论文标题
$^{40} $ k衰减方案的KDK测量的新型实验系统与罕见事件搜索相关
A novel experimental system for the KDK measurement of the $^{40}$K decay scheme relevant for rare event searches
论文作者
论文摘要
Potassium-40（$^{40} $ K）是一种长期存在的，天然存在的放射性同位素。衰减产品是许多罕见事件搜索的重要背景，包括涉及基于NAI的闪光灯的搜索。 $^{40} $ k也在地球学约会技术中发挥了作用。从未测量过电子捕获与氩40的基态的分支比率，这可能会导致解释某些结果的困难，或者根据现场和分析技术的不同，可能导致缺乏精度。 KDK（钾（K）衰减（DK））协作正在测量此衰减。复合方法具有硅漂移检测器，其中具有丰富的，热沉积的$^{40} $ K源内的模块化总吸收光谱仪。该设置的特征是能量校准，伽马标记效率，实时时间以及虚假的负面因素和积极因素。还讨论了一种互补的，同质的方法。它使用ksr $ _2 $ i $ _5 $：欧盟闪烁体作为来源和检测器。
Potassium-40 ($^{40}$K) is a long-lived, naturally occurring radioactive isotope. The decay products are prominent backgrounds for many rare event searches, including those involving NaI-based scintillators. $^{40}$K also plays a role in geochronological dating techniques. The branching ratio of the electron capture directly to the ground state of argon-40 has never been measured, which can cause difficulty in interpreting certain results or can lead to lack of precision depending on the field and analysis technique. The KDK (Potassium (K) Decay (DK)) collaboration is measuring this decay. A composite method has a silicon drift detector with an enriched, thermally deposited $^{40}$K source inside the Modular Total Absorption Spectrometer. This setup has been characterized in terms of energy calibration, gamma tagging efficiency, live time and false negatives and positives. A complementary, homogeneous, method is also discussed; it employs a KSr$_2$I$_5$:Eu scintillator as source and detector.
