NEWAGE is a direction-sensitive dark matter search using a low-pressure gaseous time projection chamber. A low alpha-ray emission rate micro pixel chamber had been developed in order to reduce background for dark matter search. We conducted the dark matter search at the Kamioka Observatory in 2018. The total live time was 107.6 d, corresponding to an exposure of 1.1 kg$\>$d. Two events remained in the energy region of 50–60 keV, which was consistent with the expected background of 2.5 events. A directional analysis was carried out and no significant forward–backward asymmetry derived from the WIMP-nucleus elastic scatterings was found. Thus a 90$\%$ confidence level upper limit on the spin-dependent WIMP-proton cross-section of 50 pb for a WIMP mass of 100 GeV$\>c^{-2}$ was derived. This limit is the most stringent yet obtained from direction-sensitive dark matter search experiments.

中文翻译：

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使用低背景气体探测器 NEWAGE-0.3b 进行方向敏感暗物质搜索”

NEWAGE 是一种使用低压气体时间投影室的方向敏感暗物质搜索。为了减少暗物质搜索的背景，开发了一种低 α 射线发射率微像素室。我们于 2018 年在神冈天文台进行了暗物质搜索，总生存时间为 107.6 d，对应的曝光量为 1.1 kg$\>$d。两个事件保持在 50-60 keV 的能量区域，这与 2.5 个事件的预期背景一致。进行了定向分析，没有发现源自 WIMP 核弹性散射的显着前后不对称性。因此，对于 100 GeV$\>c^{-2}$ 的 WIMP 质量，导出了 50 pb 的自旋相关 WIMP 质子横截面的 90$\%$ 置信水平上限。