source: trunk/source/processes/electromagnetic/highenergy/src/G4ee2KNeutralModel.cc @ 1337

Last change on this file since 1337 was 1337, checked in by garnier, 14 years ago

tag geant4.9.4 beta 1 + modifs locales
File size: 4.7 KB
Line 
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25//
26// $Id: G4ee2KNeutralModel.cc,v 1.2 2009/02/20 16:38:33 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-04-beta-01 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class header file
32//
33//
34// File name:     G4ee2KNeutralModel
35//
36// Author:        Vladimir Ivanchenko
37//
38// Creation date: 09.07.2008
39//
40// Modifications:
41//
42//
43// -------------------------------------------------------------------
44//
45
46
47//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
48//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
49
50#include "G4ee2KNeutralModel.hh"
51#include "Randomize.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
61using namespace std;
62
63G4ee2KNeutralModel::G4ee2KNeutralModel(G4eeCrossSections* cr):
64  cross(cr)
65{
66  massK = G4KaonZeroLong::KaonZeroLong()->GetPDGMass();
67  massPhi = 1019.46*MeV;
68}
69
70//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
71
72G4ee2KNeutralModel::~G4ee2KNeutralModel()
73{}
74
75//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
76
77G4double G4ee2KNeutralModel::ThresholdEnergy() const
78{
79  return 2.0*massK;
80}
81
82//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83
84G4double G4ee2KNeutralModel::PeakEnergy() const
85{
86  return massPhi;
87}
88
89//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90
91G4double G4ee2KNeutralModel::ComputeCrossSection(G4double e) const
92{
93  G4double ee = std::min(HighEnergy(),e);
94  return cross->CrossSection2Kneutral(ee);
95}
96
97//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
98
99G4PhysicsVector* G4ee2KNeutralModel::PhysicsVector(G4double emin, 
100                                                   G4double emax) const
101{
102  G4double tmin = std::max(emin, 2.0*massK);
103  G4double tmax = std::max(tmin, emax);
104  G4int nbins = (G4int)((tmax - tmin)/(1.0*MeV));
105  G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
106  v->SetSpline(true);
107  return v;
108}
109
110//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
111
112void G4ee2KNeutralModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
113            G4double e, const G4ThreeVector& direction) 
114{
115
116  G4double tkin = 0.5*e - massK;
117  if(tkin < 0.0) tkin = 0.0;
118
119  G4double cost;
120  do {
121    cost = 2.0*G4UniformRand() - 1.0;
122  } while( G4UniformRand() > 1.0 - cost*cost );
123
124  G4double sint = sqrt(1.0 - cost*cost);
125  G4double phi  = twopi * G4UniformRand();
126
127  G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
128  dir.rotateUz(direction);
129
130  // create G4DynamicParticle objects
131  G4DynamicParticle* p1 = 
132     new G4DynamicParticle(G4KaonZeroLong::KaonZeroLong(),dir,tkin);
133  G4DynamicParticle* p2 = 
134     new G4DynamicParticle(G4KaonZeroShort::KaonZeroShort(),-dir,tkin);
135  newp->push_back(p1);
136  newp->push_back(p2);
137}
138
139//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
140
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