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arXiv 0712.1645hep-ex
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低质量WIMP暗物质与锗探测器在220 eV阈值下自旋无关和自旋相关耦合的新极限

New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV

TEXONO Collaboration, S. T. Lin

摘要:

用有效质量为5g的四通道超低能锗探测器,在效率为50%时,探测器的能量阈值为(220 ± 10)eV。这为质量低于10 GeV的WIMP暗物质提供了一个独特的探测器。在国胜实验室0.338公斤-天的数据采集实时时间下,导出了星系晕中WIMP的约束条件。改进的限制比以前的结果自旋无关的WIMP核子和自旋相关的WIMP中子截面的WIMP质量之间的3-6 GeV。预测了全尺寸实验的灵敏度。这种探测器技术使得新的中微子和暗物质实验可以利用未探索的亚千电子伏能量窗口。在第3版之后包括两个附录,以解决触发和选择效率以及其他问题。

英文摘要:

An energy threshold of (220+-10) eV was achieved at an efficiency of 50% with a four-channel ultra-low-energy germanium detector each with an active mass of 5 g. This provides a unique probe to WIMP dark matter with mass below 10 GeV. With a data acquisition live time of 0.338 kg-day at the Kuo-Sheng Laboratory, constraints on WIMPs in the galactic halo were derived. The limits improve over previous results on both the spin-independent WIMP-nucleon and the spin-dependent WIMP-neutron cross-sections for WIMP mass between 3-6 GeV. Sensitivities for full-scale experiments are projected. This detector technique makes the unexplored sub-keV energy window accessible for new neutrino and dark matter experiments. Two appendices are included after Version-3 to address questions raised on trigger and selection efficiencies as well as other issues.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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