Gabriele Cosmo
110 lines
3.8 KiB
C++
110 lines
3.8 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: G4hZiegler1985Nuclear
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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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// Nuclear stopping power parametrised according to
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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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//
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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 "G4hZiegler1985Nuclear.hh"
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#include "G4UnitsTable.hh"
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#include "globals.hh"
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#include "Randomize.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4hZiegler1985Nuclear::G4hZiegler1985Nuclear():G4VhNuclearStoppingPower()
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{;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4hZiegler1985Nuclear::~G4hZiegler1985Nuclear()
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{;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4hZiegler1985Nuclear::NuclearStoppingPower(G4double kineticEnergy,
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G4double z1, G4double z2,
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G4double m1, G4double m2) const
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{
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G4double energy = kineticEnergy/keV ; // energy in keV
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G4double ionloss ;
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G4double rm = (m1 + m2) * ( std::pow(z1, .23) + std::pow(z2, .23)) ;
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G4double er = 32.536 * m2 * energy / ( z1 * z2 * rm ) ; // reduced energy
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if ( er <= 30 ) {
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ionloss = 0.5*std::log(1+1.1383*er)/
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(er+0.01312*std::pow(er,0.21226)+0.19593*std::sqrt(er)) ;
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} else {
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ionloss = 0.5*std::log(er)/er ;
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}
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// Stragling
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if(lossFlucFlag) {
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G4double sig = 4.0 * m1 * m2 / ((m1 + m2)*(m1 + m2)*
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(4.0 + 0.197*std::pow(er,-1.6991)+6.584*std::pow(er,-1.0494))) ;
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ionloss *= G4RandGauss::shoot(1.0,sig) ;
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}
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ionloss *= 8.462 * z1 * z2 * m1 / rm ; // Return to [ev/(10^15 atoms/cm^2]
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if ( ionloss < 0.0) ionloss = 0.0 ;
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return ionloss;
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}
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