Measurement of the Anisotropic Response of the ZnWO4Crystal for Developing the Direction-Sensitive Dark Matter Detector

Koichi Ichimura; Hiroyuki Sekiya; Juan W. Pedersen; Akihiro Yamaji; Shunsuke Kurosawa

doi:10.1109/TNS.2020.2985027

Measurement of the Anisotropic Response of the ZnWO₄Crystal for Developing the Direction-Sensitive Dark Matter Detector

Koichi Ichimura, Hiroyuki Sekiya, Juan W. Pedersen, Akihiro Yamaji, Shunsuke Kurosawa

The University of Tokyo

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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.

Original language	English
Article number	9055121
Pages (from-to)	894-897
Number of pages	4
Journal	IEEE Transactions on Nuclear Science
Volume	67
Issue number	6
DOIs	https://doi.org/10.1109/TNS.2020.2985027
Publication status	Published - 2020 Jun

Keywords

Calibration measurement techniques
instrumentation and measurement
scintillators
solid scintillation detectors

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title = "Measurement of the Anisotropic Response of the ZnWO4Crystal for Developing the Direction-Sensitive Dark Matter Detector",

abstract = "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.",

keywords = "Calibration measurement techniques, instrumentation and measurement, scintillators, solid scintillation detectors",

author = "Koichi Ichimura and Hiroyuki Sekiya and Pedersen, {Juan W.} and Akihiro Yamaji and Shunsuke Kurosawa",

note = "Funding Information: Manuscript received February 8, 2020; accepted March 29, 2020. Date of publication April 2, 2020; date of current version June 19, 2020. This work was supported by JSPS KAKENHI under Grant JP15K13478, Grant JP17H02884, Grant JP17H05190, Grant JP19H02422, and Grant JP19H04684. Publisher Copyright: {\textcopyright} 1963-2012 IEEE.",

year = "2020",

month = jun,

doi = "10.1109/TNS.2020.2985027",

language = "English",

volume = "67",

pages = "894--897",

journal = "IEEE Transactions on Nuclear Science",

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AU - Ichimura, Koichi

AU - Sekiya, Hiroyuki

AU - Pedersen, Juan W.

AU - Yamaji, Akihiro

AU - Kurosawa, Shunsuke

N1 - Funding Information: Manuscript received February 8, 2020; accepted March 29, 2020. Date of publication April 2, 2020; date of current version June 19, 2020. This work was supported by JSPS KAKENHI under Grant JP15K13478, Grant JP17H02884, Grant JP17H05190, Grant JP19H02422, and Grant JP19H04684. Publisher Copyright: © 1963-2012 IEEE.

PY - 2020/6

Y1 - 2020/6

N2 - 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.

AB - 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.

KW - Calibration measurement techniques

KW - instrumentation and measurement

KW - scintillators

KW - solid scintillation detectors

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Measurement of the Anisotropic Response of the ZnWO₄Crystal for Developing the Direction-Sensitive Dark Matter Detector

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