A direct dark matter search in XMASS-I
A direct dark matter search in XMASS-I
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DOI：
10.1016/j.physletb.2018.10.070
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发表时间：
2015-11
影响因子：
4.4
通讯作者：
M. Yamashita
中科院分区：
文献类型：
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作者：
M. Yamashita
日本神冈天文台利用地下单相液态氙探测器对暗物质进行了搜索，特别是对弱相互作用大质量粒子（wimp）进行了搜索。我们已经使用了705.9天的数据，在探测器中心的一个包含97公斤液态氙的基准体积中。数据缩减后基准体积内的事件率为（4.2±0.2）× 10−3 day−1 kg−1 ke V ee−1，在5 ke V ee时，信号效率为20%。其余所有事件都与我们的背景评估一致，大多数“错误重建事件”来自探测器内表面衬里铜板中的210 Pb。当WIMP质量为60 GeV/ c2时，在90%的置信水平下，得到的自旋无关WIMP-核子截面的上限为2.2× 10−44 cm 2，这是单相液态氙探测器结果中最严格的上限。
A search for dark matter using an underground single-phase liquid xenon detector was conducted at the Kamioka Observatory in Japan, particularly for Weakly Interacting Massive Particles (WIMPs). We have used 705.9 live days of data in a fiducial volume containing 97 kg of liquid xenon at the center of the detector. The event rate in the fiducial volume after the data reduction was (4.2±0.2)× 10− 3 day− 1 kg− 1 ke V ee− 1 at 5 ke V ee, with a signal efficiency of 20%. All the remaining events are consistent with our background evaluation, mostly of the “mis-reconstructed events” originated from 210 Pb in the copper plates lining the detector's inner surface. The obtained upper limit on a spin-independent WIMP-nucleon cross section was 2.2× 10− 44 cm 2 for a WIMP mass of 60 GeV/c 2 at the 90% confidence level, which was the most stringent limit among results from single-phase liquid xenon detectors.