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A Large-area two-dimensional scintillator detector with a wavelength-shifting fibre readout for a time-of-flight single-crystal neutron diffractometer

Nakamura, Tatsuya  ; Kawasaki, Takuro   ; Hosoya, Takaaki*; To, Kentaro  ; Oikawa, Kenichi   ; Sakasai, Kaoru  ; Ebine, Masumi ; Birumachi, Atsushi; Soyama, Kazuhiko  ; Katagiri, Masaki*

A two-dimensional scintillator-based neutron detector that has a neutron-sensitive area of 256 $$times$$ 256 mm$$^{2}$$ with a pixel size of 4 mm was developed. The detector was designed to be compact and modular with the smallest dead area for the SENJU time-of-flight Laue single-crystal diffractometer to be constructed in the Materials and Life Experimental Science Facility at the Japanese Proton Accelerator Research Complex. Two ZnS/$$^{10}{B}_{2}{O}_{3} $$ scintillator screens with an optimized scintillator thickness sandwiched the cross-arranged Wavelength-shifting fibre arrays to ensure a high detection efficiency for thermal neutrons. The prototype detector exhibited a detector efficiency of 40 $$pm$$ 1 % for 1.6-${AA}$ neutrons and a $$^{60}$$Co $$gamma$$-ray sensitivity of 6.0$$pm$$0.1 $$ times$$ $${10}^{-6}$$, which fulfilled the required detector specifications for SENJU.

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