JEFF and EFF projects


The JEFF Nuclear Data Library

The Joint Evaluated Fission and Fusion File (JEFF) project is a collaboration between NEA Data Bank member countries. The JEFF library combines the efforts of the JEFF and EFF/EAF Working Groups to produce a common sets of evaluated nuclear data, mainly for fission and fusion applications.

The JEFF suite of nuclear data libraries contains a number of different data types, including neutron and proton interaction data, radioactive decay data, fission yields, and thermal scattering law data.

The latest release, JEFF-3.2 general purpose neutron data library (March 2014) is available in ENDF-6 and ACE formats from the Web.

JEFF data can be easily displayed and compared with other evaluated or experimental data using the JANIS software.


JEFF meetings

The JEFF project is managed by a scientific co-ordination group (SCG) that meets twice a year. Technical achievements are reviewed at working group meetings in conjunction with the SCG meetings. The topics covered are:


Documentation for the JEFF and EFF projects

JEFF Reports

JEFF Reports are detailed studies carried out on very specific aspects of the JEFF project and can be used for referencing purposes. These are available free of charge from the NEA.

The documentation of the JEF(F) libraries is published in the JEFF Report series:

Other references

Other materials have been published describing the results of the thorough benchmark testing programme. Below, some references to the JEFF library project are listed.

  1. A.J. Koning, et al. "Status of the JEFF Nuclear Data Library", Proceedings of the International Conference on Nuclear Data for Science and Technology, Jeju Island, Korea, 2010, p.1057
  2. A.J. Koning, et al. "The JEFF evaluated nuclear data project", Proceedings of the International Conference on Nuclear Data for Science and Technology, Nice, France, 2007, p.721
  3. A.J. Koning, O. Bersillon, R.A. Forrest, R. Jacqmin, M.A. Kellett, A. Nouri, and P. Rullhusen, "Status of the JEFF Nuclear Data Library", Proceedings of the International Conference on Nuclear Data for Science and Technology, Santa Fe, USA, 2004, p.177
  4. R. Jacqmin, R. Forrest, J. Rowlands, A. Nouri and M. Kellett, "Status of the JEFF Project", Journal of Nuclear Science and Technology, Supp 2, 2002, proceedings of the International Conference on Nuclear Data for Science and Technology, Tsukuba, Japan, 2001, p.54
  5. C. Nordborg, M. Salvatores, "Status of the JEF Evaluated Data Library", Proceedings of the International Conference on Nuclear Data for Science and Technology, Gatlinburg, USA, 1994, p.680
  6. E. Fort, M. Salvatores, "JEF2 Validation", Proceedings of the International Conference on Nuclear Data for Science and Technology, Gatlinburg, USA, 1994, p.768

This list is complemented by the great deal of information provided in the JEF/DOC working papers.

JEF/DOC and EFF/DOC documents

Below are links to the lists of all the documents in the JEF/DOC and EFF-Doc series. Most of these documents are papers presented at the various working group meetings of the JEFF and EFF projects. These documents are available online in PDF format. (Note: The download of these documents is restricted to members of the JEFF and EFF Working Groups).


User feedback on the JEFF library

The JEFF libraries have all undergone extensive benchmark testing. As a result of this testing, a considerable amount of valuable feedback has been provided. This feedback serves to identify deficiencies in the current version of the JEFF library, thus helping us to prepare improvements for the next release of the library.

Below is a list of the feedback received to date for the new as well as the older versions of the JEFF library. We would encourage users of the library to notify us of any additional problems which are not already included in this list.

Last modified: 7 March 2014