The joint evaluated file: A new nuclear data library for reactor calculations

Abstract The Joint Evaluated File Project (JEF) was set up in 1982 in the framework of the NEA Data Bank as a collaboration between laboratories in Member countries. The project is steered by a Scientific Coordination Group. Reactor physicists and nuclear physicists from Member countries join representatives of the NEA Data Bank to decide on the selection of evaluations and to plan the benchmark testing and future evaluation programme. It would be invidious to name individual authors in such a project: the rapporteurs named above are two contributors among many. A library, called JEF-1, has now been assembled and tested and is available to scientists in NEA Data Bank Member countries. It uses the ENDF/B-V format. Neutron interaction data are provided for some 300 nuclides. The ENDF/B-V Standards file has been adopted. For the remaining nuclides the data have been selected from recent American, Japanese and European evaluations, with only limited re-evaluations. New evaluations have been adopted for therma...