| 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 | // $Id: G4CHIPSElastic.cc,v 1.3 2009/10/08 18:56:57 vnivanch Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| 28 | //
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| 29 | //---------------------------------------------------------------------
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| 30 | //
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| 31 | // Geant4 Class : G4CHIPSElastic
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| 32 | //
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| 33 | // Author : V.Ivanchenko 29 June 2009
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| 34 | //
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| 35 | // Modified:
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| 36 | //
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| 37 | //---------------------------------------------------------------------
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| 38 | // CHIPS model of hadron elastic scattering
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| 39 | //
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| 40 |
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| 41 | #include "G4CHIPSElastic.hh"
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| 42 | #include "G4VQCrossSection.hh"
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| 43 | #include "G4ParticleDefinition.hh"
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| 44 | #include "G4QElasticCrossSection.hh"
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| 45 |
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| 46 | G4VQCrossSection* G4CHIPSElastic::xsManager = 0;
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| 47 |
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| 48 | G4CHIPSElastic::G4CHIPSElastic() : G4VHadronElastic("hElasticCHIPS")
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| 49 | {
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| 50 | if(!xsManager) {xsManager = G4QElasticCrossSection::GetPointer();}
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| 51 | }
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| 52 |
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| 53 | G4CHIPSElastic::~G4CHIPSElastic()
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| 54 | {}
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| 55 |
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| 56 | G4double
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| 57 | G4CHIPSElastic::SampleInvariantT(const G4ParticleDefinition* p,
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| 58 | G4double plab, G4int Z, G4int A)
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| 59 | {
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| 60 | G4int N = A - Z;
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| 61 | if(Z == 1 && N == 2) N = 1;
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| 62 | else if(Z == 2 && N == 1) N = 2;
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| 63 | G4int projPDG = p->GetPDGEncoding();
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| 64 | G4double cs = xsManager->GetCrossSection(false,plab,Z,N,projPDG);
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| 65 | G4double t = 0.0;
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| 66 | if(cs > 0.0) t = xsManager->GetExchangeT(Z,N,projPDG);
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| 67 | else t = G4VHadronElastic::SampleInvariantT(p, plab, Z, A);
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| 68 | return t;
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| 69 | }
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| 70 |
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