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25 //
26 //
27 // -------------------------------------------------------------------
28 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4KaonPlusField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38
39 #include "G4KaonPlusField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh"
45 #include "G4KaonPlus.hh"
46 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh"
48
49 G4KaonPlusField::G4KaonPlusField(G4V3DNucleus * nucleus, G4double coeff)
50 : G4VNuclearField(nucleus)
51 {
52 theCoeff = coeff;
53 }
54
55
56 G4KaonPlusField::~G4KaonPlusField()
57 { }
58
59 G4double G4KaonPlusField::GetField(const G4ThreeVector & aPosition)
60 {
61 // Field is 0 out of the nucleus!
62 if(aPosition.mag() >= radius) return 0.0;
63
64 G4double kaonMass = G4KaonPlus::KaonPlus()->GetPDGMass();
65
66 G4int A = theNucleus->GetMassNumber();
67 G4int Z = theNucleus->GetCharge();
68 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(A, Z);
69 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
70 G4double reducedMass = kaonMass*nucleusMass/(kaonMass+nucleusMass);
71
72 G4double density = theNucleus->GetNuclearDensity()->GetDensity(aPosition);
73
74 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density+GetBarrier();
75 }
76
77 G4double G4KaonPlusField::GetBarrier()
78 {
79 G4int A = theNucleus->GetMassNumber();
80 G4int Z = theNucleus->GetCharge();
81 G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + G4Pow::GetInstance()->Z13(A));
82 return coulombBarrier;
83 }
84
85
86