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 | // |
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27 | // ------------------------------------------------------------------- |
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28 | // |
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29 | // GEANT4 Class file |
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30 | // |
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31 | // |
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32 | // File name: G4VhElectronicStoppingPower |
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33 | // |
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34 | // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch) |
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35 | // |
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36 | // Creation date: 20 July 2000 |
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37 | // |
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38 | // Modifications: |
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39 | // 20/07/2000 V.Ivanchenko First implementation |
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40 | // |
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41 | // Class Description: |
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42 | // |
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43 | // Low energy hadrons/ions electronic stopping power parametrisation |
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44 | // |
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45 | // Class Description: End |
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46 | // |
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47 | // ------------------------------------------------------------------- |
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48 | // |
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49 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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50 | |
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51 | #include "G4VhElectronicStoppingPower.hh" |
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52 | #include "G4UnitsTable.hh" |
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53 | |
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54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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55 | |
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56 | G4VhElectronicStoppingPower::G4VhElectronicStoppingPower(): |
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57 | theHeMassAMU(4.0026) |
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58 | {;} |
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59 | |
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60 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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61 | |
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62 | G4VhElectronicStoppingPower::~G4VhElectronicStoppingPower() |
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63 | {;} |
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64 | |
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65 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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66 | |
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67 | G4double G4VhElectronicStoppingPower::HeEffChargeSquare( |
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68 | const G4double z, |
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69 | const G4double kineticEnergyHe) const |
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70 | { |
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71 | // The aproximation of He effective charge from: |
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72 | // J.F.Ziegler, J.P. Biersack, U. Littmark |
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73 | // The Stopping and Range of Ions in Matter, |
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74 | // Vol.1, Pergamon Press, 1985 |
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75 | |
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76 | static G4double c[6] = {0.2865, 0.1266, -0.001429, |
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77 | 0.02402,-0.01135, 0.001475} ; |
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78 | |
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79 | G4double e = std::log( std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ; |
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80 | G4double x = c[0] ; |
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81 | G4double y = 1.0 ; |
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82 | for (G4int i=1; i<6; i++) { |
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83 | y *= e ; |
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84 | x += y * c[i] ; |
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85 | } |
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86 | |
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87 | G4double w = 7.6 - e ; |
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88 | w = 1.0 + (0.007 + 0.00005*z) * std::exp( -w*w ) ; |
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89 | w = 4.0 * (1.0 - std::exp(-x)) * w * w ; |
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90 | return w; |
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91 | } |
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