High‑precision measurements of half‐lives for 69Ge, 73Se, 83Sr, 85mSr, and 63Zn radionuclides relevant to the astrophysical p‑process via photoactivation at the Madison Accelerator Laboratory
High‑precision measurements of half‐lives for 69Ge, 73Se, 83Sr, 85mSr, and 63Zn radionuclides relevant to the astrophysical p‑process via photoactivation at the Madison Accelerator Laboratory
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在麦迪逊加速器实验室通过光活化对与天体物理过程相关的 69Ge、73Se、83Sr、85mSr 和 63Zn 放射性核素的半衰期进行高精度测量
DOI：
10.1007/s10967-020-07589-5
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Banu, A.
中科院分区：
文献类型：
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作者：
hain, T. A.;Pendeton, J. A.;Silano, S. A.;Banu, A.
69 Ge，73 Se，83 Sr，63 Zn的基态半衰期和85 Sr的1/2−异构体的半衰期已经在一个非传统的韧致辐射设施中使用光活化技术进行了高精度测量，该设施具有重新使用的医用电子线性加速器。在大约6个半衰期内，用高纯度锗探测器对γ射线活性进行计数，探测器封闭在超低本底铅屏蔽中。测得的半衰期分别为：T1/2（~（69）Ge）= 38.82 ± 0.07（stat）± 0.06（sys）h，T1/2（~（73）Se）= 7.18 ± 0.02（stat）± 0.004（sys）h，T1/2（~（83）Sr）= 31.87 ± 1.16（stat）± 0.42（sys）h，T1/2（~（85）mSr）= 68.24 ± 0.84（stat）± 0.11（sys）min。T1/2（63 Zn）= 38.71 ± 0.25（stat）± 0.10（sys）min。这些高精度的半衰期测量将有助于更准确地确定相应的基态光中子反应速率，这是限制统计核模型的更广泛努力的一部分，该模型需要计算与天体物理过程核合成相关的恒星核反应速率。
The ground state half-lives of69Ge,73Se,83Sr,63Zn, and the half-life of the 1/2−isomer in85Sr have been measured with high precision using the photoactivation technique at an unconventional bremsstrahlung facility that features a repurposed medical electron linear accelerator. Theγ-ray activity was counted over about 6 half-lives with a high-purity germanium detector, enclosed into an ultra low-background lead shield. The measured half-lives are:T1/2(69Ge) = 38.82 ± 0.07 (stat) ± 0.06 (sys) h;T1/2(73Se) = 7.18 ± 0.02 (stat) ± 0.004 (sys) h;T1/2(83Sr) = 31.87 ± 1.16 (stat) ± 0.42 (sys) h;T1/2(85mSr) = 68.24 ± 0.84 (stat) ± 0.11 (sys) min;T1/2(63Zn) = 38.71 ± 0.25 (stat) ± 0.10 (sys) min. These high-precision half-life measurements will contribute to a more accurate determination of corresponding ground-state photoneutron reaction rates, which are part of a broader effort of constraining statistical nuclear models needed to calculate stellar nuclear reaction rates relevant for the astrophysicalp-process nucleosynthesis.