Experimental nuclear spectroscopic data are evaluated for 11 known nuclides of mass 31 (F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K). Detailed evaluated information is presented for each reaction and decay experiment. Combining all the available data, recommended values are provided for energies, spins and parities, and half-lives of levels, with energies, branching ratios and multipolarities of γ radiations, and characteristics of β and α radiations in radioactive decays. ³¹P is the most extensively studied one among all nuclides via various reactions and decays, followed by ³¹S, ³¹Si, ³¹Mg and ³¹Al. Information for excited states in ³¹Ne, ³¹Na, ³¹Cl, ³¹Ar and ³¹K are limited; no excited states have yet been identified in ³¹F, even its ground-state half-life is unknown. Significant new data have become available for the structure of ³¹S, with its relevance to astrophysical applications. This work supersedes the earlier evaluation of A=31 by 2013Ou01, with literature cutoff date of Feb 15, 2013.

对质量为 31 的 11 种已知核素（F、Ne、Na、Mg、Al、Si、P、S、Cl、Ar、K）的实验核光谱数据进行了评估。为每个反应和衰变实验提供了详细的评估信息。结合所有可用数据，提供了能量、自旋和奇偶校验、能级半衰期的推荐值，以及γ辐射的能量、分支比和多极性，以及放射性衰变中β和α辐射的特性。³¹ P 是所有核素中通过各种反应和衰变研究最广泛的一种，其次是³¹ S、³¹ Si、³¹ Mg 和³¹ Al。激发态的信息³¹ Ne、³¹ Na、³¹ Cl、³¹ Ar和³¹ K是有限的；^在31 F中尚未确定激发态，甚至其基态半衰期也是未知的。³¹ S结构的重要新数据已经可用，它与天体物理应用相关。这项工作取代了 2013Ou01 之前对 A=31 的早期评估，文献截止日期为 2013 年 2 月 15 日。