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 latest version, JEFF-3.1.2, released in February 2012, contains a number of different data types, including neutron and proton interaction data, radioactive decay data, fission yields, and thermal scattering law data. Currently, JEFF-3.1.2 data are available in ENDF-6 format (neutron library) from the Web.
JEFF-3.1.2 is also provided free of charge in ENDF-6 and ACE format on CD/DVD.
JEFF data can be easily displayed and compared with other evaluated or experimental data using the JANIS software.
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:
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 materials have been published describing the results of the thorough benchmark testing programme. Below, some references to the JEFF library project are listed.
This list is complemented by the great deal of information provided in the JEF/DOC working papers.
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).
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.
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. There are currently no plans to release a completely 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.
Last modified: 7 November 2012