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G4ProtonField.cc
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27 // -------------------------------------------------------------------
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 #include "G4Pow.hh"
46 
48  G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity())
49 {
50  theA = theNucleus->GetMassNumber();
51  theZ = theNucleus->GetCharge();
52  theBarrier = GetBarrier();
53  theRadius = 2.*theNucleus->GetOuterRadius();
54  theFermi.Init(theA, theZ);
55  for (G4double aR=0.;aR<theRadius; aR+=0.3*fermi)
56  {
57  G4ThreeVector aPosition(0,0,aR);
58  G4double density = GetDensity(aPosition);
59  G4double fermiMom = GetFermiMomentum(density);
60  theFermiMomBuffer.push_back(fermiMom);
61  }
62  {
63  G4ThreeVector aPosition(0,0,theRadius);
64  G4double density = GetDensity(aPosition);
65  G4double fermiMom = GetFermiMomentum(density);
66  theFermiMomBuffer.push_back(fermiMom);
67  }
68  {
69  G4ThreeVector aPosition(0,0,theRadius+0.001*fermi);
70  theFermiMomBuffer.push_back(0);
71  }
72  {
73  G4ThreeVector aPosition(0,0,1.*m);
74  theFermiMomBuffer.push_back(0);
75  }
76 }
77 
78 
80 { }
81 
83 {
84 //G4cout << " Fermi Potential " << (fermiMom*fermiMom)/(2*proton_mass_c2) <<G4endl;
85  G4double x = aPosition.mag();
86  unsigned int index = static_cast<unsigned int>(x/(0.3*fermi));
87  if((index+2) > theFermiMomBuffer.size()) return theFermiMomBuffer.back();
88  G4double y1 = theFermiMomBuffer[index];
89  G4double y2 = theFermiMomBuffer[index+1];
90  G4double x1 = (0.3*fermi)*index;
91  G4double x2 = (0.3*fermi)*(index+1);
92  G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1);
93  G4double y = -1*(fermiMom*fermiMom)/(2*proton_mass_c2)+theBarrier;
94 // G4cout <<" Protonfield test "<<index<<" "<< x1<<" "<<y1<<" "<<x2<<" "<<y2<<" "<<x<<" "<<y<<" "<<theBarrier<<G4endl;
95  return y;
96 }
97 
99 {
100  G4double coulombBarrier = (1.44/1.14) * MeV * theZ / (1.0 + G4Pow::GetInstance()->Z13(theA));
101 //GF G4double bindingEnergy = G4NucleiPropertiesTable::GetBindingEnergy(Z, A);
103 /*
104  * G4cout << " coulombBarrier/bindingEnergy : "
105  * << coulombBarrier << " /" << bindingEnergy << G4endl;
106  */
107  return bindingEnergy/theA+coulombBarrier;
108 }
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
virtual G4int GetCharge()=0
virtual G4int GetMassNumber()=0
tuple x
Definition: test.py:50
G4ProtonField(G4V3DNucleus *nucleus)
virtual ~G4ProtonField()
virtual G4double GetOuterRadius()=0
G4double Z13(G4int Z) const
Definition: G4Pow.hh:127
static constexpr double m
Definition: G4SIunits.hh:129
virtual G4double GetField(const G4ThreeVector &aPosition)
float proton_mass_c2
Definition: hepunit.py:275
void Init(G4int anA, G4int aZ)
G4V3DNucleus * theNucleus
virtual G4double GetBarrier()
static constexpr double MeV
Definition: G4SIunits.hh:214
double G4double
Definition: G4Types.hh:76
static constexpr double fermi
Definition: G4SIunits.hh:103
G4double bindingEnergy(G4int A, G4int Z)
double mag() const