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G4ee2KNeutralModel.cc
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27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4ee2KNeutralModel
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 09.07.2008
37 //
38 // Modifications:
39 //
40 //
41 // -------------------------------------------------------------------
42 //
43 
44 
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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47 
48 #include "G4ee2KNeutralModel.hh"
49 #include "Randomize.hh"
50 #include "G4PhysicalConstants.hh"
51 #include "G4SystemOfUnits.hh"
52 #include "G4KaonZeroLong.hh"
53 #include "G4KaonZeroShort.hh"
54 #include "G4DynamicParticle.hh"
55 #include "G4PhysicsVector.hh"
56 #include "G4PhysicsLinearVector.hh"
57 #include "G4eeCrossSections.hh"
58 
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
60 
61 using namespace std;
62 
63 G4ee2KNeutralModel::G4ee2KNeutralModel(G4eeCrossSections* cr,
64  G4double maxkinEnergy,
65  G4double binWidth)
66 : G4Vee2hadrons(cr,
67  2.0*G4KaonZeroLong::KaonZeroLong()->GetPDGMass(),
68  maxkinEnergy,
69  binWidth)
70 {
71  G4cout << "####G4ee2KNeutralModel####" <<G4endl;
72 
73  massK = G4KaonZeroLong::KaonZeroLong()->GetPDGMass();
74  massPhi = 1019.46*MeV;
75 }
76 
77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78 
79 G4ee2KNeutralModel::~G4ee2KNeutralModel()
80 {}
81 
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83 
84 G4double G4ee2KNeutralModel::PeakEnergy() const
85 {
86  return massPhi;
87 }
88 
89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90 
91 G4double G4ee2KNeutralModel::ComputeCrossSection(G4double e) const
92 {
93  return cross->CrossSection2Kneutral(e);
94 }
95 
96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
97 
98 void G4ee2KNeutralModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
99  G4double e, const G4ThreeVector& direction)
100 {
101 
102  G4double tkin = 0.5*e - massK;
103  if(tkin < 0.0) tkin = 0.0;
104 
105  G4double cost;
106  do {
107  cost = 2.0*G4UniformRand() - 1.0;
108  // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
109  } while( G4UniformRand() > 1.0 - cost*cost );
110 
111  G4double sint = sqrt(1.0 - cost*cost);
112  G4double phi = twopi * G4UniformRand();
113 
114  G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
115  dir.rotateUz(direction);
116 
117  // create G4DynamicParticle objects
118  G4DynamicParticle* p1 =
119  new G4DynamicParticle(G4KaonZeroLong::KaonZeroLong(),dir,tkin);
120  G4DynamicParticle* p2 =
121  new G4DynamicParticle(G4KaonZeroShort::KaonZeroShort(),-dir,tkin);
122  newp->push_back(p1);
123  newp->push_back(p2);
124 }
125 
126 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
127