Abstract Spectroscopic data for known A=254 nuclides (U, Cf, Es, Fm, Md, No, Lr and Rf) have been updated and re-evaluated, superseding the data presented in the previous evaluation 2005Bh12 published by A. Bhagwat, N.J. Thompson and J.K. Tuli. With the exception of the 254No nuclide, excited-state data for A=254 nuclei are largely unknown. The decay of the 184−μs isomer in 254No has been studied in two independent experiments, results of which differ significantly, thus precluding adoption of any one particular decay scheme. Only the features that are consistent in these studies are included in the Adopted dataset, whereas independent decay schemes are presented in separate datasets. Information is also presented here for possible production of the 254U nuclide in a study (1960Di03) of debris of the first large-scale thermonuclear test (Ivy Mike) of November 1, 1952 in the Pacific Ocean.

中文翻译：

---

A=254 的核数据表

摘要 已知 A=254 核素（U、Cf、Es、Fm、Md、No、Lr 和 Rf）的光谱数据已更新和重新评估，取代了由 A. Bhagwat, NJ 发表的先前评估 2005Bh12 中提供的数据汤普森和 JK 图利。除了 254No 核素，A=254 核的激发态数据在很大程度上是未知的。在两个独立的实验中研究了 254No 中 184-μs 异构体的衰变，结果显着不同，因此排除了采用任何一种特定的衰变方案。只有在这些研究中一致的特征才包含在采用的数据集中，而独立的衰减方案则在单独的数据集中呈现。