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Yoshida, Junya; Akaishi, Takaya; Fujita, Manami; Hasegawa, Shoichi; Hashimoto, Tadashi; Hosomi, Kenji; Ichikawa, Masaya; Ichikawa, Yudai; Imai, Kenichi*; Kim, S.; et al.
JPS Conference Proceedings (Internet), 33, p.011112_1 - 011112_8, 2021/03
Kim, S. H.*; Ichikawa, Yudai; Sako, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei*; Nanamura, Takuya*; Sato, Susumu; Tanida, Kiyoshi; Yoshida, Junya; 11 of others*
Nuclear Instruments and Methods in Physics Research A, 940, p.359 - 370, 2019/10
Times Cited Count：5 Percentile：48.99(Instruments & Instrumentation)Ekawa, Hiroyuki; Ashikaga, Sakiko; Hasegawa, Shoichi; Hashimoto, Tadashi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Kimbara, Shinji*; Nanamura, Takuya; et al.
Progress of Theoretical and Experimental Physics (Internet), 2019(2), p.021D02_1 - 021D02_11, 2019/02
Times Cited Count：25 Percentile：83.76(Physics, Multidisciplinary)
hyperon capture at rest in nuclear emulsionTheint, A. M. M.*; Ekawa, Hiroyuki; Yoshida, Junya; 7 of others*
Progress of Theoretical and Experimental Physics (Internet), 2019(2), p.021D01_1 - 021D01_10, 2019/02
Times Cited Count：6 Percentile：48.1(Physics, Multidisciplinary)Kimbara, Shinji*; Ekawa, Hiroyuki; Hayakawa, Shuhei; Yoshida, Junya; 12 of others*
Progress of Theoretical and Experimental Physics (Internet), 2019(1), p.011H01_1 - 011H01_9, 2019/01
Times Cited Count：4 Percentile：36.66(Physics, Multidisciplinary)A development has been achieved in the identification method of the charges 1 to 5 of nuclides from the decay of double hypernuclei to be uniquely recognized by their nuclear species. The method is basically the measurement of track volume by the widths, depths, and angles of tracks of exposed nuclei of 
H, 
He, 
Li, 
Be, and 
B in nuclear emulsion at Riken Projectile-fragment Separator of RIKEN Radioactive Isotope Beam Factory. After their calibration by 
particles, we obtained a quadric function to present a unified recognition of tracks with volume ratios of five nuclei to the particles. The function in the emulsion has been applied to a candidate event of a 
hypernucleus for identification of the production and decay processes. We succeeded in recognizing a daughter nuclear fragment of a single-
hypernucleus as 
He with a likelihood ratio of 0.9; the process was then uniquely identified as 
+ 
N 
Be + 
He + 
.
Kawasaki, Masatsugu; Nakajima, Junya; Yoshida, Keisuke; Kato, Saori; Nishino, Sho; Nozaki, Teo; Nakagawa, Masahiro; Tsunoda, Junichi; Sugaya, Yuki; Hasegawa, Rie; et al.
JAEA-Data/Code 2017-004, 57 Pages, 2017/03
JAEA-Data-Code-2017-004.pdf:2.34MB
In emergency situation of nuclear facilities, we need to estimate the radiation dose due to radiation and radioactivity to grasp the influence range of the accident in the early stage. Therefore, we prepare the case studies of dose assessment for public exposure dose and personal exposure dose and contribute them to emergency procedures. This document covers about accidents of nuclear facilities in Nuclear Science Research Institute and past accident of nuclear power plant, and it can be used for inheritance of techniques of emergency dose assessment.
Yamada, Katsunori; Fujii, Katsutoshi; Kanda, Hiroshi; Higashi, Daisuke; Kobayashi, Toshiaki; Nakagawa, Masahiro; Fukami, Tomoyo; Yoshida, Keisuke; Ueno, Yumi; Nakajima, Junya; et al.
JAEA-Review 2013-033, 51 Pages, 2013/12
JAEA-Review-2013-033.pdf:2.73MB
After the accident at Fukushima Dai-ichi Nuclear Power Plant, various numerical criteria relevant to radiation protection were defined. We surveyed these criteria through internet. As a result of survey, the following 13 items were identified: (1) criteria for taking stable iodine tablets, (2) criteria for the screening of surface contamination, (3) evacuation area, sheltering area, etc., (4) activity concentrations in food, drinking water, etc., (5) dose limit for radiation workers engaged in emergency work, (6) guideline levels of radioactive substances in bathing areas, (7) criteria for use of school buildings and schoolyards, (8) restriction on planting rice, (9) acceptable activity concentrations in feedstuff, (10) acceptable activity concentrations in compost, (11) criteria for export containers and ships, (12) criteria for contaminated waste, (13) standards for radiation workers engaged in decontamination work. In this report, the basis of and issues on these criteria are summarized.
Shiraishi, Junya; Yoshida, Zensho*; Furukawa, Masaru*
Astrophysical Journal, 697(1), p.100 - 105, 2009/03
Times Cited Count：5 Percentile：17.83(Astronomy & Astrophysics)A thin disk accompanied by spindle-like jet, created commonly near massive central objects, exhibits a topologically singular aspect when viewed from an ideal macroscopic theory. The accreting inflow and jet's outflow are "singular perturbation" on the ambient Keplerian rotation, which are generated by some non-ideal higher-order (in the order of derivatives) effect. The Hall effect can generate such a structure in a weakly ionized plasma of a protostellar disk. Numerical estimate of the characteristic length scale defined by the singular perturbation justifies the precedence of the Hall effect.
Katayama, Hisato*; Kitamura, Harushige*; Mori, Mari*; Nakagawa, Junya*; Yoshida, Takahiro*; Kawai, Toshihiko*; Hase, Yoshihiro; Tanaka, Atsushi
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 94, 2007/02
no abstracts in English
Kitamura, Harushige*; Katayama, Hisato*; Mori, Mari*; Nakagawa, Junya*; Yoshida, Takahiro*; Kawai, Toshihiko*; Hase, Yoshihiro; Tanaka, Atsushi
no journal, ,
no abstracts in English
Hino, Kosaku*; Katayama, Hisato*; Kitamura, Harushige*; Kawamura, Yoko*; Nakagawa, Junya*; Yoshida, Takahiro*; Mori, Mari*; Semba, Toshio*; Hase, Yoshihiro; Tanaka, Atsushi
no journal, ,
no abstracts in English
Hino, Kosaku*; Kitamura, Harushige*; Katayama, Hisato*; Mori, Mari*; Kawamura, Yoko*; Nakagawa, Junya*; Yoshida, Takahiro*; Hase, Yoshihiro; Tanaka, Atsushi
no journal, ,
no abstracts in English
Matsunaga, Go; Shinohara, Koji; Isayama, Akihiko; Aiba, Nobuyuki; Shiraishi, Junya; Honda, Mitsuru; Yoshida, Maiko; JT-60 Team
no journal, ,
no abstracts in English
plasmasShiraishi, Junya; Miyato, Naoaki; Matsunaga, Go; Toma, Mitsunori; Honda, Mitsuru; Suzuki, Takahiro; Yoshida, Maiko; Hayashi, Nobuhiko; Ide, Shunsuke
no journal, ,
no abstracts in English
Kimura, Daisuke; Hikinuma, Yuichi; Tanabe, Masanori; Makino, Tatsuya; Maegawa, Yoshiharu; Hayata, Kenichi*; Shiotani, Junya*; Nohara, Naofumi; Hoshi, Katsuya; Tsujimura, Norio; et al.
no journal, ,
no abstracts in English
Yoshida, Junya; Ohashi, Masaki*; Goto, Ryosuke*; Nagase, Yuichi*; Murai, Rina*; May, S.*; Aye, M. M. T.*; Kimbara, Shinji*; Yoshimoto, Masahiro*; Nakazawa, Kazuma*
no journal, ,
J-PARC E07 collaboration has been performed K- beam exposure to all the emulsion sheet detector. The analysis for double strangeness nuclei is ongoing. We'll discuss the current status, performance, speed, and future prospects.
Yoshida, Junya
no journal, ,
The studies of double strangeness nuclei play an important role for modern hadron physics because they have been providing information about Lambda-Lambda and Xi-Nucleon interaction as extensions of nuclear force. J-PARC E07 is a unique experiment at J-PARC to investigate double strangeness nuclei with hybrid emulsion method. This experiment was designed to obtain ten times more double strangeness nuclei than that obtained by previous experiments. Moreover, it aims the first measurement of X-ray from Xi-atom by Germanium detector. The beam exposure of E07 was successfully completed in 2016 and 2017. New double strangeness nuclear events will be detected in the near future through the analysis of emulsion sheet. I will report the present status and the future prospect of the experiment.
Yoshida, Junya
no journal, ,
J-PARC E07 is a unique experiment at J-PARC to investigate double strangeness nuclei with hybrid emulsion method. It was designed to obtain ten times more double strangeness nuclei than that obtained by previous experiments. Moreover, it aims the first measurement of X-ray from 
-atom by Germanium detector. Beam exposure of E07 and photographic development of emulsion sheets are successfully completed. Several double strangeness events are found through searching work. I will report the present status, analysis of detected events, and the prospect of the experiment.
Yoshida, Junya
no journal, ,
J-PARC E07 is a unique experiment at J-PARC to investigate double hypernuclei with the hybrid emulsion method. It is designed to detect 10 times higher statistics of double hypernuclei compared to the past experiments. Moreover, this experiment aims the first measurement of X-ray from Xi-atom by a Germanium detector array. These experimental data will provide essential information on Lambda-Lambda and Xi-nucleon interactions. Beam exposure of J-PARC E07 has been completed in 2017 with 118 emulsion modules containing 1.5k emulsion sheets. Photographic developing of all emulsion sheets has been completed. These emulsion sheets are presently being analyzed with dedicated microscope systems. About 10 double hypernuclear events have been observed in nearly ten percent of total statistics as of June 2018. I will report the latest information about our experiment: status of searching work, analysis of found events, and the prospect of the analysis.
Yoshida, Junya; Ekawa, Hiroyuki; Hayakawa, Shuhei; Kasagi, Ayumi*; Nishimura, Shin*; Nyaw, A. N. L.*; Yoshimoto, Masahiro*; Nakazawa, Kazuma*
no journal, ,
J-PARC E07, an experiment with emulsion technique, is carrying out to detect 10 times higher statistics of double hypernuclei compared to the past experiments. This experiment aims to obtain quantitative data on baryon-baryon interaction, such as - and -nucleon interaction, by the mass measurement of various double hypernuclei. We completed beam exposure and photographic processing of the all emulsion modules as scheduled in 2018. In this presentation, the current status of the experiment, progress of analysis, the detection efficiency, and the schedule are introduced. As of Jan. 2019, we have scanned about 53% of 1300 emulsion sheets at least once. We have detected 22 candidate events of double hypernuclei.
