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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: G4XnpElasticLowE 32 // File name: G4XnpElasticLowE
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 // Neutron-Proton elastic cross section 40 // Neutron-Proton elastic cross section
41 // Linear interpolation from data table 41 // Linear interpolation from data table
42 // 42 //
43 // ------------------------------------------- 43 // -------------------------------------------------------------------
44 44
45 #include "globals.hh" 45 #include "globals.hh"
46 #include "G4ios.hh" 46 #include "G4ios.hh"
47 #include "G4Exp.hh" 47 #include "G4Exp.hh"
48 #include "G4Log.hh" 48 #include "G4Log.hh"
49 #include "G4SystemOfUnits.hh" 49 #include "G4SystemOfUnits.hh"
50 #include "G4XnpElasticLowE.hh" 50 #include "G4XnpElasticLowE.hh"
51 #include "G4KineticTrack.hh" 51 #include "G4KineticTrack.hh"
52 #include "G4ParticleDefinition.hh" 52 #include "G4ParticleDefinition.hh"
53 #include "G4PhysicsVector.hh" 53 #include "G4PhysicsVector.hh"
54 #include "G4PhysicsLogVector.hh" 54 #include "G4PhysicsLogVector.hh"
55 #include "G4Proton.hh" 55 #include "G4Proton.hh"
56 #include "G4Neutron.hh" 56 #include "G4Neutron.hh"
57 57
58 const G4double G4XnpElasticLowE::_lowLimit = 0 58 const G4double G4XnpElasticLowE::_lowLimit = 0.;
59 const G4double G4XnpElasticLowE::_highLimit = 59 const G4double G4XnpElasticLowE::_highLimit = 3.*GeV;
60 60
61 // Low energy limit of the cross-section table 61 // Low energy limit of the cross-section table (in GeV)
62 // Units are assigned when filling the Physics 62 // Units are assigned when filling the PhysicsVector
63 const G4double G4XnpElasticLowE::_eMinTable = 63 const G4double G4XnpElasticLowE::_eMinTable = 1.8964808;
64 const G4double G4XnpElasticLowE::_eStepLog = 0 64 const G4double G4XnpElasticLowE::_eStepLog = 0.01;
65 65
66 // Cross-sections in mb 66 // Cross-sections in mb
67 // Units are assigned when filling the Physics 67 // Units are assigned when filling the PhysicsVector
68 const G4int G4XnpElasticLowE::_tableSize = 101 68 const G4int G4XnpElasticLowE::_tableSize = 101;
69 const G4double G4XnpElasticLowE::_sigmaTable[1 69 const G4double G4XnpElasticLowE::_sigmaTable[101] =
70 { 70 {
71 1500.0, //GF was 0.0 71 1500.0, //GF was 0.0
72 248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 3 72 248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 37.20, 35.98,
73 35.02, 34.47, 32.48, 30.76, 29.46, 28.53, 27 73 35.02, 34.47, 32.48, 30.76, 29.46, 28.53, 27.84, 27.20,
74 26.53, 25.95, 25.59, 25.46, 25.00, 24.49, 24 74 26.53, 25.95, 25.59, 25.46, 25.00, 24.49, 24.08, 23.86,
75 23.17, 22.70, 21.88, 21.48, 20.22, 19.75, 18 75 23.17, 22.70, 21.88, 21.48, 20.22, 19.75, 18.97, 18.39,
76 17.98, 17.63, 17.21, 16.72, 16.68, 16.58, 16 76 17.98, 17.63, 17.21, 16.72, 16.68, 16.58, 16.42, 16.22,
77 15.98, 15.71, 15.42, 15.14, 14.87, 14.65, 14 77 15.98, 15.71, 15.42, 15.14, 14.87, 14.65, 14.44, 14.26,
78 14.10, 13.95, 13.80, 13.64, 13.47, 13.29, 13 78 14.10, 13.95, 13.80, 13.64, 13.47, 13.29, 13.09, 12.89,
79 12.68, 12.47, 12.27, 12.06, 11.84, 11.76, 11 79 12.68, 12.47, 12.27, 12.06, 11.84, 11.76, 11.69, 11.60,
80 11.50, 11.41, 11.29, 11.17, 11.06, 10.93, 10 80 11.50, 11.41, 11.29, 11.17, 11.06, 10.93, 10.81, 10.68,
81 10.56, 10.44, 10.33, 10.21, 10.12, 10.03, 9 81 10.56, 10.44, 10.33, 10.21, 10.12, 10.03, 9.96, 9.89,
82 9.83, 9.80, 9.77, 9.75, 9.74, 9.74, 9. 82 9.83, 9.80, 9.77, 9.75, 9.74, 9.74, 9.74, 9.76,
83 9.73, 9.70, 9.68, 9.65, 9.63, 9.60, 9. 83 9.73, 9.70, 9.68, 9.65, 9.63, 9.60, 9.57, 9.55,
84 9.52, 9.49, 9.46, 9.43 84 9.52, 9.49, 9.46, 9.43
85 }; 85 };
86 86
87 87
88 G4XnpElasticLowE::G4XnpElasticLowE() 88 G4XnpElasticLowE::G4XnpElasticLowE()
89 { 89 {
90 // Cross-sections are available in the range 90 // Cross-sections are available in the range (_eMin,_eMax)
91 91
92 _eMin = _eMinTable * GeV; 92 _eMin = _eMinTable * GeV;
93 _eMin = G4Exp(G4Log(_eMinTable)-_eStepLog)*G 93 _eMin = G4Exp(G4Log(_eMinTable)-_eStepLog)*GeV;
94 _eMax = G4Exp(G4Log(_eMinTable) + _tableSize 94 _eMax = G4Exp(G4Log(_eMinTable) + _tableSize * _eStepLog) * GeV;
95 95
96 // Protections: validity limits must be comp 96 // Protections: validity limits must be compatible with available data
97 97
98 if (_eMin < _lowLimit) 98 if (_eMin < _lowLimit)
99 throw G4HadronicException(__FILE__, __LINE 99 throw G4HadronicException(__FILE__, __LINE__, "G4XnpElasticLowE::G4XnpElasticLowE - Low energy limit not valid");
100 100
101 if (_highLimit > _eMax) 101 if (_highLimit > _eMax)
102 throw G4HadronicException(__FILE__, __LINE 102 throw G4HadronicException(__FILE__, __LINE__, "G4XnpElasticLowE::G4XnpElasticLowE - High energy limit not valid");
103 103
104 _sigma = new G4PhysicsLogVector(_eMin,_eMax, 104 _sigma = new G4PhysicsLogVector(_eMin,_eMax,_tableSize);
105 G4int i; 105 G4int i;
106 for (i=0; i<_tableSize; i++) 106 for (i=0; i<_tableSize; i++)
107 { 107 {
108 G4double value = _sigmaTable[i] * millib 108 G4double value = _sigmaTable[i] * millibarn;
109 _sigma->PutValue(i,value); 109 _sigma->PutValue(i,value);
110 } 110 }
111 } 111 }
112 112
113 113
114 G4XnpElasticLowE::~G4XnpElasticLowE() 114 G4XnpElasticLowE::~G4XnpElasticLowE()
115 { 115 {
116 delete _sigma; 116 delete _sigma;
117 _sigma = 0; 117 _sigma = 0;
118 } 118 }
119 119
120 120
121 G4bool G4XnpElasticLowE::operator==(const G4Xn 121 G4bool G4XnpElasticLowE::operator==(const G4XnpElasticLowE &right) const
122 { 122 {
123 return (this == (G4XnpElasticLowE *) &right) 123 return (this == (G4XnpElasticLowE *) &right);
124 } 124 }
125 125
126 126
127 G4bool G4XnpElasticLowE::operator!=(const G4Xn 127 G4bool G4XnpElasticLowE::operator!=(const G4XnpElasticLowE &right) const
128 { 128 {
129 return (this != (G4XnpElasticLowE *) &right) 129 return (this != (G4XnpElasticLowE *) &right);
130 } 130 }
131 131
132 132
133 G4double G4XnpElasticLowE::CrossSection(const 133 G4double G4XnpElasticLowE::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
134 { 134 {
135 G4double sigma = 0.; 135 G4double sigma = 0.;
136 G4double sqrtS = (trk1.Get4Momentum() + trk2 136 G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
137 G4bool dummy = false; 137 G4bool dummy = false;
138 138
139 const G4ParticleDefinition* proton = G4Proto 139 const G4ParticleDefinition* proton = G4Proton::ProtonDefinition();
140 const G4ParticleDefinition* neutron = G4Neut 140 const G4ParticleDefinition* neutron = G4Neutron::NeutronDefinition();
141 141
142 const G4ParticleDefinition* def1 = trk1.GetD 142 const G4ParticleDefinition* def1 = trk1.GetDefinition();
143 const G4ParticleDefinition* def2 = trk2.GetD 143 const G4ParticleDefinition* def2 = trk2.GetDefinition();
144 if ( (def1 == proton && def2 == neutron) || 144 if ( (def1 == proton && def2 == neutron) ||
145 (def1 == neutron && def2 == proton) ) 145 (def1 == neutron && def2 == proton) )
146 { 146 {
147 if (sqrtS >= _eMin && sqrtS <= _eMax) 147 if (sqrtS >= _eMin && sqrtS <= _eMax)
148 { 148 {
149 sigma = _sigma->GetValue(sqrtS,dummy); 149 sigma = _sigma->GetValue(sqrtS,dummy);
150 } else if ( sqrtS < _eMin ) 150 } else if ( sqrtS < _eMin )
151 { 151 {
152 sigma = _sigma->GetValue(_eMin,dummy 152 sigma = _sigma->GetValue(_eMin,dummy);
153 } 153 }
154 } 154 }
155 155
156 return sigma; 156 return sigma;
157 } 157 }
158 158
159 void G4XnpElasticLowE::Print() const 159 void G4XnpElasticLowE::Print() const
160 { 160 {
161 // Dump the cross-section table 161 // Dump the cross-section table
162 G4cout << Name() << "Cross-section table: " 162 G4cout << Name() << "Cross-section table: " << G4endl;
163 G4bool dummy = false; 163 G4bool dummy = false;
164 G4int i; 164 G4int i;
165 165
166 for (i=0; i<_tableSize; i++) 166 for (i=0; i<_tableSize; i++)
167 { 167 {
168 G4double e = _sigma->GetLowEdgeEnergy(i) 168 G4double e = _sigma->GetLowEdgeEnergy(i) / GeV;
169 G4double sigma = _sigma->GetValue(e,dumm 169 G4double sigma = _sigma->GetValue(e,dummy) / millibarn;
170 G4cout << i << ") e = " << e << " GeV -- 170 G4cout << i << ") e = " << e << " GeV ---- Cross section = " << sigma << " mb " << G4endl;
171 } 171 }
172 172
173 G4VCrossSectionSource::Print(); 173 G4VCrossSectionSource::Print();
174 } 174 }
175 175
176 176
177 G4String G4XnpElasticLowE::Name() const 177 G4String G4XnpElasticLowE::Name() const
178 { 178 {
179 G4String name("npElasticLowE"); 179 G4String name("npElasticLowE");
180 return name; 180 return name;
181 } 181 }
182 182
183 183
184 G4bool G4XnpElasticLowE::IsValid(G4double e) c 184 G4bool G4XnpElasticLowE::IsValid(G4double e) const
185 { 185 {
186 G4bool answer = InLimits(e,_lowLimit,_highLi 186 G4bool answer = InLimits(e,_lowLimit,_highLimit);
187 187
188 return answer; 188 return answer;
189 } 189 }
190 190
191 191
192 192