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25 // 25 //
26 // G4NeutronBetaDecayChannel class implementat <<
27 // 26 //
28 // Author: H.Kurashige, 18 September 2001 << 27 //
29 // ------------------------------------------- << 28 //
30 << 29 // ------------------------------------------------------------
31 #include "G4NeutronBetaDecayChannel.hh" << 30 // GEANT 4 class header file
>> 31 //
>> 32 // History: first implementation, based on object model of
>> 33 // 18 Sep 2001 H.Kurashige
>> 34 //---
>> 35 // Fix energy of proton and neutrino May 2011 H.Kurashige
>> 36 // Fix direction of proton and neutrino Nov 2013 H.Kurashige
>> 37 // ------------------------------------------------------------
32 38
33 #include "G4DecayProducts.hh" <<
34 #include "G4LorentzRotation.hh" <<
35 #include "G4LorentzVector.hh" <<
36 #include "G4ParticleDefinition.hh" 39 #include "G4ParticleDefinition.hh"
37 #include "G4PhysicalConstants.hh" 40 #include "G4PhysicalConstants.hh"
38 #include "G4RotationMatrix.hh" <<
39 #include "G4SystemOfUnits.hh" 41 #include "G4SystemOfUnits.hh"
>> 42 #include "G4DecayProducts.hh"
40 #include "G4VDecayChannel.hh" 43 #include "G4VDecayChannel.hh"
>> 44 #include "G4NeutronBetaDecayChannel.hh"
41 #include "Randomize.hh" 45 #include "Randomize.hh"
>> 46 #include "G4RotationMatrix.hh"
>> 47 #include "G4LorentzVector.hh"
>> 48 #include "G4LorentzRotation.hh"
>> 49
>> 50 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel()
>> 51 :G4VDecayChannel(),
>> 52 aENuCorr(-0.102)
>> 53 {
>> 54 }
42 55
43 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 56 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel(
44 : G4VDecayChannel("Neutron Decay") << 57 const G4String& theParentName,
>> 58 G4double theBR)
>> 59 :G4VDecayChannel("Neutron Decay"),
>> 60 aENuCorr(-0.102)
45 { 61 {
46 // set names for daughter particles 62 // set names for daughter particles
47 if (theParentName == "neutron") { 63 if (theParentName == "neutron") {
48 SetBR(theBR); 64 SetBR(theBR);
49 SetParent("neutron"); 65 SetParent("neutron");
50 SetNumberOfDaughters(3); 66 SetNumberOfDaughters(3);
51 SetDaughter(0, "e-"); 67 SetDaughter(0, "e-");
52 SetDaughter(1, "anti_nu_e"); 68 SetDaughter(1, "anti_nu_e");
53 SetDaughter(2, "proton"); 69 SetDaughter(2, "proton");
54 } << 70 } else if (theParentName == "anti_neutron") {
55 else if (theParentName == "anti_neutron") { <<
56 SetBR(theBR); 71 SetBR(theBR);
57 SetParent("anti_neutron"); 72 SetParent("anti_neutron");
58 SetNumberOfDaughters(3); 73 SetNumberOfDaughters(3);
59 SetDaughter(0, "e+"); 74 SetDaughter(0, "e+");
60 SetDaughter(1, "nu_e"); 75 SetDaughter(1, "nu_e");
61 SetDaughter(2, "anti_proton"); 76 SetDaughter(2, "anti_proton");
62 } << 77 } else {
63 else { <<
64 #ifdef G4VERBOSE 78 #ifdef G4VERBOSE
65 if (GetVerboseLevel() > 0) { << 79 if (GetVerboseLevel()>0) {
66 G4cout << "G4NeutronBetaDecayChannel:: c 80 G4cout << "G4NeutronBetaDecayChannel:: constructor :";
67 G4cout << " parent particle is not neutr 81 G4cout << " parent particle is not neutron but ";
68 G4cout << theParentName << G4endl; 82 G4cout << theParentName << G4endl;
69 } 83 }
70 #endif 84 #endif
71 } 85 }
72 } 86 }
73 87
74 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 88 G4NeutronBetaDecayChannel::~G4NeutronBetaDecayChannel()
75 : G4VDecayChannel(right) << 89 {
76 {} << 90 }
>> 91
>> 92 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel(const G4NeutronBetaDecayChannel &right)
>> 93 : G4VDecayChannel(right),
>> 94 aENuCorr(-0.102)
>> 95 {
>> 96 }
>> 97
77 98
78 G4NeutronBetaDecayChannel& << 99 G4NeutronBetaDecayChannel & G4NeutronBetaDecayChannel::operator=(const G4NeutronBetaDecayChannel & right)
79 G4NeutronBetaDecayChannel::operator=(const G4N <<
80 { 100 {
81 if (this != &right) { << 101 if (this != &right) {
82 kinematics_name = right.kinematics_name; 102 kinematics_name = right.kinematics_name;
83 verboseLevel = right.verboseLevel; 103 verboseLevel = right.verboseLevel;
84 rbranch = right.rbranch; 104 rbranch = right.rbranch;
85 105
86 // copy parent name 106 // copy parent name
87 delete parent_name; <<
88 parent_name = new G4String(*right.parent_n 107 parent_name = new G4String(*right.parent_name);
89 108
90 // clear daughters_name array 109 // clear daughters_name array
91 ClearDaughtersName(); 110 ClearDaughtersName();
92 111
93 // recreate array 112 // recreate array
94 numberOfDaughters = right.numberOfDaughter 113 numberOfDaughters = right.numberOfDaughters;
95 if (numberOfDaughters > 0) { << 114 if ( numberOfDaughters >0 ) {
>> 115 if (daughters_name !=0) ClearDaughtersName();
96 daughters_name = new G4String*[numberOfD 116 daughters_name = new G4String*[numberOfDaughters];
97 // copy daughters name << 117 //copy daughters name
98 for (G4int index = 0; index < numberOfDa << 118 for (G4int index=0; index < numberOfDaughters; index++) {
99 daughters_name[index] = new G4String(* << 119 daughters_name[index] = new G4String(*right.daughters_name[index]);
100 } 120 }
101 } 121 }
102 } 122 }
103 return *this; 123 return *this;
104 } 124 }
105 125
106 G4DecayProducts* G4NeutronBetaDecayChannel::De << 126 G4DecayProducts *G4NeutronBetaDecayChannel::DecayIt(G4double)
107 { 127 {
108 // This class describes free neutron beta d << 128 // This class describes free neutron beta decay kinemtics.
109 // This version neglects neutron/electron p << 129 // This version neglects neutron/electron polarization
110 // without Coulomb effect 130 // without Coulomb effect
111 131
112 #ifdef G4VERBOSE 132 #ifdef G4VERBOSE
113 if (GetVerboseLevel() > 1) G4cout << "G4Neut << 133 if (GetVerboseLevel()>1) G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
114 #endif 134 #endif
115 135
116 CheckAndFillParent(); 136 CheckAndFillParent();
117 CheckAndFillDaughters(); 137 CheckAndFillDaughters();
118 << 138
119 // parent mass 139 // parent mass
120 G4double parentmass = G4MT_parent->GetPDGMas 140 G4double parentmass = G4MT_parent->GetPDGMass();
121 141
122 // daughters'mass << 142 //daughters'mass
123 G4double daughtermass[3]; << 143 G4double daughtermass[3];
124 G4double sumofdaughtermass = 0.0; 144 G4double sumofdaughtermass = 0.0;
125 for (G4int index = 0; index < 3; ++index) { << 145 for (G4int index=0; index<3; index++){
126 daughtermass[index] = G4MT_daughters[index 146 daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
127 sumofdaughtermass += daughtermass[index]; 147 sumofdaughtermass += daughtermass[index];
128 } 148 }
129 G4double xmax = parentmass - sumofdaughterma << 149 G4double xmax = parentmass-sumofdaughtermass;
130 150
131 // create parent G4DynamicParticle at rest << 151 //create parent G4DynamicParticle at rest
132 G4ThreeVector dummy; 152 G4ThreeVector dummy;
133 auto parentparticle = new G4DynamicParticle( << 153 G4DynamicParticle * parentparticle = new G4DynamicParticle( G4MT_parent, dummy, 0.0);
134 154
135 // create G4Decayproducts << 155 //create G4Decayproducts
136 auto products = new G4DecayProducts(*parentp << 156 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
137 delete parentparticle; 157 delete parentparticle;
138 158
139 // calculate daughter momentum 159 // calculate daughter momentum
140 G4double daughtermomentum[3]; 160 G4double daughtermomentum[3];
141 161
142 // calcurate electron energy 162 // calcurate electron energy
143 G4double x; // Ee << 163 G4double x; // Ee
144 G4double p; // Pe << 164 G4double p; // Pe
145 G4double dm = daughtermass[0]; // Me << 165 G4double dm = daughtermass[0]; //Me
146 G4double w; // cosine of e-nu angle << 166 G4double w; // cosine of e-nu angle
147 G4double r; << 167 G4double r;
148 G4double r0; 168 G4double r0;
149 const std::size_t MAX_LOOP = 10000; << 169 const size_t MAX_LOOP=10000;
150 for (std::size_t loop_counter = 0; loop_coun << 170 for (size_t loop_counter=0; loop_counter <MAX_LOOP; ++loop_counter){
151 x = xmax * G4UniformRand(); << 171 x = xmax*G4UniformRand();
152 p = std::sqrt(x * (x + 2.0 * dm)); << 172 p = std::sqrt(x*(x+2.0*dm));
153 w = 1.0 - 2.0 * G4UniformRand(); << 173 w = 1.0-2.0*G4UniformRand();
154 r = p * (x + dm) * (xmax - x) * (xmax - x) << 174 r = p*(x+dm)*(xmax-x)*(xmax-x)*(1.0+aENuCorr*p/(x+dm)*w);
155 r0 = G4UniformRand() * (xmax + dm) * (xmax << 175 r0 = G4UniformRand()*(xmax+dm)*(xmax+dm)*xmax*xmax*(1.0+aENuCorr);
156 if (r > r0) break; << 176 if (r > r0) break;
157 } << 177 }
158 178
159 // create daughter G4DynamicParticle << 179 //create daughter G4DynamicParticle
160 // rotation materix to lab frame 180 // rotation materix to lab frame
161 // << 181 G4double costheta = 2.*G4UniformRand()-1.0;
162 G4double costheta = 2. * G4UniformRand() - 1 << 182 G4double theta = std::acos(costheta)*rad;
163 G4double theta = std::acos(costheta) * rad; << 183 G4double phi = twopi*G4UniformRand()*rad;
164 G4double phi = twopi * G4UniformRand() * rad <<
165 G4RotationMatrix rm; 184 G4RotationMatrix rm;
166 rm.rotateY(theta); 185 rm.rotateY(theta);
167 rm.rotateZ(phi); 186 rm.rotateZ(phi);
168 187
169 // daughter 0 (electron) in Z direction 188 // daughter 0 (electron) in Z direction
170 daughtermomentum[0] = p; 189 daughtermomentum[0] = p;
171 G4ThreeVector direction0(0.0, 0.0, 1.0); 190 G4ThreeVector direction0(0.0, 0.0, 1.0);
172 direction0 = rm * direction0; 191 direction0 = rm * direction0;
173 auto daughterparticle0 = << 192 G4DynamicParticle * daughterparticle0
174 new G4DynamicParticle(G4MT_daughters[0], d << 193 = new G4DynamicParticle( G4MT_daughters[0], direction0*daughtermomentum[0]);
175 products->PushProducts(daughterparticle0); 194 products->PushProducts(daughterparticle0);
176 195
177 // daughter 1 (nutrino) in XZ plane 196 // daughter 1 (nutrino) in XZ plane
178 G4double eNu; // Enu << 197 G4double eNu; // Enu
179 eNu = (parentmass - daughtermass[2]) * (pare << 198 eNu = (parentmass-daughtermass[2])*(parentmass+daughtermass[2])+(dm*dm)-2.*parentmass*(x+dm);
180 - 2. * parentmass * (x + dm); << 199 eNu /= 2.*(parentmass+p*w-(x+dm));
181 eNu /= 2. * (parentmass + p * w - (x + dm)); <<
182 G4double cosn = w; 200 G4double cosn = w;
183 G4double phin = twopi * G4UniformRand() * ra << 201 G4double phin = twopi*G4UniformRand()*rad;
184 G4double sinn = std::sqrt((1.0 - cosn) * (1. << 202 G4double sinn = std::sqrt((1.0-cosn)*(1.0+cosn));
185 203
186 G4ThreeVector direction1(sinn * std::cos(phi << 204 G4ThreeVector direction1(sinn*std::cos(phin), sinn*std::sin(phin), cosn);
187 direction1 = rm * direction1; 205 direction1 = rm * direction1;
188 auto daughterparticle1 = new G4DynamicPartic << 206 G4DynamicParticle * daughterparticle1
>> 207 = new G4DynamicParticle( G4MT_daughters[1], direction1*eNu);
189 products->PushProducts(daughterparticle1); 208 products->PushProducts(daughterparticle1);
190 209
191 // daughter 2 (proton) at REST 210 // daughter 2 (proton) at REST
192 G4double eP; // Eproton << 211 G4double eP; // Eproton
193 eP = parentmass - eNu - (x + dm) - daughterm << 212 eP = parentmass-eNu-(x+dm)-daughtermass[2];
194 G4double pPx = -eNu * sinn; << 213 G4double pPx = -eNu*sinn;
195 G4double pPz = -p - eNu * cosn; << 214 G4double pPz = -p-eNu*cosn;
196 G4double pP = std::sqrt(eP * (eP + 2. * daug << 215 G4double pP = std::sqrt(eP*(eP+2.*daughtermass[2]));
197 G4ThreeVector direction2(pPx / pP * std::cos << 216 G4ThreeVector direction2(pPx/pP*std::cos(phin), pPx/pP*std::sin(phin), pPz/pP);
198 direction2 = rm * direction2; 217 direction2 = rm * direction2;
199 auto daughterparticle2 = new G4DynamicPartic << 218 G4DynamicParticle * daughterparticle2
>> 219 = new G4DynamicParticle( G4MT_daughters[2], direction2*pP);
200 products->PushProducts(daughterparticle2); 220 products->PushProducts(daughterparticle2);
>> 221
201 222
202 // output message << 223 // output message
203 #ifdef G4VERBOSE 224 #ifdef G4VERBOSE
204 if (GetVerboseLevel() > 1) { << 225 if (GetVerboseLevel()>1) {
205 G4cout << "G4NeutronBetaDecayChannel::Deca 226 G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
206 G4cout << " create decay products in rest << 227 G4cout << " create decay products in rest frame " <<G4endl;
207 products->DumpInfo(); 228 products->DumpInfo();
208 } 229 }
209 #endif 230 #endif
210 return products; 231 return products;
211 } 232 }
>> 233
>> 234
>> 235
>> 236
>> 237
>> 238
212 239