The scintillation yields of ZnWO4crystals change depending on the incident direction of particles. This property can be used as a direction-sensitive dark matter detector. So, we investigated the ZnWO4light yields ratio of neutron-induced nuclear recoils to gamma-ray induced electron recoils(quenching factor). Two surfaces almost perpendicular to the crystal axis of ZnWO4were irradiated with a quasi-monochromatic neutron beam of 0.885MeV, and the quenching factors of both surfaces for the oxygen-nucleus recoil in the ZnWO4crystal were measured. The obtained quenching factors of the two surfaces were 0.235 ± 0.026 and 0.199 ± 0.020, respectively confirming 15.3% of anisotropy.
|Publication status||Published - 2019 Dec 20|
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