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25 // 25 //
26 // G4NeutronBetaDecayChannel class implementat <<
27 // 26 //
28 // Author: H.Kurashige, 18 September 2001 << 27 // $Id: G4NeutronBetaDecayChannel.cc,v 1.7 2006/06/29 19:25:38 gunter Exp $
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 // ------------------------------------------------------------
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 "G4DecayProducts.hh"
38 #include "G4RotationMatrix.hh" <<
39 #include "G4SystemOfUnits.hh" <<
40 #include "G4VDecayChannel.hh" 41 #include "G4VDecayChannel.hh"
>> 42 #include "G4NeutronBetaDecayChannel.hh"
41 #include "Randomize.hh" 43 #include "Randomize.hh"
>> 44 #include "G4RotationMatrix.hh"
>> 45 #include "G4LorentzVector.hh"
>> 46 #include "G4LorentzRotation.hh"
42 47
43 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 48
44 : G4VDecayChannel("Neutron Decay") << 49 G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel(
>> 50 const G4String& theParentName,
>> 51 G4double theBR)
>> 52 :G4VDecayChannel("Neutron Decay"),
>> 53 aENuCorr(-0.102)
45 { 54 {
46 // set names for daughter particles 55 // set names for daughter particles
47 if (theParentName == "neutron") { 56 if (theParentName == "neutron") {
48 SetBR(theBR); 57 SetBR(theBR);
49 SetParent("neutron"); 58 SetParent("neutron");
50 SetNumberOfDaughters(3); 59 SetNumberOfDaughters(3);
51 SetDaughter(0, "e-"); 60 SetDaughter(0, "e-");
52 SetDaughter(1, "anti_nu_e"); 61 SetDaughter(1, "anti_nu_e");
53 SetDaughter(2, "proton"); 62 SetDaughter(2, "proton");
54 } << 63 } else if (theParentName == "anti_neutron") {
55 else if (theParentName == "anti_neutron") { <<
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 } else {
63 else { <<
64 #ifdef G4VERBOSE 71 #ifdef G4VERBOSE
65 if (GetVerboseLevel() > 0) { << 72 if (GetVerboseLevel()>0) {
66 G4cout << "G4NeutronBetaDecayChannel:: c 73 G4cout << "G4NeutronBetaDecayChannel:: constructor :";
67 G4cout << " parent particle is not neutr 74 G4cout << " parent particle is not neutron but ";
68 G4cout << theParentName << G4endl; 75 G4cout << theParentName << G4endl;
69 } 76 }
70 #endif 77 #endif
71 } 78 }
72 } 79 }
73 80
74 G4NeutronBetaDecayChannel::G4NeutronBetaDecayC << 81 G4NeutronBetaDecayChannel::~G4NeutronBetaDecayChannel()
75 : G4VDecayChannel(right) <<
76 {} <<
77 <<
78 G4NeutronBetaDecayChannel& <<
79 G4NeutronBetaDecayChannel::operator=(const G4N <<
80 { 82 {
81 if (this != &right) { <<
82 kinematics_name = right.kinematics_name; <<
83 verboseLevel = right.verboseLevel; <<
84 rbranch = right.rbranch; <<
85 <<
86 // copy parent name <<
87 delete parent_name; <<
88 parent_name = new G4String(*right.parent_n <<
89 <<
90 // clear daughters_name array <<
91 ClearDaughtersName(); <<
92 <<
93 // recreate array <<
94 numberOfDaughters = right.numberOfDaughter <<
95 if (numberOfDaughters > 0) { <<
96 daughters_name = new G4String*[numberOfD <<
97 // copy daughters name <<
98 for (G4int index = 0; index < numberOfDa <<
99 daughters_name[index] = new G4String(* <<
100 } <<
101 } <<
102 } <<
103 return *this; <<
104 } 83 }
105 84
106 G4DecayProducts* G4NeutronBetaDecayChannel::De << 85 G4DecayProducts *G4NeutronBetaDecayChannel::DecayIt(G4double)
107 { 86 {
108 // This class describes free neutron beta d << 87 // This class describes free neutron beta decay kinemtics.
109 // This version neglects neutron/electron p << 88 // This version neglects neutron/electron polarization
110 // without Coulomb effect 89 // without Coulomb effect
111 90
112 #ifdef G4VERBOSE 91 #ifdef G4VERBOSE
113 if (GetVerboseLevel() > 1) G4cout << "G4Neut << 92 if (GetVerboseLevel()>1) G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
114 #endif 93 #endif
115 94
116 CheckAndFillParent(); << 95 if (parent == 0) FillParent();
117 CheckAndFillDaughters(); << 96 if (daughters == 0) FillDaughters();
118 << 97
119 // parent mass 98 // parent mass
120 G4double parentmass = G4MT_parent->GetPDGMas << 99 G4double parentmass = parent->GetPDGMass();
121 100
122 // daughters'mass << 101 //daughters'mass
123 G4double daughtermass[3]; << 102 G4double daughtermass[3];
124 G4double sumofdaughtermass = 0.0; 103 G4double sumofdaughtermass = 0.0;
125 for (G4int index = 0; index < 3; ++index) { << 104 for (G4int index=0; index<3; index++){
126 daughtermass[index] = G4MT_daughters[index << 105 daughtermass[index] = daughters[index]->GetPDGMass();
127 sumofdaughtermass += daughtermass[index]; 106 sumofdaughtermass += daughtermass[index];
128 } 107 }
129 G4double xmax = parentmass - sumofdaughterma << 108 G4double xmax = parentmass-sumofdaughtermass;
130 109
131 // create parent G4DynamicParticle at rest << 110 //create parent G4DynamicParticle at rest
132 G4ThreeVector dummy; 111 G4ThreeVector dummy;
133 auto parentparticle = new G4DynamicParticle( << 112 G4DynamicParticle * parentparticle = new G4DynamicParticle( parent, dummy, 0.0);
134 113
135 // create G4Decayproducts << 114 //create G4Decayproducts
136 auto products = new G4DecayProducts(*parentp << 115 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
137 delete parentparticle; 116 delete parentparticle;
138 117
139 // calculate daughter momentum 118 // calculate daughter momentum
140 G4double daughtermomentum[3]; 119 G4double daughtermomentum[3];
141 120
142 // calcurate electron energy 121 // calcurate electron energy
143 G4double x; // Ee << 122 G4double x; // Ee
144 G4double p; // Pe << 123 G4double p; // Pe
145 G4double dm = daughtermass[0]; // Me << 124 G4double m = daughtermass[0]; //Me
146 G4double w; // cosine of e-nu angle << 125 G4double w; // cosine of e-nu angle
147 G4double r; << 126 G4double r;
148 G4double r0; 127 G4double r0;
149 const std::size_t MAX_LOOP = 10000; << 128 do {
150 for (std::size_t loop_counter = 0; loop_coun << 129 x = xmax*G4UniformRand();
151 x = xmax * G4UniformRand(); << 130 p = std::sqrt(x*(x+2.0*m));
152 p = std::sqrt(x * (x + 2.0 * dm)); << 131 w = 1.0-2.0*G4UniformRand();
153 w = 1.0 - 2.0 * G4UniformRand(); << 132 r = p*(x+m)*(xmax-x)*(xmax-x)*(1.0+aENuCorr*p/(x+m)*w);
154 r = p * (x + dm) * (xmax - x) * (xmax - x) << 133 r0 = G4UniformRand()*(xmax+m)*(xmax+m)*xmax*xmax*(1.0+aENuCorr);
155 r0 = G4UniformRand() * (xmax + dm) * (xmax << 134 } while (r < r0);
156 if (r > r0) break; <<
157 } <<
158 135
159 // create daughter G4DynamicParticle << 136 //create daughter G4DynamicParticle
160 // rotation materix to lab frame 137 // rotation materix to lab frame
161 // << 138 G4double costheta = 2.*G4UniformRand()-1.0;
162 G4double costheta = 2. * G4UniformRand() - 1 << 139 G4double theta = std::acos(costheta)*rad;
163 G4double theta = std::acos(costheta) * rad; << 140 G4double phi = twopi*G4UniformRand()*rad;
164 G4double phi = twopi * G4UniformRand() * rad <<
165 G4RotationMatrix rm; 141 G4RotationMatrix rm;
166 rm.rotateY(theta); 142 rm.rotateY(theta);
167 rm.rotateZ(phi); 143 rm.rotateZ(phi);
168 144
169 // daughter 0 (electron) in Z direction 145 // daughter 0 (electron) in Z direction
170 daughtermomentum[0] = p; 146 daughtermomentum[0] = p;
171 G4ThreeVector direction0(0.0, 0.0, 1.0); 147 G4ThreeVector direction0(0.0, 0.0, 1.0);
172 direction0 = rm * direction0; 148 direction0 = rm * direction0;
173 auto daughterparticle0 = << 149 G4DynamicParticle * daughterparticle0
174 new G4DynamicParticle(G4MT_daughters[0], d << 150 = new G4DynamicParticle( daughters[0], direction0*daughtermomentum[0]);
175 products->PushProducts(daughterparticle0); 151 products->PushProducts(daughterparticle0);
176 152
177 // daughter 1 (nutrino) in XZ plane 153 // daughter 1 (nutrino) in XZ plane
178 G4double eNu; // Enu << 154 G4double eNu = xmax-x;
179 eNu = (parentmass - daughtermass[2]) * (pare <<
180 - 2. * parentmass * (x + dm); <<
181 eNu /= 2. * (parentmass + p * w - (x + dm)); <<
182 G4double cosn = w; 155 G4double cosn = w;
183 G4double phin = twopi * G4UniformRand() * ra << 156 G4double sinn = std::sqrt((1.0-cosn)*(1.0+cosn));
184 G4double sinn = std::sqrt((1.0 - cosn) * (1. <<
185 157
186 G4ThreeVector direction1(sinn * std::cos(phi << 158 G4ThreeVector direction1(sinn, 0.0, cosn);
187 direction1 = rm * direction1; 159 direction1 = rm * direction1;
188 auto daughterparticle1 = new G4DynamicPartic << 160 G4DynamicParticle * daughterparticle1
>> 161 = new G4DynamicParticle( daughters[1], direction1*eNu);
189 products->PushProducts(daughterparticle1); 162 products->PushProducts(daughterparticle1);
190 163
191 // daughter 2 (proton) at REST 164 // daughter 2 (proton) at REST
192 G4double eP; // Eproton << 165 G4ThreeVector direction2(0.0, 0.0, 0.0);
193 eP = parentmass - eNu - (x + dm) - daughterm << 166 G4DynamicParticle * daughterparticle2
194 G4double pPx = -eNu * sinn; << 167 = new G4DynamicParticle( daughters[2], direction2);
195 G4double pPz = -p - eNu * cosn; <<
196 G4double pP = std::sqrt(eP * (eP + 2. * daug <<
197 G4ThreeVector direction2(pPx / pP * std::cos <<
198 direction2 = rm * direction2; <<
199 auto daughterparticle2 = new G4DynamicPartic <<
200 products->PushProducts(daughterparticle2); 168 products->PushProducts(daughterparticle2);
>> 169
201 170
202 // output message << 171 // output message
203 #ifdef G4VERBOSE 172 #ifdef G4VERBOSE
204 if (GetVerboseLevel() > 1) { << 173 if (GetVerboseLevel()>1) {
205 G4cout << "G4NeutronBetaDecayChannel::Deca 174 G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
206 G4cout << " create decay products in rest << 175 G4cout << " create decay products in rest frame " <<G4endl;
207 products->DumpInfo(); 176 products->DumpInfo();
208 } 177 }
209 #endif 178 #endif
210 return products; 179 return products;
211 } 180 }
>> 181
>> 182
>> 183
>> 184
>> 185
>> 186
212 187