JEFF-3.3 Evaluated Data: radioactive decay data

The JEFF-3.3 release includes a comprehensive radioactive decay data library, providing evaluated information on half-lives, branching ratios, decay modes, and emitted radiation for thousands of isotopes. The data are distributed both as a set of individual isotope files and as a single combined file covering all nuclides. This library supports reactor physics, fuel cycle analysis, decay heat calculations, and radiological assessments by supplying consistent and traceable decay data aligned with the JEFF-3.3 evaluation.