论文标题
$^{37} $ ar的宇宙生产在Lux-Zeplin实验的背景下
Cosmogenic production of $^{37}$Ar in the context of the LUX-ZEPLIN experiment
论文作者
论文摘要
我们估计通过宇宙射线诱导的散布生产的$^{37} $ ar的量,这是Xenon在地球表面上运输和存储的必然结果。然后,我们在10吨有效载荷(类似于Lux-Zeplin实验的$^{37} $ ar浓度下计算产生的$^{37} $ AR浓度,假设Xenon纯化,存储和交付给地下设施的代表性时间表。使用Silberberg和Tsao的散布模型,估计在天然Xenon中的$^{37} $ AR的海平面生产率估计为0.024〜Atoms/kg/day。假设氙气已连续纯化以在1吨批处理中以1〜吨/月的速率去除放射性污染物,则在10吨后的平均$^{37} $ AR活动被纯化并在地下运输为0.058---0.090〜 $ $ $ $ $ $ bq/kg,具体取决于代价putifutive of Argon putifutive of Argon Putifitifutive of Argefiviatival of Argefiviative of Ardefter offiviative offifitive offiviative of Ardecrove offiviative。这种宇宙基因$^{37} $ ar将在早期科学数据中出现明显的背景,同时以35〜天的半衰期衰减。在计划未来的基于液体氙气实验时,应考虑这种新闻$^{37} $ AR的新生产机制。
We estimate the amount of $^{37}$Ar produced in natural xenon via cosmic ray-induced spallation, an inevitable consequence of the transportation and storage of xenon on the Earth's surface. We then calculate the resulting $^{37}$Ar concentration in a 10-tonne payload~(similar to that of the LUX-ZEPLIN experiment) assuming a representative schedule of xenon purification, storage and delivery to the underground facility. Using the spallation model by Silberberg and Tsao, the sea level production rate of $^{37}$Ar in natural xenon is estimated to be 0.024~atoms/kg/day. Assuming the xenon is successively purified to remove radioactive contaminants in 1-tonne batches at a rate of 1~tonne/month, the average $^{37}$Ar activity after 10~tonnes are purified and transported underground is 0.058--0.090~$μ$Bq/kg, depending on the degree of argon removal during above-ground purification. Such cosmogenic $^{37}$Ar will appear as a noticeable background in the early science data, while decaying with a 35~day half-life. This newly-noticed production mechanism of $^{37}$Ar should be considered when planning for future liquid xenon-based experiments.