LIBOUT format

The format of the multigroup-constant sublibrary is the LIBOUT format of the code FOUR ACES (ENEA Bologna), with two additional comment lines for each reaction, which are copied from the pointwise EAF file. For the reaction numbers,  the ENDF-reaction number MT multiplied by 10 has been adopted, with the convention that for the excitation of each metastable state the MT is increased by one. The material numbers (MAT) consist of Z, A and an identifier to indicate ground or metastable target (MAT =Z*10000 + A*10 + LIS). The order of the cross-sections in the file is according to the increasing Z, A, LIS, MT and LFS ( the identifiers LIS and LFS are used to indicate the states of the target and final nucleus, respectively).