| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4CollisionNN.cc,v 1.3.2.2 2006/06/29 20:37:30 gunter Exp $ //
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| 28 |
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| 29 |
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| 30 | #include "globals.hh"
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| 31 | #include "G4CollisionNN.hh"
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| 32 | #include "G4CollisionComposite.hh"
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| 33 | #include "G4VCollision.hh"
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| 34 | #include "G4CollisionVector.hh"
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| 35 | #include "G4KineticTrack.hh"
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| 36 | #include "G4VCrossSectionSource.hh"
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| 37 | #include "G4XNNTotal.hh"
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| 38 | #include "G4Proton.hh"
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| 39 | #include "G4Neutron.hh"
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| 40 | #include "G4CollisionNNElastic.hh"
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| 41 | #include "G4CollisionnpElastic.hh"
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| 42 | #include "G4CollisionNNToNDelta.hh"
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| 43 | #include "G4CollisionNNToDeltaDelta.hh"
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| 44 | #include "G4CollisionNNToNDeltastar.hh"
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| 45 | #include "G4CollisionNNToDeltaDeltastar.hh"
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| 46 | #include "G4CollisionNNToNNstar.hh"
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| 47 | #include "G4CollisionNNToDeltaNstar.hh"
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| 48 | #include "G4Pair.hh"
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| 49 |
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| 50 | typedef GROUP8(G4CollisionnpElastic, G4CollisionNNElastic,
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| 51 | G4CollisionNNToNDelta, G4CollisionNNToDeltaDelta,
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| 52 | G4CollisionNNToNDeltastar, G4CollisionNNToDeltaDeltastar,
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| 53 | G4CollisionNNToNNstar, G4CollisionNNToDeltaNstar) theChannels;
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| 54 |
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| 55 | G4CollisionNN::G4CollisionNN()
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| 56 | {
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| 57 | crossSectionSource = new G4XNNTotal();
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| 58 | G4CollisionComposite::Register aR;
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| 59 | G4ForEach<theChannels>::Apply(&aR, this);
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| 60 | }
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| 61 |
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| 62 |
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| 63 | G4CollisionNN::~G4CollisionNN()
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| 64 | {
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| 65 | delete crossSectionSource;
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| 66 | crossSectionSource = 0;
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| 67 | }
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| 68 |
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| 69 |
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| 70 | const std::vector<G4String>& G4CollisionNN::GetListOfColliders(G4int ) const
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| 71 | {
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| 72 | throw G4HadronicException(__FILE__, __LINE__, "G4CollisionNN::GetListOfColliders - Argument outside valid range");
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| 73 | return colliders1;
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| 74 | }
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| 75 |
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| 76 |
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| 77 | G4double G4CollisionNN::CrossSection(const G4KineticTrack& aTrk1,
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| 78 | const G4KineticTrack& aTrk2) const
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| 79 | {
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| 80 | G4double sigma = 0.;
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| 81 |
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| 82 | // nucleon-nucleon cross-sections made for on-shell particles.
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| 83 | // here we take the kinetic energy as the quantity relevant
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| 84 | // for calculating the scattering cross-sections for off-shell hadrons
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| 85 |
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| 86 | const G4VCrossSectionSource* xSource = GetCrossSectionSource();
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| 87 | G4LorentzVector p1 = aTrk1.Get4Momentum();
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| 88 | G4LorentzVector p2 = aTrk2.Get4Momentum();
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| 89 | G4double t1 = p1.e()-aTrk1.GetActualMass();
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| 90 | G4double t2 = p2.e()-aTrk2.GetActualMass();
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| 91 | p1.setE(t1+aTrk1.GetDefinition()->GetPDGMass());
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| 92 | p2.setE(t2+aTrk2.GetDefinition()->GetPDGMass());
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| 93 | G4KineticTrack trk1(aTrk1);
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| 94 | trk1.Set4Momentum(p1);
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| 95 | G4KineticTrack trk2(aTrk2);
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| 96 | trk2.Set4Momentum(p2);
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| 97 | if( (p1+p2).mag()<aTrk1.GetDefinition()->GetPDGMass()+aTrk2.GetDefinition()->GetPDGMass())
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| 98 | {
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| 99 | return 0.;
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| 100 | }
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| 101 |
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| 102 | if (xSource != 0)
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| 103 | {
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| 104 | // There is a cross section for this Collision
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| 105 | sigma = xSource->CrossSection(trk1,trk2);
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| 106 | }
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| 107 | return sigma;
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| 108 | }
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| 109 |
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