Geant4  10.02
G4PionPlusField.cc
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28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4PionPlusField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4PionPlusField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh"
45 #include "G4PionPlus.hh"
46 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh"
48 
50  : G4VNuclearField(nucleus)
51 {
52  theCoeff = coeff;
53 }
54 
55 
57 { }
58 
60 {
61 // Field is 0 out of the nucleus!
62  if(aPosition.mag() >= radius) return 0.0;
63 
64  G4double pionPlusMass = G4PionPlus::PionPlus()->GetPDGMass();
65 
67  G4int Z = theNucleus->GetCharge();
69  G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
70  G4double reducedMass = pionPlusMass*nucleusMass/(pionPlusMass+nucleusMass);
71 
73  G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
74 
75  return 2.*pi*hbarc*hbarc/reducedMass*(1+pionPlusMass/nucleonMass)*theCoeff*density + GetBarrier();
76 }
77 
78 
80 {
82  G4int Z = theNucleus->GetCharge();
83  G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + G4Pow::GetInstance()->Z13(A));
84  return coulombBarrier;
85 }
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
static const double MeV
Definition: G4SIunits.hh:211
virtual G4int GetCharge()=0
CLHEP::Hep3Vector G4ThreeVector
virtual const G4VNuclearDensity * GetNuclearDensity() const =0
virtual G4int GetMassNumber()=0
virtual ~G4PionPlusField()
int G4int
Definition: G4Types.hh:78
G4double density
Definition: TRTMaterials.hh:39
virtual G4double GetField(const G4ThreeVector &aPosition)
G4double Z13(G4int Z) const
Definition: G4Pow.hh:127
double A(double temperature)
static G4PionPlus * PionPlus()
Definition: G4PionPlus.cc:98
const G4double radius
G4double GetPDGMass() const
G4double GetDensity(const G4ThreeVector &aPosition) const
static const double pi
Definition: G4SIunits.hh:74
static G4double GetBindingEnergy(const G4int A, const G4int Z)
G4V3DNucleus * theNucleus
G4PionPlusField(G4V3DNucleus *nucleus, G4double coeff=0.042 *CLHEP::fermi)
double G4double
Definition: G4Types.hh:76
virtual G4double GetBarrier()
G4double bindingEnergy(G4int A, G4int Z)