source: trunk/source/processes/hadronic/cross_sections/src/G4UElasticCrossSection.cc @ 1315

Last change on this file since 1315 was 962, checked in by garnier, 15 years ago

update processes
File size: 7.2 KB
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26//
27// 12.08.06 V.Ivanchenko - first implementation
28// 22.01.07 V.Ivanchenko - add GetIsoZACrossSection
29// 05.03.07 V.Ivanchenko - use G4NucleonNuclearCrossSection
30// 06.03.07 V.Ivanchenko - add Initialise function
31//
32//
33
34
35#include "G4UElasticCrossSection.hh"
36
37#include "G4ParticleTable.hh"
38#include "G4GlauberGribovCrossSection.hh"
39#include "G4NucleonNuclearCrossSection.hh"
40#include "G4UPiNuclearCrossSection.hh"
41#include "G4HadronCrossSections.hh"
42#include "G4ParticleDefinition.hh"
43#include "G4Element.hh"
44#include "G4Proton.hh"
45#include "G4Neutron.hh"
46#include "G4PionPlus.hh"
47#include "G4PionMinus.hh"
48#include "G4NistManager.hh"
49
50//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
51
52G4UElasticCrossSection::G4UElasticCrossSection(const G4ParticleDefinition*) 
53{
54  verboseLevel = 0;
55  hasGlauber = false;
56  thEnergy   = 90.*GeV;
57  fGlauber   = new G4GlauberGribovCrossSection();
58  fGheisha   = G4HadronCrossSections::Instance();
59  fNucleon   = 0;
60  fUPi       = 0;
61}
62
63//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64
65G4UElasticCrossSection::~G4UElasticCrossSection()
66{
67  delete fGlauber;
68  if(fNucleon) delete fNucleon;
69  if(fUPi)     delete fUPi;
70}
71
72//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
73
74G4bool G4UElasticCrossSection::IsApplicable(const G4DynamicParticle* dp, 
75                                              const G4Element*  elm)
76{
77  return IsZAApplicable(dp, elm->GetZ(), elm->GetN());
78}
79
80//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
81
82G4bool G4UElasticCrossSection::IsZAApplicable(const G4DynamicParticle* dp, 
83                                                G4double Z, G4double A)
84{
85  G4bool res = false;
86  if(fNucleon || fUPi) res = true;
87  else res = fGheisha->IsApplicable(dp, Z, A);
88  if(verboseLevel > 1) 
89    G4cout << "G4UElasticCrossSection::IsApplicable  for "
90           << dp->GetDefinition()->GetParticleName()
91           << "  Ekin(GeV)= " << dp->GetKineticEnergy()
92           << G4endl;
93  return res;
94}
95
96//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97
98G4double G4UElasticCrossSection::GetCrossSection(const G4DynamicParticle* dp, 
99                                                   const G4Element* elm, 
100                                                   G4double temp)
101{
102  return GetIsoZACrossSection(dp, elm->GetZ(), elm->GetN(), temp);
103}
104
105//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
106
107G4double G4UElasticCrossSection::GetIsoZACrossSection(const G4DynamicParticle* dp, 
108                                                        G4double Z,
109                                                        G4double A, 
110                                                        G4double)
111{
112  G4double cross = 0.0;
113  G4double ekin = dp->GetKineticEnergy();
114  G4int iz = G4int(Z);
115  if(iz > 92) iz = 92;
116
117    // proton and neutron
118  if(fNucleon) { 
119    if(iz == 1) cross = fGheisha->GetElasticCrossSection(dp, Z, A);
120    else if(ekin > thEnergy) {
121      cross = theFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
122    } else {
123      cross = fNucleon->GetElasticCrossSection(dp, Z, A);
124    }
125
126    // pions
127  } else if(fUPi) {
128    if(iz == 1) cross = fGheisha->GetElasticCrossSection(dp, Z, A);
129    else if(ekin > thEnergy) {
130      cross = theFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
131    } else {
132      cross = fUPi->GetElasticCrossSection(dp, Z, A);
133    }
134
135    //others
136  } else {
137    if(hasGlauber && ekin > thEnergy) {
138      cross = theFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
139    } else if(fGheisha->IsApplicable(dp, Z, A)) {
140      cross = fGheisha->GetElasticCrossSection(dp, Z, A);
141    }
142  }
143
144  if(verboseLevel > 1) 
145    G4cout << "G4UElasticCrossSection::GetCrossSection  for "
146           << dp->GetDefinition()->GetParticleName()
147           << "  Ekin(GeV)= " << dp->GetKineticEnergy()
148           << " in nucleus Z= " << Z << "  A= " << A
149           << " XS(b)= " << cross/barn
150           << G4endl;
151
152  return cross;
153}
154
155//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
156
157void G4UElasticCrossSection::BuildPhysicsTable(const G4ParticleDefinition& p)
158{
159  if(&p == G4Proton::Proton() || &p == G4Neutron::Neutron()) {
160    fNucleon = new G4NucleonNuclearCrossSection();
161  } else if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
162    fUPi = new G4UPiNuclearCrossSection();
163  }
164  Initialise(&p);
165}
166
167//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
168
169void G4UElasticCrossSection::DumpPhysicsTable(const G4ParticleDefinition&) 
170{
171  G4cout << "G4UElasticCrossSection:"<<G4endl;
172}
173
174
175//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
176
177void G4UElasticCrossSection::Initialise(const G4ParticleDefinition* p) 
178{
179  G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(p);
180  G4ThreeVector mom(0.0,0.0,1.0);
181  G4DynamicParticle dp(part, mom, thEnergy);
182
183  G4NistManager* nist = G4NistManager::Instance();
184  G4double A = nist->GetAtomicMassAmu(2);
185
186  if(fGlauber->IsZAApplicable(&dp, 2.0, A)) {
187    hasGlauber = true;
188
189    if(verboseLevel > 0) G4cout << "### G4UElasticCrossSection::Initialise for "
190                                << p->GetParticleName() << G4endl;
191    G4double csup, csdn;
192    for(G4int iz=2; iz<93; iz++) {
193
194      G4double Z = G4double(iz);
195      A = nist->GetAtomicMassAmu(iz);
196      csup = fGlauber->GetElasticGlauberGribov(&dp, Z, A);
197      // proton and neutron
198      if(fNucleon) { 
199        csdn = fNucleon->GetElasticCrossSection(&dp, Z, A);
200
201        // pions
202      } else if(fUPi) {
203        csdn = fUPi->GetElasticCrossSection(&dp, Z, A);
204
205        // other
206      } else if(fGheisha->IsApplicable(&dp, Z, A)) {
207        csdn = fGheisha->GetElasticCrossSection(&dp, Z, A);
208
209      } else {
210        csdn = csup;
211      }
212      theFac[iz] = csdn/csup;
213      if(verboseLevel > 0) G4cout << "Z= " << Z <<  "  A= " << A
214                                  << " factor= " << theFac[iz] << G4endl; 
215    }
216  }
217}
218
219//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
220
221
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