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G4NeutronField.cc
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27 // -------------------------------------------------------------------
28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4NeutronField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4NeutronField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4VNuclearDensity.hh"
43 #include "G4FermiMomentum.hh"
44 
46  G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity())
47 {
48  theA = theNucleus->GetMassNumber();
49  theZ = theNucleus->GetCharge();
50  theFermi.Init(theA, theZ);
51  theR = 2.*theNucleus->GetOuterRadius();
52  for (G4double aR=0.;aR<theR; aR+=0.3*fermi)
53  {
54  G4ThreeVector aPosition(0,0,aR);
55  G4double density = GetDensity(aPosition);
56  G4double fermiMom = GetFermiMomentum(density);
57  theFermiMomBuffer.push_back(fermiMom);
58  }
59  {
60  G4ThreeVector aPosition(0,0,theR);
61  G4double density = GetDensity(aPosition);
62  G4double fermiMom = GetFermiMomentum(density);
63  theFermiMomBuffer.push_back(fermiMom);
64  }
65  {
66  G4ThreeVector aPosition(0,0,theR+0.001*fermi);
67  theFermiMomBuffer.push_back(0);
68  }
69  {
70  G4ThreeVector aPosition(0,0,1.*m);
71  theFermiMomBuffer.push_back(0);
72  }
73 }
74 
76 { }
77 
79 {
80  G4double x = aPosition.mag();
81  unsigned int index = static_cast<unsigned int>(x/(0.3*fermi));
82  if( (index+2) > theFermiMomBuffer.size()) return theFermiMomBuffer.back();
83  G4double y1 = theFermiMomBuffer[index];
84  G4double y2 = theFermiMomBuffer[index+1];
85  G4double x1 = (0.3*fermi)*index;
86  G4double x2 = (0.3*fermi)*(index+1);
87  G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1);
88  return -1*(fermiMom*fermiMom)/(2*neutron_mass_c2);
89 }
90 
92 {
93 /*
94  * G4double A = theNucleus->GetMassNumber();
95  * G4double Z = theNucleus->GetCharge();
96  *
97  * return G4NucleiPropertiesTable::GetBindingEnergy(Z, A)/A;
98  */
99  return 0.;
100 }
101 
102 
103 
104 
105 
106 
virtual G4int GetCharge()=0
virtual G4int GetMassNumber()=0
G4NeutronField(G4V3DNucleus *nucleus)
tuple x
Definition: test.py:50
virtual G4double GetField(const G4ThreeVector &aPosition)
virtual G4double GetOuterRadius()=0
static constexpr double m
Definition: G4SIunits.hh:129
float neutron_mass_c2
Definition: hepunit.py:276
void Init(G4int anA, G4int aZ)
G4V3DNucleus * theNucleus
virtual G4double GetBarrier()
double G4double
Definition: G4Types.hh:76
static constexpr double fermi
Definition: G4SIunits.hh:103
double mag() const
virtual ~G4NeutronField()