Geant4  10.01
G4ProtonField.cc
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28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4ProtonField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4ProtonField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4VNuclearDensity.hh"
43 #include "G4FermiMomentum.hh"
44 #include "G4V3DNucleus.hh"
45 
47  G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity())
48 {
54  G4double aR=0;
55  while(aR<theRadius)
56  {
57  G4ThreeVector aPosition(0,0,aR);
58  G4double density = GetDensity(aPosition);
59  G4double fermiMom = GetFermiMomentum(density);
60  theFermiMomBuffer.push_back(fermiMom);
61  aR+=0.3*fermi;
62  }
63  {
64  G4ThreeVector aPosition(0,0,theRadius);
65  G4double density = GetDensity(aPosition);
66  G4double fermiMom = GetFermiMomentum(density);
67  theFermiMomBuffer.push_back(fermiMom);
68  }
69  {
70  G4ThreeVector aPosition(0,0,theRadius+0.001*fermi);
71  theFermiMomBuffer.push_back(0);
72  }
73  {
74  G4ThreeVector aPosition(0,0,1.*m);
75  theFermiMomBuffer.push_back(0);
76  }
77 }
78 
79 
81 { }
82 
84 {
85 //G4cout << " Fermi Potential " << (fermiMom*fermiMom)/(2*proton_mass_c2) <<G4endl;
86  G4double x = aPosition.mag();
87  unsigned int index = static_cast<unsigned int>(x/(0.3*fermi));
88  if((index+2) > theFermiMomBuffer.size()) return theFermiMomBuffer.back();
89  G4double y1 = theFermiMomBuffer[index];
90  G4double y2 = theFermiMomBuffer[index+1];
91  G4double x1 = (0.3*fermi)*index;
92  G4double x2 = (0.3*fermi)*(index+1);
93  G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1);
94  G4double y = -1*(fermiMom*fermiMom)/(2*proton_mass_c2)+theBarrier;
95 // G4cout <<" Protonfield test "<<index<<" "<< x1<<" "<<y1<<" "<<x2<<" "<<y2<<" "<<x<<" "<<y<<" "<<theBarrier<<G4endl;
96  return y;
97 }
98 
100 {
101  G4double coulombBarrier = (1.44/1.14) * MeV * theZ / (1.0 + std::pow(theA,1./3.));
102 //GF G4double bindingEnergy = G4NucleiPropertiesTable::GetBindingEnergy(Z, A);
104 /*
105  * G4cout << " coulombBarrier/bindingEnergy : "
106  * << coulombBarrier << " /" << bindingEnergy << G4endl;
107  */
108  return bindingEnergy/theA+coulombBarrier;
109 }
static const double MeV
Definition: G4SIunits.hh:193
virtual G4int GetCharge()=0
CLHEP::Hep3Vector G4ThreeVector
virtual G4int GetMassNumber()=0
G4double theRadius
G4ProtonField(G4V3DNucleus *nucleus)
virtual ~G4ProtonField()
virtual G4double GetOuterRadius()=0
G4double density
Definition: TRTMaterials.hh:39
virtual G4double GetField(const G4ThreeVector &aPosition)
G4double GetFermiMomentum(const G4double aDensity)
void Init(G4int anA, G4int aZ)
G4double theBarrier
G4V3DNucleus * theNucleus
virtual G4double GetBarrier()
static const double m
Definition: G4SIunits.hh:110
double G4double
Definition: G4Types.hh:76
G4double bindingEnergy(G4int A, G4int Z)
G4double GetDensity(const G4ThreeVector &aPosition)
static const double fermi
Definition: G4SIunits.hh:93
G4FermiMomentum theFermi
std::vector< G4double > theFermiMomBuffer