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26 ////////////////////////////////////////////////////////////////////////////////
27 // //
28 // File: G4SFDecay.cc //
29 // Author: D.H. Wright (SLAC) //
30 // Date: 27 March 2019 //
31 // //
32 ////////////////////////////////////////////////////////////////////////////////
33
34 #include "G4SFDecay.hh"
35 #include "G4fissionEvent.hh"
36 #include "G4IonTable.hh"
37 #include "G4ThreeVector.hh"
38 #include "G4LorentzVector.hh"
39 #include "G4DynamicParticle.hh"
40 #include "G4DecayProducts.hh"
41 #include "G4Neutron.hh"
42 #include "G4Gamma.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "G4PhysicalConstants.hh"
45
46
47 G4SFDecay::G4SFDecay(const G4ParticleDefinition* theParentNucleus,
48 const G4double& branch, const G4double& Qvalue,
49 const G4double& excitationE,
50 const G4Ions::G4FloatLevelBase& flb)
51 : G4NuclearDecay("SF decay", SpFission, excitationE, flb), transitionQ(Qvalue)
52 {
53 SetParent(theParentNucleus); // Store name of parent nucleus, delete G4MT_parent
54 SetBR(branch);
55
56 parentZ = theParentNucleus->GetAtomicNumber();
57 parentA = theParentNucleus->GetAtomicMass();
58
59 // SetNumberOfDaughters(0); doesn't seem to work
60 // Set to 1 for now
61 // When we later install proper fragment generation, set this to 2
62 // and modify Z and A in DecayIt()
63 SetNumberOfDaughters(1);
64 G4IonTable* theIonTable =
65 (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
66 SetDaughter(0, theIonTable->GetIon(parentZ, parentA, excitationE, flb) );
67 }
68
69
70 G4SFDecay::~G4SFDecay()
71 {}
72
73
74 G4DecayProducts* G4SFDecay::DecayIt(G4double)
75 {
76 // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)
77 CheckAndFillParent();
78
79 // Set up final state
80 // parentParticle is set at rest here because boost with correct momentum
81 // is done later
82 G4LorentzVector atRest(G4MT_parent->GetPDGMass(),
83 G4ThreeVector(0.,0.,0.) );
84 G4DynamicParticle parentParticle(G4MT_parent, atRest);
85 G4DecayProducts* products = new G4DecayProducts(parentParticle);
86
87 // Generate LLNL code for parent nucleus
88 G4int code = 1000*G4MT_parent->GetAtomicNumber() +
89 G4MT_parent->GetAtomicMass();
90
91 // Let G4fissionEvent do the decay
92 // Argument 2 : time, passed through to set time of secondary
93 // Argument 3 : nubar, when set to -1, selects spontaneous fission
94 // Argument 4 : energy used in Watt spectrum
95 G4fissionEvent aFission(code, 10.0, -1, 0.);
96 G4int nNeut = aFission.getNeutronNu();
97 G4int nGam = aFission.getPhotonNu();
98
99 G4DynamicParticle* dynPart = 0;
100 G4ThreeVector direction(0.,0.,0.);
101 G4double KE = 0.; // energy from generator is in MeV
102
103 if (nNeut > 0) {
104 // Put neutrons on the stack
105 for (G4int i = 0; i < nNeut; i++) {
106 KE = aFission.getNeutronEnergy(i);
107 direction.setX(aFission.getNeutronDircosu(i) );
108 direction.setY(aFission.getNeutronDircosv(i) );
109 direction.setZ(aFission.getNeutronDircosw(i) );
110
111 dynPart = new G4DynamicParticle(G4Neutron::Neutron(), direction, KE);
112
113 // Not needed - time comes from parent track
114 // dynPart->SetProperTime(aFission.getNeutronAge(i) );
115
116 products->PushProducts(dynPart);
117 }
118
119 // Put gammas on the stack
120 for (G4int i = 0; i < nGam; i++) {
121 KE = aFission.getPhotonEnergy(i);
122 direction.setX(aFission.getPhotonDircosu(i) );
123 direction.setY(aFission.getPhotonDircosv(i) );
124 direction.setZ(aFission.getPhotonDircosw(i) );
125
126 dynPart = new G4DynamicParticle(G4Gamma::Gamma(), direction, KE);
127
128 // Not needed - time comes from parent track
129 // dynPart->SetProperTime(aFission.getPhotonAge(i) );
130
131 products->PushProducts(dynPart);
132 // No residual nucleus in this model
133 }
134
135 } else {
136 // No data for this isotope, return parent nucleus for now
137 // G4cout << " No fission data for this isotope " << G4endl;
138 G4DynamicParticle* parent =
139 new G4DynamicParticle(G4MT_parent, G4ThreeVector(0.,0.,0.) );
140 products->PushProducts(parent);
141 }
142
143 // Energy conservation check not valid in this model
144
145 return products;
146 }
147
148
149 void G4SFDecay::DumpNuclearInfo()
150 {
151 G4cout << " G4SFDecay for parent nucleus " << GetParentName() << G4endl;
152 G4cout << " decays to neutrons and gammas, with branching ratio " << GetBR()
153 << "% and Q value " << transitionQ << G4endl;
154 }
155
156