Geant4_10
G4AntiProtonField.cc
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28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4AntiProtonField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4AntiProtonField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh"
45 #include "G4ParticleDefinition.hh"
46 #include "G4AntiProton.hh"
47 #include "G4HadTmpUtil.hh"
48 
50  : G4VNuclearField(nucleus)
51 {
52  theCoeff = coeff;
53 }
54 
55 
57 { }
58 
59 
60 
61 
63 {
64 // Field is 0 out of the nucleus!
65  if(aPosition.mag() >= radius) return 0.0;
66 
68  G4double antiProtonMass = anAntiProton->GetPDGMass();
69 
73  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
74  G4double reducedMass = antiProtonMass*nucleusMass/(antiProtonMass+nucleusMass);
75 
77 
78  return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density+GetBarrier();
79 }
80 
81 
83 {
86  G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
87  return -coulombBarrier;
88 }
89 
90 
91 
92 
93 
94 
95 
virtual G4int GetCharge()=0
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
virtual G4int GetMassNumber()=0
static G4AntiProton * AntiProtonDefinition()
Definition: G4AntiProton.cc:88
int G4int
Definition: G4Types.hh:78
G4double density
Definition: TRTMaterials.hh:39
Float_t Z
Definition: plot.C:39
float proton_mass_c2
Definition: hepunit.py:275
virtual ~G4AntiProtonField()
float neutron_mass_c2
Definition: hepunit.py:276
const G4double radius
G4double GetPDGMass() const
G4double GetDensity(const G4ThreeVector &aPosition) const
static G4double GetBindingEnergy(const G4int A, const G4int Z)
G4V3DNucleus * theNucleus
virtual G4double GetField(const G4ThreeVector &aPosition)
double G4double
Definition: G4Types.hh:76
G4double bindingEnergy(G4int A, G4int Z)
double mag() const
virtual G4double GetBarrier()
G4AntiProtonField(G4V3DNucleus *nucleus, G4double coeff=1.53 *CLHEP::fermi)