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27 // 27 // //
28 // File: G4BetaMinusDecay.cc 28 // File: G4BetaMinusDecay.cc //
29 // Author: D.H. Wright (SLAC) 29 // Author: D.H. Wright (SLAC) //
30 // Date: 25 October 2014 30 // Date: 25 October 2014 //
31 // Modifications: <<
32 // 23.08.2023 V.Ivanchenko make it thread s <<
33 // 31 // //
34 ////////////////////////////////////////////// 32 ////////////////////////////////////////////////////////////////////////////////
35 33
36 #include "G4BetaMinusDecay.hh" 34 #include "G4BetaMinusDecay.hh"
37 #include "G4BetaDecayCorrections.hh" 35 #include "G4BetaDecayCorrections.hh"
38 #include "G4ThreeVector.hh" 36 #include "G4ThreeVector.hh"
39 #include "G4LorentzVector.hh" <<
40 #include "G4DynamicParticle.hh" 37 #include "G4DynamicParticle.hh"
41 #include "G4DecayProducts.hh" 38 #include "G4DecayProducts.hh"
42 #include "G4PhysicalConstants.hh" 39 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh" 40 #include "G4SystemOfUnits.hh"
44 #include "G4Electron.hh" <<
45 #include "G4AntiNeutrinoE.hh" <<
46 #include "G4RandomDirection.hh" <<
47 #include "G4BetaSpectrumSampler.hh" <<
48 #include <iostream> 41 #include <iostream>
49 #include <iomanip> 42 #include <iomanip>
50 43
51 namespace { <<
52 const G4double eMass = CLHEP::electron_mass_ <<
53 } <<
54 <<
55 G4BetaMinusDecay::G4BetaMinusDecay(const G4Par 44 G4BetaMinusDecay::G4BetaMinusDecay(const G4ParticleDefinition* theParentNucleus,
56 const G4dou 45 const G4double& branch, const G4double& e0,
57 const G4dou 46 const G4double& excitationE,
58 const G4Ion 47 const G4Ions::G4FloatLevelBase& flb,
59 const G4Bet 48 const G4BetaDecayType& betaType)
60 : G4NuclearDecay("beta- decay", BetaMinus, ex << 49 : G4NuclearDecay("beta- decay", BetaMinus, excitationE, flb), endpointEnergy(e0)
61 maxEnergy(e0/eMass), <<
62 estep(maxEnergy/(G4double)(npti - 1)) <<
63 { 50 {
64 SetParent(theParentNucleus); // Store name 51 SetParent(theParentNucleus); // Store name of parent nucleus, delete G4MT_parent
65 SetBR(branch); 52 SetBR(branch);
66 SetNumberOfDaughters(3); <<
67 53
68 fPrimaryIon = theParentNucleus; << 54 SetNumberOfDaughters(3);
69 fLepton = G4Electron::Electron(); << 55 G4IonTable* theIonTable =
70 fNeutrino = G4AntiNeutrinoE::AntiNeutrinoE() << 56 (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
71 <<
72 G4IonTable* theIonTable = G4ParticleTable::G <<
73 G4int daughterZ = theParentNucleus->GetAtomi 57 G4int daughterZ = theParentNucleus->GetAtomicNumber() + 1;
74 G4int daughterA = theParentNucleus->GetAtomi 58 G4int daughterA = theParentNucleus->GetAtomicMass();
75 fResIon = const_cast<const G4ParticleDefinit << 59 SetDaughter(0, theIonTable->GetIon(daughterZ, daughterA, excitationE, flb) );
76 << 60 SetDaughter(1, "e-");
77 parentMass = theParentNucleus->GetPDGMass(); << 61 SetDaughter(2, "anti_nu_e");
78 resMass = fResIon->GetPDGMass(); <<
79 62
80 SetUpBetaSpectrumSampler(daughterZ, daughter 63 SetUpBetaSpectrumSampler(daughterZ, daughterA, betaType);
>> 64 }
81 65
82 SetDaughter(0, fResIon); <<
83 SetDaughter(1, fLepton); <<
84 SetDaughter(2, fNeutrino); <<
85 66
>> 67 G4BetaMinusDecay::~G4BetaMinusDecay()
>> 68 {
>> 69 delete spectrumSampler;
>> 70 }
>> 71
>> 72
>> 73 G4DecayProducts* G4BetaMinusDecay::DecayIt(G4double)
>> 74 {
86 // Fill G4MT_parent with theParentNucleus (s 75 // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)
87 CheckAndFillParent(); 76 CheckAndFillParent();
88 77
89 // Fill G4MT_daughters with e-, nu and resid 78 // Fill G4MT_daughters with e-, nu and residual nucleus (stored by SetDaughter)
90 CheckAndFillDaughters(); 79 CheckAndFillDaughters();
91 } <<
92 80
93 G4DecayProducts* G4BetaMinusDecay::DecayIt(G4d << 81 G4double parentMass = G4MT_parent->GetPDGMass();
94 { << 82 G4double eMass = G4MT_daughters[1]->GetPDGMass();
>> 83 G4double nucleusMass = G4MT_daughters[0]->GetPDGMass();
95 // Set up final state 84 // Set up final state
96 // parentParticle is set at rest here becaus 85 // parentParticle is set at rest here because boost with correct momentum
97 // is done later 86 // is done later
98 G4DynamicParticle prim(fPrimaryIon, G4ThreeV << 87 G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
99 G4DecayProducts* products = new G4DecayProdu << 88 G4DecayProducts* products = new G4DecayProducts(parentParticle);
100 <<
101 // Generate electron isotropic in angle, wit <<
102 const G4double eKE = eMass*G4BetaSpectrumSam <<
103 <<
104 G4double eMomentum = std::sqrt(eKE*(eKE + 2. <<
105 G4ThreeVector dir = G4RandomDirection(); <<
106 G4DynamicParticle* dp = new G4DynamicParticl <<
107 products->PushProducts(dp); <<
108 /* <<
109 G4cout << "G4BetaPlusDecay::DecayIt: " << fP <<
110 << " -> " << fResIon->GetParticleName() << <<
111 << " + " << fNeutrino->GetParticleName() << <<
112 << G4endl; <<
113 */ <<
114 89
115 // 4-momentum of residual ion and neutrino << 90 if (spectrumSampler) {
116 G4LorentzVector lv(-eMomentum*dir.x(), -eMom << 91 // Electron, neutrino and daughter nucleus energies
117 parentMass - eKE - eMass) << 92 G4double eKE = endpointEnergy*spectrumSampler->shoot(G4Random::getTheEngine() );
118 << 93 G4double eMomentum = std::sqrt(eKE*(eKE + 2.*eMass) );
119 // centrum of mass system << 94
120 G4double M = lv.mag(); << 95 G4double cosThetaENu = 2.*G4UniformRand() - 1.;
121 const G4double elim = CLHEP::eV; << 96 G4double eTE = eMass + eKE;
122 G4double edel = M - resMass; << 97 G4double nuEnergy = ((endpointEnergy - eKE)*(parentMass + nucleusMass - eTE)
123 // Free energy should be above limit << 98 - eMomentum*eMomentum)/(parentMass - eTE + eMomentum*cosThetaENu)/2.;
124 if (edel >= elim) { << 99
125 // neutrino << 100 // Electron 4-vector, isotropic angular distribution
126 G4double eNu = 0.5*(M - resMass*resMass/M) << 101 G4double cosTheta = 2.*G4UniformRand() - 1.0;
127 G4LorentzVector lvnu(eNu*G4RandomDirection << 102 G4double sinTheta = std::sqrt(1.0 - cosTheta*cosTheta);
128 lvnu.boost(lv.boostVector()); << 103
129 dir = lvnu.vect().unit(); << 104 G4double phi = twopi*G4UniformRand()*rad;
130 dp = new G4DynamicParticle(fNeutrino, dir, << 105 G4double sinPhi = std::sin(phi);
131 products->PushProducts(dp); << 106 G4double cosPhi = std::cos(phi);
132 << 107
133 // residual << 108 G4ParticleMomentum eDirection(sinTheta*cosPhi, sinTheta*sinPhi, cosTheta);
134 lv -= lvnu; << 109 G4DynamicParticle* dynamicElectron
135 dir = lv.vect().unit(); << 110 = new G4DynamicParticle(G4MT_daughters[1], eDirection*eMomentum);
136 G4double ekin = std::max(lv.e() - resMass, << 111 products->PushProducts(dynamicElectron);
137 dp = new G4DynamicParticle(fResIon, dir, e << 112
138 products->PushProducts(dp); << 113 // Neutrino 4-vector
>> 114 G4double sinThetaENu = std::sqrt(1.0 - cosThetaENu*cosThetaENu);
>> 115 phi = twopi*G4UniformRand()*rad;
>> 116 G4double sinPhiNu = std::sin(phi);
>> 117 G4double cosPhiNu = std::cos(phi);
>> 118
>> 119 G4ParticleMomentum nuDirection;
>> 120 nuDirection.setX(sinThetaENu*cosPhiNu*cosTheta*cosPhi -
>> 121 sinThetaENu*sinPhiNu*sinPhi + cosThetaENu*sinTheta*cosPhi);
>> 122 nuDirection.setY(sinThetaENu*cosPhiNu*cosTheta*sinPhi +
>> 123 sinThetaENu*sinPhiNu*cosPhi + cosThetaENu*sinTheta*sinPhi);
>> 124 nuDirection.setZ(-sinThetaENu*cosPhiNu*sinTheta + cosThetaENu*cosTheta);
>> 125
>> 126 G4DynamicParticle* dynamicNeutrino
>> 127 = new G4DynamicParticle(G4MT_daughters[2], nuDirection*nuEnergy);
>> 128 products->PushProducts(dynamicNeutrino);
>> 129
>> 130 // Daughter nucleus 4-vector
>> 131 // p_D = - p_e - p_nu
>> 132 G4DynamicParticle* dynamicDaughter =
>> 133 new G4DynamicParticle(G4MT_daughters[0],
>> 134 -eDirection*eMomentum - nuDirection*nuEnergy);
>> 135 products->PushProducts(dynamicDaughter);
139 136
140 } else { 137 } else {
141 // neglecting relativistic kinematic and g << 138 // electron energy below threshold -> no decay
142 dp = new G4DynamicParticle(fNeutrino, G4Ra << 139 G4DynamicParticle* noDecay =
143 products->PushProducts(dp); << 140 new G4DynamicParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
144 dp = new G4DynamicParticle(fResIon, G4Thre << 141 products->PushProducts(noDecay);
145 products->PushProducts(dp); <<
146 } 142 }
147 143
>> 144 // Check energy conservation against Q value, not nuclear masses
>> 145 /*
>> 146 G4int nProd = products->entries();
>> 147 G4DynamicParticle* temp = 0;
>> 148 G4double Esum = 0.0;
>> 149 for (G4int i = 0; i < nProd; i++) {
>> 150 temp = products->operator[](i);
>> 151 // G4cout << temp->GetParticleDefinition()->GetParticleName() << " has "
>> 152 // << temp->GetTotalEnergy()/keV << " keV " << G4endl;
>> 153 Esum += temp->GetKineticEnergy();
>> 154 }
>> 155 G4double eCons = (endpointEnergy - Esum)/keV;
>> 156 if (std::abs(eCons) > 0.001) G4cout << " Beta- check: eCons = " << eCons << G4endl;
>> 157 */
148 return products; 158 return products;
149 } 159 }
150 160
151 161
152 void 162 void
153 G4BetaMinusDecay::SetUpBetaSpectrumSampler(con 163 G4BetaMinusDecay::SetUpBetaSpectrumSampler(const G4int& daughterZ,
154 con 164 const G4int& daughterA,
155 con 165 const G4BetaDecayType& betaType)
156 { 166 {
157 cdf[0] = 0.0; << 167 G4double e0 = endpointEnergy/CLHEP::electron_mass_c2;
158 << 168 G4BetaDecayCorrections corrections(daughterZ, daughterA);
159 // Check for cases in which Q < 0 << 169 spectrumSampler = 0;
160 if (maxEnergy > 0.) { << 170
161 G4BetaDecayCorrections corrections(daughte << 171 if (e0 > 0) {
162 << 172 // Array to store spectrum pdf
163 // Fill array to store cumulative spectrum << 173 G4int npti = 100;
164 G4double ex; // Kinetic energy normalized << 174 G4double* pdf = new G4double[npti];
165 G4double p; // Momentum in units of elec << 175
166 G4double f; // Spectral shape function << 176 G4double e; // Total electron energy in units of electron mass
167 G4double f0 = 0.0; << 177 G4double p; // Electron momentum in units of electron mass
168 G4double sum = 0.0; << 178 G4double f; // Spectral shape function
169 for (G4int i = 1; i < npti-1; ++i) { << 179 for (G4int ptn = 0; ptn < npti; ptn++) {
170 ex = estep*i; << 180 // Calculate simple phase space
171 p = std::sqrt(ex*(ex + 2.)); << 181 e = 1. + e0*(G4double(ptn) + 0.5)/G4double(npti);
172 f = p*(1. + ex)*(maxEnergy - ex)*(maxEne << 182 p = std::sqrt(e*e - 1.);
>> 183 f = p*e*(e0 - e + 1.)*(e0 - e + 1.);
173 184
174 // Apply Fermi factor to get allowed sha 185 // Apply Fermi factor to get allowed shape
175 f *= corrections.FermiFunction(1. + ex); << 186 f *= corrections.FermiFunction(e);
176 187
177 // Apply shape factor for forbidden tran 188 // Apply shape factor for forbidden transitions
178 f *= corrections.ShapeFactor(betaType, p << 189 f *= corrections.ShapeFactor(betaType, p, e0-e+1.);
179 sum += f + f0; << 190 pdf[ptn] = f;
180 cdf[i] = sum; <<
181 f0 = f; <<
182 } 191 }
183 cdf[npti-1] = sum + f0; << 192 spectrumSampler = new G4RandGeneral(pdf, npti);
184 } else { << 193 delete[] pdf;
185 for (G4int i = 1; i < npti; ++i) { cdf[i] <<
186 } 194 }
187 } 195 }
188 196
189 197
190 void G4BetaMinusDecay::DumpNuclearInfo() 198 void G4BetaMinusDecay::DumpNuclearInfo()
191 { 199 {
192 G4cout << " G4BetaMinusDecay " << fPrimaryI << 200 G4cout << " G4BetaMinusDecay for parent nucleus " << GetParentName() << G4endl;
193 << " -> " << fResIon->GetParticleName() << << 201 G4cout << " decays to " << GetDaughterName(0) << " , " << GetDaughterName(1)
194 << " + " << fNeutrino->GetParticleName() << << 202 << " and " << GetDaughterName(2) << " with branching ratio " << GetBR()
195 << maxEnergy*eMass << " BR=" << GetBR() << << 203 << "% and endpoint energy " << endpointEnergy/keV << " keV " << G4endl;
196 } 204 }
197 205
198 206