EXFOR is the EXchange FORmat used by the Data Centres to exchange compiled experimental data. Designed initially for neutron reaction data, the format is flexible enough to be extended to the compilation of a great variety of data types: neutron, charged-particle and photon-induced reactions, as well as spontaneous fission data. More details can be obtained in brochures from the Data Centres or directly from the appropriate Web pages.

The flexibility of the format as well as the possibility to store all experimental details for evaluator access make EXFOR ideal for the worldwide compilation of experimental data. Furthermore, all the fission yield data from the Meek and Rider files that were missing in EXFOR have been converted and added to the EXFOR data base, which makes the latter almost complete with regard to fission yields.