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