Geant4  10.02.p02
G4SigmaMinusField.cc
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28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4SigmaMinusField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4SigmaMinusField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh"
45 #include "G4SigmaMinus.hh"
46 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh"
48 
50  : G4VNuclearField(nucleus)
51 {
52  theCoeff = coeff;
53 }
54 
56 { }
57 
59 {
60 // Field is 0 out of the nucleus!
61  if(aPosition.mag() >= radius) return 0.0;
62 
63  G4double sigmaMinusMass = G4SigmaMinus::SigmaMinus()->GetPDGMass();
64 
66  G4int Z = theNucleus->GetCharge();
68  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
69  G4double reducedMass = sigmaMinusMass*nucleusMass/(sigmaMinusMass+nucleusMass);
70 
71  const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
72  G4double density = nuclearDensity->GetDensity(aPosition);
73 
74  return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density+GetBarrier();
75 }
76 
78 {
81  G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + G4Pow::GetInstance()->A13(A));
82  return -coulombBarrier;
83 }
84 
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
virtual G4double GetBarrier()
G4SigmaMinusField(G4V3DNucleus *nucleus, G4double coeff=0.36 *CLHEP::fermi)
static const double MeV
Definition: G4SIunits.hh:211
virtual G4int GetCharge()=0
CLHEP::Hep3Vector G4ThreeVector
virtual G4double GetField(const G4ThreeVector &aPosition)
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
virtual G4int GetMassNumber()=0
virtual ~G4SigmaMinusField()
int G4int
Definition: G4Types.hh:78
G4double density
Definition: TRTMaterials.hh:39
double A(double temperature)
static G4SigmaMinus * SigmaMinus()
const G4double radius
G4double GetPDGMass() const
G4double GetDensity(const G4ThreeVector &aPosition) const
static const double pi
Definition: G4SIunits.hh:74
G4double A13(G4double A) const
Definition: G4Pow.hh:132
static G4double GetBindingEnergy(const G4int A, const G4int Z)
G4V3DNucleus * theNucleus
double G4double
Definition: G4Types.hh:76
G4double bindingEnergy(G4int A, G4int Z)