Infological models of the ENDF format nuclear data
Issues of the infologic modeling of the ENDFformat nuclear data libraries for the purpose of converting ENDF files into a relational database are considered. The transfer to a relational format will make it possible to use standard public software for nuclear data processing, which simplifies the conversion and operation of this information array. Infological models are described using formulas of the «Entity (List of Attributes)» type. The proposed infological formulas are based on the physical nature of data and defining theoretical relations. This eliminates the need for a special notation to be introduced to describe the structure and the content of data, which, in turn, facilitates the use of relational formats in design codes and solution of nuclear data estimation problems. The concept of nuclear informatics has been formulated based on relational DBMS technologies as one of the tools to solve the problem of «big data» in modern science and technology. The organizational and technological grounds for the transfer of ENDF libraries to a relational format are presented. The requirements to the nuclear data presentation formats supported by relational DBMS are listed. Features of the infological model construction, conditioned by the hierarchical nature of nuclear data, are identified. The order for the ENDF metadata preservation is presented, which can be useful for the verification and validation (testing of the structural and syntactical validity and operability) of both source data and the procedures for conversion into a relational format. Formulas of infological models are presented for the crosssections file, the secondary neutron energy distributions file, and the nuclear reaction product energyangular distributions file. A complete array of infological models for ENDF libraries and the generation modules of respective relational tables have been published on a publicly available website.
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