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25 // 25 //
>> 26 // $Id$
>> 27 //
26 // ------------------------------------------- 28 // -------------------------------------------------------------------
27 // 29 //
28 // GEANT4 Class file 30 // GEANT4 Class file
29 // 31 //
30 // 32 //
31 // File name: G4NeutronElasticXS 33 // File name: G4NeutronElasticXS
32 // 34 //
33 // Author Ivantchenko, Geant4, 3-Aug-09 35 // Author Ivantchenko, Geant4, 3-Aug-09
34 // 36 //
35 // Modifications: 37 // Modifications:
36 // 38 //
37 39
>> 40 #include "G4HadronicException.hh"
38 #include "G4NeutronElasticXS.hh" 41 #include "G4NeutronElasticXS.hh"
39 #include "G4Neutron.hh" 42 #include "G4Neutron.hh"
40 #include "G4DynamicParticle.hh" 43 #include "G4DynamicParticle.hh"
41 #include "G4ElementTable.hh" <<
42 #include "G4Material.hh" <<
43 #include "G4Element.hh" 44 #include "G4Element.hh"
>> 45 #include "G4ElementTable.hh"
44 #include "G4PhysicsLogVector.hh" 46 #include "G4PhysicsLogVector.hh"
45 #include "G4CrossSectionDataSetRegistry.hh" << 47 #include "G4PhysicsVector.hh"
46 #include "G4ComponentGGHadronNucleusXsc.hh" << 48 #include "G4GlauberGribovCrossSection.hh"
47 #include "G4HadronicParameters.hh" << 49 #include "G4HadronNucleonXsc.hh"
48 #include "Randomize.hh" << 50 #include "G4NistManager.hh"
49 #include "G4SystemOfUnits.hh" << 51 #include "G4Proton.hh"
50 #include "G4IsotopeList.hh" <<
51 #include "G4AutoLock.hh" <<
52 52
>> 53 #include <iostream>
53 #include <fstream> 54 #include <fstream>
54 #include <sstream> 55 #include <sstream>
55 56
56 G4PhysicsVector* G4NeutronElasticXS::data[] = << 57 using namespace std;
57 G4double G4NeutronElasticXS::coeff[] = {0.0}; <<
58 G4String G4NeutronElasticXS::gDataDirectory = <<
59 G4bool G4NeutronElasticXS::fLock = true; <<
60 <<
61 namespace <<
62 { <<
63 G4Mutex nElasticXSMutex = G4MUTEX_INITIALIZE <<
64 } <<
65 58
66 G4NeutronElasticXS::G4NeutronElasticXS() 59 G4NeutronElasticXS::G4NeutronElasticXS()
67 : G4VCrossSectionDataSet(Default_Name()), << 60 : G4VCrossSectionDataSet("G4NeutronElasticXS"),
68 neutron(G4Neutron::Neutron()) << 61 proton(G4Proton::Proton()), maxZ(92)
69 { 62 {
70 // verboseLevel = 0; 63 // verboseLevel = 0;
71 if (verboseLevel > 0){ << 64 if(verboseLevel > 0){
72 G4cout << "G4NeutronElasticXS::G4NeutronE 65 G4cout << "G4NeutronElasticXS::G4NeutronElasticXS Initialise for Z < "
73 << MAXZEL << G4endl; << 66 << maxZ + 1 << G4endl;
74 } 67 }
75 ggXsection = << 68 data.resize(maxZ+1, 0);
76 G4CrossSectionDataSetRegistry::Instance()- << 69 coeff.resize(maxZ+1, 1.0);
77 if (ggXsection == nullptr) << 70 ggXsection = new G4GlauberGribovCrossSection();
78 ggXsection = new G4ComponentGGHadronNucleu << 71 fNucleon = new G4HadronNucleonXsc();
79 SetForAllAtomsAndEnergies(true); << 72 isInitialized = false;
80 FindDirectoryPath(); <<
81 } 73 }
82 74
83 G4NeutronElasticXS::~G4NeutronElasticXS() 75 G4NeutronElasticXS::~G4NeutronElasticXS()
84 { 76 {
85 if (isFirst) { << 77 delete fNucleon;
86 for(G4int i=0; i<MAXZEL; ++i) { << 78 for(G4int i=0; i<=maxZ; ++i) {
87 delete data[i]; << 79 delete data[i];
88 data[i] = nullptr; <<
89 } <<
90 } 80 }
91 } 81 }
92 82
93 void G4NeutronElasticXS::CrossSectionDescripti 83 void G4NeutronElasticXS::CrossSectionDescription(std::ostream& outFile) const
94 { 84 {
95 outFile << "G4NeutronElasticXS calculates th 85 outFile << "G4NeutronElasticXS calculates the neutron elastic scattering\n"
96 << "cross section on nuclei using da 86 << "cross section on nuclei using data from the high precision\n"
97 << "neutron database. These data ar 87 << "neutron database. These data are simplified and smoothed over\n"
98 << "the resonance region in order to 88 << "the resonance region in order to reduce CPU time.\n"
99 << "For high energies Glauber-Gribiv << 89 << "G4NeutronElasticXS is valid for energies up to 20 MeV, for all\n"
>> 90 << "targets through U.\n";
100 } 91 }
101 92
102 G4bool 93 G4bool
103 G4NeutronElasticXS::IsElementApplicable(const 94 G4NeutronElasticXS::IsElementApplicable(const G4DynamicParticle*,
104 G4int, const G4Material*) 95 G4int, const G4Material*)
105 { 96 {
106 return true; 97 return true;
107 } 98 }
108 99
109 G4bool G4NeutronElasticXS::IsIsoApplicable(con <<
110 G4i <<
111 con <<
112 { <<
113 return false; <<
114 } <<
115 <<
116 G4double 100 G4double
117 G4NeutronElasticXS::GetElementCrossSection(con 101 G4NeutronElasticXS::GetElementCrossSection(const G4DynamicParticle* aParticle,
118 G4int Z, const G4Material*) 102 G4int Z, const G4Material*)
119 { 103 {
120 return ElementCrossSection(aParticle->GetKin << 104 G4double xs = 0.0;
121 aParticle->GetLogKineticEnergy(), Z << 105 G4double ekin = aParticle->GetKineticEnergy();
122 } <<
123 <<
124 G4double <<
125 G4NeutronElasticXS::ComputeCrossSectionPerElem <<
126 const G4ParticleDefinition*, <<
127 const G4Element* elm, <<
128 const G4Material*) <<
129 { <<
130 return ElementCrossSection(ekin, loge, elm-> <<
131 } <<
132 106
133 G4double G4NeutronElasticXS::ElementCrossSecti << 107 if(Z < 1 || Z > maxZ) { return xs; }
134 { <<
135 G4int Z = (ZZ >= MAXZEL) ? MAXZEL - 1 : ZZ; <<
136 auto pv = GetPhysicsVector(Z); <<
137 108
138 G4double xs = (ekin <= pv->GetMaxEnergy()) ? << 109 G4int Amean = G4int(G4NistManager::Instance()->GetAtomicMassAmu(Z)+0.5);
139 : coeff[Z]*ggXsection->GetElasticElementCr << 110 G4PhysicsVector* pv = data[Z];
140 << 111 // G4cout << "G4NeutronElasticXS::GetCrossSection e= " << ekin << " Z= " << Z << G4endl;
141 << 112
142 #ifdef G4VERBOSE << 113 // element was not initialised
143 if(verboseLevel > 1) { << 114 if(!pv) {
144 G4cout << "Z= " << Z << " Ekin(MeV)= " << << 115 Initialise(Z);
145 << ", nElmXSel(b)= " << xs/CLHEP::barn << 116 pv = data[Z];
146 << G4endl; << 117 if(!pv) { return xs; }
>> 118 }
>> 119
>> 120 G4double e1 = pv->Energy(0);
>> 121 if(ekin <= e1) { return (*pv)[0]; }
>> 122
>> 123 G4int n = pv->GetVectorLength() - 1;
>> 124 G4double e2 = pv->Energy(n);
>> 125
>> 126 if(ekin <= e2) {
>> 127 xs = pv->Value(ekin);
>> 128 } else if(1 == Z) {
>> 129 fNucleon->GetHadronNucleonXscPDG(aParticle, proton);
>> 130 xs = coeff[1]*fNucleon->GetElasticHadronNucleonXsc();
>> 131 } else {
>> 132 ggXsection->GetIsoCrossSection(aParticle, Z, Amean);
>> 133 xs = coeff[Z]*ggXsection->GetElasticGlauberGribovXsc();
147 } 134 }
148 #endif <<
149 return xs; <<
150 } <<
151 135
152 G4double << 136 if(verboseLevel > 0){
153 G4NeutronElasticXS::ComputeIsoCrossSection(G4d << 137 G4cout << "ekin= " << ekin << ", XSinel= " << xs << G4endl;
154 const G4ParticleDefinition* <<
155 G4int Z, G4int A, <<
156 const G4Isotope*, const G4E <<
157 const G4Material*) <<
158 { <<
159 return ElementCrossSection(ekin, loge, Z)*A/ <<
160 } <<
161 <<
162 G4double <<
163 G4NeutronElasticXS::GetIsoCrossSection(const G <<
164 G4int Z, G4int A, <<
165 const G4Isotope*, const G4Eleme <<
166 const G4Material*) <<
167 { <<
168 return ElementCrossSection(aParticle->GetKin <<
169 aParticle->GetLogKineticEnergy(), Z <<
170 <<
171 } <<
172 <<
173 const G4Isotope* G4NeutronElasticXS::SelectIso <<
174 const G4Element* anElement, G4double, G4 <<
175 { <<
176 G4int nIso = (G4int)anElement->GetNumberOfIs <<
177 const G4Isotope* iso = anElement->GetIsotope <<
178 <<
179 //G4cout << "SelectIsotope NIso= " << nIso < <<
180 if(1 == nIso) { return iso; } <<
181 <<
182 const G4double* abundVector = anElement->Get <<
183 G4double q = G4UniformRand(); <<
184 G4double sum = 0.0; <<
185 <<
186 // isotope wise cross section not used <<
187 for (G4int j=0; j<nIso; ++j) { <<
188 sum += abundVector[j]; <<
189 if(q <= sum) { <<
190 iso = anElement->GetIsotope(j); <<
191 break; <<
192 } <<
193 } 138 }
194 return iso; << 139 return xs;
195 } 140 }
196 141
197 void 142 void
198 G4NeutronElasticXS::BuildPhysicsTable(const G4 143 G4NeutronElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
199 { 144 {
>> 145 if(isInitialized) { return; }
200 if(verboseLevel > 0){ 146 if(verboseLevel > 0){
201 G4cout << "G4NeutronElasticXS::BuildPhysic 147 G4cout << "G4NeutronElasticXS::BuildPhysicsTable for "
202 << p.GetParticleName() << G4endl; 148 << p.GetParticleName() << G4endl;
203 } 149 }
204 if(p.GetParticleName() != "neutron") { 150 if(p.GetParticleName() != "neutron") {
205 G4ExceptionDescription ed; << 151 throw G4HadronicException(__FILE__, __LINE__,"Wrong particle type");
206 ed << p.GetParticleName() << " is a wrong <<
207 << " only neutron is allowed"; <<
208 G4Exception("G4NeutronElasticXS::BuildPhys <<
209 FatalException, ed, ""); <<
210 return; 152 return;
211 } 153 }
212 if (fLock || isFirst) { << 154 isInitialized = true;
213 G4AutoLock l(&nElasticXSMutex); <<
214 if (fLock) { <<
215 isFirst = true; <<
216 fLock = false; <<
217 FindDirectoryPath(); <<
218 } <<
219 155
220 // Access to elements << 156 // check environment variable
221 const G4ElementTable* table = G4Element::G << 157 // Build the complete string identifying the file with the data set
222 for ( auto & elm : *table ) { << 158 char* path = getenv("G4NEUTRONXSDATA");
223 G4int Z = std::max( 1, std::min( elm->Ge << 159 if (!path){
224 if ( nullptr == data[Z] ) { Initialise(Z << 160 throw G4HadronicException(__FILE__, __LINE__,
225 } << 161 "G4NEUTRONXSDATA environment variable not defined");
226 l.unlock(); << 162 return;
227 } 163 }
228 } <<
229 164
230 const G4String& G4NeutronElasticXS::FindDirect << 165 G4DynamicParticle* dynParticle =
231 { << 166 new G4DynamicParticle(G4Neutron::Neutron(),G4ThreeVector(1,0,0),1);
232 // build the complete string identifying the << 167
233 if (gDataDirectory.empty()) { << 168 // Access to elements
234 std::ostringstream ost; << 169 const G4ElementTable* theElmTable = G4Element::GetElementTable();
235 ost << G4HadronicParameters::Instance()->G << 170 size_t numOfElm = G4Element::GetNumberOfElements();
236 gDataDirectory = ost.str(); << 171 if(numOfElm > 0) {
>> 172 for(size_t i=0; i<numOfElm; ++i) {
>> 173 G4int Z = G4int(((*theElmTable)[i])->GetZ());
>> 174 if(Z < 1) { Z = 1; }
>> 175 else if(Z > maxZ) { Z = maxZ; }
>> 176 //G4cout << "Z= " << Z << G4endl;
>> 177 // Initialisation
>> 178 if(!data[Z]) { Initialise(Z, dynParticle, path); }
>> 179 }
237 } 180 }
238 return gDataDirectory; << 181 delete dynParticle;
239 } 182 }
240 183
241 void G4NeutronElasticXS::InitialiseOnFly(G4int << 184 void
>> 185 G4NeutronElasticXS::Initialise(G4int Z, G4DynamicParticle* dp,
>> 186 const char* p)
242 { 187 {
243 G4AutoLock l(&nElasticXSMutex); << 188 if(data[Z]) { return; }
244 Initialise(Z); << 189 const char* path = p;
245 l.unlock(); << 190 if(!p) {
246 } << 191 // check environment variable
>> 192 // Build the complete string identifying the file with the data set
>> 193 path = getenv("G4NEUTRONXSDATA");
>> 194 if (!path) {
>> 195 throw G4HadronicException(__FILE__, __LINE__,
>> 196 "G4NEUTRONXSDATA environment variable not defined");
>> 197 return;
>> 198 }
>> 199 }
>> 200 G4DynamicParticle* dynParticle = dp;
>> 201 if(!dp) {
>> 202 dynParticle =
>> 203 new G4DynamicParticle(G4Neutron::Neutron(),G4ThreeVector(1,0,0),1);
>> 204 }
247 205
248 void G4NeutronElasticXS::Initialise(G4int Z) << 206 G4int Amean = G4int(G4NistManager::Instance()->GetAtomicMassAmu(Z)+0.5);
249 { <<
250 if(data[Z] != nullptr) { return; } <<
251 207
252 // upload data from file 208 // upload data from file
253 data[Z] = new G4PhysicsLogVector(); 209 data[Z] = new G4PhysicsLogVector();
254 210
255 std::ostringstream ost; 211 std::ostringstream ost;
256 ost << FindDirectoryPath() << Z ; << 212 ost << path << "/elast" << Z ;
257 std::ifstream filein(ost.str().c_str()); 213 std::ifstream filein(ost.str().c_str());
258 if (!filein.is_open()) { << 214 if (!(filein)) {
259 G4ExceptionDescription ed; << 215 G4cout << ost.str()
260 ed << "Data file <" << ost.str().c_str() << 216 << " is not opened by G4NeutronElasticXS" << G4endl;
261 << "> is not opened!"; << 217 throw G4HadronicException(__FILE__, __LINE__,"NO data sets opened");
262 G4Exception("G4NeutronElasticXS::Initialis <<
263 FatalException, ed, "Check G4P <<
264 return; 218 return;
265 } << 219 }else{
266 if(verboseLevel > 1) { << 220 if(verboseLevel > 1) {
267 G4cout << "file " << ost.str() << 221 G4cout << "file " << ost.str()
268 << " is opened by G4NeutronElasticXS" << << 222 << " is opened by G4NeutronElasticXS" << G4endl;
269 } << 223 }
270 224
271 // retrieve data from DB << 225 // retrieve data from DB
272 if(!data[Z]->Retrieve(filein, true)) { << 226 data[Z]->Retrieve(filein, true);
273 G4ExceptionDescription ed; << 227
274 ed << "Data file <" << ost.str().c_str() << 228 // smooth transition
275 << "> is not retrieved!"; << 229 size_t n = data[Z]->GetVectorLength() - 1;
276 G4Exception("G4NeutronElasticXS::Initialis << 230 G4double emax = data[Z]->Energy(n);
277 FatalException, ed, "Check G4PARTICLEXSDAT << 231 G4double sig1 = (*data[Z])[n];
278 return; << 232 dynParticle->SetKineticEnergy(emax);
279 } << 233 G4double sig2 = 0.0;
280 // smooth transition << 234 if(1 == Z) {
281 G4double sig1 = (*(data[Z]))[data[Z]->GetVe << 235 fNucleon->GetHadronNucleonXscPDG(dynParticle, proton);
282 G4double ehigh = data[Z]->GetMaxEnergy(); << 236 sig2 = fNucleon->GetElasticHadronNucleonXsc();
283 G4double sig2 = ggXsection->GetElasticEleme << 237 } else {
284 ehigh, Z, aeff[ << 238 ggXsection->GetIsoCrossSection(dynParticle, Z, Amean);
285 coeff[Z] = (sig2 > 0.) ? sig1/sig2 : 1.0; << 239 sig2 = ggXsection->GetElasticGlauberGribovXsc();
>> 240 }
>> 241 if(sig2 > 0.) { coeff[Z] = sig1/sig2; }
>> 242 }
>> 243 if(!dp) { delete dynParticle; }
286 } 244 }
287 245