| 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 #include <cmath>
27 #include "G4Exp.hh"
28 #include "G4Log.hh"
29 #include "G4XpipNTotal.hh"
30 #include "G4SystemOfUnits.hh"
31
32 G4XpipNTotal::
33 G4XpipNTotal()
34 {
35 std::pair<double,double> it;
36 it.first=1105.46; it.second= 6.4; theLowEData.push_back(it);
37 it.first=1133.28; it.second= 18.0; theLowEData.push_back(it);
38 it.first=1165.12; it.second= 66.0; theLowEData.push_back(it);
39 it.first=1198.8; it.second= 160.; theLowEData.push_back(it);
40 it.first=1212.51; it.second= 199.; theLowEData.push_back(it);
41 it.first=1233.18; it.second= 195.; theLowEData.push_back(it);
42 it.first=1301.86; it.second= 73.8; theLowEData.push_back(it);
43 it.first=1368.93; it.second= 35.0; theLowEData.push_back(it);
44 it.first=1433.81; it.second= 22.0; theLowEData.push_back(it);
45 it.first=1496.42; it.second= 15.0; theLowEData.push_back(it);
46 it.first=1556.84; it.second= 15.2; theLowEData.push_back(it);
47 it.first=1615.21; it.second= 19.4; theLowEData.push_back(it);
48 it.first=1671.7; it.second= 25.; theLowEData.push_back(it);
49 it.first=1726.44; it.second= 26.; theLowEData.push_back(it);
50 it.first=1779.57; it.second= 30.; theLowEData.push_back(it);
51 it.first=1881.49; it.second= 40.; theLowEData.push_back(it);
52 it.first=1930.49; it.second= 40.; theLowEData.push_back(it);
53 it.first=2070.69; it.second= 30.; theLowEData.push_back(it);
54 it.first=2202.11; it.second= 29.; theLowEData.push_back(it);
55 it.first=2326.19; it.second= 30.7; theLowEData.push_back(it);
56 it.first=2405.38; it.second= 30.7; theLowEData.push_back(it);
57 it.first=2733.67; it.second= 28.3; theLowEData.push_back(it);
58 it.first=3207.21; it.second= 26.5; theLowEData.push_back(it);
59 it.first=4434.76; it.second= 25.0; theLowEData.push_back(it);
60 }
61
62 G4double G4XpipNTotal::
63 CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
64 {
65 G4double sqrts = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
66 if(sqrts > theLowEData.back().first/MeV) return thePDGData.CrossSection(trk1, trk2);
67 G4double result = 0;
68 size_t i(0), it(0);
69 if(sqrts<theLowEData[0].first) return 0;
70 for(i=0; i<theLowEData.size(); i++)
71 {
72 if(theLowEData[i].first/MeV>sqrts) break;
73 it = i;
74 }
75 G4double x1 = G4Log(theLowEData[it].first);
76 G4double x2 = G4Log(theLowEData[it+1].first);
77 G4double y1 = G4Log(theLowEData[it].second);
78 G4double y2 = G4Log(theLowEData[it+1].second);
79 G4double x = G4Log(sqrts);
80 G4double y = y1+(x-x1)*(y2-y1)/(x2-x1);
81 result = G4Exp(y);
82 return result*millibarn;
83 }
84