Preparation and measurement of an $\rm ^{37}$Ar source for liquid xenon detector calibration
Xu-Nan Guo, Chang Cai, Fei Gao, Yang Lei, Kai-Hang Li, Chun-Lei Su, Ze-Peng Wu, Xiang Xiao, Ling-Feng Xie, Yi-Fei Zhao, Xiao-Peng Zhou
公開日: 2025/9/5
Abstract
We present the preparation and measurement of the radioactive isotope $\rm ^{37}Ar$, which was produced using thermal neutrons from a reactor, as a calibration source for liquid xenon time projection chambers. $\rm ^{37}Ar$ is a low-energy calibration source with a half-life of 35.01 days, making it suitable for calibration in the low-energy region of liquid xenon dark-matter experiments. Radioactive isotope $\rm ^{37}Ar$ was produced by irradiating $\rm ^{36}Ar$ with thermal neutrons. It was subsequently measured in a gaseous xenon time projection chamber (GXe TPC) to validate its radioactivity. Our results demonstrate that $\rm ^{37}Ar$ is an effective and viable calibration source that offers precise calibration capabilities in the low-energy domain of xenon-based detectors.