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27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // GEANT 4 class implementation file 28 // GEANT 4 class implementation file
29 // 29 //
30 // CERN, Geneva, Switzerland 30 // CERN, Geneva, Switzerland
31 // 31 //
32 // File name: G4PionZeroField.cc 32 // File name: G4PionZeroField.cc
33 // 33 //
34 // Author: Alessandro Brunengo (Al 34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 // 35 //
36 // Creation date: 5 June 2000 36 // Creation date: 5 June 2000
37 // ------------------------------------------- 37 // -------------------------------------------------------------------
38 38
39 #include "G4PionZeroField.hh" 39 #include "G4PionZeroField.hh"
40 #include "G4PhysicalConstants.hh" 40 #include "G4PhysicalConstants.hh"
41 #include "G4NucleiProperties.hh" 41 #include "G4NucleiProperties.hh"
42 #include "G4VNuclearDensity.hh" 42 #include "G4VNuclearDensity.hh"
43 #include "G4FermiMomentum.hh" 43 #include "G4FermiMomentum.hh"
44 #include "G4PionZero.hh" 44 #include "G4PionZero.hh"
45 #include "G4HadTmpUtil.hh" 45 #include "G4HadTmpUtil.hh"
46 46
47 G4PionZeroField::G4PionZeroField(G4V3DNucleus 47 G4PionZeroField::G4PionZeroField(G4V3DNucleus * nucleus, G4double coeff)
48 : G4VNuclearField(nucleus) 48 : G4VNuclearField(nucleus)
49 { 49 {
50 theCoeff = coeff; 50 theCoeff = coeff;
51 } 51 }
52 52
53 53
54 G4PionZeroField::~G4PionZeroField() 54 G4PionZeroField::~G4PionZeroField()
55 { } 55 { }
56 56
57 G4double G4PionZeroField::GetField(const G4Thr 57 G4double G4PionZeroField::GetField(const G4ThreeVector & aPosition)
58 { 58 {
59 // Field is 0 out of the nucleus! 59 // Field is 0 out of the nucleus!
60 if(aPosition.mag() >= radius) return 0.0; 60 if(aPosition.mag() >= radius) return 0.0;
61 61
62 G4double pionZeroMass = G4PionZero::PionZero 62 G4double pionZeroMass = G4PionZero::PionZero()->GetPDGMass();
63 G4int A = theNucleus->GetMassNumber(); 63 G4int A = theNucleus->GetMassNumber();
64 G4int Z = theNucleus->GetCharge(); 64 G4int Z = theNucleus->GetCharge();
65 65
66 G4double bindingEnergy = G4NucleiProperties: 66 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(A, Z);
67 G4double nucleusMass = Z*proton_mass_c2+(A-Z 67 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
68 G4double reducedMass = pionZeroMass*nucleusM 68 G4double reducedMass = pionZeroMass*nucleusMass/(pionZeroMass+nucleusMass);
69 69
70 70
71 G4double density = A*theNucleus->GetNuclearD 71 G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition);
72 G4double nucleonMass = (proton_mass_c2+neutr 72 G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
73 73
74 return 2.*pi*hbarc*hbarc/reducedMass*(1+pion 74 return 2.*pi*hbarc*hbarc/reducedMass*(1+pionZeroMass/nucleonMass)*theCoeff*density;
75 } 75 }
76 76
77 G4double G4PionZeroField::GetBarrier() 77 G4double G4PionZeroField::GetBarrier()
78 { 78 {
79 return 0; 79 return 0;
80 } 80 }
81 81