G4KaonZeroField.cc

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00026 //
00027 // -------------------------------------------------------------------
00028 //      GEANT 4 class implementation file 
00029 //
00030 //      CERN, Geneva, Switzerland
00031 //
00032 //      File name:     G4KaonZeroField.cc
00033 //
00034 //      Author:        Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
00035 // 
00036 //      Creation date: 5 June 2000
00037 // -------------------------------------------------------------------
00038 
00039 #include "G4KaonZeroField.hh"
00040 #include "G4PhysicalConstants.hh"
00041 #include "G4NucleiProperties.hh"
00042 #include "G4VNuclearDensity.hh"
00043 #include "G4FermiMomentum.hh"
00044 #include "G4KaonZero.hh"
00045 #include "G4HadTmpUtil.hh"
00046 
00047 G4KaonZeroField::G4KaonZeroField(G4V3DNucleus * nucleus, G4double coeff)
00048   : G4VNuclearField(nucleus)
00049 {
00050   theCoeff = coeff;
00051 }
00052 
00053 
00054 G4KaonZeroField::~G4KaonZeroField()
00055 { }
00056 
00057 G4double G4KaonZeroField::GetField(const G4ThreeVector & aPosition)
00058 {
00059 // Field is 0 out of the nucleus!
00060   if(aPosition.mag() >= radius) return 0.0;
00061 
00062   G4double kaonMass = G4KaonZero::KaonZero()->GetPDGMass();
00063 
00064   G4int A = theNucleus->GetMassNumber();
00065   G4int Z = theNucleus->GetCharge();
00066   G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(A, Z);
00067   G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
00068   G4double reducedMass = kaonMass*nucleusMass/(kaonMass+nucleusMass);
00069 
00070   G4double density = theNucleus->GetNuclearDensity()->GetDensity(aPosition);
00071 
00072   return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density;
00073 }
00074 
00075 G4double G4KaonZeroField::GetBarrier()
00076 {
00077   return 0;
00078 }
00079 
00080 
00081 
00082 
00083 

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