Background study of the AMoRE-pilot experiment

IF 4.2 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
A. Agrawal, V.V. Alenkov, P. Aryal, J. Beyer, B. Bhandari, R.S. Boiko, K. Boonin, O. Buzanov, C.R. Byeon, N. Chanthima, M.K. Cheoun, J.S. Choe, Seonho Choi, S. Choudhury, J.S. Chung, F.A. Danevich, M. Djamal, D. Drung, C. Enss, A. Fleischmann, Q. Yue
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引用次数: 0

Abstract

We report a study on the background of the Advanced Molybdenum-Based Rare process Experiment (AMoRE), a search for neutrinoless double beta decay (0νββ) of 100Mo. The pilot stage of the experiment was conducted using 1.9 kg of 48deplCa100MoO4 crystals at the Yangyang Underground Laboratory, South Korea, from 2015 to 2018. We compared the measured β/γ energy spectra in three experimental configurations with the results of Monte Carlo simulations and identified the background sources in each configuration. We replaced several detector components and enhanced the neutron shielding to lower the background level between configurations. A limit on the half-life of 0νββ decay of 100Mo was found at T1/20ν3.0×1023 years at 90% confidence level, based on the measured background and its modeling. Further reduction of the background rate in the AMoRE-I and AMoRE-II are discussed.

AMoRE 试点实验背景研究
我们报告了一项关于先进钼基稀有过程实验(AMoRE)背景的研究,该实验旨在寻找100Mo的无中子双β衰变(0νββ)。2015年至2018年,在韩国艳阳地下实验室使用1.9千克48deplCa100MoO4晶体进行了试验阶段的实验。我们将三种实验配置中测得的β/γ能谱与蒙特卡罗模拟结果进行了比较,并确定了每种配置中的背景源。我们更换了几个探测器部件,并加强了中子屏蔽,以降低配置间的背景水平。根据测量到的背景及其模型,在 90% 的置信度下,100Mo 的 0νββ 衰变半衰期限制为 T1/20ν≥3.0×1023年。讨论了在 AMoRE-I 和 AMoRE-II 中进一步降低本底率的问题。
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来源期刊
Astroparticle Physics
Astroparticle Physics 地学天文-天文与天体物理
CiteScore
8.00
自引率
2.90%
发文量
41
审稿时长
79 days
期刊介绍: Astroparticle Physics publishes experimental and theoretical research papers in the interacting fields of Cosmic Ray Physics, Astronomy and Astrophysics, Cosmology and Particle Physics focusing on new developments in the following areas: High-energy cosmic-ray physics and astrophysics; Particle cosmology; Particle astrophysics; Related astrophysics: supernova, AGN, cosmic abundances, dark matter etc.; Gravitational waves; High-energy, VHE and UHE gamma-ray astronomy; High- and low-energy neutrino astronomy; Instrumentation and detector developments related to the above-mentioned fields.
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