source: trunk/source/processes/hadronic/cross_sections/src/G4BGGNucleonInelasticXS.cc @ 962

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

update processes
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26// $Id: G4BGGNucleonInelasticXS.cc,v 1.3 2008/12/01 16:50:23 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-02-ref-02 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name:     G4BGGNucleonInelasticXS
35//
36// Author:        Vladimir Ivanchenko
37//
38// Creation date: 13.03.2007
39// Modifications:
40//
41//
42// -------------------------------------------------------------------
43//
44
45#include "G4BGGNucleonInelasticXS.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
55G4BGGNucleonInelasticXS::G4BGGNucleonInelasticXS(const G4ParticleDefinition* p) 
56{
57  verboseLevel = 0;
58  fGlauberEnergy = 91.*GeV;
59  fLowEnergy = 20.*MeV;
60  fNucleon = 0;
61  fGlauber = 0;
62  fHadron  = 0;
63  particle = p;
64  isProton = false;
65  isInitialized = false;
66}
67
68//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70G4BGGNucleonInelasticXS::~G4BGGNucleonInelasticXS()
71{
72  delete fGlauber;
73  delete fNucleon;
74  delete fHadron;
75}
76
77//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78
79G4double G4BGGNucleonInelasticXS::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]*CoulombFactor(ekin, A);
91  } else if(iz == 1) {
92    if( A < 1.5) {
93      //fHadron->GetHadronNucleonXscPDG(dp, G4Proton::Proton());
94      //fHadron->GetHadronNucleonXscEL(dp, G4Proton::Proton());
95      //fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
96      //fHadron->GetHadronNucleonXscVU(dp, G4Proton::Proton());
97      fHadron->GetHadronNucleonXscMK(dp, G4Proton::Proton());
98      cross = fHadron->GetInelasticHadronNucleonXsc();
99    } else {
100      fHadron->GetHadronNucleonXscMK(dp, G4Proton::Proton());
101      cross = fHadron->GetInelasticHadronNucleonXsc();
102      fHadron->GetHadronNucleonXscMK(dp, G4Neutron::Neutron());
103      cross += fHadron->GetInelasticHadronNucleonXsc();
104    }
105  } else if(ekin > fGlauberEnergy) {
106    cross = theGlauberFac[iz]*fGlauber->GetInelasticGlauberGribov(dp, Z, A);
107  } else {
108    cross = fNucleon->GetIsoZACrossSection(dp, Z, A);
109  }
110
111  if(verboseLevel > 1) 
112    G4cout << "G4BGGNucleonInelasticXS::GetCrossSection  for "
113           << dp->GetDefinition()->GetParticleName()
114           << "  Ekin(GeV)= " << dp->GetKineticEnergy()
115           << " in nucleus Z= " << Z << "  A= " << A
116           << " XS(b)= " << cross/barn
117           << G4endl;
118
119  return cross;
120}
121
122//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
123
124void G4BGGNucleonInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
125{
126  if(&p == G4Proton::Proton() || &p == G4Neutron::Neutron()) {
127    particle = &p;
128    Initialise();
129  } else {
130    G4cout << "### G4BGGNucleonInelasticXS WARNING: is not applicable to " 
131           << p.GetParticleName()
132           << G4endl;
133  }
134}
135
136//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
137
138void G4BGGNucleonInelasticXS::DumpPhysicsTable(const G4ParticleDefinition&) 
139{
140  G4cout << "G4BGGNucleonInelasticXS:"<<G4endl;
141}
142
143//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
144
145void G4BGGNucleonInelasticXS::Initialise() 
146{
147  if(isInitialized) return;
148  isInitialized = true;
149
150  fNucleon = new G4NucleonNuclearCrossSection();
151  fGlauber = new G4GlauberGribovCrossSection();
152  fHadron  = new G4HadronNucleonXsc();
153  fNucleon->BuildPhysicsTable(*particle);
154  fGlauber->BuildPhysicsTable(*particle);
155  if(particle == G4Proton::Proton()) isProton = true;
156
157  G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
158  G4ThreeVector mom(0.0,0.0,1.0);
159  G4DynamicParticle dp(part, mom, fGlauberEnergy);
160
161  G4NistManager* nist = G4NistManager::Instance();
162  G4double A = nist->GetAtomicMassAmu(2);
163
164  G4double csup, csdn;
165
166  if(verboseLevel > 0) G4cout << "### G4BGGNucleonInelasticXS::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->GetInelasticGlauberGribov(&dp, Z, A);
175    csdn = fNucleon->GetIsoZACrossSection(&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] = 
184    fHadron->GetInelasticHadronNucleonXsc()/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] = 
192      fNucleon->GetIsoZACrossSection(&dp, Z, A)/CoulombFactor(fLowEnergy,A);
193
194    if(verboseLevel > 0) G4cout << "Z= " << Z <<  "  A= " << A
195                                << " factor= " << theCoulombFac[iz] << G4endl; 
196  }
197}
198
199//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
200
201G4double G4BGGNucleonInelasticXS::CoulombFactor(G4double kinEnergy, G4double A)
202{
203  G4double res= 0.0;
204  if(kinEnergy <= DBL_MIN) return res;
205  else if (A < 1.5) return kinEnergy*kinEnergy;
206 
207  G4double elog = std::log10(kinEnergy/GeV);
208
209  // from G4ProtonInelasticCrossSection
210  if(isProton) {
211    G4double f1 = 8.0  - 8.0/A - 0.008*A;
212    G4double f2 = 2.34 - 5.4/A - 0.0028*A;
213
214    res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
215 
216    f1 = 5.6 - 0.016*A;
217    f2 = 1.37 + 1.37/A;
218    res *= ( 1.0 + (0.8 + 18./A - 0.002*A)/(1.0 + std::exp(f1*(elog + f2))));
219  } else {
220
221    G4double p3 = 0.6 + 13./A - 0.0005*A;
222    G4double p4 = 7.2449 - 0.018242*A;
223    G4double p5 = 1.36 + 1.8/A + 0.0005*A;
224    G4double p6 = 1. + 200./A + 0.02*A;
225    G4double p7 = 3.0 - (A-70.)*(A-200.)/11000.;
226
227    res = (1.+p3/(1. + std::exp(p4*(elog+p5))))/(1.+std::exp(-p6*(elog+p7)));
228
229  }
230  return res; 
231}
232
233//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
234
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