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Background caused by continuously emitted high-energy neutrons at the chopper spectrometer 4SEASONS

チョッパー型中性子分光器四季における高エネルギー中性子由来のバックグラウンド

梶本 亮一 ; 中村 充孝; 稲村 泰弘; 蒲沢 和也*; 池内 和彦*; 飯田 一樹*; 石角 元志*; 中島 健次 ; 原田 正英; 新井 正敏

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kamazawa, Kazuya*; Ikeuchi, Kazuhiko*; Iida, Kazuki*; Ishikado, Motoyuki*; Nakajima, Kenji; Harada, Masahide; Arai, Masatoshi

The background that appears in spectra acquired by the chopper spectrometer 4SEASONS at J-PARC was investigated. A continuous background that oscillates in synch with the rotation of the Fermi chopper was observed even when neutrons should be suppressed. The characteristics of the background strongly suggest that high-energy delayed neutrons continuously emitted from the mercury target are its cause.

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