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G4PionZeroField.cc
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27 // -------------------------------------------------------------------
28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4PionZeroField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4PionZeroField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4NucleiProperties.hh"
42 #include "G4VNuclearDensity.hh"
43 #include "G4FermiMomentum.hh"
44 #include "G4PionZero.hh"
45 #include "G4HadTmpUtil.hh"
46 
48  : G4VNuclearField(nucleus)
49 {
50  theCoeff = coeff;
51 }
52 
53 
55 { }
56 
58 {
59 // Field is 0 out of the nucleus!
60  if(aPosition.mag() >= radius) return 0.0;
61 
62  G4double pionZeroMass = G4PionZero::PionZero()->GetPDGMass();
65 
67  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
68  G4double reducedMass = pionZeroMass*nucleusMass/(pionZeroMass+nucleusMass);
69 
70 
71  G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition);
72  G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
73 
74  return 2.*pi*hbarc*hbarc/reducedMass*(1+pionZeroMass/nucleonMass)*theCoeff*density;
75 }
76 
78 {
79  return 0;
80 }
G4double GetDensity(const G4ThreeVector &aPosition) const
static constexpr double hbarc
virtual ~G4PionZeroField()
virtual G4double GetField(const G4ThreeVector &aPosition)
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
G4double GetPDGMass() const
static constexpr double neutron_mass_c2
static constexpr double proton_mass_c2
Float_t Z
static G4double GetBindingEnergy(const G4int A, const G4int Z)
double G4double
Definition: G4Types.hh:76
double A(double temperature)
virtual G4int GetCharge()=0
G4PionZeroField(G4V3DNucleus *nucleus, G4double coeff=0.042 *CLHEP::fermi)
virtual G4int GetMassNumber()=0
const G4double radius
double mag() const
int G4int
Definition: G4Types.hh:78
G4V3DNucleus * theNucleus
static G4PionZero * PionZero()
Definition: G4PionZero.cc:108
static constexpr double pi
Definition: G4SIunits.hh:75
virtual G4double GetBarrier()
G4double bindingEnergy(G4int A, G4int Z)