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25 // 25 //
26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // GEANT4 Class file 28 // GEANT4 Class file
29 // 29 //
30 // For information related to this code c 30 // For information related to this code contact:
31 // 31 //
32 // File name: G4XAqmTotal 32 // File name: G4XAqmTotal
33 // 33 //
34 // Author: 34 // Author:
35 // 35 //
36 // Creation date: 15 April 1999 36 // Creation date: 15 April 1999
37 // 37 //
38 // Modifications: 38 // Modifications:
39 // 39 //
40 // Additive Quark Model total cross section 40 // Additive Quark Model total cross section
41 // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1 41 // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71
42 // 42 //
43 // ------------------------------------------- 43 // -------------------------------------------------------------------
44 44
45 #include "globals.hh" 45 #include "globals.hh"
46 #include "G4ios.hh" 46 #include "G4ios.hh"
47 #include "G4Pow.hh" <<
48 #include "G4SystemOfUnits.hh" 47 #include "G4SystemOfUnits.hh"
49 #include "G4XAqmTotal.hh" 48 #include "G4XAqmTotal.hh"
50 #include "G4KineticTrack.hh" 49 #include "G4KineticTrack.hh"
51 #include "G4ParticleDefinition.hh" 50 #include "G4ParticleDefinition.hh"
52 51
53 52
54 // Validity range of this cross-section 53 // Validity range of this cross-section
55 const G4double G4XAqmTotal::_lowLimit = 0.; 54 const G4double G4XAqmTotal::_lowLimit = 0.;
56 const G4double G4XAqmTotal::_highLimit = DBL_M 55 const G4double G4XAqmTotal::_highLimit = DBL_MAX;
57 56
58 G4XAqmTotal::G4XAqmTotal() 57 G4XAqmTotal::G4XAqmTotal()
59 { 58 {
60 // As a first approximation the model is ass 59 // As a first approximation the model is assumed to be valid over
61 // the entire energy range 60 // the entire energy range
62 } 61 }
63 62
64 63
65 G4XAqmTotal::~G4XAqmTotal() 64 G4XAqmTotal::~G4XAqmTotal()
66 { } 65 { }
67 66
68 67
69 G4bool G4XAqmTotal::operator==(const G4XAqmTot 68 G4bool G4XAqmTotal::operator==(const G4XAqmTotal &right) const
70 { 69 {
71 return (this == (G4XAqmTotal *) &right); 70 return (this == (G4XAqmTotal *) &right);
72 } 71 }
73 72
74 73
75 G4bool G4XAqmTotal::operator!=(const G4XAqmTot 74 G4bool G4XAqmTotal::operator!=(const G4XAqmTotal &right) const
76 { 75 {
77 return (this != (G4XAqmTotal *) &right); 76 return (this != (G4XAqmTotal *) &right);
78 } 77 }
79 78
80 79
81 G4double G4XAqmTotal::CrossSection(const G4Kin 80 G4double G4XAqmTotal::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
82 { 81 {
83 G4double sigma = 0.; 82 G4double sigma = 0.;
84 83
85 // Get strangeness content 84 // Get strangeness content
86 const G4ParticleDefinition* def1 = trk1.GetD 85 const G4ParticleDefinition* def1 = trk1.GetDefinition();
87 G4int sTrk1 = def1->GetQuarkContent(3) + def 86 G4int sTrk1 = def1->GetQuarkContent(3) + def1->GetAntiQuarkContent(3);
88 const G4ParticleDefinition* def2 = trk2.GetD 87 const G4ParticleDefinition* def2 = trk2.GetDefinition();
89 G4int sTrk2 = def2->GetQuarkContent(3) + def 88 G4int sTrk2 = def2->GetQuarkContent(3) + def2->GetAntiQuarkContent(3);
90 89
91 // Get non-strange quark content 90 // Get non-strange quark content
92 G4int qTrk1 = def1->GetQuarkContent(1) + def 91 G4int qTrk1 = def1->GetQuarkContent(1) + def1->GetAntiQuarkContent(1) +
93 def1->GetQuarkContent(2) + def 92 def1->GetQuarkContent(2) + def1->GetAntiQuarkContent(2) +
94 def1->GetQuarkContent(4) + def 93 def1->GetQuarkContent(4) + def1->GetAntiQuarkContent(4) +
95 def1->GetQuarkContent(5) + def 94 def1->GetQuarkContent(5) + def1->GetAntiQuarkContent(5) +
96 def1->GetQuarkContent(6) + def 95 def1->GetQuarkContent(6) + def1->GetAntiQuarkContent(6);
97 96
98 G4int qTrk2 = def2->GetQuarkContent(1) + def 97 G4int qTrk2 = def2->GetQuarkContent(1) + def2->GetAntiQuarkContent(1) +
99 def2->GetQuarkContent(2) + def 98 def2->GetQuarkContent(2) + def2->GetAntiQuarkContent(2) +
100 def2->GetQuarkContent(4) + def 99 def2->GetQuarkContent(4) + def2->GetAntiQuarkContent(4) +
101 def2->GetQuarkContent(5) + def 100 def2->GetQuarkContent(5) + def2->GetAntiQuarkContent(5) +
102 def2->GetQuarkContent(6) + def 101 def2->GetQuarkContent(6) + def2->GetAntiQuarkContent(6);
103 102
104 G4double sRatio1 = 0.; 103 G4double sRatio1 = 0.;
105 if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1; 104 if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1;
106 105
107 G4double sRatio2 = 0.; 106 G4double sRatio2 = 0.;
108 if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2; 107 if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2;
109 108
110 // Calculate the number of colliding mesons 109 // Calculate the number of colliding mesons
111 G4int nMesons = 0; 110 G4int nMesons = 0;
112 G4int nQ1 = sTrk1 + qTrk1; 111 G4int nQ1 = sTrk1 + qTrk1;
113 112
114 if (nQ1 == 2) nMesons++; 113 if (nQ1 == 2) nMesons++;
115 G4int nQ2 = sTrk2 + qTrk2; 114 G4int nQ2 = sTrk2 + qTrk2;
116 if (nQ2 == 2) nMesons++; 115 if (nQ2 == 2) nMesons++;
117 116
118 // Cross-section (units to be checked!) 117 // Cross-section (units to be checked!)
119 sigma = 40. * G4Pow::GetInstance()->powN((2. << 118 sigma = 40. * std::pow((2.0/3.0),nMesons) * (1. - 0.4 * sRatio1) * (1. - 0.4 * sRatio2) * millibarn;
120 119
121 return sigma; 120 return sigma;
122 } 121 }
123 122
124 123
125 G4String G4XAqmTotal::Name() const 124 G4String G4XAqmTotal::Name() const
126 { 125 {
127 G4String name("AqmTotalCrossSection"); 126 G4String name("AqmTotalCrossSection");
128 return name; 127 return name;
129 } 128 }
130 129
131 130
132 131
133 G4bool G4XAqmTotal::IsValid(G4double e) const 132 G4bool G4XAqmTotal::IsValid(G4double e) const
134 { 133 {
135 G4bool answer = InLimits(e,_lowLimit,_highLi 134 G4bool answer = InLimits(e,_lowLimit,_highLimit);
136 135
137 return answer; 136 return answer;
138 } 137 }
139 138