ECCE @ EIC Software
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
G4LENDGammaCrossSection.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4LENDGammaCrossSection.cc
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 //
27 // //
28 // File: G4LENDGammaCrossSection.cc //
29 // Date: 30 March 2020 //
30 // Author: Dennis H. Wright //
31 // //
32 // Description: cross sections for inelastic scattering of gammas from //
33 // nuclei including gamma-induced fission. This cross section //
34 // is very similar to G4LENDCombinedCrossSection except that //
35 // does not sample elastic or capture reactions since there are //
36 // no such data for gammas in GND. //
37 // //
39 
43 #include "Randomize.hh"
44 
45 
47  :G4LENDCrossSection("LENDGammaCrossSection")
48 {
49  proj = pd;
52 }
53 
55 {
59 }
60 
61 G4double
63  G4int iZ, G4int iA,
64  const G4Isotope* isotope,
65  const G4Element*,
66  const G4Material* material)
67 {
68  G4double XS = 0.0;
69  XS += inelasticXS->GetIsoCrossSection(dp, iZ, iA, isotope, NULL, material);
70  XS += fissionXS->GetIsoCrossSection(dp, iZ, iA, isotope, NULL, material);
71  //G4cout << "G4LENDGammaCrossSection::GetIsoCrossSection "
72  // << XS/CLHEP::barn << " [barn]" << G4endl;
73  return XS;
74 }
75 
77  G4int iZ, G4int iA,
78  const G4Isotope* isotope,
79  const G4Element*,
80  const G4Material* material)
81 {
82  G4int ichannel = -1;
83  G4double XSs[2];
84  XSs[0] = inelasticXS->GetIsoCrossSection(dp, iZ, iA, isotope, nullptr, material);
85  XSs[1] = XSs[0] + fissionXS->GetIsoCrossSection(dp, iZ, iA, isotope, nullptr, material);
86 
87  G4double total = XSs[1];
88 
89  G4double random = G4UniformRand();
90  for (G4int i = 0; i < 2; i++) {
91  if (random*total <= XSs[i]) {
92  ichannel = i;
93  break;
94  }
95  }
96 
97  return ichannel;
98 }
99