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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: G4SigmaPlusField.cc 32 // File name: G4SigmaPlusField.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 "G4SigmaPlusField.hh" 39 #include "G4SigmaPlusField.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 "G4SigmaPlus.hh" 45 #include "G4SigmaPlus.hh"
46 #include "G4HadTmpUtil.hh" 46 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh" 47 #include "G4Pow.hh"
48 48
49 G4SigmaPlusField::G4SigmaPlusField(G4V3DNucleu 49 G4SigmaPlusField::G4SigmaPlusField(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 G4SigmaPlusField::~G4SigmaPlusField() 56 G4SigmaPlusField::~G4SigmaPlusField()
57 { } 57 { }
58 58
59 G4double G4SigmaPlusField::GetField(const G4Th 59 G4double G4SigmaPlusField::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 G4double sigmaPlusMass = G4SigmaPlus::SigmaP 64 G4double sigmaPlusMass = G4SigmaPlus::SigmaPlus()->GetPDGMass();
65 65
66 G4int A = theNucleus->GetMassNumber(); 66 G4int A = theNucleus->GetMassNumber();
67 G4int Z = theNucleus->GetCharge(); 67 G4int Z = theNucleus->GetCharge();
68 G4double bindingEnergy = G4NucleiProperties: 68 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(A, Z);
69 G4double nucleusMass = Z*proton_mass_c2+(A-Z 69 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
70 G4double reducedMass = sigmaPlusMass*nucleus 70 G4double reducedMass = sigmaPlusMass*nucleusMass/(sigmaPlusMass+nucleusMass);
71 71
72 const G4VNuclearDensity * nuclearDensity=the 72 const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
73 G4double density = nuclearDensity->GetDensit 73 G4double density = nuclearDensity->GetDensity(aPosition);
74 74
75 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)* 75 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density+GetBarrier();
76 } 76 }
77 77
78 G4double G4SigmaPlusField::GetBarrier() 78 G4double G4SigmaPlusField::GetBarrier()
79 { 79 {
80 G4double A = theNucleus->GetMassNumber(); 80 G4double A = theNucleus->GetMassNumber();
81 G4double Z = theNucleus->GetCharge(); 81 G4double Z = theNucleus->GetCharge();
82 G4double coulombBarrier = (1.44/1.14) * MeV 82 G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + G4Pow::GetInstance()->A13(A));
83 return coulombBarrier; 83 return coulombBarrier;
84 } 84 }
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