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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: G4SigmaMinusField.cc 32 // File name: G4SigmaMinusField.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 "G4SigmaMinusField.hh" 39 #include "G4SigmaMinusField.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 "G4SigmaMinus.hh" 45 #include "G4SigmaMinus.hh"
46 #include "G4HadTmpUtil.hh" 46 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh" <<
48 47
49 G4SigmaMinusField::G4SigmaMinusField(G4V3DNucl 48 G4SigmaMinusField::G4SigmaMinusField(G4V3DNucleus * nucleus, G4double coeff)
50 : G4VNuclearField(nucleus) 49 : G4VNuclearField(nucleus)
51 { 50 {
52 theCoeff = coeff; 51 theCoeff = coeff;
53 } 52 }
54 53
55 G4SigmaMinusField::~G4SigmaMinusField() 54 G4SigmaMinusField::~G4SigmaMinusField()
56 { } 55 { }
57 56
58 G4double G4SigmaMinusField::GetField(const G4T 57 G4double G4SigmaMinusField::GetField(const G4ThreeVector & aPosition)
59 { 58 {
60 // Field is 0 out of the nucleus! 59 // Field is 0 out of the nucleus!
61 if(aPosition.mag() >= radius) return 0.0; 60 if(aPosition.mag() >= radius) return 0.0;
62 61
63 G4double sigmaMinusMass = G4SigmaMinus::Sigm 62 G4double sigmaMinusMass = G4SigmaMinus::SigmaMinus()->GetPDGMass();
64 63
65 G4int A = theNucleus->GetMassNumber(); 64 G4int A = theNucleus->GetMassNumber();
66 G4int Z = theNucleus->GetCharge(); 65 G4int Z = theNucleus->GetCharge();
67 G4double bindingEnergy = G4NucleiProperties: 66 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(A, Z);
68 G4double nucleusMass = Z*proton_mass_c2+(A-Z 67 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
69 G4double reducedMass = sigmaMinusMass*nucleu 68 G4double reducedMass = sigmaMinusMass*nucleusMass/(sigmaMinusMass+nucleusMass);
70 69
71 const G4VNuclearDensity * nuclearDensity=the 70 const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
72 G4double density = nuclearDensity->GetDensit 71 G4double density = nuclearDensity->GetDensity(aPosition);
73 72
74 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)* 73 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density+GetBarrier();
75 } 74 }
76 75
77 G4double G4SigmaMinusField::GetBarrier() 76 G4double G4SigmaMinusField::GetBarrier()
78 { 77 {
79 G4double A = theNucleus->GetMassNumber(); 78 G4double A = theNucleus->GetMassNumber();
80 G4double Z = theNucleus->GetCharge(); 79 G4double Z = theNucleus->GetCharge();
81 G4double coulombBarrier = (1.44/1.14) * MeV << 80 G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
82 return -coulombBarrier; 81 return -coulombBarrier;
83 } 82 }
84 83
85 84