Abstract
Nuclear data collection, evaluation and dissemination activities have been performed worldwide for many years. They are absolutely essential for the overall progress of science and technology to create the complete collections of experimental data sets and associated publications, and store these data in publicly accessible databases. Due to many historical and technological reasons not all published data have been identified and compiled. These "missing data" manifest themselves via scientific publications, data evaluations and nuclear databases comparisons. The detailed analysis of the Nuclear Science References (NSR) and the Experimental Nuclear Reaction (EXFOR) databases shows thousands of previously missed nuclear reaction experiments and creates a roadmap for the creation of complete data records for fission cross sections, yields and covariances. The National Nuclear Data Center (NNDC) program for identification, compilation and storage of missing fission yields data sets is described, and recommendations for improving the databases completeness are given.
Highlights
Compilation and evaluation of neutron cross sections have been pioneered at Brookhaven National Laboratory (BNL) in the early 1950s [1]
Several currently run nuclear reaction data projects such as the Atlas of Neutron Resonances reference book [4], Evaluated Nuclear Data File (ENDF) [5] and Experimental Nuclear Reaction Data (EXFOR) ([6] and references therein) libraries originate from the Brookhaven endeavor
The Nuclear Science References (NSR) database was extensively searched for missing references, these data were analyzed, the research facilities were identified, PDF files for the articles were collected, and all these materials were passed to the responsible compilation centers
Summary
Compilation and evaluation of neutron cross sections have been pioneered at Brookhaven National Laboratory (BNL) in the early 1950s [1]. Several currently run nuclear reaction data projects such as the Atlas of Neutron Resonances reference book [4], Evaluated Nuclear Data File (ENDF) [5] and Experimental Nuclear Reaction Data (EXFOR) ([6] and references therein) libraries originate from the Brookhaven endeavor These efforts laid a foundation for worldwide nuclear data compilation and evaluation activities in subsequent years, and led to the creation of other data centers in Vienna, Austria (Nuclear Data Section or NDS-IAEA), Paris, France (Nuclear Energy Agency or NEA-Databank) and Obninsk, USSR (Center Jadernykh Dannykh or CJD) in 1963-1964. The geographical separation of compilation work has been a very productive mechanism for interactions between researchers and data compilers who speak the same language, and it helped to make EXFOR one of the first truly international collaborations This partnership has produced the only continuouslyupdated low- and intermediate-energy nuclear reaction database that is publicly available from the NDS-IAEA.
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