论文标题
69GE，73SE，83SR，85MSR和63ZN放射性核素的半衰期高精度测量与天体物理P过程通过麦迪逊加速器实验室的光激活相关
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
论文作者
论文摘要
在85SR中的1/2-异构体的69GE，73SE，83SR，63ZN的基态半衰期使用光激活技术在非常规的Bremsstrahlung设施中以高精度测量，具有高精度，该设施具有重新推销的电子线性线性加速器。 G-ray活性被计数约6个半衰期，并带有高纯锗探测器，封闭在超低背景的铅屏蔽层中。测得的半衰期为：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）分钟。这些高精度的半寿命测量结果将有助于更准确地确定相应的地态光反应速率，这是限制计算与天体物理P过程相关的恒星核反应速率所需的更广泛努力的一部分。
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.
