Half-life measurement of short-lived nuclide 146Eu

IF 1.7 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A Pub Date : 2025-04-16 DOI:10.1016/j.nuclphysa.2025.123113

Changxin Guo, Yunju Li, Shengquan Yan, Minghao Zhu, Youbao Wang, Yuqiang Zhang, Jinlong Ma, Wei Nan, Tao Tian, Jianglin Hou, Jiayinhao Li

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Abstract

¹⁴⁶Sm is an important nuclide for both geochronological and astrophysical applications, its precise half-life value is essential for accurate geological applications. Nevertheless, significant discrepancies exist in the measured half-life values of ¹⁴⁶Sm. A new experimental method has been proposed by merely measuring the total amount of ¹⁴⁶Eu and the decay of ¹⁴⁶Sm, corresponding α and γ spectrometers have been developed for the measurement. The preliminary experiment has been carried out in HI-13 tandem accelerator of China Institute of Atomic Energy. Based on α and γ measurements, the half-life of ¹⁴⁷Eu has been double checked and the results agree well with existing values, which gives a verification for the reliability of our half-life measurement systems. The half-life of ¹⁴⁶Eu has been updated to

4.21 \pm 0.05

days, which is 9% lower than the value reported in the database. Based on our analysis, this difference has a significant impact on the determination of the number of ¹⁴⁶Eu atoms, and consequently has an equivalent impact on the measurement of ¹⁴⁶Sm half-life.

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短寿命核素146Eu的半衰期测定

sm是地质年代学和天体物理学应用的重要核素，其精确的半衰期值对精确的地质应用至关重要。然而，146Sm的半衰期测量值存在显著差异。提出了一种仅测量146Eu总量和146Sm衰变量的新实验方法，并研制了相应的α和γ光谱仪。在中国原子能科学研究院的HI-13串列加速器上进行了初步实验。根据α和γ的测量结果，对147Eu的半衰期进行了复核，结果与现有的半衰期测量值吻合较好，验证了半衰期测量系统的可靠性。146Eu的半衰期更新为4.21±0.05天，比数据库中报告的半衰期低9%。根据我们的分析，这种差异对146Eu原子数的测定有显著的影响，因此对146Sm半衰期的测定也有同等的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Physics A 物理-物理：核物理

CiteScore

3.60

自引率

7.10%

发文量

113

审稿时长

61 days

期刊介绍： Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.