Applicability of the two-angle differential method to response measurement of neutron-sensitive devices at the RCNP high-energy neutron facility

Masuda, Akihiko*; Matsumoto, Tetsuro*; Iwamoto, Yosuke   ; Hagiwara, Masayuki*; Satoh, Daiki   ; Sato, Tatsuhiko   ; Iwase, Hiroshi*; Yashima, Hiroshi*; Nakane, Yoshihiro  ; Nishiyama, Jun*; Shima, Tatsushi*; Tamii, Atsushi*; Hatanaka, Kichiji*; Harano, Hideki*; Nakamura, Takashi*

Quasi-monoenergetic high-energy neutron fields induced by Li(p,n) reactions are used for the response evaluation of neutron-sensitive devices. The quasi-monoenergetic high-energy field consists of high-energy monoenergetic peak neutrons and unwanted continuum neutrons down to the low-energy region. A two-angle differential method has been developed to compensate for the effect of the continuum neutrons in the response measurements. In this study, the two-angle differential method was demonstrated for Bonner sphere detectors, which are typical examples of moderator-based neutron-sensitive detectors, to investigate the method's applicability and its dependence on detector characteristics. Through this study, the adequacy of the two-angle differential method was experimentally verified, and practical suggestions were made pertaining to this method.