JEFF-3.1.2 - Neutron Data

This release has been superseded

The Joint Evaluated Fission and Fusion File is an evaluated library produced via an international collaboration of Data Bank member countries co-ordinated under the auspices of the NEA Data Bank. The new JEFF-3.1.2 general purpose library is in ENDF-6 format and contains incident neutron data for 381 isotopes or elements from 1-H-1 to 100-Fm-255.

JEFF-3.1.2 is provided free of charge in ENDF-6 and ACE format (download ACE files here ). JEFF-3.1.2 is available through the JANIS database.

This release is an update from JEFF-3.1.1 which concerns 115 material files which have been modified since JEFF-3.1.1. Modifications include :

• 6 new evaluations for Hf isotopes have replaced previous ones (see JEF/DOC-1297 and JEF/DOC-1324)
• Gamma production data from neutron capture (MF=6 MT=102) has been added to 89 fission products (FP) evaluations (see JEF/DOC-1387 and JEF/DOC-1300)
  • 47 of these FP have been replaced by ENDF-B/VII.0 evaluations, with gamma data added in this release
• Corrections from JEFF-Beta feedback (see JEF/DOC-1362 and JEF/DOC-1367) have been incorporated for 15 materials
• Minor corrections that solve NJOY covariance processing problems and JANIS warnings have been made to 6 files. These specific changes are documented here .

Download a compressed file with all neutron data (381 individual ENDF-6 Files) JEFF312N.zip (63 MB)

Or find below the individual ENDF-6 files for this update :

Last reviewed: 10 March 2016