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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" <<
49 #include "G4XAqmTotal.hh" 47 #include "G4XAqmTotal.hh"
50 #include "G4KineticTrack.hh" 48 #include "G4KineticTrack.hh"
51 #include "G4ParticleDefinition.hh" 49 #include "G4ParticleDefinition.hh"
52 50
53 51
54 // Validity range of this cross-section 52 // Validity range of this cross-section
55 const G4double G4XAqmTotal::_lowLimit = 0.; 53 const G4double G4XAqmTotal::_lowLimit = 0.;
56 const G4double G4XAqmTotal::_highLimit = DBL_M 54 const G4double G4XAqmTotal::_highLimit = DBL_MAX;
57 55
58 G4XAqmTotal::G4XAqmTotal() 56 G4XAqmTotal::G4XAqmTotal()
59 { 57 {
60 // As a first approximation the model is ass 58 // As a first approximation the model is assumed to be valid over
61 // the entire energy range 59 // the entire energy range
62 } 60 }
63 61
64 62
65 G4XAqmTotal::~G4XAqmTotal() 63 G4XAqmTotal::~G4XAqmTotal()
66 { } 64 { }
67 65
68 66
69 G4bool G4XAqmTotal::operator==(const G4XAqmTot 67 G4bool G4XAqmTotal::operator==(const G4XAqmTotal &right) const
70 { 68 {
71 return (this == (G4XAqmTotal *) &right); 69 return (this == (G4XAqmTotal *) &right);
72 } 70 }
73 71
74 72
75 G4bool G4XAqmTotal::operator!=(const G4XAqmTot 73 G4bool G4XAqmTotal::operator!=(const G4XAqmTotal &right) const
76 { 74 {
77 return (this != (G4XAqmTotal *) &right); 75 return (this != (G4XAqmTotal *) &right);
78 } 76 }
79 77
80 78
81 G4double G4XAqmTotal::CrossSection(const G4Kin 79 G4double G4XAqmTotal::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
82 { 80 {
83 G4double sigma = 0.; 81 G4double sigma = 0.;
84 82
85 // Get strangeness content 83 // Get strangeness content
86 const G4ParticleDefinition* def1 = trk1.GetD << 84 G4ParticleDefinition* def1 = trk1.GetDefinition();
87 G4int sTrk1 = def1->GetQuarkContent(3) + def 85 G4int sTrk1 = def1->GetQuarkContent(3) + def1->GetAntiQuarkContent(3);
88 const G4ParticleDefinition* def2 = trk2.GetD << 86 G4ParticleDefinition* def2 = trk2.GetDefinition();
89 G4int sTrk2 = def2->GetQuarkContent(3) + def 87 G4int sTrk2 = def2->GetQuarkContent(3) + def2->GetAntiQuarkContent(3);
90 88
91 // Get non-strange quark content 89 // Get non-strange quark content
92 G4int qTrk1 = def1->GetQuarkContent(1) + def 90 G4int qTrk1 = def1->GetQuarkContent(1) + def1->GetAntiQuarkContent(1) +
93 def1->GetQuarkContent(2) + def 91 def1->GetQuarkContent(2) + def1->GetAntiQuarkContent(2) +
94 def1->GetQuarkContent(4) + def 92 def1->GetQuarkContent(4) + def1->GetAntiQuarkContent(4) +
95 def1->GetQuarkContent(5) + def 93 def1->GetQuarkContent(5) + def1->GetAntiQuarkContent(5) +
96 def1->GetQuarkContent(6) + def 94 def1->GetQuarkContent(6) + def1->GetAntiQuarkContent(6);
97 95
98 G4int qTrk2 = def2->GetQuarkContent(1) + def 96 G4int qTrk2 = def2->GetQuarkContent(1) + def2->GetAntiQuarkContent(1) +
99 def2->GetQuarkContent(2) + def 97 def2->GetQuarkContent(2) + def2->GetAntiQuarkContent(2) +
100 def2->GetQuarkContent(4) + def 98 def2->GetQuarkContent(4) + def2->GetAntiQuarkContent(4) +
101 def2->GetQuarkContent(5) + def 99 def2->GetQuarkContent(5) + def2->GetAntiQuarkContent(5) +
102 def2->GetQuarkContent(6) + def 100 def2->GetQuarkContent(6) + def2->GetAntiQuarkContent(6);
103 101
104 G4double sRatio1 = 0.; 102 G4double sRatio1 = 0.;
105 if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1; 103 if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1;
106 104
107 G4double sRatio2 = 0.; 105 G4double sRatio2 = 0.;
108 if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2; 106 if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2;
109 107
110 // Calculate the number of colliding mesons 108 // Calculate the number of colliding mesons
111 G4int nMesons = 0; 109 G4int nMesons = 0;
112 G4int nQ1 = sTrk1 + qTrk1; 110 G4int nQ1 = sTrk1 + qTrk1;
113 111
114 if (nQ1 == 2) nMesons++; 112 if (nQ1 == 2) nMesons++;
115 G4int nQ2 = sTrk2 + qTrk2; 113 G4int nQ2 = sTrk2 + qTrk2;
116 if (nQ2 == 2) nMesons++; 114 if (nQ2 == 2) nMesons++;
117 115
118 // Cross-section (units to be checked!) 116 // Cross-section (units to be checked!)
119 sigma = 40. * G4Pow::GetInstance()->powN((2. << 117 sigma = 40. * std::pow((2.0/3.0),nMesons) * (1. - 0.4 * sRatio1) * (1. - 0.4 * sRatio2) * millibarn;
120 118
121 return sigma; 119 return sigma;
122 } 120 }
123 121
124 122
125 G4String G4XAqmTotal::Name() const 123 G4String G4XAqmTotal::Name() const
126 { 124 {
127 G4String name("AqmTotalCrossSection"); 125 G4String name("AqmTotalCrossSection");
128 return name; 126 return name;
129 } 127 }
130 128
131 129
132 130
133 G4bool G4XAqmTotal::IsValid(G4double e) const 131 G4bool G4XAqmTotal::IsValid(G4double e) const
134 { 132 {
135 G4bool answer = InLimits(e,_lowLimit,_highLi 133 G4bool answer = InLimits(e,_lowLimit,_highLimit);
136 134
137 return answer; 135 return answer;
138 } 136 }
139 137