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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 <<
39 #include "G4SigmaMinusField.hh" 38 #include "G4SigmaMinusField.hh"
40 #include "G4PhysicalConstants.hh" <<
41 #include "G4SystemOfUnits.hh" <<
42 #include "G4NucleiProperties.hh" 39 #include "G4NucleiProperties.hh"
43 #include "G4VNuclearDensity.hh" 40 #include "G4VNuclearDensity.hh"
44 #include "G4FermiMomentum.hh" 41 #include "G4FermiMomentum.hh"
45 #include "G4SigmaMinus.hh" 42 #include "G4SigmaMinus.hh"
46 #include "G4HadTmpUtil.hh" 43 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh" <<
48 44
49 G4SigmaMinusField::G4SigmaMinusField(G4V3DNucl 45 G4SigmaMinusField::G4SigmaMinusField(G4V3DNucleus * nucleus, G4double coeff)
50 : G4VNuclearField(nucleus) 46 : G4VNuclearField(nucleus)
51 { 47 {
52 theCoeff = coeff; 48 theCoeff = coeff;
53 } 49 }
54 50
55 G4SigmaMinusField::~G4SigmaMinusField() 51 G4SigmaMinusField::~G4SigmaMinusField()
56 { } 52 { }
57 53
>> 54
>> 55 const G4SigmaMinusField & G4SigmaMinusField::operator=(const G4SigmaMinusField &)
>> 56 {
>> 57 throw G4HadronicException(__FILE__, __LINE__, "G4SigmaMinusField::operator= meant not to be accessible");
>> 58 return *this;
>> 59 }
>> 60
>> 61
>> 62 G4int G4SigmaMinusField::operator==(const G4SigmaMinusField &) const
>> 63 {
>> 64 throw G4HadronicException(__FILE__, __LINE__, "G4SigmaMinusField::operator== meant not to be accessible");
>> 65 return 0;
>> 66 }
>> 67
>> 68
>> 69 G4int G4SigmaMinusField::operator!=(const G4SigmaMinusField &) const
>> 70 {
>> 71 throw G4HadronicException(__FILE__, __LINE__, "G4SigmaMinusField::operator!= meant not to be accessible");
>> 72 return 1;
>> 73 }
>> 74
>> 75
>> 76
58 G4double G4SigmaMinusField::GetField(const G4T 77 G4double G4SigmaMinusField::GetField(const G4ThreeVector & aPosition)
59 { 78 {
60 // Field is 0 out of the nucleus! 79 // Field is 0 out of the nucleus!
61 if(aPosition.mag() >= radius) return 0.0; 80 if(aPosition.mag() >= radius) return 0.0;
62 81
63 G4double sigmaMinusMass = G4SigmaMinus::Sigm 82 G4double sigmaMinusMass = G4SigmaMinus::SigmaMinus()->GetPDGMass();
64 83
65 G4int A = theNucleus->GetMassNumber(); << 84 G4double A = theNucleus->GetMassNumber();
66 G4int Z = theNucleus->GetCharge(); << 85 G4double Z = theNucleus->GetCharge();
67 G4double bindingEnergy = G4NucleiProperties: << 86 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
68 G4double nucleusMass = Z*proton_mass_c2+(A-Z 87 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
69 G4double reducedMass = sigmaMinusMass*nucleu 88 G4double reducedMass = sigmaMinusMass*nucleusMass/(sigmaMinusMass+nucleusMass);
70 89
71 const G4VNuclearDensity * nuclearDensity=the 90 const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
72 G4double density = nuclearDensity->GetDensit 91 G4double density = nuclearDensity->GetDensity(aPosition);
73 92
74 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)* 93 return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density+GetBarrier();
75 } 94 }
76 95
>> 96
77 G4double G4SigmaMinusField::GetBarrier() 97 G4double G4SigmaMinusField::GetBarrier()
78 { 98 {
79 G4double A = theNucleus->GetMassNumber(); 99 G4double A = theNucleus->GetMassNumber();
80 G4double Z = theNucleus->GetCharge(); 100 G4double Z = theNucleus->GetCharge();
81 G4double coulombBarrier = (1.44/1.14) * MeV << 101 G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
82 return -coulombBarrier; 102 return -coulombBarrier;
83 } 103 }
84 104
85 105