| 1 | // |
|---|
| 2 | // ******************************************************************** |
|---|
| 3 | // * License and Disclaimer * |
|---|
| 4 | // * * |
|---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
|---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
|---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
|---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
|---|
| 9 | // * include a list of copyright holders. * |
|---|
| 10 | // * * |
|---|
| 11 | // * Neither the authors of this software system, nor their employing * |
|---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
|---|
| 13 | // * work make any representation or warranty, express or implied, * |
|---|
| 14 | // * regarding this software system or assume any liability for its * |
|---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
|---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
|---|
| 17 | // * * |
|---|
| 18 | // * This code implementation is the result of the scientific and * |
|---|
| 19 | // * technical work of the GEANT4 collaboration. * |
|---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
|---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
|---|
| 22 | // * use in resulting scientific publications, and indicate your * |
|---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
|---|
| 24 | // ******************************************************************** |
|---|
| 25 | // |
|---|
| 26 | // $Id: G4CHIPSElastic.cc,v 1.3 2009/10/08 18:56:57 vnivanch Exp $ |
|---|
| 27 | // GEANT4 tag $Name: geant4-09-03 $ |
|---|
| 28 | // |
|---|
| 29 | //--------------------------------------------------------------------- |
|---|
| 30 | // |
|---|
| 31 | // Geant4 Class : G4CHIPSElastic |
|---|
| 32 | // |
|---|
| 33 | // Author : V.Ivanchenko 29 June 2009 |
|---|
| 34 | // |
|---|
| 35 | // Modified: |
|---|
| 36 | // |
|---|
| 37 | //--------------------------------------------------------------------- |
|---|
| 38 | // CHIPS model of hadron elastic scattering |
|---|
| 39 | // |
|---|
| 40 | |
|---|
| 41 | #include "G4CHIPSElastic.hh" |
|---|
| 42 | #include "G4VQCrossSection.hh" |
|---|
| 43 | #include "G4ParticleDefinition.hh" |
|---|
| 44 | #include "G4QElasticCrossSection.hh" |
|---|
| 45 | |
|---|
| 46 | G4VQCrossSection* G4CHIPSElastic::xsManager = 0; |
|---|
| 47 | |
|---|
| 48 | G4CHIPSElastic::G4CHIPSElastic() : G4VHadronElastic("hElasticCHIPS") |
|---|
| 49 | { |
|---|
| 50 | if(!xsManager) {xsManager = G4QElasticCrossSection::GetPointer();} |
|---|
| 51 | } |
|---|
| 52 | |
|---|
| 53 | G4CHIPSElastic::~G4CHIPSElastic() |
|---|
| 54 | {} |
|---|
| 55 | |
|---|
| 56 | G4double |
|---|
| 57 | G4CHIPSElastic::SampleInvariantT(const G4ParticleDefinition* p, |
|---|
| 58 | G4double plab, G4int Z, G4int A) |
|---|
| 59 | { |
|---|
| 60 | G4int N = A - Z; |
|---|
| 61 | if(Z == 1 && N == 2) N = 1; |
|---|
| 62 | else if(Z == 2 && N == 1) N = 2; |
|---|
| 63 | G4int projPDG = p->GetPDGEncoding(); |
|---|
| 64 | G4double cs = xsManager->GetCrossSection(false,plab,Z,N,projPDG); |
|---|
| 65 | G4double t = 0.0; |
|---|
| 66 | if(cs > 0.0) t = xsManager->GetExchangeT(Z,N,projPDG); |
|---|
| 67 | else t = G4VHadronElastic::SampleInvariantT(p, plab, Z, A); |
|---|
| 68 | return t; |
|---|
| 69 | } |
|---|
| 70 | |
|---|
