| 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: G4hZiegler1977Nuclear
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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 | // Nuclear stopping power parametrised according to
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| 44 | // J.F.Ziegler, Helium Stopping Powers and
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| 45 | // Ranges in All Elemental Matter, Vol.4, Pergamon Press, 1977
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| 46 | //
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| 47 | // Class Description: End
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| 48 | //
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| 49 | // -------------------------------------------------------------------
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| 50 | //
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| 51 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 52 |
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| 53 | #include "G4hZiegler1977Nuclear.hh"
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| 54 | #include "G4UnitsTable.hh"
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| 55 | #include "globals.hh"
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| 56 | #include "Randomize.hh"
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| 57 |
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| 58 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 59 |
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| 60 | G4hZiegler1977Nuclear::G4hZiegler1977Nuclear():G4VhNuclearStoppingPower()
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| 61 | {;}
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| 62 |
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| 63 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 64 |
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| 65 | G4hZiegler1977Nuclear::~G4hZiegler1977Nuclear()
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| 66 | {;}
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| 67 |
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| 68 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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| 69 |
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| 70 | G4double G4hZiegler1977Nuclear::NuclearStoppingPower(G4double kineticEnergy,
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| 71 | G4double z1, G4double z2,
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| 72 | G4double m1, G4double m2) const
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| 73 | {
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| 74 | G4double energy = kineticEnergy/keV ; // energy in keV
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| 75 | G4double ionloss ;
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| 76 |
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| 77 | G4double rm = (m1 + m2) * std::sqrt( std::pow(z1, 0.667) + std::pow(z2, 0.667) ) ;
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| 78 |
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| 79 | G4double er = 32.53 * m2 * energy / ( z1 * z2 * rm ) ; // reduced energy
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| 80 |
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| 81 | if ( er < 0.01 ) {
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| 82 | ionloss = std::sqrt(er) * 1.593 ;
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| 83 |
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| 84 | } else if ( er < 10.0 ) {
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| 85 | ionloss = 1.7 * std::sqrt(er) * std::log(er + std::exp(1.0)) /
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| 86 | (1.0 + 6.8 * er + 3.4 * std::pow(er, 1.5)) ;
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| 87 |
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| 88 | } else {
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| 89 | ionloss = std::log(0.47 * er) * 0.5 / er ;
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| 90 | }
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| 91 |
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| 92 | // Stragling
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| 93 | if(lossFlucFlag) {
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| 94 | G4double sig = 4.0 * m1 * m2 * std::sqrt( (std::pow(z1, 0.23) + std::pow(z2, 0.23)) /
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| 95 | (std::pow(z1, 0.667) + std::pow(z2, 0.667)) )
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| 96 | / ((m1 +m2)*(m1 + m2)*
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| 97 | (4.0 + 0.197*std::pow(er,-1.6991)+6.584*std::pow(er,-1.0494))) ;
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| 98 |
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| 99 | ionloss *= G4RandGauss::shoot(1.0,sig) ;
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| 100 | }
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| 101 |
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| 102 | ionloss *= 8.462 * z1 * z2 * m1 / rm ; // Return to [ev/(10^15 atoms/cm^2]
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| 103 |
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| 104 | if ( ionloss < 0.0) ionloss = 0.0 ;
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| 105 |
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| 106 | return ionloss;
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| 107 | }
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| 108 |
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| 109 |
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| 110 |
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