[819] | 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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