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ABSTRACT
This article is the second part of a two part review presenting the nuclear data evaluation process. It describes the present state of the theoretical knowledge of the nuclear physics processes involved in reactor physics. After an overview of fission process and the associated observables (yields, spectra and multiplicities), theoretical models are described. During the evaluation process, the theoretical and experimental knowledge is distilled and synthetized into the files used by simulation codes. This review is illustrated by examples chosen from everyday practice of nuclear data evaluation.
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Olivier SÉROT: Research engineer - Cadarache Center, French Atomic Energy and Alternative Energies Commission, Saint-Paul-lez-Durance, France
INTRODUCTION
This article is dedicated to fission observables, which constitute important nuclear data for numerous applications, which explains the substantial efforts made by the international community to evaluate them. These data concern :
fission yields ;
the characteristics (energy spectra and multiplicities) of "prompt" neutrons and gammas.
In order to understand how these nuclear data are evaluated, we feel it's essential first to recall the main stages in the fission process. Nuclei (called "fission fragments" or "fission products", depending on the stage) may be formed, and particles (mainly neutrons and gamma rays) may be emitted with a probability that depends on both the time and energy required for their emission.
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KEYWORDS
nuclear data | simulation codes | fission process | evaluation process
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Nuclear engineering
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Reactor physics – Modeling and evaluation of fission observables
Brief description of the fission process
Bibliography
Websites
International library of experimental data :
https://www-nds.iaea.org/exfor/exfor.htm
Institute for Research on the Fundamental Laws of the Universe (IRFU)
http://irfu.cea.fr/Phocea/Vie_des_labos/Ast/ast_technique.php?id_ast=449
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