Abstract
The automatic construction of evolution chains recently implemented in GALILEE system is based on the analysis of several ENDF files : the multigroup production cross sections present in the GENDF files processed by NJOY from the ENDF evaluation, the decay file and the fission product yields (FPY) file. In this context, this paper highlights the importance of the nucleus identification to properly interconnect the data mentioned above.The first part of the paper describes the present status of the nucleus identification among the several ENDF files focusing, in particular, on the use of the excited state number and of the isomeric state number. The second part reviews the problems encountered during the automatic construction of the depletion chains using recent ENDF data. The processing of the JEFF-3.1.1, ENDF/B-VII.0 (decay and FPY) and the JEFF-3.2 (production cross section) points out problems about the compliance or not of the nucleus identifiers with the ENDF-6 format and sometimes the inconsistencies among the various ENDF files. In addition, the analysis of EAF-2003 and EAF-2010 shows some incoherence between the ZA product identifier and the reaction identifier MT for the reactions ( n , pα ) and ( n , 2np ).As a main result of this work, our suggestion is to change the ENDF format using systematically the isomeric state number to identify the nuclei. This proposal is already compliant to a huge amount ENDF data that are not in agreement with the present ENDF format. This choice is the most convenient because, ultimately, it allows one to give human readable names to the nuclei of the depletion chains.
Highlights
The automatic construction of evolution chains for depletion and transport codes like MENDEL[1] and APOLLO3 R [2] is one of the last novelty in the nuclear data processing system GALILEE[3]
The automatic construction of evolution chains recently implemented in GALILEE system is based on the analysis of several ENDF files : the multigroup production cross sections present in the GENDF files processed by NJOY from the ENDF evaluation, the decay file and the fission product yields (FPY) file
The first part of the paper describes the present status of the nucleus identification among the several ENDF files focusing, in particular, on the use of the excited state number and of the isomeric state number
Summary
The automatic construction of evolution chains for depletion and transport codes like MENDEL[1] and APOLLO3 R [2] is one of the last novelty in the nuclear data processing system GALILEE[3]. In this context, this paper highlights the importance of a correct nucleus identification to properly interconnect the depletion data (decay modes, production cross sections and fission product yields). The various nuclear data in ENDF format[4], which are necessary to automatically construct an evolution chain, use different incomplete identifiers for products coming from the fission, from the nuclear reactions and from the decay. Some anomalies of nucleus identification while processing JEFF-3.1.1, JEFF-3.2, EAF-2003, EAF-2010 and ENDF/B-VII.0 evaluations are pointed out
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