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Evaluation of angular dependence of neutron detection efficiencies of ZnS scintillator detectors

Nakamura, Tatsuya  ; To, Kentaro  ; Kawasaki, Takuro   ; Honda, Katsunori; Suzuki, Hiroyuki; Ebine, Masumi ; Birumachi, Atsushi; Sakasai, Kaoru  ; Soyama, Kazuhiko  ; Katagiri, Masaki*

The detection efficiency of a ZnS-based neutron scintillator detector was evaluated as a function of the incident angle and the wavelength of a neutron. A pulsed neutron beam that has a wavelength from 1 to 8${AA}$ was incident to the test detector that implemented a ZnS/$$^{6}$$LiF and ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator that have thicknesses of 0.45 and of 0.20 mm, respectively. In each scintillator the detection efficiency increased as the incident angle increased for neutrons with a wavelength shorter than about 3${AA}$. A comparison between the experimental results and the model fitting are presented.

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