表面放射性杂质导致的KATRIN背景
KATRIN background due to surface radioimpurities
摘要：
卡尔斯鲁厄氚中微子（KATRIN）实验的目标是在90% C. L.时以0.2 eV/c $^2$的灵敏度测定有效电子反中微子质量。这个目标只能在非常低的背景水平下实现，大约每秒0.01个计数。一个可能的背景源是$α$ -KATRIN主光谱仪内表面的衰变。两个$α$ -源，$^{223}$ Ra和$^{228}$ Th，安装在KATRIN主光谱仪上，目的是暂时增加背景，以便研究$α$ -衰变诱导的背景过程。在本文中，我们提出了一个可能的背景产生机制和测量进行这两个放射源。我们的研究结果表明，$α$ -活动的内光谱仪表面和背景的体积的光谱仪之间有明确的相关性。主光谱仪背景的两个关键特征-对内部电极偏移电位的依赖性和径向分布-可以用这种人工诱导的背景再现。这些发现表明$α$衰变诱导的事件对残留KATRIN背景的贡献很大。
英文摘要：
The goal of the KArlsruhe TRItrium Neutrino (KATRIN) experiment is the determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c$^2$ at 90% C.L. This goal can only be achieved with a very low background level in the order of 0.01 counts per second. A possible background source is $α$-decays on the inner surface of the KATRIN Main Spectrometer. Two $α$-sources, $^{223}$Ra and $^{228}$Th, were installed at the KATRIN Main Spectrometer with the purpose of temporarily increasing the background in order to study $α$-decay induced background processes. In this paper, we present a possible background generation mechanism and measurements performed with these two radioactive sources. Our results show a clear correlation between $α$-activity on the inner spectrometer surface and background from the volume of the spectrometer. Two key characteristics of the Main Spectrometer background -the dependency on the inner electrode offset potential, and the radial distribution - could be reproduced with this artificially induced background. These findings indicate a high contribution of $α$-decay induced events to the residual KATRIN background.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
