CDEX-10 实验首个 102.8kg×day 数据对弱相互作用大质量粒子的限制。

Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg×day Data of the CDEX-10 Experiment.

机构信息

Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084.

College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875.

出版信息

Phys Rev Lett. 2018 Jun 15;120(24):241301. doi: 10.1103/PhysRevLett.120.241301.

DOI:10.1103/PhysRevLett.120.241301

PMID:29956956

Abstract

We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 160 eVee, improved limits of 8×10^{-42} and 3×10^{-36} cm^{2} at a 90% confidence level on spin-independent and spin-dependent WIMP-nucleon cross sections, respectively, at a WIMP mass (m_{χ}) of 5 GeV/c^{2} are achieved. The lower reach of m_{χ} is extended to 2 GeV/c^{2}.

摘要

我们报告了 CDEX-10 实验中首次使用浸没在液氮中的 10 公斤锗探测器阵列进行的轻质量弱相互作用大质量粒子（WIMP）搜索的结果，该实验在中国锦屏地下实验室进行，物理数据量为 102.8 公斤·天。在分析阈值为 160 eVee 的情况下，在 WIMP 质量（mχ）为 5 GeV/c²时，分别在自旋无关和自旋相关 WIMP-核子截面处达到了 90%置信水平下的 8×10^{-42}和 3×10^{-36} cm^{2}的改进限制。mχ 的下限扩展到 2 GeV/c²。