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Meigo, Shinichiro; Yamaguchi, Yuji; Nakano, Keita*; Sugihara, Kenta*
Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.132 - 136, 2023/01
J-PARC accelerator facility is the only accelerator facility in Japan that can provide proton beams in the energy range of 400 MeV or higher. In the J-PARC accelerator facility, it is difficult to install users' experimental equipment inside the proton beam duct in order to maintain stable user operation. In addition, due to the characteristics of the synchrotron accelerator, it is not possible to supply a low-intensity beam enough to confirm the detector. In addition, it is important to improve the intranuclear cascade model (INCL) for high-intensity proton accelerator facilities such as accelerator-driven transmutation systems (ADS), etc. In order to improve the INCL, DDX of the forward-most emitted particles is important, but new data should be obtained since there are few experimental data available. In order to promote space utilization and to improve the accuracy of the INCL, energy spectra of scattered protons at the Al beam window placed at the inlet of the 3NBT dump were measured. In the experiment, plastic scintillators were used with 400 MeV proton beam. The results show that the spectra have sharp peaks due to elastic scattering. The calculation of the PHITS code using INCL reproduced the sharp peak due to elastic scattering well, although it overestimated the contribution of quasi-elastic scattering in the experimental data. In conclusion, it is clear that the present method can be used to utilize protons in several GeV regions for space exploration.
Okumura, Taiga*; Yamaguchi, Noriko*; Dohi, Terumi; Iijima, Kazuki; Kogure, Toshihiro*
Microscopy, 68(3), p.234 - 242, 2019/06
Times Cited Count：11 Percentile：63.81(Microscopy)Radiocesium-bearing microparticles (CsMPs), consisting substantially of silicate glass, were released to the environment during the Fukushima nuclear accident in March 2011. We investigated a total of nine CsMPs using transmission electron microscopy (TEM) and inferred the atmosphere in the reactors during the accident. From elemental mapping using energy-dispersive X-ray spectrometry, Fe and Zn showing radial inhomogeneities were found in the CsMPs, in addition to the Cs that had been previously reported. Four of the CsMPs included submicron crystals, which were identified as chromite, franklinite, acanthite, molybdenite, and hessite. The chromium-containing spinels, chromite and franklinite, indicated the presence of ferrous iron (Fe
), suggesting that the inside of the reactors was reductive to some extent. Electron energy-loss spectroscopy also confirmed that the CsMPs did not contain boron, and therefore the atmosphere in which they were formed might be boron-free.
Iwamoto, Hiroki; Meigo, Shinichiro
EPJ Web of Conferences, 153, p.01016_1 - 01016_9, 2017/09
Times Cited Count：3 Percentile：83.73(Nuclear Science & Technology)Center for Neutron Science; Advanced Science Research Center
JAERI-Review 2002-002, 40 Pages, 2002/03
JAERI-Review-2002-002.pdf:4.03MB
no abstracts in English
Yamazaki, H.*; Yabashi, Makina*; Tamasaku, Kenji*; Yoneda, Yasuhiro; Goto, Shunji*; Mochizuki, Tetsuro*; Ishikawa, Tetsuya*
Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.643 - 646, 2001/07
Times Cited Count：8 Percentile：51.65(Instruments & Instrumentation)no abstracts in English
Akiniwa, Yoshiaki*; Tanaka, Keisuke*; Minakawa, Nobuaki; Morii, Yukio
Materials Science Research International, Special Technical Publication, 1, p.427 - 430, 2001/05
no abstracts in English
X.Huang*; Arai, Hidehiko; Matsuhashi, Shimpei; Miyata, Teijiro
Chemistry Letters, 0(4), p.273 - 274, 1996/00
no abstracts in English
X.Huang*; Arai, Hidehiko; Matsuhashi, Shimpei; Miyata, Teijiro
Chemistry Letters, 0(2), p.159 - 160, 1996/00
no abstracts in English
Onuki, Akira; ; Murao, Yoshio
Journal of Nuclear Science and Technology, 29(3), p.223 - 232, 1992/03
no abstracts in English
Nishiyama, Yutaka; Fukaya, Kiyoshi; Suzuki, Masahide; Kodaira, Tsuneo; Oku, Tatsuo*
Effects of Radiation on Materials; 15th International Symposium (ASTM STP 1125), p.1287 - 1303, 1992/00
no abstracts in English
;
Proc. of the Int. Symp. on Material Chemistry in Nuclear Environment, p.497 - 506, 1992/00
no abstracts in English
M.Z.Hasan*; Kunugi, Tomoaki
Heat Transfer-Minneapolis,1991 (AIChE Symp. Ser. No. 283), p.67 - 73, 1991/00
no abstracts in English
; ; Murao, Yoshio
Nucl.Eng.Des., 107, p.283 - 294, 1988/00
Times Cited Count：65 Percentile：97.56(Nuclear Science & Technology)no abstracts in English
Journal of Nuclear Science and Technology, 23(3), p.219 - 232, 1986/00
no abstracts in English
; ; ;
Nuclear Instruments and Methods, 188, p.63 - 68, 1981/00
no abstracts in English
;
Journal of Nuclear Science and Technology, 5(7), p.374 - 376, 1968/00
Times Cited Count：0no abstracts in English
Akashi, Masatoshi; Morimoto, Kyoichi
no journal, ,
Matsuda, Hiroki; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio
no journal, ,
For the improvement of nuclear design for Accelerator-Driven System (ADS), production cross section with higher accuracy is required. For data acquisition around 1 GeV energy range at J-PARC, protons having energy 0.4 to 3.0 GeV were irradiated on metal samples such as carbon and beryllium. Experiment and analysis methods were employed that were presented in the AESJ2018 autumn meeting. They were compared with the evaluated data (JENDL-HE/2007), the calculated one by PHITS code, and the one by the latest intranuclear cascade model INCL++ and a statistical decay model ABLA07. It was found that the cross section of 
and 
in this experiment has higher accuracy (approx. 7%) than other experiments due to precise beam control at J-PARC. JENDL/HE-2007 in which reaction is stored among light nuclides agreed with these results and other experiments within 9% uncertainty. PHITS calculation also showed a good agreement over the whole energy range. Especially PHITS in which the original GEM model was implemented, showed better agreement above 1 GeV range. Though the INCL++/ABLA07 calculations excellently agree with the experiments, the calculation overestimated over the whole range. In reaction, new experimental data were obtained around few GeV range. It was found that the calculation underestimated about 20 - 50% over the whole range.
Matsuda, Hiroki; Takeshita, Hayato*; Meigo, Shinichiro; Iwamoto, Hiroki
no journal, ,
For the improvement of nuclear design for Accelerator-Driven System (ADS), a production cross-section with higher accuracy is required. For data acquisition around 1 GeV energy range at J-PARC, protons in the energy region from 0.4 to 3.0 GeV were irradiated on Ag and Ta. Experiment and analysis methods were employed that were presented in the AESJ2018 autumn meeting. They were compared with the calculated data by PHITS code, and the one by the latest intranuclear cascade model INCL++ and a statistical decay model ABLA07. It was found that calculations for the 
Ag, 
Kr, and 
Be production cross-sections with INCL-4.6/GEM, Bertini/GEM, and INCL-6.0/ABLA07 could predict the experimental data within a factor 0.5 to 2. On the other hand, in the case of 
Na, 
Na, and 
Rh cross sections, all calculations showed huge overestimation or underestimation. In order to increase lighter nuclides such as Be and Na, we adopted a statistical multifragmentation model in the calculation. Although the calulcation was slightly improved still it has a large discrepancy in the experiment. Thus, a modification of the intra-nuclear cascade model was required, which is to be performed.
