Joint Evaluated Fission and Fusion (JEFF) Library version 4.0 test 1
The JEFF-4T1 nuclear data library content has been agreed upon in February 2022. It includes two sets of data containing 562 and 2813 neutron cross section evaluations, respectively.
Superseded test library
Please note that this is a superseded test library that has not been approved for formal release and has been replaced with another test library version. The latest official release remains JEFF-3.3.
Neutron cross section evaluations
The first set, as the previous versions of JEFF, includes the 562 most important isotopes for criticality calculations. The content of the library is described in the JEFF-4T1 Starter File. The second one includes the 562 isotopes of the previous set, but it is completed by the additional 2251 isotopes provided by TENDL-2021. This set is recommended for more general purposes.
Thermal scattering law data
The Thermal Scattering Law set includes 24 files, 19 of which are taken from JEFF-3.3. New evaluations are provided for H(H20), PuO2, and UO2. O(H2O) is taken from JENDL-5, while H(Lucite) is taken from ENDF/B-VIII.O. The TSL content in listed in the JEFF-4T1 Starter File.
Download links
Evaluated files
| Release | Format | Content | # files | Size | Download |
|---|---|---|---|---|---|
| JEFF-4T1 | ENDF-6 | Cross section evaluations | 563 | 511 MB | Link |
| JEFF-4T1 | ENDF-6 | Cross section evaluations | 2813 | 2.6 GB | Link |
| JEFF-4T1 | ENDF-6 | TSL evaluations | 24 | 180 MB | Link |
Processed files
| Release | Format | Code(s) used | Content | # files | Size | Download |
|---|---|---|---|---|---|---|
| JEFF-4T1 | ACE, XSDIR, NJOY inputs | NJOY | Continuous energy, 293K | 563 | 1.0 GB | Link |
| JEFF-4T1 | ACE, XSDIR, NJOY inputs | NJOY | H in H2O, 293K | 1 | 40 MB | Link |
| JEFF-4T1 | HDF5 | OpenMC | Continuous energy, 293K | 563 | 1.1 GB | Link |
Developer access
The repositories containing the evaluated data and all processing pipelines, including the containerised execution of codes that generate all processed data in the tables above, are located on the NEA GitLab.
Note
Access to the NEA GitLab and to the JEFF Lab is restricted to JEFF delegates. Please contact data@oecd-nea.org for more information.