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