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26 ////////////////////////////////////////////// 26 ////////////////////////////////////////////////////////////////////////////////
27 // 27 // //
28 // File: G4ProtonDecay.cc 28 // File: G4ProtonDecay.cc //
29 // Author: L.G. Sarmiento (Lund) 29 // Author: L.G. Sarmiento (Lund) //
30 // Date: 10 March 2015 30 // Date: 10 March 2015 //
31 // 31 // //
32 ////////////////////////////////////////////// 32 ////////////////////////////////////////////////////////////////////////////////
33 33
34 #include "G4ProtonDecay.hh" 34 #include "G4ProtonDecay.hh"
35 #include "G4IonTable.hh" 35 #include "G4IonTable.hh"
36 #include "Randomize.hh" 36 #include "Randomize.hh"
37 #include "G4ThreeVector.hh" 37 #include "G4ThreeVector.hh"
38 #include "G4DynamicParticle.hh" 38 #include "G4DynamicParticle.hh"
39 #include "G4DecayProducts.hh" 39 #include "G4DecayProducts.hh"
40 #include "G4PhysicalConstants.hh" 40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh" 41 #include "G4SystemOfUnits.hh"
42 #include <iostream> 42 #include <iostream>
43 #include <iomanip> 43 #include <iomanip>
44 44
45 G4ProtonDecay::G4ProtonDecay(const G4ParticleD 45 G4ProtonDecay::G4ProtonDecay(const G4ParticleDefinition* theParentNucleus,
46 const G4double& b << 46 const G4double& branch, const G4double& Qvalue,
47 const G4double& e << 47 const G4double& excitationE)
48 const G4Ions::G4F << 48 : G4NuclearDecay("proton decay", Proton, excitationE), transitionQ(Qvalue)
49 : G4NuclearDecay("proton decay", Proton, exci <<
50 { 49 {
51 SetParent(theParentNucleus); // Store name 50 SetParent(theParentNucleus); // Store name of parent nucleus, delete G4MT_parent
52 SetBR(branch); 51 SetBR(branch);
53 52
54 SetNumberOfDaughters(2); 53 SetNumberOfDaughters(2);
55 G4IonTable* theIonTable = 54 G4IonTable* theIonTable =
56 (G4IonTable*)(G4ParticleTable::GetParticle 55 (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
57 G4int daughterZ = theParentNucleus->GetAtomi 56 G4int daughterZ = theParentNucleus->GetAtomicNumber() - 1;
58 G4int daughterA = theParentNucleus->GetAtomi 57 G4int daughterA = theParentNucleus->GetAtomicMass() - 1;
59 SetDaughter(0, theIonTable->GetIon(daughterZ << 58 SetDaughter(0, theIonTable->GetIon(daughterZ, daughterA, excitationE) );
60 SetDaughter(1, "proton"); 59 SetDaughter(1, "proton");
61 } 60 }
62 61
63 62
64 G4ProtonDecay::~G4ProtonDecay() 63 G4ProtonDecay::~G4ProtonDecay()
65 {} 64 {}
66 65
67 66
68 G4DecayProducts* G4ProtonDecay::DecayIt(G4doub 67 G4DecayProducts* G4ProtonDecay::DecayIt(G4double)
69 { 68 {
70 // Fill G4MT_parent with theParentNucleus (s 69 // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)
71 CheckAndFillParent(); << 70 if (G4MT_parent == 0) FillParent();
72 71
73 // Fill G4MT_daughters with proton and resid 72 // Fill G4MT_daughters with proton and residual nucleus (stored by SetDaughter)
74 CheckAndFillDaughters(); << 73 if (G4MT_daughters == 0) FillDaughters();
75 74
76 G4double protonMass = G4MT_daughters[1]->Get 75 G4double protonMass = G4MT_daughters[1]->GetPDGMass();
77 // Excitation energy included in PDG mass 76 // Excitation energy included in PDG mass
78 G4double nucleusMass = G4MT_daughters[0]->Ge 77 G4double nucleusMass = G4MT_daughters[0]->GetPDGMass();
79 78
80 // Q value was calculated from atomic masses 79 // Q value was calculated from atomic masses.
81 // Use it to get correct proton energy. 80 // Use it to get correct proton energy.
82 G4double cmMomentum = std::sqrt(transitionQ* 81 G4double cmMomentum = std::sqrt(transitionQ*(transitionQ + 2.*protonMass)*
83 (transitionQ + 82 (transitionQ + 2.*nucleusMass)*
84 (transitionQ + 83 (transitionQ + 2.*protonMass + 2.*nucleusMass) )/
85 (transitionQ + 84 (transitionQ + protonMass + nucleusMass)/2.;
86 85
87 // Set up final state 86 // Set up final state
88 // parentParticle is set at rest here becaus 87 // parentParticle is set at rest here because boost with correct momentum
89 // is done later 88 // is done later
90 G4DynamicParticle parentParticle(G4MT_parent 89 G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
91 G4DecayProducts* products = new G4DecayProdu 90 G4DecayProducts* products = new G4DecayProducts(parentParticle);
92 91
93 G4double costheta = 2.*G4UniformRand()-1.0; 92 G4double costheta = 2.*G4UniformRand()-1.0;
94 G4double sintheta = std::sqrt(1.0 - costheta 93 G4double sintheta = std::sqrt(1.0 - costheta*costheta);
95 G4double phi = twopi*G4UniformRand()*rad; 94 G4double phi = twopi*G4UniformRand()*rad;
96 G4ThreeVector direction(sintheta*std::cos(ph 95 G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
97 costheta); 96 costheta);
98 97
99 G4double KE = std::sqrt(cmMomentum*cmMomentu 98 G4double KE = std::sqrt(cmMomentum*cmMomentum + protonMass*protonMass)
100 - protonMass; 99 - protonMass;
101 G4DynamicParticle* daughterparticle = 100 G4DynamicParticle* daughterparticle =
102 new G4DynamicParticle(G4MT_daughters[1], d 101 new G4DynamicParticle(G4MT_daughters[1], direction, KE, protonMass);
103 products->PushProducts(daughterparticle); 102 products->PushProducts(daughterparticle);
104 103
105 KE = std::sqrt(cmMomentum*cmMomentum + nucle 104 KE = std::sqrt(cmMomentum*cmMomentum + nucleusMass*nucleusMass) - nucleusMass;
106 daughterparticle = 105 daughterparticle =
107 new G4DynamicParticle(G4MT_daughters[0], - 106 new G4DynamicParticle(G4MT_daughters[0], -1.0*direction, KE, nucleusMass);
108 products->PushProducts(daughterparticle); 107 products->PushProducts(daughterparticle);
109 108
110 // Energy conservation check 109 // Energy conservation check
111 // For proton decays, do final energy check 110 // For proton decays, do final energy check against reaction Q value
112 // which is well-measured using atomic mass 111 // which is well-measured using atomic mass differences. Nuclear masses
113 // should not be used since they are not usu 112 // should not be used since they are not usually directly measured and we
114 // always decay atoms and not fully stripped 113 // always decay atoms and not fully stripped nuclei.
115 /* 114 /*
116 G4int nProd = products->entries(); 115 G4int nProd = products->entries();
117 G4DynamicParticle* temp = 0; 116 G4DynamicParticle* temp = 0;
118 G4double Esum = 0.0; 117 G4double Esum = 0.0;
119 for (G4int i = 0; i < nProd; i++) { 118 for (G4int i = 0; i < nProd; i++) {
120 temp = products->operator[](i); 119 temp = products->operator[](i);
121 Esum += temp->GetKineticEnergy(); 120 Esum += temp->GetKineticEnergy();
122 } 121 }
123 G4double eCons = (transitionQ - Esum)/keV; 122 G4double eCons = (transitionQ - Esum)/keV;
124 if (eCons > 1.e-07) G4cout << " Proton decay 123 if (eCons > 1.e-07) G4cout << " Proton decay check: Ediff (keV) = " << eCons << G4endl;
125 */ 124 */
126 return products; 125 return products;
127 } 126 }
128 127
129 128
130 void G4ProtonDecay::DumpNuclearInfo() 129 void G4ProtonDecay::DumpNuclearInfo()
131 { 130 {
132 G4cout << " G4ProtonDecay for parent nucleus 131 G4cout << " G4ProtonDecay for parent nucleus " << GetParentName() << G4endl;
133 G4cout << " decays to " << GetDaughterName(0 132 G4cout << " decays to " << GetDaughterName(0) << " + " << GetDaughterName(1)
134 << " with branching ratio " << GetBR( 133 << " with branching ratio " << GetBR() << "% and Q value "
135 << transitionQ << G4endl; 134 << transitionQ << G4endl;
136 } 135 }
137 136
138 137