The JEFF project is a collaborative effort among NEA Data Bank member countries to develop a reference nuclear data library for use in different nuclear energy applications. The JEFF 3/A is the Activation Data Library in ENDF-6 format prepared from the European Activation File (EAF). The JEFF-3/A library contains 12,617 excitation functions involving 774 different targets from 1H to 257Fm, atomic numbers 1 to 100, in the energy range 10-5 eV to 20 MeV. Uniquely, an uncertainty file is also provided that quantifies the degree of confidence placed on the data for each reaction channel. The data is stored in ENDF-6 format.
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