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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" <<
48 #include "G4Log.hh" <<
49 #include "G4SystemOfUnits.hh" <<
50 #include "G4XnpElasticLowE.hh" 47 #include "G4XnpElasticLowE.hh"
51 #include "G4KineticTrack.hh" 48 #include "G4KineticTrack.hh"
52 #include "G4ParticleDefinition.hh" 49 #include "G4ParticleDefinition.hh"
53 #include "G4PhysicsVector.hh" 50 #include "G4PhysicsVector.hh"
54 #include "G4PhysicsLogVector.hh" << 51 #include "G4PhysicsLnVector.hh"
>> 52 #include "G4ParticleDefinition.hh"
55 #include "G4Proton.hh" 53 #include "G4Proton.hh"
56 #include "G4Neutron.hh" 54 #include "G4Neutron.hh"
57 55
58 const G4double G4XnpElasticLowE::_lowLimit = 0 56 const G4double G4XnpElasticLowE::_lowLimit = 0.;
59 const G4double G4XnpElasticLowE::_highLimit = 57 const G4double G4XnpElasticLowE::_highLimit = 3.*GeV;
60 58
61 // Low energy limit of the cross-section table 59 // Low energy limit of the cross-section table (in GeV)
62 // Units are assigned when filling the Physics << 60 // Units are assigned while filling the PhysicsVector
63 const G4double G4XnpElasticLowE::_eMinTable = 61 const G4double G4XnpElasticLowE::_eMinTable = 1.8964808;
64 const G4double G4XnpElasticLowE::_eStepLog = 0 62 const G4double G4XnpElasticLowE::_eStepLog = 0.01;
65 63
66 // Cross-sections in mb 64 // Cross-sections in mb
67 // Units are assigned when filling the Physics << 65 // Units are assigned while filling the PhysicsVector
68 const G4int G4XnpElasticLowE::_tableSize = 101 66 const G4int G4XnpElasticLowE::_tableSize = 101;
69 const G4double G4XnpElasticLowE::_sigmaTable[1 67 const G4double G4XnpElasticLowE::_sigmaTable[101] =
70 { 68 {
71 1500.0, //GF was 0.0 69 1500.0, //GF was 0.0
72 248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 3 70 248.20, 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 71 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 72 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 73 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 74 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 75 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 76 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 77 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 78 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 79 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. 80 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. 81 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 82 9.52, 9.49, 9.46, 9.43
85 }; 83 };
86 84
87 85
88 G4XnpElasticLowE::G4XnpElasticLowE() 86 G4XnpElasticLowE::G4XnpElasticLowE()
89 { 87 {
90 // Cross-sections are available in the range 88 // Cross-sections are available in the range (_eMin,_eMax)
91 89
92 _eMin = _eMinTable * GeV; 90 _eMin = _eMinTable * GeV;
93 _eMin = G4Exp(G4Log(_eMinTable)-_eStepLog)*G << 91 _eMin = std::exp(std::log(_eMinTable)-_eStepLog)*GeV;
94 _eMax = G4Exp(G4Log(_eMinTable) + _tableSize << 92 _eMax = std::exp(std::log(_eMinTable) + _tableSize * _eStepLog) * GeV;
95 93
96 // Protections: validity limits must be comp 94 // Protections: validity limits must be compatible with available data
97 95
98 if (_eMin < _lowLimit) 96 if (_eMin < _lowLimit)
99 throw G4HadronicException(__FILE__, __LINE 97 throw G4HadronicException(__FILE__, __LINE__, "G4XnpElasticLowE::G4XnpElasticLowE - Low energy limit not valid");
100 98
101 if (_highLimit > _eMax) 99 if (_highLimit > _eMax)
102 throw G4HadronicException(__FILE__, __LINE 100 throw G4HadronicException(__FILE__, __LINE__, "G4XnpElasticLowE::G4XnpElasticLowE - High energy limit not valid");
103 101
104 _sigma = new G4PhysicsLogVector(_eMin,_eMax, << 102 _sigma = new G4PhysicsLnVector(_eMin,_eMax,_tableSize);
105 G4int i; 103 G4int i;
106 for (i=0; i<_tableSize; i++) 104 for (i=0; i<_tableSize; i++)
107 { 105 {
108 G4double value = _sigmaTable[i] * millib 106 G4double value = _sigmaTable[i] * millibarn;
109 _sigma->PutValue(i,value); 107 _sigma->PutValue(i,value);
110 } 108 }
111 } 109 }
112 110
113 111
114 G4XnpElasticLowE::~G4XnpElasticLowE() 112 G4XnpElasticLowE::~G4XnpElasticLowE()
115 { 113 {
116 delete _sigma; << 114 delete _sigma;
117 _sigma = 0; <<
118 } 115 }
119 116
120 117
121 G4bool G4XnpElasticLowE::operator==(const G4Xn 118 G4bool G4XnpElasticLowE::operator==(const G4XnpElasticLowE &right) const
122 { 119 {
123 return (this == (G4XnpElasticLowE *) &right) 120 return (this == (G4XnpElasticLowE *) &right);
124 } 121 }
125 122
126 123
127 G4bool G4XnpElasticLowE::operator!=(const G4Xn 124 G4bool G4XnpElasticLowE::operator!=(const G4XnpElasticLowE &right) const
128 { 125 {
129 return (this != (G4XnpElasticLowE *) &right) 126 return (this != (G4XnpElasticLowE *) &right);
130 } 127 }
131 128
132 129
133 G4double G4XnpElasticLowE::CrossSection(const 130 G4double G4XnpElasticLowE::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
134 { 131 {
135 G4double sigma = 0.; 132 G4double sigma = 0.;
136 G4double sqrtS = (trk1.Get4Momentum() + trk2 133 G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
137 G4bool dummy = false; 134 G4bool dummy = false;
138 135
139 const G4ParticleDefinition* proton = G4Proto << 136 G4ParticleDefinition* proton = G4Proton::ProtonDefinition();
140 const G4ParticleDefinition* neutron = G4Neut << 137 G4ParticleDefinition* neutron = G4Neutron::NeutronDefinition();
141 138
142 const G4ParticleDefinition* def1 = trk1.GetD << 139 G4ParticleDefinition* def1 = trk1.GetDefinition();
143 const G4ParticleDefinition* def2 = trk2.GetD << 140 G4ParticleDefinition* def2 = trk2.GetDefinition();
144 if ( (def1 == proton && def2 == neutron) || 141 if ( (def1 == proton && def2 == neutron) ||
145 (def1 == neutron && def2 == proton) ) 142 (def1 == neutron && def2 == proton) )
146 { 143 {
147 if (sqrtS >= _eMin && sqrtS <= _eMax) 144 if (sqrtS >= _eMin && sqrtS <= _eMax)
148 { 145 {
149 sigma = _sigma->GetValue(sqrtS,dummy); 146 sigma = _sigma->GetValue(sqrtS,dummy);
150 } else if ( sqrtS < _eMin ) 147 } else if ( sqrtS < _eMin )
151 { 148 {
152 sigma = _sigma->GetValue(_eMin,dummy 149 sigma = _sigma->GetValue(_eMin,dummy);
153 } 150 }
154 } 151 }
155 152
156 return sigma; 153 return sigma;
157 } 154 }
158 155
159 void G4XnpElasticLowE::Print() const 156 void G4XnpElasticLowE::Print() const
160 { 157 {
161 // Dump the cross-section table 158 // Dump the cross-section table
162 G4cout << Name() << "Cross-section table: " 159 G4cout << Name() << "Cross-section table: " << G4endl;
163 G4bool dummy = false; 160 G4bool dummy = false;
164 G4int i; 161 G4int i;
165 162
166 for (i=0; i<_tableSize; i++) 163 for (i=0; i<_tableSize; i++)
167 { 164 {
168 G4double e = _sigma->GetLowEdgeEnergy(i) 165 G4double e = _sigma->GetLowEdgeEnergy(i) / GeV;
169 G4double sigma = _sigma->GetValue(e,dumm 166 G4double sigma = _sigma->GetValue(e,dummy) / millibarn;
170 G4cout << i << ") e = " << e << " GeV -- 167 G4cout << i << ") e = " << e << " GeV ---- Cross section = " << sigma << " mb " << G4endl;
171 } 168 }
172 169
173 G4VCrossSectionSource::Print(); 170 G4VCrossSectionSource::Print();
174 } 171 }
175 172
176 173
177 G4String G4XnpElasticLowE::Name() const 174 G4String G4XnpElasticLowE::Name() const
178 { 175 {
179 G4String name("npElasticLowE"); 176 G4String name("npElasticLowE");
180 return name; 177 return name;
181 } 178 }
182 179
183 180
184 G4bool G4XnpElasticLowE::IsValid(G4double e) c 181 G4bool G4XnpElasticLowE::IsValid(G4double e) const
185 { 182 {
186 G4bool answer = InLimits(e,_lowLimit,_highLi 183 G4bool answer = InLimits(e,_lowLimit,_highLimit);
187 184
188 return answer; 185 return answer;
189 } 186 }
190 187
191 188
192 189