Extensive Study of the Quality of Fission Yields from Experiment, Evaluation and GEF for Antineutrino Studies and Applications

IF 2.8 1区 物理与天体物理 Q2 PHYSICS, NUCLEAR Nuclear Data Sheets Pub Date : 2021-03-01 DOI:10.1016/j.nds.2021.04.004
K.-H. Schmidt , M. Estienne , M. Fallot , S. Cormon , A. Cucoanes , T. Shiba , B. Jurado , K. Kern , Ch. Schmitt
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引用次数: 4

Abstract

The understanding of the antineutrino production in fission and the theoretical calculation of the antineutrino energy spectra in different, also future, 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. This is a complex task because the yields depend on the fissioning nucleus and on the energy spectrum of the incident neutrons.

In the present contribution, the quality of different sources of information on the fission yields is investigated, and the benefit of a combined analysis is demonstrated. The influence on antineutrino predictions is discussed.

In a systematic comparison, the quality of fission-product yields emerging from different experimental techniques is analyzed. The traditional radiochemical method, which is almost exclusively used for evaluations, provides an unambiguous identification in Z and A, but it is restricted to a limited number of suitable targets, is slow, and the accuracy suffers from uncertainties in the spectroscopic nuclear properties. Experiments with powerful spectrometers, for example at LOHENGRIN, provide very accurate mass yields and a Z resolution for light fission products from thermal-neutron-induced fission of a few suitable target nuclei.

On the theoretical side, the general fission model GEF has been developed. It combines a few general theorems, rules and ideas with empirical knowledge. GEF covers almost all fission observables and is able to reproduce measured data with high accuracy while having remarkable predictive power by establishing and exploiting unexpected systematics and hidden regularities in the fission observables. In this article, we have coupled for the first time the GEF predictions 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 by the antineutrino energy spectra. 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.

The main results of this study are:

  • an improved agreement between the antineutrino energy spectra obtained with the newly tuned GEF model and the JEFF-3.1.1 and JEFF-3.3 fission yields for the four main contributors to fission in standard power reactors;

  • indications for shortcomings of mass yields for 241Pu(nth, f) and other systems in current evaluations;

  • a demonstration of the benefit from cross-checking the results of different experimental approaches and GEF for improving the quality of nuclear data;

  • an analysis of the sources of uncertainties and erroneous results from different experimental approaches;

  • the capacity of GEF for predicting the fission yields (and other observables) in cases (in terms of fissioning systems and excitation energies) which are presently not accessible to experiment;

  • predictions of antineutrino energy spectra that aim to assess the prospects for reactor monitoring, and based on the GEF fission yields associated with the beta-decay data of the most recent summation model.

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反中微子研究与应用的实验、评价和GEF裂变产物质量的广泛研究
对裂变中反中微子产生的理解,以及不同类型的、未来的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,在求和方法中,对经历β衰变的不同放射性核素的个体贡献进行估计和求和。最准确地估计独立的裂变产物的产率对这种计算至关重要。这是一项复杂的任务,因为产量取决于裂变核和入射中子的能谱。在目前的贡献中,研究了不同来源的裂变产率信息的质量,并证明了综合分析的好处。讨论了对反中微子预测的影响。在系统的比较中,分析了不同实验技术产生的裂变产物的质量。传统的放射化学方法,几乎完全用于评估,提供了对Z和A的明确识别,但它仅限于有限数量的合适目标,速度慢,精度受到光谱核性质的不确定性的影响。用强大的光谱仪进行的实验,例如在LOHENGRIN,为一些合适的目标核的热中子诱导裂变产生的轻裂变产物提供了非常精确的质量产率和Z分辨率。在理论方面,建立了通用的裂变模型GEF。它结合了一些一般定理、规则和经验知识。GEF几乎涵盖了所有的裂变观测数据,能够高精度地再现测量数据,同时通过建立和利用裂变观测数据中意想不到的系统性和隐藏规律,具有显著的预测能力。在本文中,我们首次在反应堆反中微子能谱的求和计算中将GEF对裂变产率的预测与裂变产物β衰变数据结合起来。从GEF获得的光谱与从评估的核数据库获得的光谱之间进行的第一次比较显示出巨大的差异,突出了反中微子光谱建模的紧迫性,并显示了它们在核数据评估中的有用性。因此,为了达到反中微子能谱所要求的精度水平,需要对GEF模型施加额外的约束。对独立同位素产率的仔细研究和LOHENGRIN裂变产率数据的附加约束相结合,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衰变产率与大亚湾实验测量的产率的比较表明,GEF模型对基础或应用反中微子物理具有良好的预测能力。本研究的主要结果是:-改进了用新调谐的GEF模型得到的反中微子能谱与标准动力反应堆中四个主要裂变源的jeff3.1.1和jeff3.3裂变产率之间的一致性;-指出了241Pu(n)的质量产率的缺点;f)和当前评估中的其他系统;-论证交叉检查不同实验方法和GEF的结果对提高核数据质量的好处;-分析不同实验方法的不确定性和错误结果的来源;- GEF在目前无法获得的情况下(就裂变系统和激发能而言)预测裂变产率(和其他可观察到的结果)的能力实验-反中微子能谱预测,旨在评估反应堆监测的前景,并基于GEF裂变产率与最新求和模型的β衰变数据相关。
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来源期刊
Nuclear Data Sheets
Nuclear Data Sheets 物理-物理:核物理
CiteScore
7.80
自引率
5.40%
发文量
22
审稿时长
>12 weeks
期刊介绍: The Nuclear Data Sheets are current and are published monthly. They are devoted to compilation and evaluations of experimental and theoretical results in Nuclear Physics. The journal is mostly produced from Evaluated Nuclear Structure Data File (ENSDF), a computer file maintained by the US National Nuclear Data Center
期刊最新文献
Nuclear Data Sheets for A=30 Nuclear Structure and Decay Data for A=230 Nuclear Data Sheets Symbols and Abbreviations Measurement of the 134Cs half-life in support of the exponential-decay law A case of understated uncertainties in half-life measurements
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