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25 // 25 //
>> 26 //
26 // ------------------------------------------- 27 // -------------------------------------------------------------------
27 // 28 //
28 // GEANT4 Class file 29 // GEANT4 Class file
29 // 30 //
30 // 31 //
31 // File name: G4BGGPionInelasticXS 32 // File name: G4BGGPionInelasticXS
32 // 33 //
33 // Author: Vladimir Ivanchenko 34 // Author: Vladimir Ivanchenko
34 // 35 //
35 // Creation date: 01.10.2003 36 // Creation date: 01.10.2003
36 // Modifications: 37 // Modifications:
37 // 38 //
38 // ------------------------------------------- 39 // -------------------------------------------------------------------
39 // 40 //
40 41
41 #include "G4BGGPionInelasticXS.hh" 42 #include "G4BGGPionInelasticXS.hh"
42 #include "G4SystemOfUnits.hh" 43 #include "G4SystemOfUnits.hh"
43 #include "G4ComponentGGHadronNucleusXsc.hh" 44 #include "G4ComponentGGHadronNucleusXsc.hh"
44 #include "G4UPiNuclearCrossSection.hh" 45 #include "G4UPiNuclearCrossSection.hh"
45 #include "G4HadronNucleonXsc.hh" 46 #include "G4HadronNucleonXsc.hh"
46 #include "G4NuclearRadii.hh" << 47 #include "G4ComponentSAIDTotalXS.hh"
47 48
48 #include "G4Proton.hh" 49 #include "G4Proton.hh"
49 #include "G4PionPlus.hh" 50 #include "G4PionPlus.hh"
50 #include "G4PionMinus.hh" 51 #include "G4PionMinus.hh"
51 #include "G4NistManager.hh" 52 #include "G4NistManager.hh"
52 #include "G4Pow.hh" 53 #include "G4Pow.hh"
53 #include "G4HadronicParameters.hh" <<
54 54
55 G4double G4BGGPionInelasticXS::theGlauberFacPi << 55 #include "G4HadronicParameters.hh"
56 G4double G4BGGPionInelasticXS::theGlauberFacPi <<
57 G4double G4BGGPionInelasticXS::theLowEPiPlus[9 <<
58 G4double G4BGGPionInelasticXS::theLowEPiMinus[ <<
59 G4int G4BGGPionInelasticXS::theA[93] = {0}; <<
60 56
61 G4BGGPionInelasticXS::G4BGGPionInelasticXS(con 57 G4BGGPionInelasticXS::G4BGGPionInelasticXS(const G4ParticleDefinition* p)
62 : G4VCrossSectionDataSet("BarashenkovGlauberG << 58 : G4VCrossSectionDataSet("Barashenkov-Glauber-Gribov")
63 { 59 {
64 verboseLevel = 0; 60 verboseLevel = 0;
65 fGlauberEnergy = 91.*CLHEP::GeV; << 61 fGlauberEnergy = 91.*GeV;
66 fLowEnergy = 20.*CLHEP::MeV; << 62 fLowEnergy = 20.*MeV;
67 fLowestEnergy = 1.*CLHEP::MeV; << 63 fSAIDHighEnergyLimit = 2.6*GeV;
68 SetMinKinEnergy(0.0); 64 SetMinKinEnergy(0.0);
69 SetMaxKinEnergy( G4HadronicParameters::Insta 65 SetMaxKinEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
70 66
71 fPion = new G4UPiNuclearCrossSection(); << 67 for (G4int i = 0; i < 93; i++) {
72 fGlauber = new G4ComponentGGHadronNucleusXsc << 68 theGlauberFac[i] = 0.0;
73 fHadron = new G4HadronNucleonXsc(); << 69 theCoulombFac[i] = 0.0;
>> 70 theA[i] = 1;
>> 71 }
>> 72 fPion = nullptr;
>> 73 fGlauber = nullptr;
>> 74 fHadron = nullptr;
>> 75 fSAID = nullptr;
74 76
75 fG4pow = G4Pow::GetInstance(); 77 fG4pow = G4Pow::GetInstance();
76 78
77 theProton = G4Proton::Proton(); << 79 particle = p;
78 thePiPlus = G4PionPlus::PionPlus(); << 80 theProton= G4Proton::Proton();
79 isPiplus = (p == thePiPlus); << 81 isPiplus = (p == G4PionPlus::PionPlus()) ? true : false;
>> 82 isInitialized = false;
80 SetForAllAtomsAndEnergies(true); 83 SetForAllAtomsAndEnergies(true);
81 <<
82 if (0 == theA[0]) { Initialise(); } <<
83 } 84 }
84 85
85 //....oooOO0OOooo........oooOO0OOooo........oo 86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
86 87
87 G4BGGPionInelasticXS::~G4BGGPionInelasticXS() 88 G4BGGPionInelasticXS::~G4BGGPionInelasticXS()
88 { 89 {
89 delete fHadron; 90 delete fHadron;
90 } 91 }
91 92
92 //....oooOO0OOooo........oooOO0OOooo........oo 93 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93 94
94 G4bool 95 G4bool
95 G4BGGPionInelasticXS::IsElementApplicable(cons 96 G4BGGPionInelasticXS::IsElementApplicable(const G4DynamicParticle*, G4int,
96 cons << 97 const G4Material*)
97 { 98 {
98 return true; 99 return true;
99 } 100 }
100 101
101 //....oooOO0OOooo........oooOO0OOooo........oo 102 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102 103
103 G4bool G4BGGPionInelasticXS::IsIsoApplicable(c 104 G4bool G4BGGPionInelasticXS::IsIsoApplicable(const G4DynamicParticle*,
104 G << 105 G4int Z, G4int,
105 c << 106 const G4Element*,
106 c << 107 const G4Material*)
107 { 108 {
108 return (1 == Z); 109 return (1 == Z);
109 } 110 }
110 111
111 //....oooOO0OOooo........oooOO0OOooo........oo 112 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
112 113
113 G4double 114 G4double
114 G4BGGPionInelasticXS::GetElementCrossSection(c 115 G4BGGPionInelasticXS::GetElementCrossSection(const G4DynamicParticle* dp,
115 G << 116 G4int ZZ, const G4Material*)
116 { 117 {
117 // this method should be called only for Z > 118 // this method should be called only for Z > 1
118 119
119 G4double cross = 0.0; 120 G4double cross = 0.0;
120 G4double ekin = std::max(dp->GetKineticEnerg << 121 G4double ekin = dp->GetKineticEnergy();
121 G4int Z = std::min(ZZ, 92); 122 G4int Z = std::min(ZZ, 92);
122 <<
123 if(1 == Z) { 123 if(1 == Z) {
124 cross = 1.0115*GetIsoCrossSection(dp,1,1); 124 cross = 1.0115*GetIsoCrossSection(dp,1,1);
125 } else if(ekin < fLowEnergy) { <<
126 cross = (isPiplus) ? theLowEPiPlus[Z]*Coul <<
127 : theLowEPiMinus[Z]*FactorPiMinus(ekin); <<
128 } else if(ekin > fGlauberEnergy) { <<
129 cross = (isPiplus) ? theGlauberFacPiPlus[Z <<
130 cross *= fGlauber->GetInelasticGlauberGrib <<
131 } else { 125 } else {
132 cross = fPion->GetInelasticCrossSection(dp << 126 if(ekin <= fLowEnergy && !isPiplus) {
>> 127 cross = theCoulombFac[Z];
>> 128 } else if(ekin <= 2*MeV && isPiplus) {
>> 129 cross = theCoulombFac[Z]*CoulombFactor(ekin, Z);
>> 130 } else if(ekin > fGlauberEnergy) {
>> 131 cross = theGlauberFac[Z]*fGlauber->GetInelasticGlauberGribov(dp, Z, theA[Z]);
>> 132 } else {
>> 133 cross = fPion->GetInelasticCrossSection(dp, Z, theA[Z]);
>> 134 }
133 } 135 }
134 #ifdef G4VERBOSE <<
135 if(verboseLevel > 1) { 136 if(verboseLevel > 1) {
136 G4cout << "G4BGGPionInelasticXS::GetCrossS 137 G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
137 << dp->GetDefinition()->GetParticle << 138 << dp->GetDefinition()->GetParticleName()
138 << " Ekin(GeV)= " << dp->GetKineti << 139 << " Ekin(GeV)= " << dp->GetKineticEnergy()
139 << " in nucleus Z= " << Z << " A= << 140 << " in nucleus Z= " << Z << " A= " << theA[Z]
140 << " XS(b)= " << cross/barn << 141 << " XS(b)= " << cross/barn
141 << G4endl; << 142 << G4endl;
142 } 143 }
143 #endif <<
144 return cross; 144 return cross;
145 } 145 }
146 146
147 //....oooOO0OOooo........oooOO0OOooo........oo 147 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
148 148
149 G4double 149 G4double
150 G4BGGPionInelasticXS::GetIsoCrossSection(const 150 G4BGGPionInelasticXS::GetIsoCrossSection(const G4DynamicParticle* dp,
151 G4int << 151 G4int Z, G4int A,
152 const << 152 const G4Isotope*,
153 const << 153 const G4Element*,
154 const << 154 const G4Material*)
155 { 155 {
156 // this method should be called only for Z = 156 // this method should be called only for Z = 1
157 fHadron->HadronNucleonXscNS(dp->GetDefinitio <<
158 dp->GetKineticEn <<
159 G4double cross = A*fHadron->GetInelasticHadr <<
160 157
161 #ifdef G4VERBOSE << 158 G4double cross = 0.0;
>> 159 if(1 == Z) {
>> 160 fHadron->GetHadronNucleonXscNS(dp, theProton);
>> 161 cross = fHadron->GetInelasticHadronNucleonXsc();
>> 162 }
>> 163 cross *= A;
>> 164
162 if(verboseLevel > 1) { 165 if(verboseLevel > 1) {
163 G4cout << "G4BGGPionInelasticXS::GetCrossS 166 G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
164 << dp->GetDefinition()->GetParticle << 167 << dp->GetDefinition()->GetParticleName()
165 << " Ekin(GeV)= " << dp->GetKineti << 168 << " Ekin(GeV)= " << dp->GetKineticEnergy()
166 << " in nucleus Z=1 A=" << A << 169 << " in nucleus Z= " << Z << " A= " << A
167 << " XS(b)= " << cross/barn << 170 << " XS(b)= " << cross/barn
168 << G4endl; << 171 << G4endl;
169 } 172 }
170 #endif <<
171 return cross; 173 return cross;
172 } 174 }
173 175
174 //....oooOO0OOooo........oooOO0OOooo........oo 176 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
175 177
176 void G4BGGPionInelasticXS::BuildPhysicsTable(c 178 void G4BGGPionInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
177 { 179 {
178 if(verboseLevel > 1) { <<
179 G4cout << "G4BGGPionInelasticXS::BuildPhys <<
180 << p.GetParticleName() << G4endl; <<
181 } <<
182 if(&p == G4PionPlus::PionPlus() || &p == G4P 180 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
183 isPiplus = (&p == G4PionPlus::PionPlus()); << 181 particle = &p;
184 } else { 182 } else {
185 G4ExceptionDescription ed; << 183 G4cout << "### G4BGGPionInelasticXS WARNING: is not applicable to "
186 ed << "This BGG cross section is applicabl << 184 << p.GetParticleName()
187 << p.GetParticleName() << G4endl; << 185 << G4endl;
188 G4Exception("G4BGGPionInelasticXS::BuildPh << 186 throw G4HadronicException(__FILE__, __LINE__,
189 FatalException, ed); << 187 "G4BGGPionInelasticXS::BuildPhysicsTable is used for wrong particle");
>> 188 return;
190 } 189 }
191 } <<
192 190
193 //....oooOO0OOooo........oooOO0OOooo........oo << 191 if(isInitialized) { return; }
>> 192 isInitialized = true;
>> 193
>> 194 fPion = new G4UPiNuclearCrossSection();
>> 195 fGlauber = new G4ComponentGGHadronNucleusXsc();
>> 196 fHadron = new G4HadronNucleonXsc();
>> 197
>> 198 fPion->BuildPhysicsTable(*particle);
>> 199 fGlauber->BuildPhysicsTable(*particle);
194 200
195 void G4BGGPionInelasticXS::Initialise() <<
196 { <<
197 theA[0] = theA[1] = 1; <<
198 G4ThreeVector mom(0.0,0.0,1.0); 201 G4ThreeVector mom(0.0,0.0,1.0);
199 G4DynamicParticle dp(thePiPlus, mom, fGlaube << 202 G4DynamicParticle dp(particle, mom, fGlauberEnergy);
200 203
201 G4NistManager* nist = G4NistManager::Instanc 204 G4NistManager* nist = G4NistManager::Instance();
>> 205
202 G4double csup, csdn; 206 G4double csup, csdn;
203 207
204 for (G4int iz=2; iz<93; ++iz) { << 208 if(verboseLevel > 0) {
>> 209 G4cout << "### G4BGGPionInelasticXS::Initialise for "
>> 210 << particle->GetParticleName()
>> 211 << " isPiplus: " << isPiplus
>> 212 << G4endl;
>> 213 }
>> 214
>> 215 for(G4int iz=2; iz<93; ++iz) {
205 G4int A = G4lrint(nist->GetAtomicMassAmu(i 216 G4int A = G4lrint(nist->GetAtomicMassAmu(iz));
206 theA[iz] = A; 217 theA[iz] = A;
207 218
208 csup = fGlauber->GetInelasticGlauberGribov 219 csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, A);
209 csdn = fPion->GetInelasticCrossSection(&dp 220 csdn = fPion->GetInelasticCrossSection(&dp, iz, A);
210 theGlauberFacPiPlus[iz] = csdn/csup; <<
211 } <<
212 221
213 dp.SetDefinition(G4PionMinus::PionMinus()); << 222 theGlauberFac[iz] = csdn/csup;
214 for (G4int iz=2; iz<93; ++iz) { << 223 if(verboseLevel > 0) {
215 csup = fGlauber->GetInelasticGlauberGribov << 224 G4cout << "Z= " << iz << " A= " << A
216 csdn = fPion->GetInelasticCrossSection(&dp << 225 << " factor= " << theGlauberFac[iz] << G4endl;
217 theGlauberFacPiMinus[iz] = csdn/csup; <<
218 <<
219 if(verboseLevel > 1) { <<
220 G4cout << "Z= " << iz << " A= " << the <<
221 << " factorPiPlus= " << theGlauberFacPi <<
222 << " factorPiMinus= " << theGlauberFacP <<
223 << G4endl; <<
224 } 226 }
225 } 227 }
226 << 228 theCoulombFac[1] = 1.0;
227 theLowEPiPlus[1] = theLowEPiMinus[1]= 1.0; << 229 G4double elim = (isPiplus) ? 2*MeV : fLowEnergy;
228 dp.SetDefinition(thePiPlus); << 230 dp.SetKineticEnergy(elim);
229 dp.SetKineticEnergy(fLowEnergy); << 231
230 for (G4int iz=2; iz<93; ++iz) { << 232 for(G4int iz=2; iz<93; ++iz) {
231 theLowEPiPlus[iz] = fPion->GetInelasticCro << 233 if(isPiplus) {
232 /CoulombFactorPiPlus(fLowEnergy, iz); << 234 theCoulombFac[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz])
233 } << 235 /CoulombFactor(elim, iz);
234 << 236 } else {
235 dp.SetDefinition(G4PionMinus::PionMinus()); << 237 theCoulombFac[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz]);
236 for (G4int iz=2; iz<93; ++iz) { << 238 }
237 theLowEPiMinus[iz] = fPion->GetInelasticCr << 239 if(verboseLevel > 0) {
238 /FactorPiMinus(fLowEnergy); <<
239 <<
240 if (verboseLevel > 1) { <<
241 G4cout << "Z= " << iz << " A= " << the 240 G4cout << "Z= " << iz << " A= " << theA[iz]
242 << " LowEtorPiPlus= " << theLowEPiPlus[ << 241 << " CoulombFactor= " << theCoulombFac[iz] << G4endl;
243 << " LowEtorPiMinus= " << theLowEPiMinu <<
244 << G4endl; <<
245 } 242 }
246 } 243 }
247 } 244 }
248 245
249 //....oooOO0OOooo........oooOO0OOooo........oo 246 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
250 247
251 G4double G4BGGPionInelasticXS::CoulombFactorPi << 248 G4double G4BGGPionInelasticXS::CoulombFactor(G4double kinEnergy, G4int Z)
252 { <<
253 return (kinEnergy > 0.0) ? <<
254 G4NuclearRadii::CoulombFactor(Z, theA[Z], <<
255 } <<
256 <<
257 //....oooOO0OOooo........oooOO0OOooo........oo <<
258 <<
259 G4double G4BGGPionInelasticXS::FactorPiMinus(G <<
260 { 249 {
261 return 1.0/std::sqrt(kinEnergy); << 250 G4int A = theA[Z];
>> 251 G4double res= 0.0;
>> 252 if(kinEnergy <= DBL_MIN) { return res; }
>> 253 else if(A < 2) { return kinEnergy*kinEnergy; }
>> 254
>> 255 G4double elog = fG4pow->log10A(6.7*kinEnergy/GeV);
>> 256 G4double aa = A;
>> 257
>> 258 // from G4ProtonInelasticCrossSection
>> 259 G4double ff1 = 0.70 - 0.002*aa; // slope of the drop at medium energies.
>> 260 G4double ff2 = 1.00 + 1/aa; // start of the slope.
>> 261 G4double ff3 = 0.8 + 18/aa - 0.002*aa; // stephight
>> 262 res = 1.0 + ff3*(1.0 - (1.0/(1+fG4pow->expA(-8*ff1*(elog + 1.37*ff2)))));
>> 263
>> 264 ff1 = 1. - 1./aa - 0.001*aa; // slope of the rise
>> 265 ff2 = 1.17 - 2.7/aa-0.0014*aa; // start of the rise
>> 266 res /= (1 + fG4pow->expA(-8.*ff1*(elog + 2*ff2)));
>> 267 return res;
262 } 268 }
263 269
264 //....oooOO0OOooo........oooOO0OOooo........oo 270 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
265 271
266 void 272 void
267 G4BGGPionInelasticXS::CrossSectionDescription( 273 G4BGGPionInelasticXS::CrossSectionDescription(std::ostream& outFile) const
268 { 274 {
269 outFile << "The Barashenkov-Glauber-Gribov c 275 outFile << "The Barashenkov-Glauber-Gribov cross section handles inelastic\n"
270 << "pion scattering from nuclei at a 276 << "pion scattering from nuclei at all energies. The Barashenkov\n"
271 << "parameterization is used below 9 277 << "parameterization is used below 91 GeV and the Glauber-Gribov\n"
272 << "parameterization is used above 9 278 << "parameterization is used above 91 GeV.\n";
273 } 279 }
274 280
275 //....oooOO0OOooo........oooOO0OOooo........oo 281 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
276 282