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Joint Evaluated Fission and Fusion (JEFF) Library version 3.0

The Joint Evaluated Fission and Fusion File (JEFF-3.0) is an evaluated library produced via an international collaboration of Data Bank member countries co-ordinated under the auspices of the NEA Data Bank. The JEFF-3.0 library comprises at present only a general purpose library including thermal scattering law data for 5 materials. This general purpose library was released in April 2002. It is in ENDF-6 format and contains data for 340 materials from 1-H-1 to 99-Es-255.

Superseded library

Please note that this is a superseded library that was approved for formal release but has been replaced with a newer official library version.


The complete set of data, including incident-neutron files and thermal scattering data are available online at:



NEA (2005), "The JEFF-3.0 Nuclear Data Library", JEFF Report 19, NEA No. 3711, ISBN : 92-64-01046-7, Available online.