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 | #include "G4GammaAnnCrossSection.hh" |
---|
27 | #include "G4Gamma.hh" |
---|
28 | |
---|
29 | G4GammaAnnCrossSection:: |
---|
30 | G4GammaAnnCrossSection() |
---|
31 | { |
---|
32 | // pho0 Nucleon |
---|
33 | theGammaNucXSections.push_back(new G4ASCCrossSection(113, 2212, 13.7, 35.9, 0.45, 0.079)); |
---|
34 | // omega0 Nucleon |
---|
35 | theGammaNucXSections.push_back(new G4ASCCrossSection(223, 2212, 13.7, 35.9, 0.45, 0.079)); |
---|
36 | // phi0 Nucleon |
---|
37 | theGammaNucXSections.push_back(new G4ASCCrossSection(333, 2212, 12.2, 26.4, 0.50, 0.079)); |
---|
38 | } |
---|
39 | |
---|
40 | G4bool G4GammaAnnCrossSection:: |
---|
41 | InCharge(G4int aCode, G4int bCode) |
---|
42 | { |
---|
43 | G4bool result = false; |
---|
44 | if(aCode==G4Gamma::Gamma()->GetPDGEncoding()) |
---|
45 | { |
---|
46 | result=true; |
---|
47 | } |
---|
48 | else if(bCode==G4Gamma::Gamma()->GetPDGEncoding()) |
---|
49 | { |
---|
50 | result = true; |
---|
51 | } |
---|
52 | return result; |
---|
53 | } |
---|
54 | |
---|
55 | G4double G4GammaAnnCrossSection:: |
---|
56 | GetXsec(G4double s) |
---|
57 | { |
---|
58 | G4double result = 0; |
---|
59 | // ratios from Phys.Lett.B40:121-126,1972; 22% assigned to higher resonances |
---|
60 | |
---|
61 | typedef std::vector<G4ASCCrossSection*>::iterator iter; |
---|
62 | iter i; |
---|
63 | for(i=theGammaNucXSections.begin(); i!=theGammaNucXSections.end(); i++) |
---|
64 | { |
---|
65 | result += (*i)->GetXsec(s); |
---|
66 | } |
---|
67 | |
---|
68 | // Account for higher resonances. |
---|
69 | result /= 0.78; |
---|
70 | |
---|
71 | return result; |
---|
72 | } |
---|