| Geant4 Cross Reference |
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 //
27 // -------------------------------------------------------------------
28 // GEANT4 Class file
29 //
30 // For information related to this code contact:
31 //
32 // File name: G4XAqmElastic
33 //
34 // Author:
35 //
36 // Creation date: 15 April 1999
37 //
38 // Modifications:
39 //
40 // Additive Quark Model Elastic cross section
41 // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71
42 //
43 // -------------------------------------------------------------------
44
45 #include "globals.hh"
46 #include "G4ios.hh"
47 #include "G4Pow.hh"
48 #include "G4XAqmElastic.hh"
49 #include "G4XAqmTotal.hh"
50 #include "G4KineticTrack.hh"
51
52
53 // Validity range of this cross-section
54 const G4double G4XAqmElastic::_lowLimit = 0.;
55 const G4double G4XAqmElastic::_highLimit = DBL_MAX;
56
57 G4XAqmElastic::G4XAqmElastic()
58 {
59 // As a first approximation the model is assumed to be valid over
60 // the entire energy range
61 }
62
63
64 G4XAqmElastic::~G4XAqmElastic()
65 { }
66
67
68 G4bool G4XAqmElastic::operator==(const G4XAqmElastic &right) const
69 {
70 return (this == (G4XAqmElastic *) &right);
71 }
72
73
74 G4bool G4XAqmElastic::operator!=(const G4XAqmElastic &right) const
75 {
76 return (this != (G4XAqmElastic *) &right);
77 }
78
79
80 G4double G4XAqmElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
81 {
82 G4double sigma = 0.;
83
84 // Reference to be checked!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
85 static const G4double coeff = 0.39;
86 static const G4double param = 1.5;
87
88 G4XAqmTotal aqmTotal;
89
90 G4double sigmaTot = aqmTotal.CrossSection(trk1,trk2);
91 sigma = coeff * G4Pow::GetInstance()->powA(sigmaTot,param);
92
93 // Verify that elastic cross section < total cross section
94
95 if (sigma > sigmaTot)
96 throw G4HadronicException(__FILE__, __LINE__, "G4XAqmElastic::CrossSection - elastic cross section greater than total");
97
98 return sigma;
99 }
100
101
102 G4String G4XAqmElastic::Name() const
103 {
104 G4String name("AqmElasticCrossSection");
105 return name;
106 }
107
108
109 G4bool G4XAqmElastic::IsValid(G4double e) const
110 {
111 G4bool answer = InLimits(e,_lowLimit,_highLimit);
112
113 return answer;
114 }
115