| 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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