source: trunk/source/processes/hadronic/cross_sections/src/G4BGGNucleonElasticXS.cc@ 1036

Last change on this file since 1036 was 1007, checked in by garnier, 17 years ago

update to geant4.9.2
File size: 7.3 KB
Line 
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25//
26// $Id: G4BGGNucleonElasticXS.cc,v 1.3 2008/12/01 16:50:23 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-02 $
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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