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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 <<
39 #include "G4PionMinusField.hh" 38 #include "G4PionMinusField.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 "G4PionMinus.hh" 42 #include "G4PionMinus.hh"
46 #include "G4HadTmpUtil.hh" 43 #include "G4HadTmpUtil.hh"
47 #include "G4Pow.hh" <<
48 44
49 G4PionMinusField::G4PionMinusField(G4V3DNucleu 45 G4PionMinusField::G4PionMinusField(G4V3DNucleus * nucleus, G4double coeff)
50 : G4VNuclearField(nucleus) 46 : G4VNuclearField(nucleus)
51 { 47 {
52 theCoeff = coeff; 48 theCoeff = coeff;
53 } 49 }
54 50
55 51
56 G4PionMinusField::~G4PionMinusField() 52 G4PionMinusField::~G4PionMinusField()
57 { } 53 { }
58 54
>> 55
>> 56 const G4PionMinusField & G4PionMinusField::operator=(const G4PionMinusField &)
>> 57 {
>> 58 throw G4HadronicException(__FILE__, __LINE__, "G4PionMinusField::operator= meant not to be accessible");
>> 59 return *this;
>> 60 }
>> 61
>> 62
>> 63 G4int G4PionMinusField::operator==(const G4PionMinusField &) const
>> 64 {
>> 65 throw G4HadronicException(__FILE__, __LINE__, "G4PionMinusField::operator== meant not to be accessible");
>> 66 return 0;
>> 67 }
>> 68
>> 69
>> 70 G4int G4PionMinusField::operator!=(const G4PionMinusField &) const
>> 71 {
>> 72 throw G4HadronicException(__FILE__, __LINE__, "G4PionMinusField::operator!= meant not to be accessible");
>> 73 return 1;
>> 74 }
>> 75
>> 76
59 G4double G4PionMinusField::GetField(const G4Th 77 G4double G4PionMinusField::GetField(const G4ThreeVector & aPosition)
60 { 78 {
61 // Field is 0 out of the nucleus! 79 // Field is 0 out of the nucleus!
62 if(aPosition.mag() >= radius) return 0.0; 80 if(aPosition.mag() >= radius) return 0.0;
63 81
64 G4int A = theNucleus->GetMassNumber(); 82 G4int A = theNucleus->GetMassNumber();
65 G4int Z = theNucleus->GetCharge(); 83 G4int Z = theNucleus->GetCharge();
66 G4double pionMinusMass = G4PionMinus::PionMi 84 G4double pionMinusMass = G4PionMinus::PionMinus()->GetPDGMass();
67 G4double bindingEnergy = G4NucleiProperties: 85 G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
68 G4double nucleusMass = Z*proton_mass_c2+(A-Z 86 G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
69 G4double reducedMass = pionMinusMass*nucleus 87 G4double reducedMass = pionMinusMass*nucleusMass/(pionMinusMass+nucleusMass);
70 88
71 G4double density = A*theNucleus->GetNuclearD 89 G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition);
72 G4double nucleonMass = (proton_mass_c2+neutr 90 G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
73 91
74 return 2.*pi*hbarc*hbarc/reducedMass*(1+pion 92 return 2.*pi*hbarc*hbarc/reducedMass*(1+pionMinusMass/nucleonMass)*theCoeff*density + GetBarrier();
75 } 93 }
76 94
77 95
78 G4double G4PionMinusField::GetBarrier() 96 G4double G4PionMinusField::GetBarrier()
79 { 97 {
80 G4int A = theNucleus->GetMassNumber(); 98 G4int A = theNucleus->GetMassNumber();
81 G4int Z = theNucleus->GetCharge(); 99 G4int Z = theNucleus->GetCharge();
82 G4double coulombBarrier = (1.44/1.14) * MeV << 100 G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
83 return -coulombBarrier; 101 return -coulombBarrier;
84 } 102 }
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