94 lines
3.5 KiB
C++
94 lines
3.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4VhElectronicStoppingPower
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//
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// Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
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//
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// Creation date: 20 July 2000
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//
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// Modifications:
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// 20/07/2000 V.Ivanchenko First implementation
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//
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// Class Description:
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//
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// Low energy hadrons/ions electronic stopping power parametrisation
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//
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// Class Description: End
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4VhElectronicStoppingPower.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4UnitsTable.hh"
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#include "G4Exp.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4VhElectronicStoppingPower::G4VhElectronicStoppingPower():
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theHeMassAMU(4.0026)
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{;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4VhElectronicStoppingPower::~G4VhElectronicStoppingPower()
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{;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4VhElectronicStoppingPower::HeEffChargeSquare(
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const G4double z,
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const G4double kineticEnergyHe) const
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{
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// The aproximation of He effective charge from:
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// J.F.Ziegler, J.P. Biersack, U. Littmark
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// The Stopping and Range of Ions in Matter,
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// Vol.1, Pergamon Press, 1985
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static const G4double c[6] = {0.2865, 0.1266, -0.001429,
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0.02402,-0.01135, 0.001475} ;
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G4double e = std::log( std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ;
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G4double x = c[0] ;
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G4double y = 1.0 ;
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for (G4int i=1; i<6; i++) {
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y *= e ;
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x += y * c[i] ;
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}
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G4double w = 7.6 - e ;
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w = 1.0 + (0.007 + 0.00005*z) * G4Exp( -w*w ) ;
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w = 4.0 * (1.0 - G4Exp(-x)) * w * w ;
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return w;
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}
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