00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // ------------------------------------------------------------------- 00028 // 00029 // GEANT4 Class file 00030 // 00031 // 00032 // File name: G4hZiegler1977Nuclear 00033 // 00034 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch) 00035 // 00036 // Creation date: 20 July 2000 00037 // 00038 // Modifications: 00039 // 20/07/2000 V.Ivanchenko First implementation 00040 // 00041 // Class Description: 00042 // 00043 // Nuclear stopping power parametrised according to 00044 // J.F.Ziegler, Helium Stopping Powers and 00045 // Ranges in All Elemental Matter, Vol.4, Pergamon Press, 1977 00046 // 00047 // Class Description: End 00048 // 00049 // ------------------------------------------------------------------- 00050 // 00051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00052 00053 #include "G4hZiegler1977Nuclear.hh" 00054 00055 #include "globals.hh" 00056 #include "Randomize.hh" 00057 #include "G4SystemOfUnits.hh" 00058 #include "G4UnitsTable.hh" 00059 00060 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00061 00062 G4hZiegler1977Nuclear::G4hZiegler1977Nuclear():G4VhNuclearStoppingPower() 00063 {;} 00064 00065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00066 00067 G4hZiegler1977Nuclear::~G4hZiegler1977Nuclear() 00068 {;} 00069 00070 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00071 00072 G4double G4hZiegler1977Nuclear::NuclearStoppingPower(G4double kineticEnergy, 00073 G4double z1, G4double z2, 00074 G4double m1, G4double m2Local) const 00075 { 00076 G4double energy = kineticEnergy/keV ; // energy in keV 00077 G4double ionloss ; 00078 00079 G4double rm = (m1 + m2Local) * std::sqrt( std::pow(z1, 0.667) + std::pow(z2, 0.667) ) ; 00080 00081 G4double er = 32.53 * m2Local * energy / ( z1 * z2 * rm ) ; // reduced energy 00082 00083 if ( er < 0.01 ) { 00084 ionloss = std::sqrt(er) * 1.593 ; 00085 00086 } else if ( er < 10.0 ) { 00087 ionloss = 1.7 * std::sqrt(er) * std::log(er + std::exp(1.0)) / 00088 (1.0 + 6.8 * er + 3.4 * std::pow(er, 1.5)) ; 00089 00090 } else { 00091 ionloss = std::log(0.47 * er) * 0.5 / er ; 00092 } 00093 00094 // Stragling 00095 if(lossFlucFlag) { 00096 G4double sig = 4.0 * m1 * m2Local * std::sqrt( (std::pow(z1, 0.23) + std::pow(z2, 0.23)) / 00097 (std::pow(z1, 0.667) + std::pow(z2, 0.667)) ) 00098 / ((m1 +m2Local)*(m1 + m2Local)* 00099 (4.0 + 0.197*std::pow(er,-1.6991)+6.584*std::pow(er,-1.0494))) ; 00100 00101 ionloss *= G4RandGauss::shoot(1.0,sig) ; 00102 } 00103 00104 ionloss *= 8.462 * z1 * z2 * m1 / rm ; // Return to [ev/(10^15 atoms/cm^2] 00105 00106 if ( ionloss < 0.0) ionloss = 0.0 ; 00107 00108 return ionloss; 00109 } 00110 00111 00112