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首页> 外文期刊>Annals of nuclear energy >Absolute measurement of β_(eff) based on Feynman-α experiments and the two-region model in the IPEN/MB-01 research reactor
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Absolute measurement of β_(eff) based on Feynman-α experiments and the two-region model in the IPEN/MB-01 research reactor

机译：根据Feynman-α实验和IPEN / MB-01研究堆中的两区域模型对β_（eff）进行绝对测量

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摘要

A new methodology for absolute measurement of the effective delayed neutron fraction β_(eff) based on Feynman-α experiments and the two-region model was developed. This method made use of Feynman-α experiments and the two-region model. To examine the present methodology, a series of Feynman-α experiments were conducted at the IPEN/MB-01 research reactor facility. In contrast with other techniques like the slope method, Nelson-number method and ~(252)Cf-source method, the main advantage of this new methodology is to obtain β_(eff) with the required accuracy and without knowledge of any other parameter. By adopting the present approach, β_(eff) was measured with a 0.67% uncertainty. In addition, the prompt neutron generation time, Λ, and other parameters, was also obtained in an absolute experimental way. In general, the measured parameters are in good agreement with the values found from frequency analysis experiments. The theory-experiment comparison for the β_(eff) measured in this work shows that JENDL3.3 presented the best agreement (within 1%). The reduction of the ~(235)U thermal yield as proposed by Okajima and Sakurai is completely justified according to the β_(eff) measurements performed in this work.
机译：基于Feynman-α实验和二区域模型，开发了一种绝对测量有效延迟中子分数β_（eff）的新方法。该方法利用了Feynman-α实验和两区域模型。为了检查本方法，在IPEN / MB-01研究反应堆设施进行了一系列费曼α实验。与其他方法（如斜率法，尼尔森数法和〜（252）Cf源法）相比，此新方法的主要优势是获得具有所需精度且无需任何其他参数的β_（eff）。通过采用本方法，β_（eff）的测量不确定度为0.67％。另外，还以绝对实验方式获得了迅速的中子产生时间，Λ和其他参数。通常，测得的参数与从频率分析实验中找到的值非常吻合。对这项工作中测得的β_（eff）进行的理论与实验比较表明，JENDL3.3表现出最佳的一致性（在1％以内）。根据这项工作中进行的β_（eff）测量，完全可以证明冈下和樱井提出的〜（235）U热产率的降低。

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