To ensure a level of quality required to protect the public, experimental nuclear data results are occasionally
evaluated by a Nuclear Data Organization to form a nuclear data library. These organizations review multiple measurements and agree upon the highest-quality measurements before publishing the libraries. For unmeasured or very complex data regimes, the parameters of
nuclear models are adjusted until the resulting data matches well with
critical experiments. The result of an evaluation is almost universally stored as a set of data files in Evaluated Nuclear Data File (ENDF) format. To keep the size of these files reasonable, they contain a combination of actual data tables and
resonance parameters that can be reconstructed into pointwise data with specialized tools (such as NJOY).
Nuclear Data Organizations • The International Network of Nuclear Reaction Data Centres (NRDC) constitutes a worldwide cooperation of nuclear data centres under the auspices of the
International Atomic Energy Agency. The Network was established to coordinate the worldwide collection, compilation and dissemination of nuclear reaction data. • The
Cross Section Evaluation Working Group (CSEWG) is the National Nuclear Data Organization of the
United States and
Canada. This is a cooperative effort of the
national laboratories, industry, and universities that produces the ENDF/B file. • The
Joint Evaluated Fission and Fusion (JEFF) organization consists of members of the
Nuclear Energy Agency (NEA) of the
Organisation for Economic Co-operation and Development (OECD). They produce the JEFF file, which is also in the universal ENDF format. • The Japanese Nuclear Data Committee (JNDC) handles the Japanese Evaluated Nuclear Data Library (JENDL). This effort is coordinated through the Nuclear Data Center at the
Japan Atomic Energy Agency (JAEA). ==Releases of ENDF/B Files==