source: trunk/source/processes/hadronic/cross_sections/src/G4BGGPionElasticXS.cc@ 1315

Last change on this file since 1315 was 1228, checked in by garnier, 16 years ago

update geant4.9.3 tag
File size: 7.1 KB
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1//
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15// * use. Please see the license in the file LICENSE and URL above *
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17// * *
18// * This code implementation is the result of the scientific and *
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20// * By using, copying, modifying or distributing the software (or *
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24// ********************************************************************
25//
26// $Id: G4BGGPionElasticXS.cc,v 1.7 2009/11/19 19:40:45 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03 $
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->GetHadronNucleonXscNS(dp, G4Proton::Proton());
96 cross = fHadron->GetElasticHadronNucleonXsc();
97 } else {
98 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
99 cross = fHadron->GetElasticHadronNucleonXsc();
100 fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron());
101 cross += fHadron->GetElasticHadronNucleonXsc();
102 }
103 } else if(ekin > fGlauberEnergy) {
104 cross = theGlauberFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
105 } else {
106 cross = fPion->GetElasticCrossSection(dp, Z, A);
107 }
108
109 if(verboseLevel > 1)
110 G4cout << "G4BGGPionElasticXS::GetCrossSection for "
111 << dp->GetDefinition()->GetParticleName()
112 << " Ekin(GeV)= " << dp->GetKineticEnergy()
113 << " in nucleus Z= " << Z << " A= " << A
114 << " XS(b)= " << cross/barn
115 << G4endl;
116
117 return cross;
118}
119
120//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
121
122void G4BGGPionElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
123{
124 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
125 particle = &p;
126 Initialise();
127 } else {
128 G4cout << "### G4BGGPionElasticXS WARNING: is not applicable to "
129 << p.GetParticleName()
130 << G4endl;
131 }
132}
133
134//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
135
136void G4BGGPionElasticXS::DumpPhysicsTable(const G4ParticleDefinition&)
137{
138 G4cout << "G4BGGPionElasticXS:"<<G4endl;
139}
140
141//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
142
143void G4BGGPionElasticXS::Initialise()
144{
145 if(isInitialized) return;
146 isInitialized = true;
147
148 fPion = new G4UPiNuclearCrossSection();
149 fGlauber = new G4GlauberGribovCrossSection();
150 fHadron = new G4HadronNucleonXsc();
151 fPion->BuildPhysicsTable(*particle);
152 fGlauber->BuildPhysicsTable(*particle);
153 if(particle == G4PionPlus::PionPlus()) isPiplus = true;
154
155 G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
156 G4ThreeVector mom(0.0,0.0,1.0);
157 G4DynamicParticle dp(part, mom, fGlauberEnergy);
158
159 G4NistManager* nist = G4NistManager::Instance();
160
161 G4double A, csup, csdn;
162
163 if(verboseLevel > 0) G4cout << "### G4BGGPionElasticXS::Initialise for "
164 << particle->GetParticleName() << G4endl;
165
166 for(G4int iz=2; iz<93; iz++) {
167
168 G4double Z = G4double(iz);
169 A = nist->GetAtomicMassAmu(iz);
170
171 csup = fGlauber->GetElasticGlauberGribov(&dp, Z, A);
172 csdn = fPion->GetElasticCrossSection(&dp, Z, A);
173
174 theGlauberFac[iz] = csdn/csup;
175 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
176 << " factor= " << theGlauberFac[iz] << G4endl;
177 }
178 dp.SetKineticEnergy(fLowEnergy);
179 fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton());
180 theCoulombFac[1] = fHadron->GetElasticHadronNucleonXsc();
181 if(isPiplus) { theCoulombFac[1] /= CoulombFactor(fLowEnergy,1.0); }
182
183 for(G4int iz=2; iz<93; iz++) {
184
185 G4double Z = G4double(iz);
186 A = nist->GetAtomicMassAmu(iz);
187
188 theCoulombFac[iz] = fPion->GetElasticCrossSection(&dp, Z, A);
189 if(isPiplus) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy,A); }
190 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
191 << " factor= " << theCoulombFac[iz] << G4endl;
192 }
193}
194
195//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
196
197G4double G4BGGPionElasticXS::CoulombFactor(G4double kinEnergy, G4double A)
198{
199 G4double res= 0.0;
200 if(kinEnergy <= DBL_MIN) return res;
201 else if(A < 1.5) return kinEnergy*kinEnergy;
202
203 G4double elog = std::log10(kinEnergy/GeV);
204
205 // from G4ProtonInelasticCrossSection
206 G4double f1 = 8.0 - 8.0/A - 0.008*A;
207 G4double f2 = 2.34 - 5.4/A - 0.0028*A;
208
209 res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
210
211 f1 = 5.6 - 0.016*A;
212 f2 = 1.37 + 1.37/A;
213 res *= ( 1.0 + (0.8 + 18./A - 0.002*A)/(1.0 + std::exp(f1*(elog + f2))));
214 return res;
215}
216
217//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
218
219
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