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波長シフトファイバを用いた高検出効率,高位置分解能型2次元シンチレータ中性子検出器の開発研究; J-PARC/MLF生命物質構造解析装置「iBIX」のためのコンパクト型検出器の開発

Development of two-dimensional scintillator neutron detector using wavelength-shifting fibres; Development of a compact detector for iBIX instrument in J-PARC/MLF

中村 龍也; 片桐 政樹; 細谷 孝明*; 美留町 厚; 海老根 守澄; 曽山 和彦; Schooneveld, E.*; Rhodes, N.*

Nakamura, Tatsuya; Katagiri, Masaki; Hosoya, Takaaki*; Birumachi, Atsushi; Ebine, Masumi; Soyama, Kazuhiko; Schooneveld, E.*; Rhodes, N.*

J-PARC/MLFの生命物質構造解析装置に実機として供与することのできる波長シフトファイバを用いた高検出効率,高位置分解能型2次元シンチレータ中性子検出器を開発した。検出器を構成する各要素について当該装置仕様に基づいて最適化し高性能化を図った。有感面積13.3$$times$$13.3cm$$^{2}$$,不感面積率30%以下であるコンパクトなプロトタイプ検出器を試作しISISパルス中性子源にてその動作性能を確認した。開発した2次元検出器は当該装置に要求された仕様をほぼ満足するものであった。

A compact two-dimensional neutron detector was developed for iBIX instrument in the J-PARC/MLF. The specifications required for the detector were a spatial resolution of less than 1 mm, a detector efficiency of more than 50% for thermal neutrons, a $$gamma$$ sensitivity of less than 10$$^{6}$$, detector coverage of around 15$$times$$15 cm$$^{2}$$ with least dead area, compactness, modularity, and a pulse pair resolution of less than 2 $$mu$$s. The detector components were studied in detail and optimized for the purpose. The compact prototype detector that has a neutron sensitive area of 13.3$$times$$13.3 cm$$^{2}$$ was made and feasibility of the detector was demonstrated successfully in the experiments at the ISIS pulsed neutron source.

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