标题： 衰减率测量$^{137}$铯在Jánossy地下研究实验室 显示英文标题

标题： Decay rate measurements $^{137}$Cs at Jánossy Underground Research Laboratory

摘要： 是否在核衰变率测量中可观测到年变化一直是研究的主题。 可能解释年变化的一个原因是太阳中微子的影响，其通量会随着地球与太阳之间距离的变化而变化。 目前在匈牙利Csillebérc的Jánossy地下研究实验室（距地面30米深）进行一项使用$^{137}$Cs源和HPGe探测器的衰变率测量。 该实验室是Vesztergombi高能实验室（VLAB）的一部分，是匈牙利TOP 50研究基础设施之一。 从2022年10月到2023年3月，已收集了六个月的数据，因此这是一个新的机会来检验是否可观测到衰变率的年变化。 本研究介绍了实验室、实验、数据处理方法以及初步结果。 显示英文摘要

摘要： The question whether an annual modulation is observable during nuclear decay rate measurements has long been the subject of research. One of the possible explanations for the annual variations would be the effect of solar neutrinos, the flux of which changes in correlation with the Earth-Sun distance. A decay rate measurement with a $^{137}$Cs source and a HPGe detector is currently being conducted 30 meters below the ground at J\'anossy Underground Research Laboratory (Csilleb\'erc, Hungary). The laboratory is part of the Vesztergombi High Energy Laboratory (VLAB), one of the TOP 50 research infrastructures in Hungary. From October 2022 to March 2023, data of six months' worth has been collected, and hence this is a new opportunity to check whether the annual variation in decay rate can be observed. The laboratory, the experiment, the data processing method, and the first results are presented in this study.