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27 // -------------------------------------------
28 // GEANT4 Class file
29 //
30 // For information related to this code c
31 //
32 // File name: G4XnpTotalLowE
33 //
34 // Author:
35 //
36 // Creation date: 15 April 1999
37 //
38 // Modifications:
39 //
40 // Neutron-Proton total cross section
41 // Linear interpolation from data table
42 //
43 // -------------------------------------------
44
45 #include "globals.hh"
46 #include "G4ios.hh"
47 #include "G4Exp.hh"
48 #include "G4Log.hh"
49 #include "G4SystemOfUnits.hh"
50 #include "G4XnpTotalLowE.hh"
51 #include "G4KineticTrack.hh"
52 #include "G4ParticleDefinition.hh"
53 #include "G4PhysicsVector.hh"
54 #include "G4PhysicsLogVector.hh"
55 #include "G4Proton.hh"
56 #include "G4Neutron.hh"
57
58 const G4double G4XnpTotalLowE::_lowLimit = 0.;
59 const G4double G4XnpTotalLowE::_highLimit = 3.
60
61 // Low energy limit of the cross-section table
62 // Units are assigned when filling the Physics
63 const G4double G4XnpTotalLowE::_eMinTable = 1.
64 const G4double G4XnpTotalLowE::_eStepLog = 0.0
65
66 // Cross-sections in mb
67 // Units are assigned when filling the Physics
68 const G4int G4XnpTotalLowE::_tableSize = 101;
69 const G4double G4XnpTotalLowE::_sigmaTable[101
70 {
71 1500.0,
72 248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 3
73 35.02, 34.47, 34.37, 34.67, 35.23, 35.97, 36
74 37.77, 38.03, 38.40, 38.83, 39.26, 39.67, 40
75 40.79, 41.06, 41.31, 41.52, 41.70, 41.81, 41
76 42.12, 42.29, 42.55, 42.82, 43.01, 43.12, 43
77 43.06, 42.95, 42.81, 42.67, 42.54, 42.45, 42
78 42.30, 42.29, 42.28, 42.26, 42.24, 42.21, 42
79 42.10, 42.07, 42.06, 42.05, 42.04, 42.03, 42
80 41.97, 41.94, 41.89, 41.84, 41.79, 41.73, 41
81 41.55, 41.49, 41.44, 41.38, 41.34, 41.31, 41
82 41.27, 41.28, 41.30, 41.33, 41.36, 41.40, 41
83 41.50, 41.51, 41.51, 41.51, 41.52, 41.51, 41
84 41.50, 41.49, 41.47, 41.46
85 };
86
87
88 G4XnpTotalLowE::G4XnpTotalLowE()
89 {
90 // Cross-sections are available in the range
91
92 _eMin = _eMinTable * GeV;
93 _eMin = G4Exp(G4Log(_eMinTable)-_eStepLog)*G
94 _eMax = G4Exp(G4Log(_eMinTable) + _tableSize
95
96 // Protections: validity limits must be comp
97 // @@GF this ought to be _lowLimit < _eMin
98 if (_eMin < _lowLimit)
99 throw G4HadronicException(__FILE__, __LINE
100
101 if (_highLimit > _eMax)
102 throw G4HadronicException(__FILE__, __LINE
103
104 _sigma = new G4PhysicsLogVector(_eMin,_eMax,
105 G4int i;
106 for (i=0; i<_tableSize; i++)
107 {
108 G4double value = _sigmaTable[i] * millib
109 _sigma->PutValue(i,value);
110 }
111 }
112
113
114 G4XnpTotalLowE::~G4XnpTotalLowE()
115 {
116 if (_sigma) delete _sigma;
117 _sigma=0;
118 }
119
120
121 G4bool G4XnpTotalLowE::operator==(const G4XnpT
122 {
123 return (this == (G4XnpTotalLowE *) &right);
124 }
125
126
127 G4bool G4XnpTotalLowE::operator!=(const G4XnpT
128 {
129 return (this != (G4XnpTotalLowE *) &right);
130 }
131
132
133 G4double G4XnpTotalLowE::CrossSection(const G4
134 {
135 G4double sigma = 0.;
136 G4double sqrtS = (trk1.Get4Momentum() + trk2
137 G4bool dummy = false;
138
139 const G4ParticleDefinition* proton = G4Proto
140 const G4ParticleDefinition* neutron = G4Neut
141
142 const G4ParticleDefinition* def1 = trk1.GetD
143 const G4ParticleDefinition* def2 = trk2.GetD
144 if ( (def1 == proton && def2 == neutron) ||
145 (def1 == neutron && def2 == proton) )
146 {
147 if (sqrtS >= _eMin && sqrtS <= _eMax)
148 {
149 sigma = _sigma->GetValue(sqrtS,dummy);
150 } else if ( sqrtS < _eMin )
151 {
152 sigma = _sigma->GetValue(_eMin,dummy
153 }
154 }
155
156 return sigma;
157 }
158
159 void G4XnpTotalLowE::Print() const
160 {
161 // Dump the cross-section table
162
163 G4cout << Name() << "Cross-section table: "
164 G4bool dummy = false;
165 G4int i;
166
167 for (i=0; i<_tableSize; i++)
168 {
169 G4double e = _sigma->GetLowEdgeEnergy(i)
170 G4double sigma = _sigma->GetValue(e,dumm
171 G4cout << i << ") e = " << e << " GeV --
172 }
173
174 G4VCrossSectionSource::Print();
175 }
176
177
178 G4String G4XnpTotalLowE::Name() const
179 {
180 G4String name("NNTotalLowE");
181 return name;
182 }
183
184
185 G4bool G4XnpTotalLowE::IsValid(G4double e) con
186 {
187 G4bool answer = InLimits(e,_lowLimit,_highLi
188
189 return answer;
190 }
191
192
193