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Report No.
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Background caused by continuously emitted high-energy neutrons at the chopper spectrometer 4SEASONS

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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