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The ENDF formats were originally developed for use in the
US national nuclear data files called ENDF/B (the Evaluated
Nuclear Data Files). These files went through various versions
with names like ENDF/B-III, ENDF/B-IV, and ENDF/B-VI. The
formats were upgraded with each version to handle new features,
for example, the extension from the original upper limit of
15 MeV to 20 MeV, the addition of photon production information,
the introduction of new resonance formats, or the addition of
charged-particle data. As ENDF/B-VI was being prepared, it was
noted that the ENDF formats were coming into wide use around
the world, including the JEF files in Europe, the JENDL files
in Japan, and the BROND files in Russia. It was decided to
decouple the ENDF formats from the ENDF/B libraries in order to
make this international use easier. Therefore, we now refer
to the "ENDF-6 format" to distinguish it from the "ENDF/B-VI
library."
Control over the ENDF formats has been retained by the US
Cross Section Evaluation Working Group (CSEWG), and the format
specifications are published through the
National Nuclear Data
Center at the Brookhaven National Laboratory.
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