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25 // 25 //
26 // G4NeutronBetaDecayChannel class implementat 26 // G4NeutronBetaDecayChannel class implementation
27 // 27 //
28 // Author: H.Kurashige, 18 September 2001 << 28 // Author: H.Kurashige, 18 September 2001
29 // ------------------------------------------- 29 // --------------------------------------------------------------------
30 30
31 #include "G4NeutronBetaDecayChannel.hh" <<
32 <<
33 #include "G4DecayProducts.hh" <<
34 #include "G4LorentzRotation.hh" <<
35 #include "G4LorentzVector.hh" <<
36 #include "G4ParticleDefinition.hh" 31 #include "G4ParticleDefinition.hh"
37 #include "G4PhysicalConstants.hh" 32 #include "G4PhysicalConstants.hh"
38 #include "G4RotationMatrix.hh" <<
39 #include "G4SystemOfUnits.hh" 33 #include "G4SystemOfUnits.hh"
>> 34 #include "G4DecayProducts.hh"
40 #include "G4VDecayChannel.hh" 35 #include "G4VDecayChannel.hh"
>> 36 #include "G4NeutronBetaDecayChannel.hh"
41 #include "Randomize.hh" 37 #include "Randomize.hh"
>> 38 #include "G4RotationMatrix.hh"
>> 39 #include "G4LorentzVector.hh"
>> 40 #include "G4LorentzRotation.hh"
42 41
43 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 42 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel()
>> 43 : G4VDecayChannel()
>> 44 {
>> 45 }
>> 46
>> 47 G4NeutronBetaDecayChannel::
>> 48 G4NeutronBetaDecayChannel(const G4String& theParentName,
>> 49 G4double theBR)
44 : G4VDecayChannel("Neutron Decay") 50 : G4VDecayChannel("Neutron Decay")
45 { 51 {
46 // set names for daughter particles 52 // set names for daughter particles
47 if (theParentName == "neutron") { << 53 if (theParentName == "neutron")
>> 54 {
48 SetBR(theBR); 55 SetBR(theBR);
49 SetParent("neutron"); 56 SetParent("neutron");
50 SetNumberOfDaughters(3); 57 SetNumberOfDaughters(3);
51 SetDaughter(0, "e-"); 58 SetDaughter(0, "e-");
52 SetDaughter(1, "anti_nu_e"); 59 SetDaughter(1, "anti_nu_e");
53 SetDaughter(2, "proton"); 60 SetDaughter(2, "proton");
54 } 61 }
55 else if (theParentName == "anti_neutron") { << 62 else if (theParentName == "anti_neutron")
>> 63 {
56 SetBR(theBR); 64 SetBR(theBR);
57 SetParent("anti_neutron"); 65 SetParent("anti_neutron");
58 SetNumberOfDaughters(3); 66 SetNumberOfDaughters(3);
59 SetDaughter(0, "e+"); 67 SetDaughter(0, "e+");
60 SetDaughter(1, "nu_e"); 68 SetDaughter(1, "nu_e");
61 SetDaughter(2, "anti_proton"); 69 SetDaughter(2, "anti_proton");
62 } 70 }
63 else { << 71 else
>> 72 {
64 #ifdef G4VERBOSE 73 #ifdef G4VERBOSE
65 if (GetVerboseLevel() > 0) { << 74 if (GetVerboseLevel()>0)
>> 75 {
66 G4cout << "G4NeutronBetaDecayChannel:: c 76 G4cout << "G4NeutronBetaDecayChannel:: constructor :";
67 G4cout << " parent particle is not neutr 77 G4cout << " parent particle is not neutron but ";
68 G4cout << theParentName << G4endl; 78 G4cout << theParentName << G4endl;
69 } 79 }
70 #endif 80 #endif
71 } 81 }
72 } 82 }
73 83
74 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 84 G4NeutronBetaDecayChannel::~G4NeutronBetaDecayChannel()
>> 85 {
>> 86 }
>> 87
>> 88 G4NeutronBetaDecayChannel::
>> 89 G4NeutronBetaDecayChannel(const G4NeutronBetaDecayChannel& right)
75 : G4VDecayChannel(right) 90 : G4VDecayChannel(right)
76 {} << 91 {
>> 92 }
77 93
78 G4NeutronBetaDecayChannel& << 94 G4NeutronBetaDecayChannel& G4NeutronBetaDecayChannel::
79 G4NeutronBetaDecayChannel::operator=(const G4N << 95 operator=(const G4NeutronBetaDecayChannel& right)
80 { 96 {
81 if (this != &right) { << 97 if (this != &right)
>> 98 {
82 kinematics_name = right.kinematics_name; 99 kinematics_name = right.kinematics_name;
83 verboseLevel = right.verboseLevel; 100 verboseLevel = right.verboseLevel;
84 rbranch = right.rbranch; 101 rbranch = right.rbranch;
85 102
86 // copy parent name 103 // copy parent name
87 delete parent_name; 104 delete parent_name;
88 parent_name = new G4String(*right.parent_n 105 parent_name = new G4String(*right.parent_name);
89 106
90 // clear daughters_name array 107 // clear daughters_name array
91 ClearDaughtersName(); 108 ClearDaughtersName();
92 109
93 // recreate array 110 // recreate array
94 numberOfDaughters = right.numberOfDaughter 111 numberOfDaughters = right.numberOfDaughters;
95 if (numberOfDaughters > 0) { << 112 if ( numberOfDaughters >0 )
>> 113 {
96 daughters_name = new G4String*[numberOfD 114 daughters_name = new G4String*[numberOfDaughters];
97 // copy daughters name 115 // copy daughters name
98 for (G4int index = 0; index < numberOfDa << 116 for (G4int index=0; index<numberOfDaughters; ++index)
>> 117 {
99 daughters_name[index] = new G4String(* 118 daughters_name[index] = new G4String(*right.daughters_name[index]);
100 } 119 }
101 } 120 }
102 } 121 }
103 return *this; 122 return *this;
104 } 123 }
105 124
106 G4DecayProducts* G4NeutronBetaDecayChannel::De << 125 G4DecayProducts* G4NeutronBetaDecayChannel::DecayIt(G4double)
107 { 126 {
108 // This class describes free neutron beta d 127 // This class describes free neutron beta decay kinematics.
109 // This version neglects neutron/electron p << 128 // This version neglects neutron/electron polarization
110 // without Coulomb effect 129 // without Coulomb effect
111 130
112 #ifdef G4VERBOSE 131 #ifdef G4VERBOSE
113 if (GetVerboseLevel() > 1) G4cout << "G4Neut << 132 if (GetVerboseLevel()>1) G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
114 #endif 133 #endif
115 134
116 CheckAndFillParent(); 135 CheckAndFillParent();
117 CheckAndFillDaughters(); 136 CheckAndFillDaughters();
118 << 137
119 // parent mass 138 // parent mass
120 G4double parentmass = G4MT_parent->GetPDGMas 139 G4double parentmass = G4MT_parent->GetPDGMass();
121 140
122 // daughters'mass 141 // daughters'mass
123 G4double daughtermass[3]; << 142 G4double daughtermass[3];
124 G4double sumofdaughtermass = 0.0; 143 G4double sumofdaughtermass = 0.0;
125 for (G4int index = 0; index < 3; ++index) { << 144 for (G4int index=0; index<3; ++index)
>> 145 {
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
>> 154 = new G4DynamicParticle( G4MT_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 const std::size_t MAX_LOOP=10000;
150 for (std::size_t loop_counter = 0; loop_coun << 171 for (std::size_t loop_counter=0; loop_counter<MAX_LOOP; ++loop_counter)
151 x = xmax * G4UniformRand(); << 172 {
152 p = std::sqrt(x * (x + 2.0 * dm)); << 173 x = xmax*G4UniformRand();
153 w = 1.0 - 2.0 * G4UniformRand(); << 174 p = std::sqrt(x*(x+2.0*dm));
154 r = p * (x + dm) * (xmax - x) * (xmax - x) << 175 w = 1.0-2.0*G4UniformRand();
155 r0 = G4UniformRand() * (xmax + dm) * (xmax << 176 r = p*(x+dm)*(xmax-x)*(xmax-x)*(1.0+aENuCorr*p/(x+dm)*w);
156 if (r > r0) break; << 177 r0 = G4UniformRand()*(xmax+dm)*(xmax+dm)*xmax*xmax*(1.0+aENuCorr);
157 } << 178 if (r > r0) break;
>> 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 //
162 G4double costheta = 2. * G4UniformRand() - 1 << 184 G4double costheta = 2.*G4UniformRand()-1.0;
163 G4double theta = std::acos(costheta) * rad; << 185 G4double theta = std::acos(costheta)*rad;
164 G4double phi = twopi * G4UniformRand() * rad << 186 G4double phi = twopi*G4UniformRand()*rad;
165 G4RotationMatrix rm; 187 G4RotationMatrix rm;
166 rm.rotateY(theta); 188 rm.rotateY(theta);
167 rm.rotateZ(phi); 189 rm.rotateZ(phi);
168 190
169 // daughter 0 (electron) in Z direction 191 // daughter 0 (electron) in Z direction
170 daughtermomentum[0] = p; 192 daughtermomentum[0] = p;
171 G4ThreeVector direction0(0.0, 0.0, 1.0); 193 G4ThreeVector direction0(0.0, 0.0, 1.0);
172 direction0 = rm * direction0; 194 direction0 = rm * direction0;
173 auto daughterparticle0 = << 195 G4DynamicParticle* daughterparticle0
174 new G4DynamicParticle(G4MT_daughters[0], d << 196 = new G4DynamicParticle(G4MT_daughters[0], direction0*daughtermomentum[0]);
175 products->PushProducts(daughterparticle0); 197 products->PushProducts(daughterparticle0);
176 198
177 // daughter 1 (nutrino) in XZ plane 199 // daughter 1 (nutrino) in XZ plane
178 G4double eNu; // Enu << 200 G4double eNu; // Enu
179 eNu = (parentmass - daughtermass[2]) * (pare << 201 eNu = (parentmass-daughtermass[2])
180 - 2. * parentmass * (x + dm); << 202 * (parentmass+daughtermass[2])+(dm*dm)-2.*parentmass*(x+dm);
181 eNu /= 2. * (parentmass + p * w - (x + dm)); << 203 eNu /= 2.*(parentmass+p*w-(x+dm));
182 G4double cosn = w; 204 G4double cosn = w;
183 G4double phin = twopi * G4UniformRand() * ra << 205 G4double phin = twopi*G4UniformRand()*rad;
184 G4double sinn = std::sqrt((1.0 - cosn) * (1. << 206 G4double sinn = std::sqrt((1.0-cosn)*(1.0+cosn));
185 207
186 G4ThreeVector direction1(sinn * std::cos(phi << 208 G4ThreeVector direction1(sinn*std::cos(phin), sinn*std::sin(phin), cosn);
187 direction1 = rm * direction1; 209 direction1 = rm * direction1;
188 auto daughterparticle1 = new G4DynamicPartic << 210 G4DynamicParticle* daughterparticle1
>> 211 = new G4DynamicParticle( G4MT_daughters[1], direction1*eNu);
189 products->PushProducts(daughterparticle1); 212 products->PushProducts(daughterparticle1);
190 213
191 // daughter 2 (proton) at REST 214 // daughter 2 (proton) at REST
192 G4double eP; // Eproton << 215 G4double eP; // Eproton
193 eP = parentmass - eNu - (x + dm) - daughterm << 216 eP = parentmass-eNu-(x+dm)-daughtermass[2];
194 G4double pPx = -eNu * sinn; << 217 G4double pPx = -eNu*sinn;
195 G4double pPz = -p - eNu * cosn; << 218 G4double pPz = -p-eNu*cosn;
196 G4double pP = std::sqrt(eP * (eP + 2. * daug << 219 G4double pP = std::sqrt(eP*(eP+2.*daughtermass[2]));
197 G4ThreeVector direction2(pPx / pP * std::cos << 220 G4ThreeVector direction2(pPx/pP*std::cos(phin),
>> 221 pPx/pP*std::sin(phin), pPz/pP);
198 direction2 = rm * direction2; 222 direction2 = rm * direction2;
199 auto daughterparticle2 = new G4DynamicPartic << 223 G4DynamicParticle* daughterparticle2
>> 224 = new G4DynamicParticle( G4MT_daughters[2], direction2*pP);
200 products->PushProducts(daughterparticle2); 225 products->PushProducts(daughterparticle2);
201 226
202 // output message 227 // output message
203 #ifdef G4VERBOSE 228 #ifdef G4VERBOSE
204 if (GetVerboseLevel() > 1) { << 229 if (GetVerboseLevel()>1)
>> 230 {
205 G4cout << "G4NeutronBetaDecayChannel::Deca 231 G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
206 G4cout << " create decay products in rest << 232 G4cout << " create decay products in rest frame " <<G4endl;
207 products->DumpInfo(); 233 products->DumpInfo();
208 } 234 }
209 #endif 235 #endif
210 return products; 236 return products;
211 } 237 }
212 238