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Kasugai, Yoshimi; Harada, Masahide; Kai, Tetsuya; Oi, Motoki; Meigo, Shinichiro; Maekawa, Fujio
JAEA-Data/Code 2015-033, 28 Pages, 2016/03
JAEA-Data-Code-2015-033.pdf:1.78MB
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 
30%.
Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.
Nuclear Instruments and Methods in Physics Research A, 562(2), p.789 - 792, 2006/06
Times Cited Count：6 Percentile：43.85(Instruments & Instrumentation)Neutron energy spectra produced from thick targets play an important role in validation of calculation codes that are employed in the design of spallation neutron sources and the shielding design of accelerator facilities. However, appropriate experimental data were scarce in the forward direction for the incident energy higher than 100 MeV. In this study, neutron spectra at 0 degree from thick targets bombarded with 350 MeV protons were measured by the time-of-flight technique using an NE213. The targets used were graphite, Al, Fe and Pb and their thicknesses were chosen to be a little thicker than the stopping lengths. The experiment was carried out at the TOF course of the RCNP (Research Center of Nuclear Physics) ring cyclotron, Osaka University. The flight path length between center of the target and of an NE213 were 11.4 m for the measurement of low energy neutrons and 95 m for high energy neutrons. The experimental data are compared with the calculated results by using the Monte Carlo transport codes, such as MCNPX and PHITS codes.
Yoshizawa, Michio; Tanimura, Yoshihiko; Saegusa, Jun; Nemoto, Hisashi*; Yoshida, Makoto
Radiation Protection Dosimetry, 110(1-4), p.81 - 84, 2004/09
Times Cited Count：3 Percentile：23.52(Environmental Sciences)The facility of Radiation Standards (FRS) of JAERI has equipped with the concrete-moderated neutron calibration fields as simulated workplace neutron fields. The fields use an Am-Be (37GBq) neutron source placed in the narrow space surrounded by concrete wall and bricks to produce scattered neutrons. The neutron spectra of the fields were measured with Bonner multi-sphere spectrometer system (BMS), spherical recoil-proton proportional counters (RPCs), and a liquid scintillation counter (NE-213). The results were compared with each other, and the neutron spectra and the ambient dose equivalent rate, 
(10), were agreed well within the uncertainty. The angular distributions of neutron fluence were calculated by the MCNP-4B2 Monte Carlo code to obtain the reference personal dose equivalent rate, 
(10). The calculated results show that the scattered neutrons have a wide variety of incident angles. The reference (10) values considered the angular distribution were found to be 10-18% smaller than those without consideration.
Ioka, Ikuo; Yonekawa, Minoru; Miwa, Yukio; Mimura, Hideaki; Tsuji, Hirokazu; Hoshiya, Taiji
Journal of Nuclear Materials, 283-287(Part.1), p.440 - 445, 2000/12
Times Cited Count：7 Percentile：46.88(Materials Science, Multidisciplinary)no abstracts in English
particles by quantum molecular dynamics plus statistical decay modelMeigo, Shinichiro; Chiba, Satoshi; Shin, Kazuo*
Journal of Nuclear Science and Technology, 36(3), p.250 - 255, 1999/03
Times Cited Count：1 Percentile：13.15(Nuclear Science & Technology)no abstracts in English
Okajima, Shigeaki
Kaku Deta Nyusu (Internet), (56), p.190 - 193, 1997/00
no abstracts in English
Tanaka, Susumu; Nakashima, Hiroshi; Nakane, Yoshihiro; Sakamoto, Yukio; Meigo, Shinichiro; Tanaka, Shunichi; Takada, Masashi*; Kurosawa, Tadahiro*; Nakamura, Takashi*; Nakao, Noriaki*; et al.
Genshikaku Kenkyu, 41(3), p.101 - 112, 1996/06
no abstracts in English
Takada, Hiroshi
Journal of Nuclear Science and Technology, 33(4), p.275 - 282, 1996/04
Times Cited Count：19 Percentile：81.69(Nuclear Science & Technology)no abstracts in English
Shimakawa, Satoshi; ; Nagao, Yoshiharu;
JAERI-Tech 95-023, 26 Pages, 1995/03
no abstracts in English
Nagao, Yoshiharu; Shimakawa, Satoshi; ;
JAERI-Tech 95-006, 46 Pages, 1995/02
no abstracts in English
Hishinuma, Akimichi
Purazuma, Kaku Yugo Gakkai-Shi, 70(7), p.719 - 725, 1994/07
no abstracts in English
Cs(n,
)
CsSekine, Toshiaki; ; Kobayashi, Katsutoshi; Harada, Hideo*; Watanabe, Hisashi*; Kato, Toshio*
Journal of Nuclear Science and Technology, 30(11), p.1099 - 1106, 1993/11
Times Cited Count：27 Percentile：90.21(Nuclear Science & Technology)no abstracts in English
Suzuki, Masatoshi; *; Ichikawa, Hiroki
JAERI-M 92-201, 17 Pages, 1993/01
no abstracts in English
B.Yu*; Chiba, Satoshi; Fukahori, Tokio
Journal of Nuclear Science and Technology, 29(7), p.677 - 689, 1992/07
no abstracts in English
Cs(n,)CsSekine, Toshiaki; ; Kobayashi, Katsutoshi; Harada, Hideo*; Watanabe, Hisashi*; Kato, Toshio*
Proc. of the Nuclear Data for Science and Technology, p.57 - 58, 1992/00
no abstracts in English
Masukawa, Fumihiro; Nakagawa, Tsuneo; Iijima, Shungo*
Journal of Nuclear Science and Technology, 27(6), p.572 - 576, 1990/06
no abstracts in English
; Akino, Fujiyoshi;
Journal of Nuclear Science and Technology, 25(9), p.673 - 681, 1988/09
Times Cited Count：8 Percentile：64.94(Nuclear Science & Technology)no abstracts in English
; ; ; ; ; *; *
JAERI-M 84-193, 34 Pages, 1984/10
no abstracts in English
*;
JAERI-M 82-091, 67 Pages, 1982/07
no abstracts in English
Journal of Nuclear Science and Technology, 17(6), p.471 - 473, 1980/00
Times Cited Count：0 Percentile：0.29(Nuclear Science & Technology)no abstracts in English
