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JEFF and EFF Projects

Project overview

The Joint Evaluated Fission and Fusion (JEFF) project is a collaboration between the countries participating in the NEA Data Bank. The JEFF library contains sets of evaluated nuclear data, mainly for fission and fusion applications; it contains a number of different data types, including neutron and proton interaction data, radioactive decay data, fission yield data, thermal scattering law data and photo-atomic interaction data.

The latest JEFF library, JEFF-3.1, is available free of charge on CD and on the JEFF-3.1 library Web pages. Processed data will also be available during 2006.

The JEFF-3.1 Nuclear Data Library

The JEFF-3.1 Nuclear Data Library is the latest version of the Joint Evaluated Fission and Fusion Library. The complete suite of data was released in May 2005, and contains general purpose nuclear data evaluations compiled at the NEA Data Bank in co-operation with several laboratories in NEA Data Bank member countries. JEFF-3.1 contains also radioactive decay data, activation data and fission yields data. It combines the efforts of the JEFF and EFF Working Groups who have contributed to this combined fission and fusion file. This library supersedes JEFF-3.0. The library contains neutron reaction data, incident proton data and thermal neutron scattering law data in the ENDF-6 format.

The library can be downloaded in its entirety as a single file or one file per isotope from the JEFF-3.1 Project page. A CD-ROM of the complete library can also be requested free of charge by sending an e-mail request.


The JEFF-3.0 Nuclear Data Library

The JEFF-3.0 Nuclear Data Library version of the Joint Evaluated Fission and Fusion General Purpose File was released in April 2002. It contains nuclear data evaluations compiled at the NEA Data Bank in co-operation with several laboratories in NEA Data Bank member countries. It combines the efforts of the old JEF and EFF Working Groups who have contributed to this first version of a combined fission and fusion file. The library superseded JEF-2.2, JEF-1 and EFF-2.4. The library contains neutron reaction data for 340 isotopes or elements and 5 thermal neutron scattering law data in the ENDF-6 format.

The library can be searched using the online retrieval interface to our EVA database or can be downloaded in its entirety as a single file or a file per isotope from our EVATAPES area. A CD-ROM of the complete library can also be requested free of charge by sending an e-mail request.

Documentation: "The JEFF-3.0 General Purpose Library", JEFF Report 19, published in 2005, with free copies available on request.

JEFF-3.1 evaluations are held by the NEA and any questions regarding their availability or status should be addressed to Dr. Yolanda Rugama rugama@nea.fr


JEFF meetings

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

  • Benchmarking, testing and evaluations
  • Radioactive decay and fission yield data
  • Experimental data
  • Fission Product data
  • Fusion relevant data

The JEFF project is a collaboration with the European Fusion File (EFF) and European Activation File (EAF) projects (funded by the EC Fusion Programme). The EFF/EAF projects are directed by the EFF/EAF monitor group. This group normally hold it's meetings in conjunction with the JEFF working group meetings, with joint JEFF sessions to discuss matters of common interest. This collaboration started in 1995, and the first joint library was JEFF-3.0, released in 2002.

Agenda and presentations from previous meetings of relevance for the JEFF project can found below:



Documentation for the JEFF and EFF projects


Useful references

The summary documentation of the JEFF-3.1 library is now available as JEFF Report 21, which is the accepted main reference for the JEFF-3.1 library.

The documentation for the JEFF-3.0 library is available as JEFF Report 19, which is the accepted main reference for the JEFF-3.0 library.

Final summary documentation for the JEF-2.2 library is available as JEFF Report 17, which is the accepted main reference for the JEF-2.2.

Other material has already been published describing the results of the thorough benchmark testing programme. Below are listed three references to the JEFF library project. This list is complemented by the great deal of information provided in the JEF/DOC working papers (presented at the JEFF working group meetings).

  1. A.J. Koning, et al. "The JEFF evaluated data project", Proceedings of the International Conference on Nuclear Data for Science and Technology, Nice, 2007

  2. 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, 2004, p.177

  3. R. Jacqmin, R. Forrest, J. Rowlands, A. Nouri, and M. Kellett, "Status of the JEFF Project", Jour of Nucl Sci and Techn, Supp 2, 2002, proceedings of the International Conference on Nuclear Data for Science and Technology, Tsukuba, 2001, p.54

  4. C.Nordborg, M.Salvatores,"Status of the JEF Evaluated Data Library", Proceedings of the International Conference on Nuclear Data for Science and Technology, Gatlinburg, 1994, p.680

  5. E. Fort, M.Salvatores,"JEF2 Validation", Proceedings of the International Conference on Nuclear Data for Science and Technology, Gatlinburg, 1994, p.768

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 on-line in PDF format. (Note: The download of these documents is restricted to members of the JEFF and EFF Working Groups).

List of JEF documents
List of EFF documents
JEFF Reports

JEFF Reports are more 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.

List of JEFF Reports
Origin of the JEF-2.2 library evaluations

The origin of evaluations used in JEF-1 and their development through the JEF-2 libraries (upto JEF-2.2) are presented for quick reference in tabular form by isotope.

Origin of JEF-2.2 evaluations

For the origin of the evalutations in JEFF-3.1, please see the JEFF-3.1 library page

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 listing 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.

User Feedback on JEFF-3.1

Please use the following link to view and input any feedback regarding the JEFF-3.1 library (processing problems, benchmarking evidence...). This feedback will be reviewed by the JEFF Working Group and corrective actions and recommendations will be proposed.

Below is a listing of the feedback received to date. We would encourage users of the library to notify us of any additional problems which are not already included in this list.

Feedback on JEFF-3.1
User feedback on JEFF-3.0

Please use the following link to view and input any feedback regarding the JEFF-3.0 library (processing problems, benchmarking evidence...).

Feedback on JEFF-3.0
User feedback on JEFF-2.2

The JEF-2.2 library feedback serves to identify deficiencies in the library, thus helping us to prepare improvements for the future releases of the library. Please inform us about further feedback not already in the list below. This can be done via e-mail to the .

Feedback on JEF-2.2

Status of new EFF evaluations

The EFF project is producing new evaluations periodically and the status of these regarding date of release (actual or expected) along with the name of the responsible person/evaluator are given in the table. This allows benchmarking to be carried out on a given file with a known status and allows formal approval of an evaluation into the EFF file. There are currently no plans to release a complete new library within the EFF project name, but the EFF project and its new evaluations are part of the wider scope of the JEFF project. All EFF evaluations are held by the NEA and any questions regarding their availability or status should be addressed to Hans Henriksson.

Status of new EFF evaluations

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Last updated: 11 Dec 2007

 

 

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