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Systematics of log ft values for β−, and EC/β+ transitions
Atomic Data and Nuclear Data Tables ( IF 1.8 ) Pub Date : 2023-05-16 , DOI: 10.1016/j.adt.2023.101584
Steffen Turkat , Xavier Mougeot , Balraj Singh , Kai Zuber

This work is an update of the 1998 publication by Singh et al. [1] and reviews the log ft values for all the known β-decay branches (β−, β+/EC). Furthermore, an update of all Q-values (from AME2020 [2]), as well as a recalculation of all the log ft values (through BetaShape code [3], [4]) has been conducted using relevant data in the ENSDF database, as well as in newer literature. Only those cases have been considered in this review, where the beta transitions occur between levels of firm single spin assignments (86% of the transitions), and with probable single spin assignments (14% of the transitions), but with firm parity assignments for all the transitions. Weak β branches of <1% intensity in complex decay schemes have generally been omitted. Out of a total of 26 318 β transitions extracted from the ENSDF database and current literature, data for only 4038 β transitions survived the filtering criteria in the present review. The log ft values in β decay, spanning about 21 orders of magnitude, have been classified into allowed and forbidden categories according to the classification scheme of Konopinski [5]. All log ft values have been deduced using the BetaShape code with new developments presented in this study. A very few number of log ft values for very low-energy beta transitions (<5 keV) survived the cut criteria and are briefly discussed in terms of atomic overlap corrections. Also tabulated and briefly discussed are seven superallowed cases with ΔT = 0, Tz(parent) = −2, while a known case for 28S to 28P has been omitted as reliable EC/β+feeding to the analog state in 28P cannot be assigned due to lack of adequate experimental and detailed data for this decay. Centroid, width, minimum and maximum values for each category have been deduced. Uncertainties have been estimated and are also given. For literature coverage in the present review, see discussion in text.



中文翻译:

β− 和 EC/β+ 跃迁的 log ft 值的系统学

这项工作是 Singh 等人 1998 年出版物的更新。 [1]并查看日志 F所有已知值β-衰变分支(β−,β+/欧共体)。此外,更新所有-values(来自 AME2020 [2]),以及所有日志的重新计算 F值(通过 BetaShape 代码 [3][4])已经使用 ENSDF 数据库中的相关数据以及较新的文献进行了计算。本次审查仅考虑了那些情况,其中 beta 转换发生在稳固的单自旋分配(86% 的转换)之间,以及可能的单自旋分配(14% 的转换),但具有稳固的奇偶分配所有的过渡。虚弱的β的分支机构<复杂衰减方案中的 1% 强度通常被忽略。 在总共 26 318个中β从 ENSDF 数据库和当前文献中提取的转换,数据仅为 4038β过渡在本次审查中的过滤标准中幸存下来。日志 F中的值β根据 Konopinski [5]的分类方案,衰变跨越约 21 个数量级,分为允许和禁止类别 。所有日志 F值已使用 BetaShape 代码推导出来,并在本研究中提出了新的发展。日志数量极少 F非常低能量的 β 跃迁值(<5  keV) 在切割标准中幸存下来,并在原子重叠校正方面进行了简要讨论。还列出并简要讨论了七个超级允许的案例Ť = 0, Ťz(parent) = −2,而28 S 到28 P的已知案例已被省略为可靠的 EC/β+由于缺乏足够的实验和详细数据,无法分配28 P中的模拟状态。已推导出每个类别的质心、宽度、最小值和最大值。不确定性已被估计并给出。有关本综述中的文献报道,请参阅正文中的讨论。

更新日期:2023-05-16
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