 // initialisation of rotation parameters << 145 costheta= 1.-2./Ee-2./Ene+2./Ene/Ee;
164 << 146 sintheta=std::sqrt(1.-costheta*costheta);
165 G4double costheta, sintheta, rphi, rtheta, r << 147
166 costheta = 1. - 2. / Ee - 2. / Ene + 2. / En << 148
167 sintheta = std::sqrt(1. - costheta * costhet << 149 rphi=twopi*G4UniformRand()*rad;
168 << 150 rtheta=(std::acos(2.*G4UniformRand()-1.));
169 rphi = twopi * G4UniformRand() * rad; << 151 rpsi=twopi*G4UniformRand()*rad;
170 rtheta = (std::acos(2. * G4UniformRand() - 1 <<
171 rpsi = twopi * G4UniformRand() * rad; <<
172 152
173 G4RotationMatrix rot; 153 G4RotationMatrix rot;
174 rot.set(rphi, rtheta, rpsi); << 154 rot.set(rphi,rtheta,rpsi);
175 155
176 // electron 0 << 156 //electron 0
177 daughtermomentum[0] = std::sqrt(Ee * Ee * EM << 157 daughtermomentum[0]=std::sqrt(Ee*Ee*EMax*EMax+2.0*Ee*EMax * daughtermass[0]);
178 G4ThreeVector direction0(0.0, 0.0, 1.0); << 158 G4ThreeVector direction0(0.0,0.0,1.0);
179 159
180 direction0 *= rot; 160 direction0 *= rot;
181 161
182 auto daughterparticle = << 162 G4DynamicParticle * daughterparticle = new G4DynamicParticle ( daughters[0], direction0 * daughtermomentum[0]);
183 new G4DynamicParticle(G4MT_daughters[0], d <<
184 163
185 products->PushProducts(daughterparticle); 164 products->PushProducts(daughterparticle);
>> 165
>> 166 //electronic neutrino 1
186 167
187 // electronic neutrino 1 << 168 daughtermomentum[1]=std::sqrt(Ene*Ene*EMax*EMax+2.0*Ene*EMax * daughtermass[1]);
188 << 169 G4ThreeVector direction1(sintheta,0.0,costheta);
189 daughtermomentum[1] = std::sqrt(Ene * Ene * <<
190 G4ThreeVector direction1(sintheta, 0.0, cost <<
191 170
192 direction1 *= rot; 171 direction1 *= rot;
193 172
194 auto daughterparticle1 = << 173 G4DynamicParticle * daughterparticle1 = new G4DynamicParticle ( daughters[1], direction1 * daughtermomentum[1]);
195 new G4DynamicParticle(G4MT_daughters[1], d <<
196 products->PushProducts(daughterparticle1); 174 products->PushProducts(daughterparticle1);
197 175
198 // muonnic neutrino 2 << 176 //muonnic neutrino 2
199 << 177
200 daughtermomentum[2] = std::sqrt(Enm * Enm * << 178 daughtermomentum[2]=std::sqrt(Enm*Enm*EMax*EMax +2.0*Enm*EMax*daughtermass[2]);
201 G4ThreeVector direction2(-Ene / Enm * sinthe << 179 G4ThreeVector direction2(-Ene/Enm*sintheta,0,-Ee/Enm-Ene/Enm*costheta);
202 180
203 direction2 *= rot; 181 direction2 *= rot;
204 182
205 auto daughterparticle2 = << 183 G4DynamicParticle * daughterparticle2 = new G4DynamicParticle ( daughters[2],
206 new G4DynamicParticle(G4MT_daughters[2], d << 184 direction2 * daughtermomentum[2]);
207 products->PushProducts(daughterparticle2); 185 products->PushProducts(daughterparticle2);
208 186
209 // output message << 187
>> 188
>> 189
>> 190 // output message
210 #ifdef G4VERBOSE 191 #ifdef G4VERBOSE
211 if (GetVerboseLevel() > 1) { << 192 if (GetVerboseLevel()>1) {
212 G4cout << "G4MuonDecayChannel::DecayIt()"; << 193 G4cout << "G4MuonDecayChannel::DecayIt ";
213 G4cout << " create decay products in rest << 194 G4cout << " create decay products in rest frame " <<G4endl;
214 products->DumpInfo(); 195 products->DumpInfo();
215 } 196 }
216 #endif 197 #endif
217 return products; 198 return products;
218 } 199 }
>> 200
>> 201
>> 202
>> 203
>> 204
>> 205
219 206