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首页> 外文会议>International Conference on Nuclear Data for Science and Technology >A Noise Analysis Approach for Measuring the Decay Constants and the Relative Abundance of Delayed Neutrons in a Zero Power Critical Facility
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A Noise Analysis Approach for Measuring the Decay Constants and the Relative Abundance of Delayed Neutrons in a Zero Power Critical Facility

机译：一种测量零功率关键设施中衰减常数的衰减常数和延迟中子相对丰度的噪声分析方法

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This experimental work introduces a novice approach for the determination of the decay constants and the relative abundance of the delayed neutrons. The experimental procedure consists in obtaining the CPSD from the signals of two compensated ionization chambers in the frequency range from 0.005 to 5.0 Hz approximately. Assuming the point kinetic model, the theoretical expression for the CPSD can be written and the experimental CPSD can be fitted employing a least-square approach. The fitting parameters are β_i and λ_i. A preliminary experiment was made in the IPEN/MB-01 reactor. The least-square approach was able to fit all the betas for a six group model. However, it was not possible to fit the first decay constant (the group of longest half-live) accurately although the other five were achieved. The analysis reveals that the relative abundances of ENDF/B-IV and -VI are in a fair good agreement and that it is not only possible to perform successfully such measurements but also the decay constants and the relative abundance can be measured with a very good level of accuracy. ENDF/B-VI heavily underestimates the reactivity for small negative periods because its first decay constant is overestimated.
机译：该实验工作引入了一种新手方法，用于确定衰变常数和延迟中子的相对丰度。的实验方法包括从0.005到5.0赫兹获得从在频率范围内的两个补偿电离腔的信号的CPSD约。假设点动态模型，可以写入CPSD的理论表达，实验CPSD可以采用最小二乘方法。拟合参数是β_i和λ_i。在IPEN / MB-01反应器中进行了初步实验。最小二乘方法能够适合六组模型的所有β。但是，虽然实现了其他五，但不可能符合第一个衰减常数（最长半衰期）尽管实现了其他五个。该分析表明，ENDF / B-IV和-VI的相对丰富是公平的良好一致性，并且不仅可以成功地执行这种测量，而且可以用非常好的方式测量衰变常数和相对丰度。准确程度。 Endf / B-VI严重低估了小阴性时期的反应性，因为其第一个衰减常数高估。

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