Measurement of high-energy neutron fluxes and spectra around the J-PARC mercury spallation neutron target using multi-foil activation method
春日井 好己; 原田 正英; 甲斐 哲也 ; 大井 元貴; 明午 伸一郎; 前川 藤夫
Kasugai, Yoshimi; Harada, Masahide; Kai, Tetsuya; Oi, Motoki; Meigo, Shinichiro; Maekawa, Fujio
The high-energy neutron fluxes and spectra around the mercury spallation neutron source at MLF of J-PARC were measured by the multi-foil activation method. The threshold energies of neutron reactions utilized in this experiment covered from 0.1 to 50 MeV. The foil irradiation was carried out on the first beam-run of MLF from May 30th to 31th, 2008. After the irradiation, the induced radioactivity of each foil was measured using an HPGe detector, and the neutron-induced reaction-rate distribution around the mercury target was determined. Using these data, the high-energy neutron fluxes and spectra were deduced with unfolding method in which the neutron spectra calculated with PHITS code were used as the initial-guess spectra. By comparison between the initial and the unfolded spectra, it was shown that most of the calculation results, which had been the basis of the neutronics design of the MLF target assembly, were consistent with the experimental data within $$pm$$30%.
使用言語 : English
報告書番号 : JAEA-Data/Code 2015-033
ページ数 : 28 Pages
発行年月 : 2016/03
特許データ :
論文URL :
キーワード : J-PARC; MLF; Neutron Source; Mercury; Spallation Reactions; Threshold Reaction Rate; High-Energy Neutron Spectra; Multi-foil Activation Method; PHITS; Unfolding
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広報プレスリリース :
受委託・共同研究相手機関 :
登録番号 : DC20150033
抄録集掲載番号 : 44000642
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