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 // $Id$ 00028 // 00029 // Hadronic Process: Nuclear De-excitations 00030 // by V. Lara (Oct 1998) 00031 // 00032 00033 00034 #include "G4EvaporationLevelDensityParameter.hh" 00035 #include "G4SystemOfUnits.hh" 00036 #include "G4HadronicException.hh" 00037 00038 // Those values are from table 3 in 00039 // A.S. Iljinov et al. Nucl Phys A543 (1992) 517-557 00040 // Table 3. alpha, beta and gamma for Cameron Shell corrections 00041 // whithout collective effects. f-factor = 2.31. 00042 00043 //JMQ 17-04-08 these are not used at present in G4Evaporation 00044 const G4double G4EvaporationLevelDensityParameter::ConstEvapLevelDensityParameter = 0.125/MeV; 00045 //const G4double G4EvaporationLevelDensityParameter::ConstEvapLevelDensityParameter= 0.0769231/MeV; 00046 const G4double G4EvaporationLevelDensityParameter::alpha = 0.072/MeV; 00047 const G4double G4EvaporationLevelDensityParameter::beta = 0.257/MeV; 00048 const G4double G4EvaporationLevelDensityParameter::gamma = 0.059/MeV; 00049 const G4double G4EvaporationLevelDensityParameter::Bs = 1.0; 00050 00051 G4EvaporationLevelDensityParameter::G4EvaporationLevelDensityParameter() {} 00052 G4EvaporationLevelDensityParameter::~G4EvaporationLevelDensityParameter() {} 00053 00054 G4double 00055 G4EvaporationLevelDensityParameter::LevelDensityParameter(G4int A, G4int, G4double) const 00056 //JMQ (Apr .08) this is the method used in G4Evaporation 00057 { 00058 00059 //JMQ 25/04/08 a=A/10 according to original Gudima's prescription 00060 G4double a=static_cast<G4double>(A)/10.; 00061 return a; 00062 // 00063 00064 // G4int N = A - Z; 00065 00066 // Asymptotic Level Density Parameter 00067 // G4double AsymptoticLDP = (alpha*static_cast<G4double>(A) + beta*std::pow(static_cast<G4double>(A),2./3.)*Bs)/MeV; 00068 00069 // Shape of the LDP U dependence 00070 // G4double exponent = -gamma*U; 00071 // G4double f = 1.; 00072 // if (exponent > -300.) f -= std::exp(exponent); 00073 00074 // Level Density Parameter 00075 // G4double a = AsymptoticLDP*(1. + ShellCorrection(Z,N)*f/U); 00076 // return a; 00077 } 00078