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25 // 25 //
26 // G4NeutronBetaDecayChannel class implementat <<
27 // 26 //
28 // Author: H.Kurashige, 18 September 2001 << 27 // $Id: G4NeutronBetaDecayChannel.cc 91896 2015-08-10 09:54:06Z gcosmo $
29 // ------------------------------------------- << 28 // GEANT4 tag $Name: geant4-09-04-ref-00 $
30 << 29 //
31 #include "G4NeutronBetaDecayChannel.hh" << 30 //
>> 31 // ------------------------------------------------------------
>> 32 // GEANT 4 class header file
>> 33 //
>> 34 // History: first implementation, based on object model of
>> 35 // 18 Sep 2001 H.Kurashige
>> 36 //---
>> 37 // Fix energy of proton and neutrino May 2011 H.Kurashige
>> 38 // Fix direction of proton and neutrino Nov 2013 H.Kurashige
>> 39 // ------------------------------------------------------------
32 40
33 #include "G4DecayProducts.hh" <<
34 #include "G4LorentzRotation.hh" <<
35 #include "G4LorentzVector.hh" <<
36 #include "G4ParticleDefinition.hh" 41 #include "G4ParticleDefinition.hh"
37 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
38 #include "G4RotationMatrix.hh" <<
39 #include "G4SystemOfUnits.hh" 43 #include "G4SystemOfUnits.hh"
>> 44 #include "G4DecayProducts.hh"
40 #include "G4VDecayChannel.hh" 45 #include "G4VDecayChannel.hh"
>> 46 #include "G4NeutronBetaDecayChannel.hh"
41 #include "Randomize.hh" 47 #include "Randomize.hh"
>> 48 #include "G4RotationMatrix.hh"
>> 49 #include "G4LorentzVector.hh"
>> 50 #include "G4LorentzRotation.hh"
>> 51
>> 52 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel()
>> 53 :G4VDecayChannel(),
>> 54 aENuCorr(-0.102)
>> 55 {
>> 56 }
42 57
43 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 58 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel(
44 : G4VDecayChannel("Neutron Decay") << 59 const G4String& theParentName,
>> 60 G4double theBR)
>> 61 :G4VDecayChannel("Neutron Decay"),
>> 62 aENuCorr(-0.102)
45 { 63 {
46 // set names for daughter particles 64 // set names for daughter particles
47 if (theParentName == "neutron") { 65 if (theParentName == "neutron") {
48 SetBR(theBR); 66 SetBR(theBR);
49 SetParent("neutron"); 67 SetParent("neutron");
50 SetNumberOfDaughters(3); 68 SetNumberOfDaughters(3);
51 SetDaughter(0, "e-"); 69 SetDaughter(0, "e-");
52 SetDaughter(1, "anti_nu_e"); 70 SetDaughter(1, "anti_nu_e");
53 SetDaughter(2, "proton"); 71 SetDaughter(2, "proton");
54 } << 72 } else if (theParentName == "anti_neutron") {
55 else if (theParentName == "anti_neutron") { <<
56 SetBR(theBR); 73 SetBR(theBR);
57 SetParent("anti_neutron"); 74 SetParent("anti_neutron");
58 SetNumberOfDaughters(3); 75 SetNumberOfDaughters(3);
59 SetDaughter(0, "e+"); 76 SetDaughter(0, "e+");
60 SetDaughter(1, "nu_e"); 77 SetDaughter(1, "nu_e");
61 SetDaughter(2, "anti_proton"); 78 SetDaughter(2, "anti_proton");
62 } << 79 } else {
63 else { <<
64 #ifdef G4VERBOSE 80 #ifdef G4VERBOSE
65 if (GetVerboseLevel() > 0) { << 81 if (GetVerboseLevel()>0) {
66 G4cout << "G4NeutronBetaDecayChannel:: c 82 G4cout << "G4NeutronBetaDecayChannel:: constructor :";
67 G4cout << " parent particle is not neutr 83 G4cout << " parent particle is not neutron but ";
68 G4cout << theParentName << G4endl; 84 G4cout << theParentName << G4endl;
69 } 85 }
70 #endif 86 #endif
71 } 87 }
72 } 88 }
73 89
74 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 90 G4NeutronBetaDecayChannel::~G4NeutronBetaDecayChannel()
75 : G4VDecayChannel(right) << 91 {
76 {} << 92 }
>> 93
>> 94 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel(const G4NeutronBetaDecayChannel &right)
>> 95 : G4VDecayChannel(right),
>> 96 aENuCorr(-0.102)
>> 97 {
>> 98 }
>> 99
77 100
78 G4NeutronBetaDecayChannel& << 101 G4NeutronBetaDecayChannel & G4NeutronBetaDecayChannel::operator=(const G4NeutronBetaDecayChannel & right)
79 G4NeutronBetaDecayChannel::operator=(const G4N <<
80 { 102 {
81 if (this != &right) { << 103 if (this != &right) {
82 kinematics_name = right.kinematics_name; 104 kinematics_name = right.kinematics_name;
83 verboseLevel = right.verboseLevel; 105 verboseLevel = right.verboseLevel;
84 rbranch = right.rbranch; 106 rbranch = right.rbranch;
85 107
86 // copy parent name 108 // copy parent name
87 delete parent_name; <<
88 parent_name = new G4String(*right.parent_n 109 parent_name = new G4String(*right.parent_name);
89 110
90 // clear daughters_name array 111 // clear daughters_name array
91 ClearDaughtersName(); 112 ClearDaughtersName();
92 113
93 // recreate array 114 // recreate array
94 numberOfDaughters = right.numberOfDaughter 115 numberOfDaughters = right.numberOfDaughters;
95 if (numberOfDaughters > 0) { << 116 if ( numberOfDaughters >0 ) {
>> 117 if (daughters_name !=0) ClearDaughtersName();
96 daughters_name = new G4String*[numberOfD 118 daughters_name = new G4String*[numberOfDaughters];
97 // copy daughters name << 119 //copy daughters name
98 for (G4int index = 0; index < numberOfDa << 120 for (G4int index=0; index < numberOfDaughters; index++) {
99 daughters_name[index] = new G4String(* << 121 daughters_name[index] = new G4String(*right.daughters_name[index]);
100 } 122 }
101 } 123 }
102 } 124 }
103 return *this; 125 return *this;
104 } 126 }
105 127
106 G4DecayProducts* G4NeutronBetaDecayChannel::De << 128 G4DecayProducts *G4NeutronBetaDecayChannel::DecayIt(G4double)
107 { 129 {
108 // This class describes free neutron beta d << 130 // This class describes free neutron beta decay kinemtics.
109 // This version neglects neutron/electron p << 131 // This version neglects neutron/electron polarization
110 // without Coulomb effect 132 // without Coulomb effect
111 133
112 #ifdef G4VERBOSE 134 #ifdef G4VERBOSE
113 if (GetVerboseLevel() > 1) G4cout << "G4Neut << 135 if (GetVerboseLevel()>1) G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
114 #endif 136 #endif
115 137
116 CheckAndFillParent(); << 138 if (G4MT_parent == 0) FillParent();
117 CheckAndFillDaughters(); << 139 if (G4MT_daughters == 0) FillDaughters();
118 << 140
119 // parent mass 141 // parent mass
120 G4double parentmass = G4MT_parent->GetPDGMas 142 G4double parentmass = G4MT_parent->GetPDGMass();
121 143
122 // daughters'mass << 144 //daughters'mass
123 G4double daughtermass[3]; << 145 G4double daughtermass[3];
124 G4double sumofdaughtermass = 0.0; 146 G4double sumofdaughtermass = 0.0;
125 for (G4int index = 0; index < 3; ++index) { << 147 for (G4int index=0; index<3; index++){
126 daughtermass[index] = G4MT_daughters[index 148 daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
127 sumofdaughtermass += daughtermass[index]; 149 sumofdaughtermass += daughtermass[index];
128 } 150 }
129 G4double xmax = parentmass - sumofdaughterma << 151 G4double xmax = parentmass-sumofdaughtermass;
130 152
131 // create parent G4DynamicParticle at rest << 153 //create parent G4DynamicParticle at rest
132 G4ThreeVector dummy; 154 G4ThreeVector dummy;
133 auto parentparticle = new G4DynamicParticle( << 155 G4DynamicParticle * parentparticle = new G4DynamicParticle( G4MT_parent, dummy, 0.0);
134 156
135 // create G4Decayproducts << 157 //create G4Decayproducts
136 auto products = new G4DecayProducts(*parentp << 158 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
137 delete parentparticle; 159 delete parentparticle;
138 160
139 // calculate daughter momentum 161 // calculate daughter momentum
140 G4double daughtermomentum[3]; 162 G4double daughtermomentum[3];
141 163
142 // calcurate electron energy 164 // calcurate electron energy
143 G4double x; // Ee << 165 G4double x; // Ee
144 G4double p; // Pe << 166 G4double p; // Pe
145 G4double dm = daughtermass[0]; // Me << 167 G4double dm = daughtermass[0]; //Me
146 G4double w; // cosine of e-nu angle << 168 G4double w; // cosine of e-nu angle
147 G4double r; << 169 G4double r;
148 G4double r0; 170 G4double r0;
149 const std::size_t MAX_LOOP = 10000; << 171 const size_t MAX_LOOP=10000;
150 for (std::size_t loop_counter = 0; loop_coun << 172 for (size_t loop_counter=0; loop_counter <MAX_LOOP; ++loop_counter){
151 x = xmax * G4UniformRand(); << 173 x = xmax*G4UniformRand();
152 p = std::sqrt(x * (x + 2.0 * dm)); << 174 p = std::sqrt(x*(x+2.0*dm));
153 w = 1.0 - 2.0 * G4UniformRand(); << 175 w = 1.0-2.0*G4UniformRand();
154 r = p * (x + dm) * (xmax - x) * (xmax - x) << 176 r = p*(x+dm)*(xmax-x)*(xmax-x)*(1.0+aENuCorr*p/(x+dm)*w);
155 r0 = G4UniformRand() * (xmax + dm) * (xmax << 177 r0 = G4UniformRand()*(xmax+dm)*(xmax+dm)*xmax*xmax*(1.0+aENuCorr);
156 if (r > r0) break; << 178 if (r > r0) break;
157 } << 179 }
158 180
159 // create daughter G4DynamicParticle << 181 //create daughter G4DynamicParticle
160 // rotation materix to lab frame 182 // rotation materix to lab frame
161 // << 183 G4double costheta = 2.*G4UniformRand()-1.0;
162 G4double costheta = 2. * G4UniformRand() - 1 << 184 G4double theta = std::acos(costheta)*rad;
163 G4double theta = std::acos(costheta) * rad; << 185 G4double phi = twopi*G4UniformRand()*rad;
164 G4double phi = twopi * G4UniformRand() * rad <<
165 G4RotationMatrix rm; 186 G4RotationMatrix rm;
166 rm.rotateY(theta); 187 rm.rotateY(theta);
167 rm.rotateZ(phi); 188 rm.rotateZ(phi);
168 189
169 // daughter 0 (electron) in Z direction 190 // daughter 0 (electron) in Z direction
170 daughtermomentum[0] = p; 191 daughtermomentum[0] = p;
171 G4ThreeVector direction0(0.0, 0.0, 1.0); 192 G4ThreeVector direction0(0.0, 0.0, 1.0);
172 direction0 = rm * direction0; 193 direction0 = rm * direction0;
173 auto daughterparticle0 = << 194 G4DynamicParticle * daughterparticle0
174 new G4DynamicParticle(G4MT_daughters[0], d << 195 = new G4DynamicParticle( G4MT_daughters[0], direction0*daughtermomentum[0]);
175 products->PushProducts(daughterparticle0); 196 products->PushProducts(daughterparticle0);
176 197
177 // daughter 1 (nutrino) in XZ plane 198 // daughter 1 (nutrino) in XZ plane
178 G4double eNu; // Enu << 199 G4double eNu; // Enu
179 eNu = (parentmass - daughtermass[2]) * (pare << 200 eNu = (parentmass-daughtermass[2])*(parentmass+daughtermass[2])+(dm*dm)-2.*parentmass*(x+dm);
180 - 2. * parentmass * (x + dm); << 201 eNu /= 2.*(parentmass+p*w-(x+dm));
181 eNu /= 2. * (parentmass + p * w - (x + dm)); <<
182 G4double cosn = w; 202 G4double cosn = w;
183 G4double phin = twopi * G4UniformRand() * ra << 203 G4double phin = twopi*G4UniformRand()*rad;
184 G4double sinn = std::sqrt((1.0 - cosn) * (1. << 204 G4double sinn = std::sqrt((1.0-cosn)*(1.0+cosn));
185 205
186 G4ThreeVector direction1(sinn * std::cos(phi << 206 G4ThreeVector direction1(sinn*std::cos(phin), sinn*std::sin(phin), cosn);
187 direction1 = rm * direction1; 207 direction1 = rm * direction1;
188 auto daughterparticle1 = new G4DynamicPartic << 208 G4DynamicParticle * daughterparticle1
>> 209 = new G4DynamicParticle( G4MT_daughters[1], direction1*eNu);
189 products->PushProducts(daughterparticle1); 210 products->PushProducts(daughterparticle1);
190 211
191 // daughter 2 (proton) at REST 212 // daughter 2 (proton) at REST
192 G4double eP; // Eproton << 213 G4double eP; // Eproton
193 eP = parentmass - eNu - (x + dm) - daughterm << 214 eP = parentmass-eNu-(x+dm)-daughtermass[2];
194 G4double pPx = -eNu * sinn; << 215 G4double pPx = -eNu*sinn;
195 G4double pPz = -p - eNu * cosn; << 216 G4double pPz = -p-eNu*cosn;
196 G4double pP = std::sqrt(eP * (eP + 2. * daug << 217 G4double pP = std::sqrt(eP*(eP+2.*daughtermass[2]));
197 G4ThreeVector direction2(pPx / pP * std::cos << 218 G4ThreeVector direction2(pPx/pP*std::cos(phin), pPx/pP*std::sin(phin), pPz/pP);
198 direction2 = rm * direction2; << 219 G4DynamicParticle * daughterparticle2
199 auto daughterparticle2 = new G4DynamicPartic << 220 = new G4DynamicParticle( G4MT_daughters[2], direction2);
200 products->PushProducts(daughterparticle2); 221 products->PushProducts(daughterparticle2);
>> 222
201 223
202 // output message << 224 // output message
203 #ifdef G4VERBOSE 225 #ifdef G4VERBOSE
204 if (GetVerboseLevel() > 1) { << 226 if (GetVerboseLevel()>1) {
205 G4cout << "G4NeutronBetaDecayChannel::Deca 227 G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
206 G4cout << " create decay products in rest << 228 G4cout << " create decay products in rest frame " <<G4endl;
207 products->DumpInfo(); 229 products->DumpInfo();
208 } 230 }
209 #endif 231 #endif
210 return products; 232 return products;
211 } 233 }
>> 234
>> 235
>> 236
>> 237
>> 238
>> 239
212 240