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

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• 作者：Akihiko Masuda^a ; ^{aki-masuda@aist.go.jp} ; Tetsuro Matsumoto^a ; Yosuke Iwamoto^b ; Masayuki Hagiwara^c ; Daiki Satoh^b ; Tatsuhiko Sato^b ; Hiroshi Iwase^c ; Hiroshi Yashima^d ; Yoshihiro Nakane^b ; Jun Nishiyama^e ; Tatsushi Shima^f ; Atsushi Tamii^f ; Kichiji Hatanaka^f ; Hideki Harano^a ; Takashi Nakamura^g
• 关键词：Quasi-monoenergetic neutron field ; 7Li(p ; n) reaction ; Time of flight ; Bonner sphere ; Calibration ; Dosemeter
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：21 March 2017
• 年：2017
• 卷：849
• 期：Complete
• 页码：94-101
• 全文大小：1486 K
• 卷排序：849

文摘

Quasi-monoenergetic high-energy neutron fields induced by 7Li(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. Experiments were performed under 96–387 MeV quasi-monoenergetic high-energy neutron fields at the Research Center for Nuclear Physics (RCNP), Osaka University. The measurement results for large high-density polyethylene (HDPE) sphere detectors agreed well with Monte Carlo calculations, which verified the adequacy of the two-angle differential method. By contrast, discrepancies were observed in the results for small HDPE sphere detectors and metal-induced sphere detectors. The former indicated that detectors that are particularly sensitive to low-energy neutrons may be affected by penetrating neutrons owing to the geometrical features of the RCNP facility. The latter discrepancy could be consistently explained by a problem in the evaluated cross-section data for the metals used in the calculation. Through those discussions, the adequacy of the two-angle differential method was experimentally verified, and practical suggestions were made pertaining to this method.