source: trunk/source/processes/hadronic/cross_sections/src/G4BGGPionElasticXS.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: G4BGGPionElasticXS.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: G4BGGPionElasticXS
35//
36// Author: Vladimir Ivanchenko
37//
38// Creation date: 01.10.2003
39// Modifications:
40//
41//
42// -------------------------------------------------------------------
43//
44
45#include "G4BGGPionElasticXS.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
55G4BGGPionElasticXS::G4BGGPionElasticXS(const G4ParticleDefinition*)
56{
57 verboseLevel = 0;
58 fGlauberEnergy = 91.*GeV;
59 fLowEnergy = 20.*MeV;
60 fPion = 0;
61 fGlauber = 0;
62 fHadron = 0;
63 particle = 0;
64 isPiplus = false;
65 isInitialized = false;
66}
67
68//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70G4BGGPionElasticXS::~G4BGGPionElasticXS()
71{
72 delete fGlauber;
73 delete fPion;
74 delete fHadron;
75}
76
77//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78
79G4double G4BGGPionElasticXS::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 if( A < 1.5) {
95 //fHadron->GetHadronNucleonXscPDG(dp, G4Proton::Proton());
96 //fHadron->GetHadronNucleonXscEL(dp, G4Proton::Proton());
97 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
98 //fHadron->GetHadronNucleonXscVU(dp, G4Proton::Proton());
99 //fHadron->GetHadronNucleonXscMK(dp, G4Proton::Proton());
100 cross = fHadron->GetElasticHadronNucleonXsc();
101 } else {
102 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
103 cross = fHadron->GetElasticHadronNucleonXsc();
104 fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron());
105 cross += fHadron->GetElasticHadronNucleonXsc();
106 }
107 } else if(ekin > fGlauberEnergy) {
108 cross = theGlauberFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
109 } else {
110 cross = fPion->GetElasticCrossSection(dp, Z, A);
111 }
112
113 if(verboseLevel > 1)
114 G4cout << "G4BGGPionElasticXS::GetCrossSection for "
115 << dp->GetDefinition()->GetParticleName()
116 << " Ekin(GeV)= " << dp->GetKineticEnergy()
117 << " in nucleus Z= " << Z << " A= " << A
118 << " XS(b)= " << cross/barn
119 << G4endl;
120
121 return cross;
122}
123
124//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
125
126void G4BGGPionElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
127{
128 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
129 particle = &p;
130 Initialise();
131 } else {
132 G4cout << "### G4BGGPionElasticXS WARNING: is not applicable to "
133 << p.GetParticleName()
134 << G4endl;
135 }
136}
137
138//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
139
140void G4BGGPionElasticXS::DumpPhysicsTable(const G4ParticleDefinition&)
141{
142 G4cout << "G4BGGPionElasticXS:"<<G4endl;
143}
144
145//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
146
147void G4BGGPionElasticXS::Initialise()
148{
149 if(isInitialized) return;
150 isInitialized = true;
151
152 fPion = new G4UPiNuclearCrossSection();
153 fGlauber = new G4GlauberGribovCrossSection();
154 fHadron = new G4HadronNucleonXsc();
155 fPion->BuildPhysicsTable(*particle);
156 fGlauber->BuildPhysicsTable(*particle);
157 if(particle == G4PionPlus::PionPlus()) isPiplus = true;
158
159 G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
160 G4ThreeVector mom(0.0,0.0,1.0);
161 G4DynamicParticle dp(part, mom, fGlauberEnergy);
162
163 G4NistManager* nist = G4NistManager::Instance();
164
165 G4double A, csup, csdn;
166
167 if(verboseLevel > 0) G4cout << "### G4BGGPionElasticXS::Initialise for "
168 << particle->GetParticleName() << G4endl;
169
170 for(G4int iz=2; iz<93; iz++) {
171
172 G4double Z = G4double(iz);
173 A = nist->GetAtomicMassAmu(iz);
174
175 csup = fGlauber->GetElasticGlauberGribov(&dp, Z, A);
176 csdn = fPion->GetElasticCrossSection(&dp, Z, A);
177
178 theGlauberFac[iz] = csdn/csup;
179 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
180 << " factor= " << theGlauberFac[iz] << G4endl;
181 }
182 dp.SetKineticEnergy(fLowEnergy);
183 fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton());
184 theCoulombFac[1] = fHadron->GetElasticHadronNucleonXsc();
185 if(isPiplus) { theCoulombFac[1] /= CoulombFactor(fLowEnergy,1.0); }
186
187 for(G4int iz=2; iz<93; iz++) {
188
189 G4double Z = G4double(iz);
190 A = nist->GetAtomicMassAmu(iz);
191
192 theCoulombFac[iz] = fPion->GetElasticCrossSection(&dp, Z, A);
193 if(isPiplus) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy,A); }
194 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
195 << " factor= " << theCoulombFac[iz] << G4endl;
196 }
197}
198
199//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
200
201G4double G4BGGPionElasticXS::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 G4double f1 = 8.0 - 8.0/A - 0.008*A;
211 G4double f2 = 2.34 - 5.4/A - 0.0028*A;
212
213 res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
214
215 f1 = 5.6 - 0.016*A;
216 f2 = 1.37 + 1.37/A;
217 res *= ( 1.0 + (0.8 + 18./A - 0.002*A)/(1.0 + std::exp(f1*(elog + f2))));
218 return res;
219}
220
221//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
222
223
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