22Na 半衰期的测量和支持指数衰减规律的证据

IF 2.8 1区 物理与天体物理 Q2 PHYSICS, NUCLEAR Nuclear Data Sheets Pub Date : 2024-02-01 DOI:10.1016/j.nds.2024.01.002
S. Pommé , H. Stroh , J. Paepen
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引用次数: 0

摘要

22Na 的半衰期是通过在一个温度稳定的房间内使用重入式电离室在 14.5 年中进行的 523 次活性测量确定的。这些数据是从总共 127 830 次电离电流测量中筛选和汇总的,其重现性标准偏差为 0.065%。电离电流是在空气电容器上收集的,并以电压随时间的变化进行测量。指数衰减曲线的残差显示出一个明显的年周期,振幅为 0.0055 (5)%,在补偿了与环境湿度的相关性后,降至 0.0012 (5)%。这些数据证实了指数衰减规律的有效性,在日标、月标和多年度标尺上都没有 0.0005 % 标准偏差的周期性扰动。本研究获得的 22Na 半衰期值为 950.68 (12) d 或 2.60290 (34) a,相对标准不确定性为 0.013 %。该值与文献中其他测量结果的平均值一致,尽管后者存在不确定性预算不完整的问题。由于统计精度高,系统误差的不确定性估计保守,这项工作获得的结果可作为可靠的参考值推荐使用。
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Measurement of the 22Na half-life and evidence supporting the exponential-decay law

The half-life of 22Na has been determined through 523 activity measurements over 14.5 years with a re-entrant ionisation chamber in a temperature-stabilised room. The data were selected and aggregated from in total 127 830 ionisation current measurements with a reproducibility of the order of 0.065 % standard deviation. The ionisation current was collected over an air capacitor and measured as a change of voltage over time, which warrants excellent linearity with activity throughout the experiment. The residuals to an exponential decay curve show a distinct annual cycle of 0.0055 (5) % amplitude, which reduces to 0.0012 (5) % after compensation for a correlation with ambient humidity. The data confirm the validity of the exponential-decay law, in absence of cyclic perturbations at daily, monthly, and multi-annual scale at the level of 0.0005 % standard deviation. The 22Na half-life value obtained in this study is 950.68 (12) d or 2.60290 (34) a, with a relative standard uncertainty of 0.013 %. This value is consistent with the mean value of other measurement results in the literature, although the latter have an issue with incomplete uncertainty budgets. Owing to the high statistical accuracy and conservative uncertainty estimate of systematic errors, the result obtained in this work can be recommended as a reliable reference value.

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来源期刊
Nuclear Data Sheets
Nuclear Data Sheets 物理-物理:核物理
CiteScore
7.80
自引率
5.40%
发文量
22
审稿时长
>12 weeks
期刊介绍: The Nuclear Data Sheets are current and are published monthly. They are devoted to compilation and evaluations of experimental and theoretical results in Nuclear Physics. The journal is mostly produced from Evaluated Nuclear Structure Data File (ENSDF), a computer file maintained by the US National Nuclear Data Center
期刊最新文献
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