Precise integral measurement of fast neutron-induced fission product yields for various actinides is of high interest for applied nuclear science. The goal of this effort is to improve uncertainties in fission product yield values of 239Pu. Fission was induced in a pure 239Pu (>99%) target using the Godiva IV critical assembly in burst mode. The irradiated sample was transferred to a high-resolution γ-ray detector within 45 minutes. γ-ray list mode data was collected from 45 minutes to 1 week after the irradiation. γ-ray spectroscopy was performed to analyze the time dependent γ-ray yields using an automated peak search algorithm to identify isotopes by their decay γ-ray energy and half-life. The initial activity for each isotope identified was used to calculate their fission product yield.

中文翻译：

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使用 Godiva IV Critical Assembly 的 239Pu 裂变谱累积裂变产物产量测量


各种锕系元素的快速中子诱导裂变产物产率的精确积分测量在应用核科学中具有高度意义。这项工作的目标是改善 239Pu 裂变产物产率值的不确定性。在突发模式下使用 Godiva IV 临界组件在纯 239Pu （>99%） 靶材中诱导裂变。在 45 分钟内将辐照样品转移到高分辨率 γ 射线探测器中。照射后 45 分钟至 1 周收集 γ 射线列表模式数据。进行γ射线光谱分析，使用自动峰值搜索算法分析随时间变化的γ射线产率，以通过同位素的衰变、γ射线能量和半衰期来识别同位素。鉴定出的每种同位素的初始活性用于计算它们的裂变产物产量。