1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | #include "G4XpimNTotal.hh" |
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27 | #include <cmath> |
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28 | |
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29 | G4XpimNTotal:: |
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30 | G4XpimNTotal() |
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31 | { |
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32 | std::pair<double,double> it; |
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33 | it.first=1105.46 ;it.second= 8.8; theLowEData.push_back(it); |
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34 | it.first=1139.41 ;it.second= 13.6; theLowEData.push_back(it); |
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35 | it.first=1165.12 ;it.second= 26.0; theLowEData.push_back(it); |
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36 | it.first=1198.8 ;it.second= 60.; theLowEData.push_back(it); |
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37 | it.first=1212.51 ;it.second= 70.; theLowEData.push_back(it); |
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38 | it.first=1222.84 ;it.second= 72.; theLowEData.push_back(it); |
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39 | it.first=1233.18 ;it.second= 68.; theLowEData.push_back(it); |
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40 | it.first=1240.08 ;it.second= 65.; theLowEData.push_back(it); |
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41 | it.first=1301.86 ;it.second= 30.; theLowEData.push_back(it); |
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42 | it.first=1335.65 ;it.second= 26.; theLowEData.push_back(it); |
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43 | it.first=1368.93 ;it.second= 27.; theLowEData.push_back(it); |
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44 | it.first=1433.81 ;it.second= 30.; theLowEData.push_back(it); |
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45 | it.first=1496.42 ;it.second= 45.; theLowEData.push_back(it); |
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46 | it.first=1508.67 ;it.second= 47.; theLowEData.push_back(it); |
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47 | it.first=1520.84 ;it.second= 45.; theLowEData.push_back(it); |
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48 | it.first=1568.67 ;it.second= 35.; theLowEData.push_back(it); |
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49 | it.first=1603.69 ;it.second= 37.; theLowEData.push_back(it); |
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50 | it.first=1660.54 ;it.second= 58.; theLowEData.push_back(it); |
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51 | it.first=1674.47 ;it.second= 59.; theLowEData.push_back(it); |
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52 | it.first=1688.29 ;it.second= 58.; theLowEData.push_back(it); |
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53 | it.first=1779.57 ;it.second= 36.; theLowEData.push_back(it); |
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54 | it.first=1881.49 ;it.second= 36.8; theLowEData.push_back(it); |
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55 | it.first=1978.31 ;it.second= 34.5; theLowEData.push_back(it); |
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56 | it.first=2038.82 ;it.second= 34.5; theLowEData.push_back(it); |
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57 | it.first=2115.39 ;it.second= 36.; theLowEData.push_back(it); |
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58 | it.first=2159.18 ;it.second= 36.3; theLowEData.push_back(it); |
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59 | it.first=2244.22 ;it.second= 36.; theLowEData.push_back(it); |
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60 | it.first=2424.78 ;it.second= 33.; theLowEData.push_back(it); |
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61 | it.first=2664.2 ;it.second= 32.; theLowEData.push_back(it); |
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62 | it.first=3487.43 ;it.second= 28.; theLowEData.push_back(it); |
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63 | it.first=4434.76 ;it.second= 26.7; theLowEData.push_back(it); |
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64 | } |
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65 | |
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66 | G4double G4XpimNTotal:: |
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67 | CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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68 | { |
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69 | G4double sqrts = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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70 | if(sqrts > theLowEData.back().first/MeV) return thePDGData.CrossSection(trk1, trk2); |
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71 | G4double result = 0; |
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72 | size_t i(0), it(0); |
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73 | if(sqrts<theLowEData[0].first) return 0; |
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74 | for(i=0; i<theLowEData.size(); i++) |
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75 | { |
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76 | if(theLowEData[i].first/MeV>sqrts) break; |
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77 | it = i; |
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78 | } |
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79 | G4double x1 = std::log(theLowEData[it].first); |
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80 | G4double x2 = std::log(theLowEData[it+1].first); |
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81 | G4double y1 = std::log(theLowEData[it].second); |
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82 | G4double y2 = std::log(theLowEData[it+1].second); |
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83 | G4double x = std::log(sqrts); |
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84 | G4double y = y1+(x-x1)*(y2-y1)/(x2-x1); |
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85 | result = std::exp(y); |
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86 | return result*millibarn; |
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87 | } |
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