| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 // -------------------------------------------------------------------
27 //
28 // GEANT4 Class file
29 //
30 //
31 // File name: G4BGGNucleonElasticXS
32 //
33 // Author: Vladimir Ivanchenko
34 //
35 // Creation date: 13.03.2007
36 //
37 // -------------------------------------------------------------------
38 //
39
40 #include "G4BGGNucleonElasticXS.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4ComponentGGHadronNucleusXsc.hh"
43 #include "G4NucleonNuclearCrossSection.hh"
44 #include "G4HadronNucleonXsc.hh"
45 #include "G4NuclearRadii.hh"
46 #include "G4Proton.hh"
47 #include "G4Neutron.hh"
48 #include "G4NistManager.hh"
49 #include "G4NuclearRadii.hh"
50
51 #include "G4CrossSectionDataSetRegistry.hh"
52
53 G4double G4BGGNucleonElasticXS::theGlauberFacP[93] = {0.0};
54 G4double G4BGGNucleonElasticXS::theCoulombFacP[93] = {0.0};
55 G4double G4BGGNucleonElasticXS::theGlauberFacN[93] = {0.0};
56 G4double G4BGGNucleonElasticXS::theCoulombFacN[93] = {0.0};
57 G4int G4BGGNucleonElasticXS::theA[93] = {0};
58
59 G4BGGNucleonElasticXS::G4BGGNucleonElasticXS(const G4ParticleDefinition* p)
60 : G4VCrossSectionDataSet("BarashenkovGlauberGribov")
61 {
62 verboseLevel = 0;
63 fGlauberEnergy = 91.*GeV;
64 fLowEnergy = 14.0*MeV;
65 fNucleon = new G4NucleonNuclearCrossSection();
66 fGlauber = new G4ComponentGGHadronNucleusXsc();
67 fHadron = new G4HadronNucleonXsc();
68
69 theProton = G4Proton::Proton();
70 isProton = (theProton == p);
71 SetForAllAtomsAndEnergies(true);
72
73 if (0 == theA[0]) { Initialise(); }
74 }
75
76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
77
78 G4BGGNucleonElasticXS::~G4BGGNucleonElasticXS()
79 {
80 delete fHadron;
81 }
82
83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
84
85 G4bool
86 G4BGGNucleonElasticXS::IsElementApplicable(const G4DynamicParticle*, G4int,
87 const G4Material*)
88 {
89 return true;
90 }
91
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93
94 G4bool G4BGGNucleonElasticXS::IsIsoApplicable(const G4DynamicParticle*,
95 G4int Z, G4int,
96 const G4Element*,
97 const G4Material*)
98 {
99 return (1 == Z);
100 }
101
102 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
103
104 G4double
105 G4BGGNucleonElasticXS::GetElementCrossSection(const G4DynamicParticle* dp,
106 G4int ZZ, const G4Material*)
107 {
108 // this method should be called only for Z > 1
109
110 G4double cross = 0.0;
111 G4int Z = std::min(ZZ, 92);
112 G4double ekin = dp->GetKineticEnergy();
113 if(1 == Z) {
114 cross = 1.0115*GetIsoCrossSection(dp,1,1);
115 } else {
116 if(ekin <= fLowEnergy) {
117 cross = (isProton) ? theCoulombFacP[Z] : theCoulombFacN[Z];
118 cross *= CoulombFactor(ekin, Z);
119 } else if(ekin > fGlauberEnergy) {
120 cross = (isProton) ? theGlauberFacP[Z] : theGlauberFacN[Z];
121 cross *= fGlauber->GetElasticGlauberGribov(dp, Z, theA[Z]);
122 } else {
123 cross = fNucleon->GetElasticCrossSection(dp, Z);
124 }
125 }
126 #ifdef G4VERBOSE
127 if (verboseLevel > 1) {
128 G4cout << "G4BGGNucleonElasticXS::GetElementCrossSection for "
129 << dp->GetDefinition()->GetParticleName()
130 << " Ekin(GeV)= " << dp->GetKineticEnergy()/CLHEP::GeV
131 << " in nucleus Z= " << Z << " A= " << theA[Z]
132 << " XS(b)= " << cross/barn
133 << G4endl;
134 }
135 #endif
136 return cross;
137 }
138
139 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
140
141 G4double
142 G4BGGNucleonElasticXS::GetIsoCrossSection(const G4DynamicParticle* dp,
143 G4int, G4int A,
144 const G4Isotope*,
145 const G4Element*,
146 const G4Material*)
147 {
148 // this method should be called only for Z = 1
149 fHadron->HadronNucleonXscNS(dp->GetDefinition(), theProton,
150 dp->GetKineticEnergy());
151 G4double cross = A*fHadron->GetElasticHadronNucleonXsc();
152
153 #ifdef G4VERBOSE
154 if (verboseLevel > 1) {
155 G4cout << "G4BGGNucleonElasticXS::GetIsoCrossSection for "
156 << dp->GetDefinition()->GetParticleName()
157 << " Ekin(GeV)= " << dp->GetKineticEnergy()/CLHEP::GeV
158 << " in nucleus Z=1 A=" << A
159 << " XS(b)= " << cross/barn
160 << G4endl;
161 }
162 #endif
163 return cross;
164 }
165
166 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
167
168 void G4BGGNucleonElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
169 {
170 if(&p == theProton || &p == G4Neutron::Neutron()) {
171 isProton = (theProton == &p);
172
173 } else {
174 G4ExceptionDescription ed;
175 ed << "This BGG cross section is applicable only to nucleons and not to "
176 << p.GetParticleName() << G4endl;
177 G4Exception("G4BGGNucleonElasticXS::BuildPhysicsTable", "had001",
178 FatalException, ed);
179 }
180 }
181
182 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
183
184 void G4BGGNucleonElasticXS::Initialise()
185 {
186 theA[0] = theA[1] = 1;
187 G4ThreeVector mom(0.0,0.0,1.0);
188 G4DynamicParticle dp(theProton, mom, fGlauberEnergy);
189
190 G4NistManager* nist = G4NistManager::Instance();
191 G4double csup, csdn;
192
193 for (G4int iz=2; iz<93; ++iz) {
194 G4int A = G4lrint(nist->GetAtomicMassAmu(iz));
195 theA[iz] = A;
196
197 csup = fGlauber->GetElasticGlauberGribov(&dp, iz, A);
198 csdn = fNucleon->GetElasticCrossSection(&dp, iz);
199 theGlauberFacP[iz] = csdn/csup;
200 }
201
202 dp.SetDefinition(G4Neutron::Neutron());
203 for (G4int iz=2; iz<93; ++iz) {
204 csup = fGlauber->GetElasticGlauberGribov(&dp, iz, theA[iz]);
205 csdn = fNucleon->GetElasticCrossSection(&dp, iz);
206 theGlauberFacN[iz] = csdn/csup;
207
208 if (verboseLevel > 1) {
209 G4cout << "G4BGGNucleonElasticXS::Initialise Z=" << iz << " A=" << theA[iz]
210 << " GFactorP=" << theGlauberFacP[iz]
211 << " GFactorN=" << theGlauberFacN[iz] << G4endl;
212 }
213 }
214
215 theCoulombFacP[0] = theCoulombFacP[1] =
216 theCoulombFacN[0] = theCoulombFacN[1] = 1.0;
217 dp.SetDefinition(theProton);
218 dp.SetKineticEnergy(fLowEnergy);
219 for (G4int iz=2; iz<93; ++iz) {
220 theCoulombFacP[iz] = fNucleon->GetElasticCrossSection(&dp, iz)
221 /CoulombFactor(fLowEnergy, iz);
222 }
223 dp.SetDefinition(G4Neutron::Neutron());
224 for(G4int iz=2; iz<93; ++iz) {
225 theCoulombFacN[iz] = fNucleon->GetElasticCrossSection(&dp, iz)
226 /CoulombFactor(fLowEnergy, iz);
227
228 if (verboseLevel > 1) {
229 G4cout << "G4BGGNucleonElasticXS::Initialise Z=" << iz << " A=" << theA[iz]
230 << " CFactorP=" << theCoulombFacP[iz]
231 << " CFactorN=" << theCoulombFacN[iz] << G4endl;
232 }
233 }
234 }
235
236 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
237
238 G4double G4BGGNucleonElasticXS::CoulombFactor(G4double kinEnergy, G4int Z)
239 {
240 return (isProton) ?
241 G4NuclearRadii::CoulombFactor(Z, theA[Z], theProton, kinEnergy) : 1.0;
242 }
243
244 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
245
246 void G4BGGNucleonElasticXS::CrossSectionDescription(std::ostream& outFile) const
247 {
248 outFile << "The Barashenkov-Glauber-Gribov cross section handles elastic\n"
249 << "scattering of protons and neutrons from nuclei using the\n"
250 << "Barashenkov parameterization below 91 GeV and the Glauber-Gribov\n"
251 << "parameterization above 91 GeV. n";
252 }
253
254 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
255