source: trunk/source/processes/hadronic/cross_sections/src/G4BGGPionInelasticXS.cc@ 1340

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25//
26// $Id: G4BGGPionInelasticXS.cc,v 1.9 2010/10/12 06:03:49 dennis Exp $
27// GEANT4 tag $Name: hadr-cross-V09-03-12 $
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
80G4BGGPionInelasticXS::GetZandACrossSection(const G4DynamicParticle* dp,
81 G4int Z, G4int A, G4double)
82{
83 G4double cross = 0.0;
84 G4double ekin = dp->GetKineticEnergy();
85// G4int iz = G4int(Z);
86 if(Z > 92) Z = 92;
87
88 if(ekin <= fLowEnergy) {
89 cross = theCoulombFac[Z];
90 if(isPiplus) { cross *= CoulombFactor(ekin, A); }
91
92 } else if(Z == 1) {
93
94 if( A < 2) {
95 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
96 cross = fHadron->GetInelasticHadronNucleonXsc();
97 } else {
98 fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
99 cross = fHadron->GetInelasticHadronNucleonXsc();
100 fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron());
101 cross += fHadron->GetInelasticHadronNucleonXsc();
102 }
103
104 } else if(ekin > fGlauberEnergy) {
105 cross = theGlauberFac[Z]*fGlauber->GetInelasticGlauberGribov(dp, Z, A);
106
107 } else {
108 cross = fPion->GetIsoZACrossSection(dp, Z, A);
109 }
110
111 if(verboseLevel > 1)
112 G4cout << "G4BGGPionInelasticXS::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 G4BGGPionInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
125{
126 if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
127 particle = &p;
128 Initialise();
129 } else {
130 G4cout << "### G4BGGPionInelasticXS WARNING: is not applicable to "
131 << p.GetParticleName()
132 << G4endl;
133 }
134}
135
136//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
137
138void G4BGGPionInelasticXS::DumpPhysicsTable(const G4ParticleDefinition&)
139{
140 G4cout << "G4BGGPionInelasticXS:"<<G4endl;
141}
142
143//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
144
145void G4BGGPionInelasticXS::Initialise()
146{
147 if(isInitialized) return;
148 isInitialized = true;
149
150 fPion = new G4UPiNuclearCrossSection();
151 fGlauber = new G4GlauberGribovCrossSection();
152 fHadron = new G4HadronNucleonXsc();
153 fPion->BuildPhysicsTable(*particle);
154 fGlauber->BuildPhysicsTable(*particle);
155 if(particle == G4PionPlus::PionPlus()) isPiplus = 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
163 G4double csup, csdn;
164 G4int A;
165
166 if(verboseLevel > 0) G4cout << "### G4BGGPionInelasticXS::Initialise for "
167 << particle->GetParticleName()
168 << " isPiplus: " << isPiplus
169 << G4endl;
170
171 for(G4int iz=2; iz<93; iz++) {
172
173 G4double Z = G4double(iz);
174 A = G4lrint(nist->GetAtomicMassAmu(iz));
175
176 csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, A);
177 csdn = fPion->GetInelasticCrossSection(&dp, iz, A);
178
179 theGlauberFac[iz] = csdn/csup;
180 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
181 << " factor= " << theGlauberFac[iz] << G4endl;
182 }
183 dp.SetKineticEnergy(fLowEnergy);
184 fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton());
185 theCoulombFac[1] = fHadron->GetInelasticHadronNucleonXsc();
186 if(isPiplus) { theCoulombFac[1] /= CoulombFactor(fLowEnergy,1); }
187
188 for(G4int iz=2; iz<93; iz++) {
189
190 G4double Z = G4double(iz);
191 A = G4lrint(nist->GetAtomicMassAmu(iz));
192
193 theCoulombFac[iz] = fPion->GetIsoZACrossSection(&dp, iz, A);
194 if(isPiplus) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy,A); }
195
196 if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
197 << " factor= " << theCoulombFac[iz] << G4endl;
198 }
199}
200
201
202G4double G4BGGPionInelasticXS::CoulombFactor(G4double kinEnergy, G4int A)
203{
204 G4double res= 0.0;
205 if(kinEnergy <= DBL_MIN) return res;
206 else if(A < 2) return kinEnergy*kinEnergy;
207
208 G4double elog = std::log10(kinEnergy/GeV);
209 G4double aa = A;
210
211 // from G4ProtonInelasticCrossSection
212 G4double f1 = 8.0 - 8.0/aa - 0.008*aa;
213 G4double f2 = 2.34 - 5.4/aa - 0.0028*aa;
214
215 res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
216
217 f1 = 5.6 - 0.016*aa;
218 f2 = 1.37 + 1.37/aa;
219 res *= ( 1.0 + (0.8 + 18./aa - 0.002*aa)/(1.0 + std::exp(f1*(elog + f2))));
220 return res;
221}
222
223
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