论文标题
碳$^{14} $ c和tritium在Xenon1t中的背景来源
Carbon $^{14}$C and Tritium as possible background sources in XENON1T
论文作者
论文摘要
在这项工作中，碳$^{14} $ c和tritium在Xenon1t实验中被视为可能的背景来源。仿真结果表明，如果$^{14} $ C位于具有数十万微米的特征大小的灰尘颗粒中，则其β频谱被软化，并且可以为Xenon1t实验的频谱的低背景部分（最多20 keV）做出贡献。此外，已经表明，由于阈值效应和tri含量居住在Xenon中的形式，trium频谱也会显着扭曲。模拟结果与实验数据的比较使我们能够以约1500腐烂 / t /年的$^{14} $ c的活动水平估计，这给出了含有$^{14} $ C的有机杂质水平，其水平为2x10 $^{ - 13} $ g / g。在the虫背景的情况下，频谱失真已经是由纳米颗粒引起的。其中，坐在灰尘表面的trium的频谱的形状比纯trium的光谱更好地适合实验数据。此外，由于灰尘吸收了部分衰变的一部分，因此Xenon中的trium的总量可能比假设Xenon中的Pure Tritium的背景大几倍（该因子很大程度上取决于灰尘颗粒的大小）。
In this work, carbon $^{14}$C and Tritium were considered as possible background source in the XENON1T experiment. The simulation results show that if $^{14}$C is located in dust particles with a characteristic size of tens of micrometers, then its beta spectrum is softened and can contribute to the low-background part of the spectrum (up to 20 keV) of the XENON1T experiment. In addition, it has been shown that the tritium spectrum is also significantly distorted due to the threshold effect and the form in which tritium is living in xenon. Comparison of the simulation results with experimental data allowed us to estimate the activity level of $^{14}$C at about 1500 decays / t / year, which gives the level of organic impurities containing $^{14}$C at the level of 2x10$^{-13}$ g/g. In the case of tritium background, spectrum distortions are already caused by nanoparticles. Wherein the shape of the spectrum from tritium sitting on the surface of the dust fits better into the experimental data than the spectrum from pure tritium. In addition, since the dust absorbs part of the decays, the total amount of tritium in xenon can be several times greater than assuming a background from pure tritium in xenon (the factor strongly depends on the size of the dust particles).
