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Journal Articles

High-rate performance of a time projection chamber for an H-dibaryon search experiment at J-PARC

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:2 Percentile:42.44(Instruments & Instrumentation)

Journal Articles

Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

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:13 Percentile:85.21(Physics, Multidisciplinary)

Journal Articles

Trapping probability of strangeness via $$mathrm{Xi}^{-}$$ hyperon capture at rest in nuclear emulsion

Theint, 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:3 Percentile:46.93(Physics, Multidisciplinary)

JAEA Reports

Case studies of radiation dose assessment in emergency situation of nuclear facilities

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.

JAEA Reports

Survey of radiation protection creiteria following the accident at the Fukushima Dai-ichi Nuclear Power Plant

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.

Journal Articles

Topological transition from accretion to ejection in a disk-jet system; Singular perturbation of the Hall effect in a weakly ionized plasma

Shiraishi, Junya; Yoshida, Zensho*; Furukawa, Masaru*

Astrophysical Journal, 697(1), p.100 - 105, 2009/03

 Times Cited Count:5 Percentile:19.16(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.

Journal Articles

Ion beam breeding of rice variety suitable for low nitrogen input

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

Oral presentation

Study on the creation of rice for cultivation with low fertilizer using mutation induction technology with ion beam

Kitamura, Harushige*; Katayama, Hisato*; Mori, Mari*; Nakagawa, Junya*; Yoshida, Takahiro*; Kawai, Toshihiko*; Hase, Yoshihiro; Tanaka, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Ion beam breeding of rice suitable for low nitrogen input

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

Oral presentation

Ion beam breeding of rice suitable for low nitrogen input

Hino, Kosaku*; Kitamura, Harushige*; Katayama, Hisato*; Mori, Mari*; Kawamura, Yoko*; Nakagawa, Junya*; Yoshida, Takahiro*; Hase, Yoshihiro; Tanaka, Atsushi

no journal, , 

no abstracts in English

Oral presentation

MHD mode behavior and its effect on plasma rotation in JT-60U high-beta plasmas

Matsunaga, Go; Shinohara, Koji; Isayama, Akihiko; Aiba, Nobuyuki; Shiraishi, Junya; Honda, Mitsuru; Yoshida, Maiko; JT-60 Team

no journal, , 

no abstracts in English

Oral presentation

Impact of kinetic effects of energetic particles on resistive wall mode stability in rotating high-$$beta$$ plasmas

Shiraishi, Junya; Miyato, Naoaki; Matsunaga, Go; Toma, Mitsunori; Honda, Mitsuru; Suzuki, Takahiro; Yoshida, Maiko; Hayashi, Nobuhiko; Ide, Shunsuke

no journal, , 

no abstracts in English

Oral presentation

A Verification test of commercial calibration device for beta and neutron rays for EPD

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

Oral presentation

Status of the J-PARC E07 emulsion analysis

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.

Oral presentation

J-PARC E07, systematic study of double strangeness nuclei with hybrid emulsion method

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.

Oral presentation

Status of J-PARC E07; Systematic study of double strangeness nuclei with hybrid emulsion method

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 $${Xi}$$-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.

Oral presentation

J-PARC E07, systematic study of doublestrangeness nuclei with hybrid emulsion method

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.

Oral presentation

Status of J-PARC E07

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 $$Lambda$$-$$Lambda$$ and $$Xi$$-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.

Oral presentation

Analysis status of $$Sigma^+ p$$ scattering events in the J-PARC E40 experiment

Nanamura, Takuya; Ichikawa, Yudai; Hayakawa, Shuhei; Yoshida, Junya; Miwa, Koji*; Honda, Ryotaro*; Akazawa, Yuya*; Yamamoto, Takeshi

no journal, , 

Hyperon-nucleon scattering experiment is one of the powerful methods for studying YN interaction. However, it is difficult due to short lifetime of hyperon. $$Sigma N$$ scattering experiments were performed as KEK E251 and KEK E289 in order to measure the differential cross sections. In these experiments, statistics were limited to less than 100 events and differential cross section had too large statistical errors to restrict baryon-baryon interaction models. J-PARC E40 experiment aims for measuring cross sections of $$Sigma p$$ scatterings with high statistics ($$ sim $$10000 events) by overcoming difficulties of hyperon-nucleon scattering experiment. By using high rate ($$sim$$ 19M /spill) $$pi$$ beam and large acceptance spectrometer, we can produce and tag large amount of $$Sigma$$ beam. LH$$_2$$ target and surrounding detector system CATCH enable us to reconstruct reactions from two body kinematics. Our experimental group completed $$Sigma^-$$ data taking and about half of $$Sigma^+$$ data taking by 2019 Apr. Left data taking will be performed in the end of this fiscal year.

Oral presentation

Status of J-PARC E07

Yoshida, Junya; Hayakawa, Shuhei; Ekawa, Hiroyuki*; Yoshimoto, Masahiro*; Kasagi, Ayumi*; Lin, P. M.*; Nyaw, A. N. L.*; Nakazawa, Kazuma*

no journal, , 

J-PARC E07 is an experiment with the photographic emulsion technique to detect 10 times higher statistics of double hypernuclei compared to the past experiments. This experiment aims to obtain quantitative data on $$Lambda$$-$$Lambda$$ and $$Xi$$-nucleon interaction, by the mass measurement of various double hypernuclei. As of July 2019, we have scanned about 53% of 1300 emulsion sheets at least once and detected about 30 candidate events of double hypernuclei. We start a study of the branching ratio of the decay mode with the accumulating data. However, the detection efficiency is about half of the designed value. It is due to the rugged surface position of emulsion module. We are developing the correction method to reconstruct its original geometry by using proton tracks which punch through SSD and emulsion sheets.

26 (Records 1-20 displayed on this page)