source: trunk/source/processes/hadronic/cross_sections/src/G4BGGPionInelasticXS.cc@ 962

Last change on this file since 962 was 962, checked in by garnier, 17 years ago

update processes
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25//
26// $Id: G4BGGPionInelasticXS.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: G4BGGPionInelasticXS
35//
36// Author: Vladimir Ivanchenko
37//
38// Creation date: 01.10.2003
39// Modifications:
40//
41//
42// -------------------------------------------------------------------
43//
44
45#include "G4BGGPionInelasticXS.hh"
46#include "G4GlauberGribovCrossSection.hh"
47#include "G4UPiNuclearCrossSection.hh"
48#include "G4HadronNucleonXsc.hh"
49#include "G4PionPlus.hh"
50#include "G4PionMinus.hh"
51#include "G4NistManager.hh"
52
53//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54
55G4BGGPionInelasticXS::G4BGGPionInelasticXS(const G4ParticleDefinition* p)
56{
57 verboseLevel = 0;
58 fGlauberEnergy = 91.*GeV;
59 fLowEnergy = 20.*MeV;
60 fPion = 0;
61 fGlauber = 0;
62 fHadron = 0;
63 particle = p;
64 isPiplus = false;
65 isInitialized = false;
66}
67
68//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70G4BGGPionInelasticXS::~G4BGGPionInelasticXS()
71{
72 delete fGlauber;
73 delete fPion;
74 delete fHadron;
75}
76
77//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78
79G4double G4BGGPionInelasticXS::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(isPiplus) { cross *= CoulombFactor(ekin, A); }
92
93 } else if(iz == 1) {
94
95 if( A < 1.5) {
96 //fHadron->GetHadronNucleonXscPDG(dp, G4Proton::Proton());
97 //fHadron->GetHadronNucleonXscEL(dp, G4Proton::Proton());
98 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
99 //fHadron->GetHadronNucleonXscVU(dp, G4Proton::Proton());
100 //fHadron->GetHadronNucleonXscMK(dp, G4Proton::Proton());
101 cross = fHadron->GetInelasticHadronNucleonXsc();
102 } else {
103 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
104 cross = fHadron->GetInelasticHadronNucleonXsc();
105 fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron());
106 cross += fHadron->GetInelasticHadronNucleonXsc();
107 }
108
109 } else if(ekin > fGlauberEnergy) {
110 cross = theGlauberFac[iz]*fGlauber->GetInelasticGlauberGribov(dp, Z, A);
111
112 } else {
113 cross = fPion->GetIsoZACrossSection(dp, Z, A);
114 }
115
116 if(verboseLevel > 1)
117 G4cout << "G4BGGPionInelasticXS::GetCrossSection for "
118 << dp->GetDefinition()->GetParticleName()
119 << " Ekin(GeV)= " << dp->GetKineticEnergy()
120 << " in nucleus Z= " << Z << " A= " << A
121 << " XS(b)= " << cross/barn
122 << G4endl;
123
124 return cross;
125}
126
127//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
128
129void G4BGGPionInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
130{
131 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
132 particle = &p;
133 Initialise();
134 } else {
135 G4cout << "### G4BGGPionInelasticXS WARNING: is not applicable to "
136 << p.GetParticleName()
137 << G4endl;
138 }
139}
140
141//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
142
143void G4BGGPionInelasticXS::DumpPhysicsTable(const G4ParticleDefinition&)
144{
145 G4cout << "G4BGGPionInelasticXS:"<<G4endl;
146}
147
148//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
149
150void G4BGGPionInelasticXS::Initialise()
151{
152 if(isInitialized) return;
153 isInitialized = true;
154
155 fPion = new G4UPiNuclearCrossSection();
156 fGlauber = new G4GlauberGribovCrossSection();
157 fHadron = new G4HadronNucleonXsc();
158 fPion->BuildPhysicsTable(*particle);
159 fGlauber->BuildPhysicsTable(*particle);
160 if(particle == G4PionPlus::PionPlus()) isPiplus = true;
161
162 G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
163 G4ThreeVector mom(0.0,0.0,1.0);
164 G4DynamicParticle dp(part, mom, fGlauberEnergy);
165
166 G4NistManager* nist = G4NistManager::Instance();
167
168 G4double A, csup, csdn;
169
170 if(verboseLevel > 0) G4cout << "### G4BGGPionInelasticXS::Initialise for "
171 << particle->GetParticleName()
172 << " isPiplus: " << isPiplus
173 << G4endl;
174
175 for(G4int iz=2; iz<93; iz++) {
176
177 G4double Z = G4double(iz);
178 A = nist->GetAtomicMassAmu(iz);
179
180 csup = fGlauber->GetInelasticGlauberGribov(&dp, Z, A);
181 csdn = fPion->GetInelasticCrossSection(&dp, Z, A);
182
183 theGlauberFac[iz] = csdn/csup;
184 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
185 << " factor= " << theGlauberFac[iz] << G4endl;
186 }
187 dp.SetKineticEnergy(fLowEnergy);
188 fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton());
189 theCoulombFac[1] = fHadron->GetInelasticHadronNucleonXsc();
190 if(isPiplus) { theCoulombFac[1] /= CoulombFactor(fLowEnergy,1.0); }
191
192 for(G4int iz=2; iz<93; iz++) {
193
194 G4double Z = G4double(iz);
195 A = nist->GetAtomicMassAmu(iz);
196
197 theCoulombFac[iz] = fPion->GetIsoZACrossSection(&dp, Z, A);
198 if(isPiplus) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy,A); }
199
200 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
201 << " factor= " << theCoulombFac[iz] << G4endl;
202 }
203}
204
205//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
206
207G4double G4BGGPionInelasticXS::CoulombFactor(G4double kinEnergy, G4double A)
208{
209 G4double res= 0.0;
210 if(kinEnergy <= DBL_MIN) return res;
211 else if(A < 1.5) return kinEnergy*kinEnergy;
212
213 G4double elog = std::log10(kinEnergy/GeV);
214
215 // from G4ProtonInelasticCrossSection
216 G4double f1 = 8.0 - 8.0/A - 0.008*A;
217 G4double f2 = 2.34 - 5.4/A - 0.0028*A;
218
219 res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
220
221 f1 = 5.6 - 0.016*A;
222 f2 = 1.37 + 1.37/A;
223 res *= ( 1.0 + (0.8 + 18./A - 0.002*A)/(1.0 + std::exp(f1*(elog + f2))));
224 return res;
225}
226
227//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
228
229
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