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>> 26 // $Id: G4BGGPionElasticXS.cc,v 1.12 2011-01-09 02:37:48 dennis Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4BGGPionElasticXS 34 // File name: G4BGGPionElasticXS
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 01.10.2003 38 // Creation date: 01.10.2003
37 // Modifications: 39 // Modifications:
38 // 40 //
39 // ------------------------------------------- 41 // -------------------------------------------------------------------
40 // 42 //
41 43
42 #include "G4BGGPionElasticXS.hh" 44 #include "G4BGGPionElasticXS.hh"
43 #include "G4SystemOfUnits.hh" << 45 #include "G4GlauberGribovCrossSection.hh"
44 #include "G4ComponentGGHadronNucleusXsc.hh" <<
45 #include "G4UPiNuclearCrossSection.hh" 46 #include "G4UPiNuclearCrossSection.hh"
46 #include "G4HadronNucleonXsc.hh" 47 #include "G4HadronNucleonXsc.hh"
47 #include "G4NuclearRadii.hh" <<
48 <<
49 #include "G4Proton.hh" <<
50 #include "G4PionPlus.hh" 48 #include "G4PionPlus.hh"
51 #include "G4PionMinus.hh" 49 #include "G4PionMinus.hh"
52 #include "G4NistManager.hh" 50 #include "G4NistManager.hh"
53 #include "G4HadronicParameters.hh" <<
54 #include "G4Pow.hh" <<
55 <<
56 G4double G4BGGPionElasticXS::theGlauberFacPiPl <<
57 G4double G4BGGPionElasticXS::theCoulombFacPiPl <<
58 G4double G4BGGPionElasticXS::theGlauberFacPiMi <<
59 G4double G4BGGPionElasticXS::theCoulombFacPiMi <<
60 G4int G4BGGPionElasticXS::theA[93] = {0}; <<
61 51
62 //....oooOO0OOooo........oooOO0OOooo........oo <<
63 52
64 G4BGGPionElasticXS::G4BGGPionElasticXS(const G << 53 G4BGGPionElasticXS::G4BGGPionElasticXS(const G4ParticleDefinition*)
65 : G4VCrossSectionDataSet("BarashenkovGlauberG << 54 : G4VCrossSectionDataSet("Barashenkov-Glauber-Gribov")
66 { 55 {
67 verboseLevel = 0; 56 verboseLevel = 0;
68 fGlauberEnergy = 91.*CLHEP::GeV; << 57 fGlauberEnergy = 91.*GeV;
69 fLowEnergy = 20.*CLHEP::MeV; << 58 fLowEnergy = 20.*MeV;
70 fLowestEnergy = 1.*CLHEP::MeV; <<
71 SetMinKinEnergy(0.0); 59 SetMinKinEnergy(0.0);
72 SetMaxKinEnergy( G4HadronicParameters::Insta << 60 SetMaxKinEnergy(100*TeV);
73 <<
74 fPion = new G4UPiNuclearCrossSection(); <<
75 fGlauber = new G4ComponentGGHadronNucleusXsc <<
76 fHadron = new G4HadronNucleonXsc(); <<
77 <<
78 fG4pow = G4Pow::GetInstance(); <<
79 <<
80 theProton = G4Proton::Proton(); <<
81 thePiPlus = G4PionPlus::PionPlus(); <<
82 isPiplus = (p == thePiPlus); <<
83 SetForAllAtomsAndEnergies(true); <<
84 61
85 if (0 == theA[0]) { Initialise(); } << 62 for (G4int i = 0; i < 93; i++) {
>> 63 theGlauberFac[i] = 0.0;
>> 64 theCoulombFac[i] = 0.0;
>> 65 }
>> 66 fPion = 0;
>> 67 fGlauber = 0;
>> 68 fHadron = 0;
>> 69 particle = 0;
>> 70 isPiplus = false;
>> 71 isInitialized = false;
86 } 72 }
87 73
88 //....oooOO0OOooo........oooOO0OOooo........oo <<
89 74
90 G4BGGPionElasticXS::~G4BGGPionElasticXS() 75 G4BGGPionElasticXS::~G4BGGPionElasticXS()
91 { 76 {
>> 77 delete fGlauber;
>> 78 delete fPion;
92 delete fHadron; 79 delete fHadron;
93 } 80 }
94 81
95 //....oooOO0OOooo........oooOO0OOooo........oo <<
96 <<
97 G4bool <<
98 G4BGGPionElasticXS::IsElementApplicable(const <<
99 const <<
100 { <<
101 return true; <<
102 } <<
103 <<
104 //....oooOO0OOooo........oooOO0OOooo........oo <<
105 <<
106 G4bool G4BGGPionElasticXS::IsIsoApplicable(con <<
107 G4i <<
108 con <<
109 { <<
110 return (1 == Z); <<
111 } <<
112 <<
113 //....oooOO0OOooo........oooOO0OOooo........oo <<
114 82
115 G4double 83 G4double
116 G4BGGPionElasticXS::GetElementCrossSection(con << 84 G4BGGPionElasticXS::GetZandACrossSection(const G4DynamicParticle* dp,
117 G4i << 85 G4int Z, G4int A, G4double)
118 { 86 {
119 // this method should be called only for Z > <<
120 G4double cross = 0.0; 87 G4double cross = 0.0;
121 G4double ekin = std::max(dp->GetKineticEnerg << 88 G4double ekin = dp->GetKineticEnergy();
122 G4int Z = std::min(ZZ, 92); << 89 if(Z > 92) Z = 92;
123 if(1 == Z) { << 90
124 cross = 1.0115*GetIsoCrossSection(dp,1,1); << 91 if(ekin <= fLowEnergy) {
125 } else { << 92 cross = theCoulombFac[Z];
126 if(ekin <= fLowEnergy) { << 93
127 cross = (isPiplus) ? theCoulombFacPiPlus << 94 } else if(Z == 1) {
128 : theCoulombFacPiMinus[Z]*FactorPiMinu << 95 if( A < 2) {
129 } else if(ekin > fGlauberEnergy) { << 96 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
130 cross = (isPiplus) ? theGlauberFacPiPlus << 97 cross = fHadron->GetElasticHadronNucleonXsc();
131 cross *= fGlauber->GetElasticGlauberGrib <<
132 } else { 98 } else {
133 cross = fPion->GetElasticCrossSection(dp << 99 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
>> 100 cross = fHadron->GetElasticHadronNucleonXsc();
>> 101 fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron());
>> 102 cross += fHadron->GetElasticHadronNucleonXsc();
134 } 103 }
>> 104 } else if(ekin > fGlauberEnergy) {
>> 105 cross = theGlauberFac[Z]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
>> 106 } else {
>> 107 cross = fPion->GetElasticCrossSection(dp, Z, A);
135 } 108 }
136 #ifdef G4VERBOSE <<
137 if(verboseLevel > 1) { <<
138 G4cout << "G4BGGPionElasticXS::GetElementC <<
139 << dp->GetDefinition()->GetParticle <<
140 << " Ekin(GeV)= " << dp->GetKineti <<
141 << " in nucleus Z= " << Z << " A= <<
142 << " XS(b)= " << cross/barn <<
143 << G4endl; <<
144 } <<
145 #endif <<
146 return cross; <<
147 } <<
148 109
149 //....oooOO0OOooo........oooOO0OOooo........oo << 110 if(verboseLevel > 1)
>> 111 G4cout << "G4BGGPionElasticXS::GetCrossSection for "
>> 112 << dp->GetDefinition()->GetParticleName()
>> 113 << " Ekin(GeV)= " << dp->GetKineticEnergy()
>> 114 << " in nucleus Z= " << Z << " A= " << A
>> 115 << " XS(b)= " << cross/barn
>> 116 << G4endl;
150 117
151 G4double <<
152 G4BGGPionElasticXS::GetIsoCrossSection(const G <<
153 G4int, <<
154 const G <<
155 const G <<
156 const G <<
157 { <<
158 // this method should be called only for Z = <<
159 fHadron->HadronNucleonXscNS(dp->GetDefinitio <<
160 dp->GetKineticEn <<
161 G4double cross = A*fHadron->GetElasticHadron <<
162 <<
163 #ifdef G4VERBOSE <<
164 if(verboseLevel > 1) { <<
165 G4cout << "G4BGGPionElasticXS::GetIsoCross <<
166 << dp->GetDefinition()->GetParticle <<
167 << " Ekin(GeV)= " << dp->GetKineti <<
168 << " in nucleus Z=1 A=" << A <<
169 << " XS(b)= " << cross/barn <<
170 << G4endl; <<
171 } <<
172 #endif <<
173 return cross; 118 return cross;
174 } 119 }
175 120
176 //....oooOO0OOooo........oooOO0OOooo........oo 121 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
177 122
178 void G4BGGPionElasticXS::BuildPhysicsTable(con 123 void G4BGGPionElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
179 { 124 {
180 if(verboseLevel > 1) { <<
181 G4cout << "G4BGGPionElasticXS::BuildPhysic <<
182 << p.GetParticleName() << G4endl; <<
183 } <<
184 if(&p == G4PionPlus::PionPlus() || &p == G4P 125 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
185 isPiplus = (&p == G4PionPlus::PionPlus()); << 126 particle = &p;
>> 127 Initialise();
186 } else { 128 } else {
187 G4ExceptionDescription ed; << 129 G4cout << "### G4BGGPionElasticXS WARNING: is not applicable to "
188 ed << "This BGG cross section is applicabl << 130 << p.GetParticleName()
189 << p.GetParticleName() << G4endl; << 131 << G4endl;
190 G4Exception("G4BGGPionElasticXS::BuildPhys <<
191 FatalException, ed); <<
192 } 132 }
193 } 133 }
194 134
195 //....oooOO0OOooo........oooOO0OOooo........oo <<
196 135
197 void G4BGGPionElasticXS::Initialise() << 136 void G4BGGPionElasticXS::DumpPhysicsTable(const G4ParticleDefinition&)
>> 137 {
>> 138 G4cout << std::setw(24) << " "
>> 139 << " G4BGGPionElasticXS: Barashenkov cross sections below 100 GeV, "
>> 140 << G4endl;
>> 141 G4cout << std::setw(26) << " "
>> 142 << " Glauber-Gribov above "
>> 143 << G4endl;
>> 144 }
>> 145
>> 146
>> 147 void G4BGGPionElasticXS::Initialise()
198 { 148 {
199 theA[0] = theA[1] = 1; << 149 if(isInitialized) return;
>> 150 isInitialized = true;
>> 151
>> 152 fPion = new G4UPiNuclearCrossSection();
>> 153 fGlauber = new G4GlauberGribovCrossSection();
>> 154 fHadron = new G4HadronNucleonXsc();
>> 155 fPion->BuildPhysicsTable(*particle);
>> 156 fGlauber->BuildPhysicsTable(*particle);
>> 157 if(particle == G4PionPlus::PionPlus()) isPiplus = true;
>> 158
>> 159 G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
200 G4ThreeVector mom(0.0,0.0,1.0); 160 G4ThreeVector mom(0.0,0.0,1.0);
201 G4DynamicParticle dp(thePiPlus, mom, fGlaube << 161 G4DynamicParticle dp(part, mom, fGlauberEnergy);
202 162
203 G4NistManager* nist = G4NistManager::Instanc 163 G4NistManager* nist = G4NistManager::Instance();
204 164
205 G4double csup, csdn; 165 G4double csup, csdn;
206 for (G4int iz=2; iz<93; ++iz) { << 166 G4int A;
>> 167
>> 168 if(verboseLevel > 0) G4cout << "### G4BGGPionElasticXS::Initialise for "
>> 169 << particle->GetParticleName() << G4endl;
207 170
208 G4int A = G4lrint(nist->GetAtomicMassAmu(i << 171 for(G4int iz=2; iz<93; iz++) {
209 theA[iz] = A; << 172
>> 173 G4double Z = G4double(iz);
>> 174 A = G4lrint(nist->GetAtomicMassAmu(iz));
210 175
211 csup = fGlauber->GetElasticGlauberGribov(& 176 csup = fGlauber->GetElasticGlauberGribov(&dp, iz, A);
212 csdn = fPion->GetElasticCrossSection(&dp, 177 csdn = fPion->GetElasticCrossSection(&dp, iz, A);
213 theGlauberFacPiPlus[iz] = csdn/csup; <<
214 } <<
215 178
216 dp.SetDefinition(G4PionMinus::PionMinus()); << 179 theGlauberFac[iz] = csdn/csup;
217 for (G4int iz=2; iz<93; ++iz) { << 180 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
218 csup = fGlauber->GetElasticGlauberGribov(& << 181 << " factor= " << theGlauberFac[iz] << G4endl;
219 csdn = fPion->GetElasticCrossSection(&dp, <<
220 theGlauberFacPiMinus[iz] = csdn/csup; <<
221 <<
222 if (verboseLevel > 1) { <<
223 G4cout << "Z= " << iz << " A= " << the <<
224 << " factorPiPlus= " << theGlauberFacPi <<
225 << " factorPiMinus= " << theGlauberFacP <<
226 << G4endl; <<
227 } <<
228 } 182 }
229 theCoulombFacPiPlus[1] = 1.0; <<
230 theCoulombFacPiMinus[1]= 1.0; <<
231 dp.SetKineticEnergy(fLowEnergy); 183 dp.SetKineticEnergy(fLowEnergy);
232 dp.SetDefinition(thePiPlus); << 184 fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton());
233 for (G4int iz=2; iz<93; ++iz) { << 185 theCoulombFac[1] = fHadron->GetElasticHadronNucleonXsc();
234 theCoulombFacPiPlus[iz] = fPion->GetElasti <<
235 /CoulombFactorPiPlus(fLowEnergy, iz); <<
236 } <<
237 dp.SetDefinition(G4PionMinus::PionMinus()); <<
238 for(G4int iz=2; iz<93; ++iz) { <<
239 theCoulombFacPiMinus[iz] = fPion->GetElast <<
240 /FactorPiMinus(fLowEnergy); <<
241 <<
242 if(verboseLevel > 1) { <<
243 G4cout << "Z= " << iz << " A= " << the <<
244 << " CoulombFactorPiPlus= " << theCoulo <<
245 << " CoulombFactorPiMinus= " << theCoul <<
246 << G4endl; <<
247 } <<
248 } <<
249 } <<
250 186
251 //....oooOO0OOooo........oooOO0OOooo........oo << 187 for(G4int iz=2; iz<93; iz++) {
252 188
253 G4double G4BGGPionElasticXS::CoulombFactorPiPl << 189 G4double Z = G4double(iz);
254 { << 190 A = G4lrint(nist->GetAtomicMassAmu(iz));
255 return (kinEnergy > 0.0) ? << 191
256 G4NuclearRadii::CoulombFactor(Z, theA[Z], << 192 theCoulombFac[iz] = fPion->GetElasticCrossSection(&dp, iz, A);
>> 193 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
>> 194 << " factor= " << theCoulombFac[iz] << G4endl;
>> 195 }
257 } 196 }
258 197
259 //....oooOO0OOooo........oooOO0OOooo........oo <<
260 198
261 G4double G4BGGPionElasticXS::FactorPiMinus(G4d << 199 G4double G4BGGPionElasticXS::CoulombFactor(G4double kinEnergy, G4int A)
262 { 200 {
263 return 1.0/std::sqrt(kinEnergy); << 201 G4double res= 0.0;
264 } << 202 if(kinEnergy <= DBL_MIN) return res;
>> 203 else if(A < 2) return kinEnergy*kinEnergy;
>> 204
>> 205 G4double elog = std::log10(kinEnergy/GeV);
>> 206 G4double aa = A;
265 207
266 //....oooOO0OOooo........oooOO0OOooo........oo << 208 // from G4ProtonInelasticCrossSection
>> 209 G4double f1 = 8.0 - 8.0/aa - 0.008*aa;
>> 210 G4double f2 = 2.34 - 5.4/aa - 0.0028*aa;
267 211
268 void << 212 res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
269 G4BGGPionElasticXS::CrossSectionDescription(st << 213
270 { << 214 f1 = 5.6 - 0.016*aa;
271 outFile << "The Barashenkov-Glauber-Gribov c << 215 f2 = 1.37 + 1.37/aa;
272 << "scattering of pions from nuclei << 216 res *= ( 1.0 + (0.8 + 18./aa - 0.002*aa)/(1.0 + std::exp(f1*(elog + f2))));
273 << "Barashenkov parameterization is << 217 return res;
274 << "Glauber-Gribov parameterization <<
275 } 218 }
276 219
277 //....oooOO0OOooo........oooOO0OOooo........oo <<
278 220