JEFF-4T5 Downloads

Each evaluation contains 5 files:

- the cumulative FY evaluation in the ENDF6 format

- the independent FY evaluation in the ENDF6 format

- the cumulative FY correlation matrix

- the independent FY correlation matrix

- a file describing how to read and use the correlation matrices

JEFF-4T5 takes TSL from JEFF-4T4, with the addition of:

- ThO2

- Zy4 (Zircaloy)

And minor corrections for:

- Zr and H in ZrH_1.5 (Zirconium Hydride)

- Zr and H in ZrH_2 (Zirconium Hydride)

JEFF-4T5 library for incident protons contains evaluations for 287 naturally abundant nuclides, originated from TENDL-2023, JENDL-5 and ENDF/B-VIII.1 libraries.

The latest update (14/3/2025) concerns Th-232 file, both Evaluations and ACE files. A new file has been added for Ra-226.

JEFF-4T5 sublibrary for decay data includes JEFF-3.3 data with new TAGS data for 8 radionuclides (Rb-93, Y-96, Y-96m, Y-99, Tc-103, Tc-108, I-138, and Cs-142). The Q-value has been updated in Tc-99 evaluation as well as EC/B- branching and decay radiation for Am-242.

Major changes compared to JEFF-4T4:

- All TENDL files have been replaced with the latest TENDL-2025 data, released in February 2025.

- Al-27 was taken from JEFF-4T3 after benchmarking JEFF-4T4.

- Updates to the Major Actinides have been implemented.

- Covariances restored for F-19, Cr-50, Cr-52, Cr-53, Cr-54, Cu-63, Cu-65.

- Pm-147 and Pm-148m have been corrected due to inconsistent level ordering in isomeric production.

- Ta-181 has been adopted from ENDF/B-IX-beta.

- Minor corrections were made on many files.

For a comprehensive overview of the changes introduced in JEFF-4T5, we invite you to refer to this spreadsheet: JEFF-4 Evolution. It provides detailed insights into the modifications made.

- Evaluated file format issues corrected for: C-12, Fe-54, Fe-57.

- Evaluated file name issues corrected for: I-137, I-138, I-139, W-195, W-196 and W-197 (only applies to the 2855 isotopes package).