We measured the scintillation light yield of ZnWO4 crystals using a quasi-monochromatic neutron beam energy of 865 keV. Irradiating the neutron beam on two surfaces, which are almost perpendicular to the crystal axis, the light yield of oxygen recoil was measured. The obtained light yield ratio of a neutron recoil to gamma-ray-induced electron recoil for two surfaces was 0.235 ± 0.026 and 0.199 ± 0.020, respectively, which corresponds to 15.3% of anisotropy for ~200-keV nuclear recoils of this crystal. This property can be applied to a direction-sensitive dark matter (DM) detector.

中文翻译：

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用于开发方向敏感暗物质探测器的 ZnWO4 晶体各向异性响应的测量。

我们使用 865 keV 的准单色中子束能量测量了 ZnWO4 晶体的闪烁光产额。将中子束照射在几乎垂直于晶轴的两个表面上，测量氧反冲的光产额。获得的两个表面的中子反冲与伽马射线诱导的电子反冲的光产率分别为 0.235±0.026 和 0.199±0.020，对应于该晶体~200 keV 核反冲的各向异性的 15.3%。此属性可应用于方向敏感的暗物质 (DM) 探测器。