论文标题
碘化钠的宇宙激活
Cosmogenic activation of sodium iodide
论文作者
论文摘要
通过宇宙射线颗粒与碘化钠（NAI）晶体的相互作用来产生放射性同位素，可以在用于寻找罕见事件的检测器中产生放射性背景。通过与中子束对宇宙射线中子光谱相匹配的NAI晶体的受控辐照，然后直接计数并在广泛的能量范围内拟合所得的光谱，我们确定了几种长期寿命的放射性同位素的集成生产速率。然后将测量值推算以确定海平面的宇宙基因中子激活率，包括第一个实验性测定trium生产速率：$（80 \ pm 21）$ ATOMS/kg/kg/day。这些结果将有助于限制背景估计，并确定基于NAI的探测器在宇宙基础背景影响下一代实验的敏感性之前保持在地面上方的最大时间。
The production of radioactive isotopes by interactions of cosmic-ray particles with sodium iodide (NaI) crystals can produce radioactive backgrounds in detectors used to search for rare events. Through controlled irradiation of NaI crystals with a neutron beam that matches the cosmic-ray neutron spectrum, followed by direct counting and fitting the resulting spectrum across a broad range of energies, we determined the integrated production rate of several long-lived radioisotopes. The measurements were then extrapolated to determine the sea-level cosmogenic neutron activation rate, including the first experimental determination of the tritium production rate: $(80 \pm 21)$ atoms/kg/day. These results will help constrain background estimates and determine the maximum time that NaI-based detectors can remain unshielded above ground before cosmogenic backgrounds impact the sensitivity of next-generation experiments.
