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Status of the JEFF project: 2008

The JEFF project involves evaluation efforts that cover the main nuclear data needs in the fields of fission and fusion applications. This initiative has provided the means for co-operative activities between participating countries while ensuring the most rational and efficient use of available resources. Although JEFF is an OECD/NEA project, the USA and Japan continue to develop their own nuclear data libraries, and therefore the JEFF project involves essentially scientists from European countries. The overall structure of the project is depicted in fig. 1. Development of the JEFF libraries is not directly financed, and is based on the voluntary participation of European institutes and scientists. Staff at the NEA Data Bank ensure the maintenance of the JEFF library, and biannual JEFF meetings bring together experts in different areas such as data evaluations, experimental studies, reaction modelling, verification and compilation of the data under strict quality assurance procedures, file processing and benchmarking. The latest version of the JEFF-3.1 library was released in May 2005 [1], and contains a neutron-induced reaction data library with 381 isotopes or elements, a proton library with 26 isotopes, and thermal scattering law data for 9 materials. Special purpose libraries on radioactive decay data with 3852 isotopes and spontaneous and neutron fission yield data (for 19 isotopes) are available, as well as an activation data library containing 12617 neutron-induced reactions on 774 target nuclei, which is based on the European Activation File EAF-2003. While existing reactors