Gabriele Cosmo
115 lines
4.1 KiB
C++
115 lines
4.1 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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//
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// $Id: G4CollisionNN.cc,v 1.4 2010-03-12 15:45:18 gunter Exp $ //
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#include "globals.hh"
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#include "G4CollisionNN.hh"
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#include "G4CollisionComposite.hh"
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#include "G4VCollision.hh"
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#include "G4CollisionVector.hh"
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#include "G4KineticTrack.hh"
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#include "G4VCrossSectionSource.hh"
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#include "G4XNNTotal.hh"
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#include "G4Proton.hh"
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#include "G4Neutron.hh"
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#include "G4CollisionNNElastic.hh"
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#include "G4CollisionnpElastic.hh"
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#include "G4CollisionNNToNDelta.hh"
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#include "G4CollisionNNToDeltaDelta.hh"
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#include "G4CollisionNNToNDeltastar.hh"
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#include "G4CollisionNNToDeltaDeltastar.hh"
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#include "G4CollisionNNToNNstar.hh"
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#include "G4CollisionNNToDeltaNstar.hh"
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#include "G4Pair.hh"
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typedef GROUP8(G4CollisionnpElastic, G4CollisionNNElastic,
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G4CollisionNNToNDelta, G4CollisionNNToDeltaDelta,
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G4CollisionNNToNDeltastar, G4CollisionNNToDeltaDeltastar,
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G4CollisionNNToNNstar, G4CollisionNNToDeltaNstar) theChannels;
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G4CollisionNN::G4CollisionNN()
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{
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components=0;
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crossSectionSource = new G4XNNTotal();
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G4CollisionComposite::Register aR;
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G4ForEach<theChannels>::Apply(&aR, this);
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}
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G4CollisionNN::~G4CollisionNN()
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{
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if (components) {
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delete components;
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components=0;
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}
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delete crossSectionSource;
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crossSectionSource = 0;
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}
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const std::vector<G4String>& G4CollisionNN::GetListOfColliders(G4int ) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4CollisionNN::GetListOfColliders - Argument outside valid range");
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return colliders1;
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}
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G4double G4CollisionNN::CrossSection(const G4KineticTrack& aTrk1,
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const G4KineticTrack& aTrk2) const
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{
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G4double sigma = 0.;
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// nucleon-nucleon cross-sections made for on-shell particles.
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// here we take the kinetic energy as the quantity relevant
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// for calculating the scattering cross-sections for off-shell hadrons
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const G4VCrossSectionSource* xSource = GetCrossSectionSource();
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G4LorentzVector p1 = aTrk1.Get4Momentum();
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G4LorentzVector p2 = aTrk2.Get4Momentum();
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G4double t1 = p1.e()-aTrk1.GetActualMass();
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G4double t2 = p2.e()-aTrk2.GetActualMass();
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p1.setE(t1+aTrk1.GetDefinition()->GetPDGMass());
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p2.setE(t2+aTrk2.GetDefinition()->GetPDGMass());
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G4KineticTrack trk1(aTrk1);
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trk1.Set4Momentum(p1);
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G4KineticTrack trk2(aTrk2);
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trk2.Set4Momentum(p2);
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if( (p1+p2).mag()<aTrk1.GetDefinition()->GetPDGMass()+aTrk2.GetDefinition()->GetPDGMass())
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{
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return 0.;
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}
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if (xSource != 0)
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{
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// There is a cross section for this Collision
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sigma = xSource->CrossSection(trk1,trk2);
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}
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return sigma;
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}
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