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G4SigmaZeroField.cc
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28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4SigmaZeroField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4SigmaZeroField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4NucleiProperties.hh"
42 #include "G4VNuclearDensity.hh"
43 #include "G4FermiMomentum.hh"
44 #include "G4SigmaZero.hh"
45 #include "G4HadTmpUtil.hh"
46 
48  : G4VNuclearField(nucleus)
49 {
50  theCoeff = coeff;
51 }
52 
54 { }
55 
57 {
58 // Field is 0 out of the nucleus!
59  if(aPosition.mag() >= radius) return 0.0;
60 
61  G4double sigmaZeroMass = G4SigmaZero::SigmaZero()->GetPDGMass();
62 
64  G4int Z = theNucleus->GetCharge();
66  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
67  G4double reducedMass = sigmaZeroMass*nucleusMass/(sigmaZeroMass+nucleusMass);
68 
69  const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
70  G4double density = nuclearDensity->GetDensity(aPosition);
71 
72  return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density;
73 }
74 
75 
77 {
78  return 0.;
79 }
80 
virtual G4int GetCharge()=0
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
G4SigmaZeroField(G4V3DNucleus *nucleus, G4double coeff=0.36 *CLHEP::fermi)
virtual G4int GetMassNumber()=0
int G4int
Definition: G4Types.hh:78
static G4SigmaZero * SigmaZero()
Definition: G4SigmaZero.cc:99
G4double density
Definition: TRTMaterials.hh:39
virtual G4double GetBarrier()
float proton_mass_c2
Definition: hepunit.py:275
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 ~G4SigmaZeroField()
virtual G4double GetField(const G4ThreeVector &aPosition)
double G4double
Definition: G4Types.hh:76
G4double bindingEnergy(G4int A, G4int Z)
double mag() const