Gabriele Cosmo
282 lines
9.5 KiB
C++
282 lines
9.5 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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// -------------------------------------------------------------------
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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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//
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// -------------------------------------------------------------------
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//
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#include "G4BGGNucleonElasticXS.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4ComponentGGHadronNucleusXsc.hh"
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#include "G4NucleonNuclearCrossSection.hh"
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#include "G4HadronNucleonXsc.hh"
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#include "G4NuclearRadii.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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#include "G4NuclearRadii.hh"
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#include "G4CrossSectionDataSetRegistry.hh"
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G4double G4BGGNucleonElasticXS::theGlauberFacP[93] = {0.0};
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G4double G4BGGNucleonElasticXS::theCoulombFacP[93] = {0.0};
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G4double G4BGGNucleonElasticXS::theGlauberFacN[93] = {0.0};
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G4double G4BGGNucleonElasticXS::theCoulombFacN[93] = {0.0};
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G4int G4BGGNucleonElasticXS::theA[93] = {0};
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#ifdef G4MULTITHREADED
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G4Mutex G4BGGNucleonElasticXS::nucleonElasticXSMutex = G4MUTEX_INITIALIZER;
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#endif
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G4BGGNucleonElasticXS::G4BGGNucleonElasticXS(const G4ParticleDefinition* p)
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: G4VCrossSectionDataSet("BarashenkovGlauberGribov")
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{
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verboseLevel = 0;
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fGlauberEnergy = 91.*GeV;
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fLowEnergy = 14.0*MeV;
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fNucleon = nullptr;
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fGlauber = nullptr;
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fHadron = nullptr;
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theProton= G4Proton::Proton();
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isProton = (theProton == p);
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isMaster = false;
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SetForAllAtomsAndEnergies(true);
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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 fHadron;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4bool
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G4BGGNucleonElasticXS::IsElementApplicable(const G4DynamicParticle*, G4int,
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const G4Material*)
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{
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return true;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4bool G4BGGNucleonElasticXS::IsIsoApplicable(const G4DynamicParticle*,
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G4int Z, G4int,
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const G4Element*,
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const G4Material*)
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{
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return (1 == Z);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double
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G4BGGNucleonElasticXS::GetElementCrossSection(const G4DynamicParticle* dp,
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G4int ZZ, const G4Material*)
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{
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// this method should be called only for Z > 1
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G4double cross = 0.0;
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G4int Z = std::min(ZZ, 92);
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G4double ekin = dp->GetKineticEnergy();
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if(1 == Z) {
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cross = 1.0115*GetIsoCrossSection(dp,1,1);
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} else {
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if(ekin <= fLowEnergy) {
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cross = (isProton) ? theCoulombFacP[Z] : theCoulombFacN[Z];
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cross *= CoulombFactor(ekin, Z);
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} else if(ekin > fGlauberEnergy) {
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cross = (isProton) ? theGlauberFacP[Z] : theGlauberFacN[Z];
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cross *= fGlauber->GetElasticGlauberGribov(dp, Z, theA[Z]);
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} else {
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cross = fNucleon->GetElasticCrossSection(dp, Z);
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}
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}
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if(verboseLevel > 1) {
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G4cout << "G4BGGNucleonElasticXS::GetElementCrossSection for "
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<< dp->GetDefinition()->GetParticleName()
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<< " Ekin(GeV)= " << dp->GetKineticEnergy()/CLHEP::GeV
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<< " in nucleus Z= " << Z << " A= " << theA[Z]
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<< " XS(b)= " << cross/barn
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<< G4endl;
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}
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double
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G4BGGNucleonElasticXS::GetIsoCrossSection(const G4DynamicParticle* dp,
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G4int Z, G4int A,
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const G4Isotope*,
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const G4Element*,
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const G4Material*)
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{
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// this method should be called only for Z = 1
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fHadron->HadronNucleonXscNS(dp->GetDefinition(), theProton,
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dp->GetKineticEnergy());
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G4double cross = A*fHadron->GetElasticHadronNucleonXsc();
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if(verboseLevel > 1) {
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G4cout << "G4BGGNucleonElasticXS::GetIsoCrossSection for "
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<< dp->GetDefinition()->GetParticleName()
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<< " Ekin(GeV)= " << dp->GetKineticEnergy()/CLHEP::GeV
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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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}
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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(fNucleon) { return; }
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if(&p == theProton || &p == G4Neutron::Neutron()) {
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isProton = (theProton == &p);
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} else {
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G4ExceptionDescription ed;
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ed << "This BGG cross section is applicable only to nucleons and not to "
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<< p.GetParticleName() << G4endl;
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G4Exception("G4BGGNucleonElasticXS::BuildPhysicsTable", "had001",
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FatalException, ed);
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return;
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}
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fNucleon = new G4NucleonNuclearCrossSection();
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fGlauber = new G4ComponentGGHadronNucleusXsc();
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fHadron = new G4HadronNucleonXsc();
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fNucleon->BuildPhysicsTable(p);
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if(0 == theA[0]) {
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#ifdef G4MULTITHREADED
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G4MUTEXLOCK(&nucleonElasticXSMutex);
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if(0 == theA[0]) {
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#endif
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isMaster = true;
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#ifdef G4MULTITHREADED
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}
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G4MUTEXUNLOCK(&nucleonElasticXSMutex);
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#endif
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} else {
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return;
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}
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if(isMaster && 0 == theA[0]) {
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theA[0] = theA[1] = 1;
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G4ThreeVector mom(0.0,0.0,1.0);
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G4DynamicParticle dp(theProton, mom, fGlauberEnergy);
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G4NistManager* nist = G4NistManager::Instance();
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G4double csup, csdn;
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if(verboseLevel > 0) {
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G4cout << "### G4BGGNucleonElasticXS::Initialise for "
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<< p.GetParticleName() << G4endl;
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}
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for(G4int iz=2; iz<93; ++iz) {
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G4int A = G4lrint(nist->GetAtomicMassAmu(iz));
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theA[iz] = A;
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csup = fGlauber->GetElasticGlauberGribov(&dp, iz, A);
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csdn = fNucleon->GetElasticCrossSection(&dp, iz);
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theGlauberFacP[iz] = csdn/csup;
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}
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dp.SetDefinition(G4Neutron::Neutron());
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for(G4int iz=2; iz<93; ++iz) {
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csup = fGlauber->GetElasticGlauberGribov(&dp, iz, theA[iz]);
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csdn = fNucleon->GetElasticCrossSection(&dp, iz);
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theGlauberFacN[iz] = csdn/csup;
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if(verboseLevel > 0) {
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G4cout << "Z= " << iz << " A= " << theA[iz]
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<< " GFactorP= " << theGlauberFacP[iz]
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<< " GFactorN= " << theGlauberFacN[iz] << G4endl;
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}
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}
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theCoulombFacP[0] = theCoulombFacP[1] =
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theCoulombFacN[0] = theCoulombFacN[1] = 1.0;
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dp.SetDefinition(theProton);
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dp.SetKineticEnergy(fLowEnergy);
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for(G4int iz=2; iz<93; ++iz) {
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theCoulombFacP[iz] = fNucleon->GetElasticCrossSection(&dp, iz)
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/CoulombFactor(fLowEnergy, iz);
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}
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dp.SetDefinition(G4Neutron::Neutron());
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for(G4int iz=2; iz<93; ++iz) {
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theCoulombFacN[iz] = fNucleon->GetElasticCrossSection(&dp, iz)
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/CoulombFactor(fLowEnergy, iz);
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if(verboseLevel > 0) {
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G4cout << "Z= " << iz << " A= " << theA[iz]
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<< " CFactorP= " << theCoulombFacP[iz]
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<< " CFactorN= " << theCoulombFacN[iz] << G4endl;
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}
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}
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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, G4int Z)
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{
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G4double res= 1.0;
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if(isProton) {
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res = G4NuclearRadii::CoulombFactor(Z, theA[Z], theProton, kinEnergy);
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}
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return res;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4BGGNucleonElasticXS::CrossSectionDescription(std::ostream& outFile) const
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{
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outFile << "The Barashenkov-Glauber-Gribov cross section handles elastic\n"
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<< "scattering of protons and neutrons from nuclei using the\n"
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<< "Barashenkov parameterization below 91 GeV and the Glauber-Gribov\n"
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<< "parameterization above 91 GeV. n";
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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