EAF format

The EAF format is essentially that of the MF=3 file of ENDF-5 format with the following deviations:

Two comment lines have been added in earlier stage: only one is now used stating the origin of data and the EAF revisions. The second one was used earlier to store more detailed information about renormalizations and is now empty.

• The material number MAT consists of Z and two last digits of A. To describe metastable targets MAT is increased by 50 or 70 (m1 or m2, respectively). For example, for ground   and first  metastable states in target nucleus 67-Ho-166 the material numbers are MAT=6766 and MAT=6816, respectively. For ground and second metastable states in target nucleus 65-Tb-156 the material numbers are MAT=6556 and 6626, respectively. Consequently, the order of the target nuclides (according to increasing MAT numbers) is not always in accordance with the increasing Z and A. This applies only to the pointwise format data, and not to the multi-group constant library,  for which another MAT numbers with more digits are used.

• The identifiers LIS and LFS are used to indicate states (isomers) of the target and final nuclei, respectively. Here the convention has been adopted that LFS = 99 means total production cross-section; LFS is 0 for ground state, 1 for m1, and 2 for m2. The reaction number MT is that of the ENDF format, except that MT's for reactions leading to metastable states are increased by 300 and 600 (for m1 and m2, respectively). In case the isomer production data are included, the standard MT's (as in the  ENDF format) denotes cross section for the production of the ground state ('g' not 'm+g').
• In the pointwise file the reaction to the ground state is given first and followed by the  reactions to the metastable states (if any).