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26 // -------------------------------------------------------------------
27 //
28 // GEANT4 Class file
29 //
30 //
31 // File name: G4BGGNucleonInelasticXS
32 //
33 // Author: Vladimir Ivanchenko
34 //
35 // Creation date: 13.03.2007
36 // Modifications:
37 //
38 //
39 // -------------------------------------------------------------------
40 //
41
42 #include "G4BGGNucleonInelasticXS.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "G4ComponentGGHadronNucleusXsc.hh"
45 #include "G4NucleonNuclearCrossSection.hh"
46 #include "G4HadronNucleonXsc.hh"
47 #include "G4ComponentSAIDTotalXS.hh"
48 #include "G4Proton.hh"
49 #include "G4Neutron.hh"
50 #include "G4NistManager.hh"
51 #include "G4Material.hh"
52 #include "G4Element.hh"
53 #include "G4Isotope.hh"
54 #include "G4Log.hh"
55 #include "G4Exp.hh"
56 #include "G4NuclearRadii.hh"
57
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59
60 namespace
61 {
62 const G4double llog10 = G4Log(10.);
63 }
64
65 G4double G4BGGNucleonInelasticXS::theGlauberFacP[93] = {0.0};
66 G4double G4BGGNucleonInelasticXS::theCoulombFacP[93] = {0.0};
67 G4double G4BGGNucleonInelasticXS::theGlauberFacN[93] = {0.0};
68 G4double G4BGGNucleonInelasticXS::theCoulombFacN[93] = {0.0};
69 G4int G4BGGNucleonInelasticXS::theA[93] = {0};
70
71 G4BGGNucleonInelasticXS::G4BGGNucleonInelasticXS(const G4ParticleDefinition* p)
72 : G4VCrossSectionDataSet("BarashenkovGlauberGribov")
73 {
74 verboseLevel = 0;
75 fGlauberEnergy = 91.*CLHEP::GeV;
76 fLowEnergy = 14.*CLHEP::MeV;
77
78 fNucleon = new G4NucleonNuclearCrossSection();
79 fGlauber = new G4ComponentGGHadronNucleusXsc();
80 fHadron = new G4HadronNucleonXsc();
81
82 theProton= G4Proton::Proton();
83 isProton = (theProton == p);
84 SetForAllAtomsAndEnergies(true);
85
86 if (0 == theA[0]) { Initialise(); }
87 }
88
89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
90
91 G4BGGNucleonInelasticXS::~G4BGGNucleonInelasticXS()
92 {
93 delete fHadron;
94 }
95
96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97
98 G4bool G4BGGNucleonInelasticXS::IsElementApplicable(const G4DynamicParticle*,
99 G4int, const G4Material*)
100 {
101 return true;
102 }
103
104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
105
106 G4bool G4BGGNucleonInelasticXS::IsIsoApplicable(const G4DynamicParticle*,
107 G4int Z, G4int,
108 const G4Element*,
109 const G4Material*)
110 {
111 return (1 == Z);
112 }
113
114 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
115
116 G4double
117 G4BGGNucleonInelasticXS::GetElementCrossSection(const G4DynamicParticle* dp,
118 G4int ZZ, const G4Material*)
119 {
120 G4double cross = 0.0;
121 G4double ekin = dp->GetKineticEnergy();
122 G4int Z = std::min(ZZ, 92);
123 if (1 == Z) {
124 cross = 1.0115*GetIsoCrossSection(dp,1,1);
125 } else {
126 if (ekin <= fLowEnergy) {
127 cross = CoulombFactor(ekin, Z);
128 cross *= (isProton) ? theCoulombFacP[Z] : theCoulombFacN[Z];
129 } else if (ekin > fGlauberEnergy) {
130 cross = fGlauber->GetInelasticGlauberGribov(dp, Z, theA[Z]);
131 cross *= (isProton) ? theGlauberFacP[Z] : theGlauberFacN[Z];
132 } else {
133 cross = fNucleon->GetElementCrossSection(dp, Z);
134 }
135 }
136
137 #ifdef G4VERBOSE
138 if (verboseLevel > 1) {
139 G4cout << "G4BGGNucleonInelasticXS::GetCrossSection for "
140 << dp->GetDefinition()->GetParticleName()
141 << " Ekin(GeV)= " << dp->GetKineticEnergy()/CLHEP::GeV
142 << " in nucleus Z= " << Z << " A= " << theA[Z]
143 << " XS(b)= " << cross/barn
144 << G4endl;
145 }
146 #endif
147 return cross;
148 }
149
150 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
151
152 G4double
153 G4BGGNucleonInelasticXS::GetIsoCrossSection(const G4DynamicParticle* dp,
154 G4int, G4int A,
155 const G4Isotope*,
156 const G4Element*,
157 const G4Material*)
158 {
159 // this method should be called only for Z = 1
160 fHadron->HadronNucleonXscNS(dp->GetDefinition(), theProton,
161 dp->GetKineticEnergy());
162 G4double cross = A*fHadron->GetInelasticHadronNucleonXsc();
163
164 #ifdef G4VERBOSE
165 if(verboseLevel > 1) {
166 G4cout << "G4BGGNucleonInelasticXS::GetIsoCrossSection for "
167 << dp->GetDefinition()->GetParticleName()
168 << " Ekin(GeV)= " << dp->GetKineticEnergy()/CLHEP::GeV
169 << " in nucleus Z=1 A=" << A
170 << " XS(b)= " << cross/barn
171 << G4endl;
172 }
173 #endif
174 return cross;
175 }
176
177 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
178
179 void G4BGGNucleonInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
180 {
181 if(&p == theProton || &p == G4Neutron::Neutron()) {
182 isProton = (theProton == &p);
183 } else {
184 G4ExceptionDescription ed;
185 ed << "This BGG cross section is applicable only to nucleons and not to "
186 << p.GetParticleName() << G4endl;
187 G4Exception("G4BGGNucleonInelasticXS::BuildPhysicsTable", "had001",
188 FatalException, ed);
189 return;
190 }
191 }
192
193 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
194
195 void G4BGGNucleonInelasticXS::Initialise()
196 {
197 theA[0] = theA[1] = 1;
198 G4ThreeVector mom(0.0,0.0,1.0);
199 G4DynamicParticle dp(theProton, mom, fGlauberEnergy);
200
201 G4NistManager* nist = G4NistManager::Instance();
202 G4double csup, csdn;
203
204 for (G4int iz=2; iz<93; ++iz) {
205
206 G4int A = G4lrint(nist->GetAtomicMassAmu(iz));
207 theA[iz] = A;
208
209 csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, A);
210 csdn = fNucleon->GetElementCrossSection(&dp, iz);
211 theGlauberFacP[iz] = csdn/csup;
212 }
213
214 dp.SetDefinition(G4Neutron::Neutron());
215 for (G4int iz=2; iz<93; ++iz) {
216 csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, theA[iz]);
217 csdn = fNucleon->GetElementCrossSection(&dp, iz);
218 theGlauberFacN[iz] = csdn/csup;
219
220 if(verboseLevel > 1) {
221 G4cout << "G4BGGNucleonInelasticXS::Initialise Z= " << iz << " A= " << theA[iz]
222 << " GFactorP= " << theGlauberFacP[iz]
223 << " GFactorN= " << theGlauberFacN[iz] << G4endl;
224 }
225 }
226
227 theCoulombFacP[1] = theCoulombFacN[1] = 1.0;
228 dp.SetDefinition(theProton);
229 dp.SetKineticEnergy(fLowEnergy);
230 for (G4int iz=2; iz<93; ++iz) {
231 theCoulombFacP[iz] = fNucleon->GetElementCrossSection(&dp, iz)
232 /CoulombFactor(fLowEnergy, iz);
233 }
234 dp.SetDefinition(G4Neutron::Neutron());
235 for (G4int iz=2; iz<93; ++iz) {
236 theCoulombFacN[iz] = fNucleon->GetElementCrossSection(&dp, iz)
237 /CoulombFactor(fLowEnergy, iz);
238
239 if (verboseLevel > 1) {
240 G4cout << "G4BGGNucleonInelasticXS::Initialise Z= " << iz << " A= " << theA[iz]
241 << " CFactorP= " << theCoulombFacP[iz]
242 << " CFactorN= " << theCoulombFacN[iz] << G4endl;
243 }
244 }
245 }
246
247 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
248
249 G4double G4BGGNucleonInelasticXS::CoulombFactor(G4double kinEnergy, G4int Z)
250 {
251 G4double res = 0.0;
252
253 if(kinEnergy <= 0.0) { return res; }
254
255 G4double elog = G4Log(kinEnergy/GeV)/llog10;
256 G4double aa = theA[Z];
257
258 if(isProton) {
259
260 res = G4NuclearRadii::CoulombFactor(Z, aa, theProton, kinEnergy);
261
262 // from G4ProtonInelasticCrossSection
263 if(res > 0.0) {
264 G4double ff1 = 5.6 - 0.016*aa; // slope of the drop at medium energies.
265 G4double ff2 = 1.37 + 1.37/aa; // start of the slope.
266 G4double ff3 = 0.8 + 18./aa - 0.002*aa; // stephight
267 res *= (1.0 + ff3*(1.0 - (1.0/(1+G4Exp(-ff1*(elog + ff2))))));
268 ff1 = 8. - 8./aa - 0.008*aa; // slope of the rise
269 ff2 = 2.34 - 5.4/aa - 0.0028*aa; // start of the rise
270 res /= (1.0 + G4Exp(-ff1*(elog + ff2)));
271 }
272 } else {
273 // from G4NeutronInelasticCrossSection
274 G4double p3 = 0.6 + 13./aa - 0.0005*aa;
275 G4double p4 = 7.2449 - 0.018242*aa;
276 G4double p5 = 1.36 + 1.8/aa + 0.0005*aa;
277 G4double p6 = 1. + 200./aa + 0.02*aa;
278 G4double p7 = 3.0 - (aa-70.)*(aa-200.)/11000.;
279
280 G4double firstexp = G4Exp(-p4*(elog + p5));
281 G4double secondexp = G4Exp(-p6*(elog + p7));
282
283 res = (1. + p3*firstexp/(1. + firstexp))/(1. + secondexp);
284 }
285 return res;
286 }
287
288 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
289
290 void G4BGGNucleonInelasticXS::CrossSectionDescription(std::ostream& outFile) const
291 {
292 outFile << "The Barashenkov-Glauber-Gribov cross section calculates inelastic\n"
293 << "scattering of protons and neutrons from nuclei using the\n"
294 << "Barashenkov parameterization below 91 GeV and the Glauber-Gribov\n"
295 << "parameterization above 91 GeV. It uses the G4HadronNucleonXsc\n"
296 << "cross section component for hydrogen targets, and the\n"
297 << "G4ComponentGGHadronNucleusXsc component for other targets.\n";
298 }
299
300 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
301