麦迪逊加速器实验室通过光活化对与天体物理学p过程有关的69 Ge、73 Se、83 Sr、85 mSr和63 Zn放射性核素半衰期的高精度测量
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
摘要：
利用光活化技术，在一个非常规的韧致辐射实验装置上，利用一台改装的医用电子直线加速器，高精度地测量了~（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。在大约6个半衰期内，用封闭在超低背景铅屏蔽中的高纯度锗探测器对g射线活动进行计数。测量的半衰期为：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（静态）+/- 0.11（系统）min; T1/2（63 Zn）= 38.71 +/- 0.25（stat）+/- 0.10（sys）min。这些高精度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，这是一个更广泛的努力的一部分，约束统计核模型需要计算恒星核反应速率相关的天体物理p-过程核合成。
英文摘要：
The ground state half-lives of 69Ge, 73Se, 83Sr, 63Zn, and the half-life of the 1/2- isomer in 85Sr have been measured with high precision using the photoactivation technique at an unconventional bremsstrahlung facility that features a repurposed medical electron linear accelerator. The g-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 astrophysical p-process nucleosynthesis.
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