source: trunk/source/processes/hadronic/cross_sections/src/G4BGGNucleonElasticXS.cc @ 1200

Last change on this file since 1200 was 1196, checked in by garnier, 15 years ago

update CVS release candidate geant4.9.3.01
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26// $Id: G4BGGNucleonElasticXS.cc,v 1.5 2009/11/19 12:30:48 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03-cand-01 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name:     G4BGGNucleonElasticXS
35//
36// Author:        Vladimir Ivanchenko
37//
38// Creation date: 13.03.2007
39// Modifications:
40//
41//
42// -------------------------------------------------------------------
43//
44
45#include "G4BGGNucleonElasticXS.hh"
46#include "G4GlauberGribovCrossSection.hh"
47#include "G4NucleonNuclearCrossSection.hh"
48#include "G4HadronNucleonXsc.hh"
49#include "G4Proton.hh"
50#include "G4Neutron.hh"
51#include "G4NistManager.hh"
52
53//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54
55G4BGGNucleonElasticXS::G4BGGNucleonElasticXS(const G4ParticleDefinition*) 
56{
57  verboseLevel = 0;
58  fGlauberEnergy = 91.*GeV;
59  fLowEnergy = 20.*MeV;
60  fNucleon = 0;
61  fGlauber = 0;
62  fHadron  = 0;
63  particle = 0;
64  isProton = false;
65  isInitialized = false;
66}
67
68//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70G4BGGNucleonElasticXS::~G4BGGNucleonElasticXS()
71{
72  delete fGlauber;
73  delete fNucleon;
74  delete fHadron;
75}
76
77//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78
79G4double G4BGGNucleonElasticXS::GetIsoZACrossSection(const G4DynamicParticle* dp, 
80                                                       G4double Z,
81                                                       G4double A, 
82                                                       G4double)
83{
84  G4double cross = 0.0;
85  G4double ekin = dp->GetKineticEnergy();
86  G4int iz = G4int(Z);
87  if(iz > 92) iz = 92;
88
89  if(ekin <= fLowEnergy) {
90    cross = theCoulombFac[iz];
91    if(isProton) { cross *= CoulombFactor(ekin, A); }
92
93  } else if(iz == 1) {
94    if( A < 1.5) {
95      //fHadron->GetHadronNucleonXscPDG(dp, G4Proton::Proton());
96      //fHadron->GetHadronNucleonXscEL(dp, G4Proton::Proton());
97      //fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
98      fHadron->GetHadronNucleonXscMK(dp, G4Proton::Proton());
99      cross = fHadron->GetElasticHadronNucleonXsc();
100    } else {
101      fHadron->GetHadronNucleonXscMK(dp, G4Proton::Proton());
102      cross = fHadron->GetElasticHadronNucleonXsc();
103      fHadron->GetHadronNucleonXscMK(dp, G4Neutron::Neutron());
104      cross += fHadron->GetElasticHadronNucleonXsc();
105    }
106  } else if(ekin > fGlauberEnergy) {
107    cross = theGlauberFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
108  } else {
109    cross = fNucleon->GetElasticCrossSection(dp, Z, A);
110  }
111
112  if(verboseLevel > 1) 
113    G4cout << "G4BGGNucleonElasticXS::GetCrossSection  for "
114           << dp->GetDefinition()->GetParticleName()
115           << "  Ekin(GeV)= " << dp->GetKineticEnergy()
116           << " in nucleus Z= " << Z << "  A= " << A
117           << " XS(b)= " << cross/barn
118           << G4endl;
119
120  return cross;
121}
122
123//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124
125void G4BGGNucleonElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
126{
127  if(&p == G4Proton::Proton() || &p == G4Neutron::Neutron()) {
128    particle = &p;
129    Initialise();
130  } else {
131    G4cout << "### G4BGGNucleonElasticXS WARNING: is not applicable to " 
132           << p.GetParticleName()
133           << G4endl;
134  }
135}
136
137//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
138
139void G4BGGNucleonElasticXS::DumpPhysicsTable(const G4ParticleDefinition&) 
140{
141  G4cout << "G4BGGNucleonElasticXS:"<<G4endl;
142}
143
144//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
145
146void G4BGGNucleonElasticXS::Initialise() 
147{
148  if(isInitialized) return;
149  isInitialized = true;
150
151  fNucleon = new G4NucleonNuclearCrossSection();
152  fGlauber = new G4GlauberGribovCrossSection();
153  fHadron  = new G4HadronNucleonXsc();
154  fNucleon->BuildPhysicsTable(*particle);
155  fGlauber->BuildPhysicsTable(*particle);
156  if(particle == G4Proton::Proton()) isProton = true;
157
158  G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
159  G4ThreeVector mom(0.0,0.0,1.0);
160  G4DynamicParticle dp(part, mom, fGlauberEnergy);
161
162  G4NistManager* nist = G4NistManager::Instance();
163
164  G4double A, csup, csdn;
165
166  if(verboseLevel > 0) G4cout << "### G4BGGNucleonElasticXS::Initialise for "
167                              << particle->GetParticleName() << G4endl;
168
169  for(G4int iz=2; iz<93; iz++) {
170
171    G4double Z = G4double(iz);
172    A = nist->GetAtomicMassAmu(iz);
173
174    csup = fGlauber->GetElasticGlauberGribov(&dp, Z, A);
175    csdn = fNucleon->GetElasticCrossSection(&dp, Z, A);
176
177    theGlauberFac[iz] = csdn/csup;
178    if(verboseLevel > 0) G4cout << "Z= " << Z <<  "  A= " << A
179                                << " factor= " << theGlauberFac[iz] << G4endl; 
180  }
181  dp.SetKineticEnergy(fLowEnergy);
182  fHadron->GetHadronNucleonXscMK(&dp, G4Proton::Proton());
183  theCoulombFac[1] = fHadron->GetElasticHadronNucleonXsc();
184  if(isProton) { theCoulombFac[1] /= CoulombFactor(fLowEnergy, 1.0); }
185
186  for(G4int iz=2; iz<93; iz++) {
187
188    G4double Z = G4double(iz);
189    A = nist->GetAtomicMassAmu(iz);
190
191    theCoulombFac[iz] = fNucleon->GetElasticCrossSection(&dp, Z, A);
192    if(isProton) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy, A); }
193    if(verboseLevel > 0) G4cout << "Z= " << Z <<  "  A= " << A
194                                << " factor= " << theCoulombFac[iz] << G4endl; 
195  }
196}
197
198//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
199
200G4double G4BGGNucleonElasticXS::CoulombFactor(G4double kinEnergy, G4double A)
201{
202  G4double res= 0.0;
203  if(kinEnergy <= DBL_MIN) return res;
204  else if(A < 1.5) return kinEnergy*kinEnergy;
205
206  G4double elog = std::log10(kinEnergy/GeV);
207
208  // from G4ProtonInelasticCrossSection
209  G4double f1 = 8.0  - 8.0/A - 0.008*A;
210  G4double f2 = 2.34 - 5.4/A - 0.0028*A;
211
212  res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
213 
214  f1 = 5.6 - 0.016*A;
215  f2 = 1.37 + 1.37/A;
216  res *= ( 1.0 + (0.8 + 18./A - 0.002*A)/(1.0 + std::exp(f1*(elog + f2))));
217  return res; 
218}
219
220//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
221
222
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