The National Nuclear Data Center provides evaluated nuclear structure and decay data through its databases.
Dataset
Joint Evaluated Fission and Fusion File
The NEA GitLab hosts the Joint Evaluated Fission and Fusion Library and version-controlled evaluated nuclear data files.
About Joint Evaluated Fission and Fusion File
The JEFF pages provide access to the Joint Evaluated Fission and Fusion nuclear data library through links to evaluated and processed data files developed on the NEA GitLab. JEFF-4.0, released in June 2025, is the latest official release. The library is intended for work in nuclear energy, fusion, space and earth exploration, medical isotope production and nuclear science. Some content is restricted and hosted on GitLab repositories or data pipelines on the NEA local datacentre.
Pricing is not clearly stated.
Key features
- Version control for evaluated files and, in some cases, modelling inputs, model parameters and output data
- JEFF-4.0 neutron-induced reaction data, with updates to fission yields, proton-induced reaction data and decay data
- Older JEFF releases from 1986 to 2017, superseded by JEFF-4.0
Best for: Work in nuclear energy, fusion, space and earth exploration, medical isotope production or nuclear science.
Joint Evaluated Fission and Fusion File at a glance
- Official website
- databank.io.oecd-nea.org/data/jeff/jeff_official
- Category
- Research & Data › Health & Medical Data
- Type
- Dataset
- Platforms
- Web
- Details verified
- Oct 22, 2026 · Official source
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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