Gabriele Cosmo
123 lines
3.8 KiB
C++
123 lines
3.8 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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#include "globals.hh"
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#include "G4ios.hh"
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#include "G4XMesonBaryonElastic.hh"
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#include "G4KineticTrack.hh"
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#include "G4Gamma.hh"
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#include "G4PionPlus.hh"
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#include "G4Proton.hh"
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#include "G4XAqmElastic.hh"
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#include "G4XPDGElastic.hh"
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G4XMesonBaryonElastic::G4XMesonBaryonElastic()
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{
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// As a first approximation the model is assumed to be valid over
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// the entire energy range
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lowLimit = 0.;
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highLimit = DBL_MAX;
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}
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G4XMesonBaryonElastic::~G4XMesonBaryonElastic()
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{ }
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G4bool G4XMesonBaryonElastic::operator==(const G4XMesonBaryonElastic &right) const
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{
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return (this == (G4XMesonBaryonElastic *) &right);
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}
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G4bool G4XMesonBaryonElastic::operator!=(const G4XMesonBaryonElastic &right) const
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{
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return (this != (G4XMesonBaryonElastic *) &right);
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}
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G4double G4XMesonBaryonElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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{
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G4double sigma;
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// No gamma-baryon elastic scattering
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const G4ParticleDefinition* defLight = FindLightParticle(trk1,trk2);
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if (defLight == G4Gamma::GammaDefinition())
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{
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sigma = 0;
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}
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else
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{
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G4LorentzVector p41 = trk1.Get4Momentum();
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G4ThreeVector p3 = trk1.GetPosition();
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G4ParticleDefinition* def = G4PionPlus::PionPlusDefinition();
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G4KineticTrack piTrk(def,
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trk1.GetFormationTime(),
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p3,
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(G4LorentzVector&)p41);
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G4LorentzVector p42 = trk2.Get4Momentum();
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G4KineticTrack pTrk(((G4ParticleDefinition*)G4Proton::ProtonDefinition()),
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trk2.GetFormationTime(),
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(G4ThreeVector)trk2.GetPosition(),
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(G4LorentzVector&)p42);
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G4XAqmElastic aqm;
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G4double xAqmDummy = aqm.CrossSection(piTrk,pTrk);
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G4double xAqm = aqm.CrossSection(trk1,trk2);
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G4double factor = 1.;
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if (xAqmDummy != 0.0)
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{
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factor = xAqm / xAqmDummy;
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}
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G4XPDGElastic pdg;
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sigma = pdg.CrossSection(piTrk,pTrk);
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sigma = sigma * factor;
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}
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return sigma;
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}
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G4String G4XMesonBaryonElastic::Name() const
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{
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G4String name("MesonBaryonElasticCrossSection");
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return name;
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}
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G4bool G4XMesonBaryonElastic::IsValid(G4double e) const
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{
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G4bool answer = InLimits(e,lowLimit,highLimit);
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return answer;
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}
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