Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment

Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment
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DOI:
10.1103/physrevlett.123.031302
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发表时间:
2019-07-16
影响因子:
8.6
通讯作者:
Yu, G. H.
Yu, G. H.
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Adhikari, G.;Adhikari, P.;Yu, G. H.

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我们提出了新的限制暗物质引起的年度调制信号使用1.7年的COSINE-100数据,总曝光量为97.7公斤。COSINE-100实验由106公斤NaI(Tl)靶材料组成,旨在通过使用相同的NaI(Tl)靶搜索相同的年度调制信号,对DAMA/LIBRA发现WIMP的声明进行模型独立测试。晶体数据显示,在2-6 keV的能量范围内,平均背景速率为2.7 cpd/kg/keV。使用卡方最小化方法,我们观察到调制幅度和相位的最佳拟合值分别为0.0092 +/- 0.0067 cpd/kg/keV和127.2 +/- 45.9 d。
We present new constraints on the dark matter-induced annual modulation signal using 1.7 years of COSINE-100 data with a total exposure of 97.7 kg yr. The COSINE-100 experiment, consisting of 106 kg of NaI(Tl) target material, is designed to carry out a model-independent test of DAMA/LIBRA's claim of WIMP discovery by searching for the same annual modulation signal using the same NaI(Tl) target. The crystal data show a 2.7 cpd/kg/keV background rate on average in the 2-6 keV energy region of interest. Using a chi-squared minimization method we observe best fit values for modulation amplitude and phase of 0.0092 +/- 0.0067 cpd/kg/keV and 127.2 +/- 45.9 d, respectively.