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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: G4PionMinusField.cc 32 // File name: G4PionMinusField.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 "G4PionMinusField.hh" 39 #include "G4PionMinusField.hh"
40 #include "G4PhysicalConstants.hh" 40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh" 41 #include "G4SystemOfUnits.hh"
42 #include "G4NucleiProperties.hh" 42 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh" 43 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh" 44 #include "G4FermiMomentum.hh"
45 #include "G4PionMinus.hh" 45 #include "G4PionMinus.hh"
46 #include "G4HadTmpUtil.hh" 46 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh" 47 #include "G4Pow.hh"
48 48
49 G4PionMinusField::G4PionMinusField(G4V3DNucleu 49 G4PionMinusField::G4PionMinusField(G4V3DNucleus * nucleus, G4double coeff)
50 : G4VNuclearField(nucleus) 50 : G4VNuclearField(nucleus)
51 { 51 {
52 theCoeff = coeff; 52 theCoeff = coeff;
53 } 53 }
54 54
55 55
56 G4PionMinusField::~G4PionMinusField() 56 G4PionMinusField::~G4PionMinusField()
57 { } 57 { }
58 58
59 G4double G4PionMinusField::GetField(const G4Th 59 G4double G4PionMinusField::GetField(const G4ThreeVector & aPosition)
60 { 60 {
61 // Field is 0 out of the nucleus! 61 // Field is 0 out of the nucleus!
62 if(aPosition.mag() >= radius) return 0.0; 62 if(aPosition.mag() >= radius) return 0.0;
63 63
64 G4int A = theNucleus->GetMassNumber(); 64 G4int A = theNucleus->GetMassNumber();
65 G4int Z = theNucleus->GetCharge(); 65 G4int Z = theNucleus->GetCharge();
66 G4double pionMinusMass = G4PionMinus::PionMi 66 G4double pionMinusMass = G4PionMinus::PionMinus()->GetPDGMass();
67 G4double bindingEnergy = G4NucleiProperties: 67 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
68 G4double nucleusMass = Z*proton_mass_c2+(A-Z 68 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
69 G4double reducedMass = pionMinusMass*nucleus 69 G4double reducedMass = pionMinusMass*nucleusMass/(pionMinusMass+nucleusMass);
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+pionMinusMass/nucleonMass)*theCoeff*density + GetBarrier();
75 } 75 }
76 76
77 77
78 G4double G4PionMinusField::GetBarrier() 78 G4double G4PionMinusField::GetBarrier()
79 { 79 {
80 G4int A = theNucleus->GetMassNumber(); 80 G4int A = theNucleus->GetMassNumber();
81 G4int Z = theNucleus->GetCharge(); 81 G4int Z = theNucleus->GetCharge();
82 G4double coulombBarrier = (1.44/1.14) * MeV 82 G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + G4Pow::GetInstance()->Z13(A));
83 return -coulombBarrier; 83 return -coulombBarrier;
84 } 84 }
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