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G4BGGPionInelasticXS.cc
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25 //
26 // $Id$
27 //
28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4BGGPionInelasticXS
34 //
35 // Author: Vladimir Ivanchenko
36 //
37 // Creation date: 01.10.2003
38 // Modifications:
39 //
40 // -------------------------------------------------------------------
41 //
42 
43 #include "G4BGGPionInelasticXS.hh"
44 #include "G4SystemOfUnits.hh"
45 #include "G4GlauberGribovCrossSection.hh"
46 #include "G4UPiNuclearCrossSection.hh"
47 #include "G4HadronNucleonXsc.hh"
48 //#include "G4HadronInelasticDataSet.hh"
49 #include "G4ComponentSAIDTotalXS.hh"
50 
51 #include "G4Proton.hh"
52 #include "G4PionPlus.hh"
53 #include "G4PionMinus.hh"
54 #include "G4NistManager.hh"
55 
56 
57 G4BGGPionInelasticXS::G4BGGPionInelasticXS(const G4ParticleDefinition* p)
58  : G4VCrossSectionDataSet("Barashenkov-Glauber-Gribov")
59 {
60  verboseLevel = 0;
61  fGlauberEnergy = 91.*GeV;
62  fLowEnergy = 20.*MeV;
63  fSAIDHighEnergyLimit = 2.6*GeV;
64  SetMinKinEnergy(0.0);
65  SetMaxKinEnergy(100*TeV);
66 
67  for (G4int i = 0; i < 93; i++) {
68  theGlauberFac[i] = 0.0;
69  theCoulombFac[i] = 0.0;
70  theA[i] = 1;
71  }
72  fPion = 0;
73  fGlauber = 0;
74  fHadron = 0;
75  // fGHEISHA = 0;
76  fSAID = 0;
77  particle = p;
78  theProton= G4Proton::Proton();
79  isPiplus = false;
80  isInitialized = false;
81 }
82 
83 
84 G4BGGPionInelasticXS::~G4BGGPionInelasticXS()
85 {
86  delete fGlauber;
87  delete fPion;
88  delete fHadron;
89  delete fSAID;
90 }
91 
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93 
94 G4bool
95 G4BGGPionInelasticXS::IsElementApplicable(const G4DynamicParticle*, G4int,
96  const G4Material*)
97 {
98  return true;
99 }
100 
101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102 
103 G4bool G4BGGPionInelasticXS::IsIsoApplicable(const G4DynamicParticle*,
104  G4int Z, G4int A,
105  const G4Element*,
106  const G4Material*)
107 {
108  return (1 == Z && 2 >= A);
109 }
110 
111 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
112 
113 G4double
114 G4BGGPionInelasticXS::GetElementCrossSection(const G4DynamicParticle* dp,
115  G4int ZZ, const G4Material*)
116 {
117  // this method should be called only for Z > 1
118 
119  G4double cross = 0.0;
120  G4double ekin = dp->GetKineticEnergy();
121  G4int Z = ZZ;
122  if(1 == Z) {
123  cross = 1.0115*GetIsoCrossSection(dp,1,1);
124  } else {
125  if(Z > 92) { Z = 92; }
126 
127  if(ekin <= fLowEnergy && !isPiplus) {
128  cross = theCoulombFac[Z];
129  } else if(ekin <= 2*MeV && isPiplus) {
130  cross = theCoulombFac[Z]*CoulombFactor(ekin, Z);
131  } else if(ekin > fGlauberEnergy) {
132  cross = theGlauberFac[Z]*fGlauber->GetInelasticGlauberGribov(dp, Z, theA[Z]);
133  } else {
134  cross = fPion->GetInelasticCrossSection(dp, Z, theA[Z]);
135  }
136  }
137  if(verboseLevel > 1) {
138  G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
139  << dp->GetDefinition()->GetParticleName()
140  << " Ekin(GeV)= " << dp->GetKineticEnergy()
141  << " in nucleus Z= " << Z << " A= " << theA[Z]
142  << " XS(b)= " << cross/barn
143  << G4endl;
144  }
145  return cross;
146 }
147 
148 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
149 
150 G4double
151 G4BGGPionInelasticXS::GetIsoCrossSection(const G4DynamicParticle* dp,
152  G4int Z, G4int A,
153  const G4Isotope*,
154  const G4Element*,
155  const G4Material*)
156 {
157  // this method should be called only for Z = 1
158 
159  G4double cross = 0.0;
160  G4double ekin = dp->GetKineticEnergy();
161 
162  if(ekin <= fSAIDHighEnergyLimit) {
163  cross = fSAID->GetInelasticIsotopeCrossSection(particle, ekin, 1, 1);
164  } else {
165  fHadron->GetHadronNucleonXscPDG(dp, theProton);
166  cross = (theCoulombFac[1]/ekin + 1)*fHadron->GetInelasticHadronNucleonXsc();
167  }
168  /*
169  if(isPiplus) {
170  if(ekin <= 20*GeV) {
171  cross = theCoulombFac[1]*fGHEISHA->GetElementCrossSection(dp, 1, mat);
172  } else {
173  fHadron->GetHadronNucleonXscPDG(dp, theProton);
174  cross = fHadron->GetInelasticHadronNucleonXsc();
175  }
176  } else {
177  if(ekin <= fLowEnergy) {
178  cross = theCoulombFac[1];
179  } else if(ekin <= 20*GeV) {
180  fHadron->GetHadronNucleonXscNS(dp, theProton);
181  cross = theGlauberFac[1]*fHadron->GetInelasticHadronNucleonXsc();
182  } else {
183  fHadron->GetHadronNucleonXscPDG(dp, theProton);
184  cross = fHadron->GetInelasticHadronNucleonXsc();
185  }
186  }
187  */
188  cross *= A;
189 
190  if(verboseLevel > 1) {
191  G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
192  << dp->GetDefinition()->GetParticleName()
193  << " Ekin(GeV)= " << dp->GetKineticEnergy()
194  << " in nucleus Z= " << Z << " A= " << A
195  << " XS(b)= " << cross/barn
196  << G4endl;
197  }
198  return cross;
199 }
200 
201 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
202 
203 void G4BGGPionInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
204 {
205  if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
206  particle = &p;
207  } else {
208  G4cout << "### G4BGGPionInelasticXS WARNING: is not applicable to "
209  << p.GetParticleName()
210  << G4endl;
211  throw G4HadronicException(__FILE__, __LINE__,
212  "G4BGGPionInelasticXS::BuildPhysicsTable is used for wrong particle");
213  return;
214  }
215 
216  if(isInitialized) { return; }
217  isInitialized = true;
218 
219  fPion = new G4UPiNuclearCrossSection();
220  fGlauber = new G4GlauberGribovCrossSection();
221  fHadron = new G4HadronNucleonXsc();
222  // fGHEISHA = new G4HadronInelasticDataSet();
223  fSAID = new G4ComponentSAIDTotalXS();
224 
225  fPion->BuildPhysicsTable(*particle);
226  fGlauber->BuildPhysicsTable(*particle);
227  if(particle == G4PionPlus::PionPlus()) { isPiplus = true; }
228 
229  G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
230  G4ThreeVector mom(0.0,0.0,1.0);
231  G4DynamicParticle dp(part, mom, fGlauberEnergy);
232 
233  G4NistManager* nist = G4NistManager::Instance();
234 
235  G4double csup, csdn;
236  G4int A;
237 
238  if(verboseLevel > 0) {
239  G4cout << "### G4BGGPionInelasticXS::Initialise for "
240  << particle->GetParticleName()
241  << " isPiplus: " << isPiplus
242  << G4endl;
243  }
244 
245  for(G4int iz=2; iz<93; iz++) {
246 
247  A = G4lrint(nist->GetAtomicMassAmu(iz));
248  theA[iz] = A;
249 
250  csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, A);
251  csdn = fPion->GetInelasticCrossSection(&dp, iz, theA[iz]);
252 
253  theGlauberFac[iz] = csdn/csup;
254  if(verboseLevel > 0) {
255  G4cout << "Z= " << iz << " A= " << A
256  << " factor= " << theGlauberFac[iz] << G4endl;
257  }
258  }
259  dp.SetKineticEnergy(fSAIDHighEnergyLimit);
260  fHadron->GetHadronNucleonXscPDG(&dp, theProton);
261  theCoulombFac[1] = fSAIDHighEnergyLimit*
262  (fSAID->GetInelasticIsotopeCrossSection(particle,fSAIDHighEnergyLimit,1,1)
263  /fHadron->GetInelasticHadronNucleonXsc() - 1);
264 
265  /*
266  dp.SetKineticEnergy(20*GeV);
267  const G4Material* mat = 0;
268  if(isPiplus) {
269  fHadron->GetHadronNucleonXscPDG(&dp, theProton);
270  theCoulombFac[1] = fHadron->GetInelasticHadronNucleonXsc()
271  /fGHEISHA->GetElementCrossSection(&dp, 1, mat);
272  } else {
273  fHadron->GetHadronNucleonXscPDG(&dp, theProton);
274  theGlauberFac[1] = fHadron->GetInelasticHadronNucleonXsc();
275  fHadron->GetHadronNucleonXscNS(&dp, theProton);
276  theGlauberFac[1] /= fHadron->GetInelasticHadronNucleonXsc();
277  }
278  */
279  if(isPiplus) {
280  dp.SetKineticEnergy(2*MeV);
281  for(G4int iz=2; iz<93; iz++) {
282  theCoulombFac[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz])
283  /CoulombFactor(2*MeV,iz);
284  }
285 
286  } else {
287  dp.SetKineticEnergy(fLowEnergy);
288  //fHadron->GetHadronNucleonXscNS(&dp, theProton);
289  //theCoulombFac[1] = theGlauberFac[1]*fHadron->GetInelasticHadronNucleonXsc();
290  for(G4int iz=2; iz<93; iz++) {
291  theCoulombFac[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz]);
292  }
293  }
294 }
295 
296 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
297 
298 G4double G4BGGPionInelasticXS::CoulombFactor(G4double kinEnergy, G4int Z)
299 {
300  G4int A = theA[Z];
301  G4double res= 0.0;
302  if(kinEnergy <= DBL_MIN) { return res; }
303  else if(A < 2) { return kinEnergy*kinEnergy; }
304 
305  G4double elog = std::log10(6.7*kinEnergy/GeV);
306  G4double aa = A;
307 
308  // from G4ProtonInelasticCrossSection
309  G4double ff1 = 0.70 - 0.002*aa; // slope of the drop at medium energies.
310  G4double ff2 = 1.00 + 1/aa; // start of the slope.
311  G4double ff3 = 0.8 + 18/aa - 0.002*aa; // stephight
312  res = 1.0 + ff3*(1.0 - (1.0/(1+std::exp(-8*ff1*(elog + 1.37*ff2)))));
313 
314  ff1 = 1. - 1./aa - 0.001*aa; // slope of the rise
315  ff2 = 1.17 - 2.7/aa-0.0014*aa; // start of the rise
316  res /= (1 + std::exp(-8.*ff1*(elog + 2*ff2)));
317  /*
318  G4double f1 = 8.0 - 8.0/aa - 0.008*aa;
319  G4double f2 = 2.34 - 5.4/aa - 0.0028*aa;
320 
321  res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
322 
323  f1 = 5.6 - 0.016*aa;
324  f2 = 1.37 + 1.37/aa;
325  res *= ( 1.0 + (0.8 + 18./aa - 0.002*aa)/(1.0 + std::exp(f1*(elog + f2))));
326  */
327  return res;
328 }
329 
330 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
331 
332 void
333 G4BGGPionInelasticXS::CrossSectionDescription(std::ostream& outFile) const
334 {
335  outFile << "The Barashenkov-Glauber-Gribov cross section handles inelastic\n"
336  << "pion scattering from nuclei at all energies. The Barashenkov\n"
337  << "parameterization is used below 91 GeV and the Glauber-Gribov\n"
338  << "parameterization is used above 91 GeV.\n";
339 }
340 
341 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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