在积分实验中使用 MLEM 算法精确测定脉冲时间分布

IF 2.6 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Technology Pub Date : 2024-09-02 DOI:10.1016/j.net.2024.08.060
S.Y. Zhang, Y.B. Nie, Y.Y. Ding, Q. Zhao, K.Z. Xu, X.Y. Pan, H.T. Chen, Q. Sun, Z. Wei
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引用次数: 0

摘要

积分实验通过提供验证理论模型和改进反应堆设计的关键数据,在推动核科学与技术发展方面发挥着至关重要的作用。本研究提出了一种新方法,用于在使用脉冲加速器进行的积分实验中精确测定脉冲时间分布。通过在与光束方向成 0° 和 90° 角的位置战略性地放置监测器和防护罩,测量了来自目标的中子飞行时间,并通过模拟构建了不同时间中子发射的响应矩阵。采用最大似然期望最大化(MLEM)算法进行脉冲时间重建,并将监测器中的伽马射线飞行时间频谱作为初始频谱,以简化计算过程。使用标准聚乙烯样品和 n-p 散射截面进行的实验验证证实了该方法的准确性。比较了多个核数据库(如 CENDL-3.2、ENDF/B-VIII.0、JENDL-5.0 和 JEFF-3.3 库)的结果。所开发的方法大大提高了脉冲时间分布测定的精确度,从而提高了利用脉冲加速器进行积分实验所获得的实验数据的质量和可靠性。
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Accurate pulse time distribution determination using MLEM algorithm in integral experiments
Integral experiments play a crucial role in advancing nuclear science and technology by providing critical data that validate theoretical models and enhance reactor designs. This study presents a novel approach to accurately determine pulse time distribution in integral experiments conducted with pulsed accelerators. By strategically placed monitors and shields at angles of 0° and 90° relative to the beam direction, neutron flight times from the target are measured, and a response matrix for neutron emission at different times is constructed through simulation. The Maximum Likelihood Expectation Maximization (MLEM) algorithm is employed for pulse time reconstruction, with the gamma ray flight time spectrum from monitors used as the initial spectrum to streamline the computational process. Experimental validation using a standard polyethylene sample and n-p scattering cross-sections confirms the accuracy of the method. Results are compared across multiple nuclear databases such as CENDL-3.2, ENDF/B-VIII.0, JENDL-5.0, and JEFF-3.3 libraries. The developed method significantly enhances the precision of pulse time distribution determination, thereby improving the quality and reliability of experimental data obtained from integral experiments conducted with pulsed accelerators.
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来源期刊
Nuclear Engineering and Technology
Nuclear Engineering and Technology 工程技术-核科学技术
CiteScore
4.80
自引率
7.40%
发文量
431
审稿时长
3.5 months
期刊介绍: Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development
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