This database has been translated from the JEFF-3.2 incident neutron data library (written in ENDF-6 format) into the Geant4 format by E. Mendoza and D. Cano-Ott. Information concerning the conversion process can be found in [1]. The procedure for installing the libraries is as follows: 1- Copy the following four G4NDL folders to the new libraries folders: cp -r [...]/G4NDL4.5/IsotopeProduction [...]/JEFF-3.2/ cp -r [...]/G4NDL4.5/JENDL_HE [...]/JEFF-3.2/ cp -r [...]/G4NDL4.5/ThermalScattering [...]/JEFF-3.2/ cp -r [...]/G4NDL4.5/Inelastic/Gammas [...]/JEFF-3.2/Inelastic/ 2- Set the G4NEUTRONHPDATA environmental variable [path to the G4NDL format data libraries] (in the .bashrc or equivalent) file to the new library folder: #export G4NEUTRONHPDATA=[...]/G4NDL4.5 export G4NEUTRONHPDATA=[...]/JEFF-3.2 [1] E. Mendoza, D. Cano-Ott, T. Koi and C. Guerrero, IEEE Trans. Nucl. Science 61 (2014) 2357.