Geant4  10.01
G4PionMinusField.cc
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28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4PionMinusField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4PionMinusField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh"
45 #include "G4PionMinus.hh"
46 #include "G4HadTmpUtil.hh"
47 
49  : G4VNuclearField(nucleus)
50 {
51  theCoeff = coeff;
52 }
53 
54 
56 { }
57 
59 {
60 // Field is 0 out of the nucleus!
61  if(aPosition.mag() >= radius) return 0.0;
62 
64  G4int Z = theNucleus->GetCharge();
65  G4double pionMinusMass = G4PionMinus::PionMinus()->GetPDGMass();
67  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
68  G4double reducedMass = pionMinusMass*nucleusMass/(pionMinusMass+nucleusMass);
69 
71  G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
72 
73  return 2.*pi*hbarc*hbarc/reducedMass*(1+pionMinusMass/nucleonMass)*theCoeff*density + GetBarrier();
74 }
75 
76 
78 {
80  G4int Z = theNucleus->GetCharge();
81  G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
82  return -coulombBarrier;
83 }
84 
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static const double MeV
Definition: G4SIunits.hh:193
virtual ~G4PionMinusField()
virtual G4int GetCharge()=0
CLHEP::Hep3Vector G4ThreeVector
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
const G4double pi
virtual G4int GetMassNumber()=0
virtual G4double GetField(const G4ThreeVector &aPosition)
int G4int
Definition: G4Types.hh:78
G4double density
Definition: TRTMaterials.hh:39
G4PionMinusField(G4V3DNucleus *nucleus, G4double coeff=0.042 *CLHEP::fermi)
static const G4double A[nN]
const G4double radius
G4double GetPDGMass() const
G4double GetDensity(const G4ThreeVector &aPosition) const
static G4double GetBindingEnergy(const G4int A, const G4int Z)
int G4lrint(double ad)
Definition: templates.hh:163
static G4PionMinus * PionMinus()
Definition: G4PionMinus.cc:98
G4V3DNucleus * theNucleus
virtual G4double GetBarrier()
double G4double
Definition: G4Types.hh:76
G4double bindingEnergy(G4int A, G4int Z)