Gabriele Cosmo
220 lines
7.1 KiB
C++
220 lines
7.1 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: G4BGGNucleonElasticXS.cc,v 1.7 2009/11/19 19:40:45 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-03 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4BGGNucleonElasticXS
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 13.03.2007
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// Modifications:
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//
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//
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// -------------------------------------------------------------------
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//
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#include "G4BGGNucleonElasticXS.hh"
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#include "G4GlauberGribovCrossSection.hh"
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#include "G4NucleonNuclearCrossSection.hh"
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#include "G4HadronNucleonXsc.hh"
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#include "G4Proton.hh"
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#include "G4Neutron.hh"
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#include "G4NistManager.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4BGGNucleonElasticXS::G4BGGNucleonElasticXS(const G4ParticleDefinition*)
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{
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verboseLevel = 0;
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fGlauberEnergy = 91.*GeV;
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fLowEnergy = 20.*MeV;
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fNucleon = 0;
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fGlauber = 0;
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fHadron = 0;
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particle = 0;
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isProton = false;
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isInitialized = false;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4BGGNucleonElasticXS::~G4BGGNucleonElasticXS()
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{
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delete fGlauber;
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delete fNucleon;
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delete fHadron;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double G4BGGNucleonElasticXS::GetIsoZACrossSection(const G4DynamicParticle* dp,
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G4double Z,
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G4double A,
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G4double)
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{
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G4double cross = 0.0;
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G4double ekin = dp->GetKineticEnergy();
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G4int iz = G4int(Z);
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if(iz > 92) iz = 92;
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if(ekin <= fLowEnergy) {
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cross = theCoulombFac[iz];
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if(isProton) { cross *= CoulombFactor(ekin, A); }
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} else if(iz == 1) {
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if( A < 1.5) {
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fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
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cross = fHadron->GetElasticHadronNucleonXsc();
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} else {
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fHadron->GetHadronNucleonXscNS(dp, G4Proton::Proton());
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cross = fHadron->GetElasticHadronNucleonXsc();
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fHadron->GetHadronNucleonXscNS(dp, G4Neutron::Neutron());
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cross += fHadron->GetElasticHadronNucleonXsc();
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}
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} else if(ekin > fGlauberEnergy) {
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cross = theGlauberFac[iz]*fGlauber->GetElasticGlauberGribov(dp, Z, A);
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} else {
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cross = fNucleon->GetElasticCrossSection(dp, Z, A);
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}
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if(verboseLevel > 1)
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G4cout << "G4BGGNucleonElasticXS::GetCrossSection for "
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<< dp->GetDefinition()->GetParticleName()
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<< " Ekin(GeV)= " << dp->GetKineticEnergy()
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<< " in nucleus Z= " << Z << " A= " << A
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<< " XS(b)= " << cross/barn
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<< G4endl;
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4BGGNucleonElasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
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{
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if(&p == G4Proton::Proton() || &p == G4Neutron::Neutron()) {
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particle = &p;
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Initialise();
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} else {
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G4cout << "### G4BGGNucleonElasticXS WARNING: is not applicable to "
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<< p.GetParticleName()
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<< G4endl;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4BGGNucleonElasticXS::DumpPhysicsTable(const G4ParticleDefinition&)
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{
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G4cout << "G4BGGNucleonElasticXS:"<<G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4BGGNucleonElasticXS::Initialise()
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{
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if(isInitialized) return;
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isInitialized = true;
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fNucleon = new G4NucleonNuclearCrossSection();
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fGlauber = new G4GlauberGribovCrossSection();
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fHadron = new G4HadronNucleonXsc();
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fNucleon->BuildPhysicsTable(*particle);
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fGlauber->BuildPhysicsTable(*particle);
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if(particle == G4Proton::Proton()) isProton = true;
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G4ParticleDefinition* part = const_cast<G4ParticleDefinition*>(particle);
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G4ThreeVector mom(0.0,0.0,1.0);
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G4DynamicParticle dp(part, mom, fGlauberEnergy);
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G4NistManager* nist = G4NistManager::Instance();
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G4double A, csup, csdn;
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if(verboseLevel > 0) G4cout << "### G4BGGNucleonElasticXS::Initialise for "
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<< particle->GetParticleName() << G4endl;
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for(G4int iz=2; iz<93; iz++) {
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G4double Z = G4double(iz);
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A = nist->GetAtomicMassAmu(iz);
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csup = fGlauber->GetElasticGlauberGribov(&dp, Z, A);
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csdn = fNucleon->GetElasticCrossSection(&dp, Z, A);
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theGlauberFac[iz] = csdn/csup;
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if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
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<< " factor= " << theGlauberFac[iz] << G4endl;
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}
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dp.SetKineticEnergy(fLowEnergy);
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fHadron->GetHadronNucleonXscNS(&dp, G4Proton::Proton());
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theCoulombFac[1] = fHadron->GetElasticHadronNucleonXsc();
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if(isProton) { theCoulombFac[1] /= CoulombFactor(fLowEnergy, 1.0); }
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for(G4int iz=2; iz<93; iz++) {
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G4double Z = G4double(iz);
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A = nist->GetAtomicMassAmu(iz);
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theCoulombFac[iz] = fNucleon->GetElasticCrossSection(&dp, Z, A);
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if(isProton) { theCoulombFac[iz] /= CoulombFactor(fLowEnergy, A); }
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if(verboseLevel > 0) G4cout << "Z= " << Z << " A= " << A
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<< " factor= " << theCoulombFac[iz] << G4endl;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double G4BGGNucleonElasticXS::CoulombFactor(G4double kinEnergy, G4double A)
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{
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G4double res= 0.0;
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if(kinEnergy <= DBL_MIN) return res;
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else if(A < 1.5) return kinEnergy*kinEnergy;
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G4double elog = std::log10(kinEnergy/GeV);
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// from G4ProtonInelasticCrossSection
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G4double f1 = 8.0 - 8.0/A - 0.008*A;
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G4double f2 = 2.34 - 5.4/A - 0.0028*A;
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res = 1.0/(1.0 + std::exp(-f1*(elog + f2)));
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f1 = 5.6 - 0.016*A;
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f2 = 1.37 + 1.37/A;
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res *= ( 1.0 + (0.8 + 18./A - 0.002*A)/(1.0 + std::exp(f1*(elog + f2))));
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return res;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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