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 #include "globals.hh" 00028 #include "G4BetaFermiFunction.hh" 00029 00030 const G4double G4BetaFermiFunction::PI=3.14159; 00031 00033 // 00034 // calculate the Fermi Function foe energy E0 00035 // 00036 G4double G4BetaFermiFunction::GetFF( const G4double E0) 00037 { 00038 G4double A1, A2; 00039 G4double P, U, S, Y; 00040 G4double F2; 00041 G4double E = E0+1.; 00042 P=std::sqrt(E*E-1.0) ; 00043 U=Z/137.0; 00044 S=std::sqrt(1.0-U*U) - 1.; 00045 Y = 2*PI*U*E/P; 00046 A1 = U*U*E*E + P*P/4.; 00047 A2 = std::fabs(Y/(1-std::exp(-Y))); 00048 F2 = std::pow(A1,S) * A2; 00049 return F2; 00050 } 00051 00053 // 00054 // calculate the Fermi normalization factor 00055 // here E0 is the end point energy of the beta decay 00056 // 00057 G4double G4BetaFermiFunction::GetFFN(const G4double E0) 00058 { 00059 00060 G4double A1, A2; 00061 G4double P, U, S, Y; 00062 G4double F2,E; 00063 G4double EE = E0/100.; 00064 U=Z/137.0; 00065 S=std::sqrt(1.0-U*U) - 1.; 00066 G4double F1 = 1E-10; 00067 for (G4int i = 1; i<=100 ; i++) { 00068 E = G4double(i)*EE + 1.; 00069 P=std::sqrt(E*E-1.0) ; 00070 Y = 2*PI*U*E/P; 00071 A1 = U*U*E*E + P*P/4.; 00072 A2 = std::fabs(Y/(1-std::exp(-Y))); 00073 F2 = std::pow(A1,S) * A2; 00074 if (F2 > F1) F1 = F2; 00075 } 00076 return F1; 00077 } 00078 00079 00080 00081 00082 00083 00084 00085 00086 00087 00088 00089 00090 00091 00092 00093 00094 00095 00096