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arXiv 2012.08199nucl-ex
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从实验、评价和反中微子研究和应用的GEF中广泛研究fission产率的质量

Extensive study of the quality of fission yields from experiment, evaluation and GEF for antineutrino studies and applications

K. -H. Schmidt, M. Estienne, M. Fallot, S. Cormon, A. Cucoanes, B. Jurado, K. Kern, Ch. Schmitt, T. Shiba

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88 pages, 100 figures
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摘要：

对裂变过程中反中微子产生的理解以及对不同类型裂变反应堆中反中微子能谱的理论计算依赖于求和方法的应用，该方法对经历β衰变的不同放射性核素的单个贡献进行估计和求和。对独立裂变产物产额的最精确估计对这一计算至关重要。我们已经耦合的第一次一般裂变模型GEF的裂变产额的裂变产物β衰变数据的总和计算反应堆反中微子能谱的预测。从全球环境基金和那些获得的评价核数据库的光谱之间进行的第一次比较表现出很大的差异，突出了反中微子光谱的建模的迫切性，并显示其在核数据的评价有用。因此，需要对全球环境基金的模式施加更多的限制，以达到所需的准确程度。与全球环境基金一起调查了关于裂变产额的不同信息来源的质量，并证明了综合分析的好处。分析了不同实验技术产生的裂变产额的质量，并指出了某些研究裂变系统质量产额的不足。对独立同位素产额的仔细研究和作为附加约束的LOHENGRIN裂变产额数据的加入相结合，导致用GEF计算的反中微子谱与评估数据之间的一致性大大提高。用GEF计算的反β衰变产额与大亚湾实验测得的结果的比较表明，GEF模型对基础或应用反中微子物理具有很好的预测能力。

英文摘要：

The understanding of the antineutrino production in fission and the theoretical calculation of their energy spectra in different types of fission reactors rely on the application of the summation method, where the individual contributions from the different radioactive nuclides that undergo a beta decay are estimated and summed up. The most accurate estimation of the independent fission-product yields is essential to this calculation. We have coupled for the first time the predictions of the general fission model GEF for the fission yields to fission-product beta-decay data in a summation calculation of reactor antineutrino energy spectra. The first comparisons performed between the spectra from GEF and those obtained with the evaluated nuclear databases exhibited large discrepancies that highlighted the exigency of the modelisation of the antineutrino spectra and showing their usefulness in the evaluation of nuclear data. Additional constraints for the GEF model were thus needed in order to reach the level of accuracy required. The quality of different sources of information on the fission yields has been investigated with GEF, and the benefit of a combined analysis is demonstrated. The quality of fission yields emerging from different experimental techniques has been analyzed and indications for shortcomings of mass yields for some of the studied fissioning systems were provided. The combination of a careful study of the independent isotopic yields and the adjunction of the LOHENGRIN fission-yield data as additional constraints led to a substantially improved agreement between the antineutrino spectra computed with GEF and with the evaluated data. The comparison of inverse beta-decay yields computed with GEF with those measured by the Daya Bay experiment shows the excellent level of predictiveness of the GEF model for the fundamental or applied antineutrino physics.

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