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Journal Articles

Exotic hadrons from heavy ion collisions

Cho, S.*; Hyodo, Tetsuo*; Jido, Daisuke*; Ko, C. M.*; Lee, S. H.*; Maeda, Saori*; Miyahara, Kenta*; Morita, Kenji*; Nielsen, M.*; Onishi, Akira*; et al.

Progress in Particle and Nuclear Physics, 95, p.279 - 322, 2017/07

AA2016-0538.pdf:0.74MB

 Times Cited Count:80 Percentile:89.92(Physics, Nuclear)

With upgraded detectors at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), it has become possible to measure hadrons beyond their ground states in high energy heavy ion collisions. Therefore, heavy ion collisions provide a new method for studying exotic hadrons that are either molecular states made of various hadrons or compact system consisting of muliquarks. Because their structures are related to the fundamental properties of Quantum Chromodynamics (QCD), studying exotic hadrons is currently one of the most active areas of research in hadron physics. The present review is a summary of the current understanding of a selected set of exotic candidate particles that can be potentially measured in heavy ion collisions.

Journal Articles

Roles of conceptual model development for realistically quantifying radionuclide migration

Miyahara, Kaname; Tachi, Yukio; Kitamura, Akira; Mitsui, Seiichiro; Sawada, Atsushi; Shibata, Masahiro; Neall, F.*; McKinley, I. G.*

Proceedings of 2011 International High-Level Radioactive Waste Management Conference (IHLRWMC 2011) (CD-ROM), p.292 - 298, 2011/04

As the Japanese deep geological disposal programme prepares for milestones at which volunteer sites need to be compared, it is critical that any supporting post-closure safety assessment is done as realistically as possible. Because of the subtle system understanding needed to integrate diverse theoretical, laboratory, field and analogue models, data and observations into the high-level parameters that are incorporated into performance assessment models, normal QA procedures tend to fail completely. This problem is discussed further in this paper and solutions outlined, which build on recent developments of supporting knowledge engineering tools.

Journal Articles

Calculation of dose contributions of electron and charged heavy particles inside phantoms irradiated by monoenergetic neutron

Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Omachi, Yasushi*; Miyahara, Nobuyuki*

Journal of Radiation Research, 49(5), p.503 - 508, 2008/09

 Times Cited Count:7 Percentile:27.27(Biology)

The radiation-transport code PHITS with an event generator mode has been applied to analyze energy depositions of electron and charged heavy particles in two spherical phantoms and a voxel-based mouse phantom upon neutron irradiation. The calculations using the spherical phantoms quantitatively clarified the type and energy of charged particles which are released through interactions of neutrons with the phantom elements and contribute to the radiation dose. The relative contribution of electrons increased with increase in the size of the phantom and with decrease in the energy of the incident neutrons. Calculation with the voxel-based mouse phantom given 2.0-MeV neutron irradiation revealed that the doses to different locations inside the body are uniform, and that the energy is mainly deposited by recoil protons. The present study has demonstrated that analysis using PHITS can yield dose distributions that are accurate enough for RBE evaluation.

JAEA Reports

Development and management of the knowledge base for the geological disposal technology; Annual report 2006

Umeda, Koji; Oi, Takao; Osawa, Hideaki; Oyama, Takuya; Oda, Chie; Kamei, Gento; Kuji, Masayoshi*; Kurosawa, Hideki; Kobayashi, Yasushi; Sasaki, Yasuo; et al.

JAEA-Review 2007-050, 82 Pages, 2007/12

JAEA-Review-2007-050.pdf:28.56MB

This report shows the annual report which shows the summarized results and topic outline of each project on geological disposal technology in the fiscal year of 2006.

Journal Articles

Simulation analysis of radiation fields inside phantoms for neutron irradiation

Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Omachi, Yasushi*; Miyahara, Nobuyuki*

JAEA-Conf 2007-002, p.59 - 65, 2007/02

The present study intends to analyze internal radiation field of a typical mouse with voxel phantom and radiation transport code. A mouse was imaged by using the dedicated small-animal CT scanner, in which slice pitch was set at 0.1 mm. Each image with the resolution of 0.02 mm was segmented to construct a voxel phantom by using computer tools, which have been applied to process human-head images for 3-dimensional dosimetry in BNCT treatment at the Japan Atomic Energy Agency. Input files for particle and heavy ion transport code system were prepared from the constructed 3-dimensional voxel-based image data. Absorbed dose distributions and LET spectra in the mouse body were calculated by PHITS on the segmented images.

Journal Articles

Enhancing the reliability of the technical basis supporting the HLW disposal program in Japan

Ishikawa, Hirohisa; Umeki, Hiroyuki; Naito, Morimasa; Kitamura, Akira; Shimizu, Kazuhiko; Miyahara, Kaname

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

This paper overviews the current status of R&D activities of JNC and integration of their technical achievements, including the progress of two off-site URL (underground research laboratory) projects, in which the surface-based investigation stage is almost complete.

Journal Articles

Soft X-ray beamline for spectroscopy of solids at SPring-8

Saito, Yuji; Kimura, Hiroaki*; Suzuki, Yoshio*; Nakatani, Takeshi*; Matsushita, Tomohiro*; Muro, Takayuki*; Miyahara, Tsuneaki*; Fujisawa, M.*; Soda, Kazuo*; Ueda, Shigenori*; et al.

Nuclear Instruments and Methods in Physics Research A, 467-468(Part.1), p.553 - 556, 2001/07

 Times Cited Count:23 Percentile:82.47(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Performance of a very high resolution soft X-ray beamline BL25SU with a twin-helical undulator at SPring-8

Saito, Yuji; Kimura, Hiroaki*; Suzuki, Yoshio*; Nakatani, Takeshi*; Matsushita, Tomohiro*; Muro, Takayuki*; Miyahara, Tsuneaki*; Fujisawa, M.*; Soda, Kazuo*; Ueda, Shigenori*; et al.

Review of Scientific Instruments, 71(9), p.3254 - 3259, 2000/09

 Times Cited Count:184 Percentile:98.98(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

None

Niwa, Hajime; Kawata, Norio; Ieda, Yoshiaki; Sato, Ikken; Ohno, Shuji; Uto, Nariaki; Miyahara, Shinya; Kondo, Satoru; Kamide, Hideki; Yamaguchi, Akira; et al.

PNC TN9410 94-154, 317 Pages, 1995/03

PNC-TN9410-94-154.pdf:13.66MB

None

Journal Articles

High heat load test of molybdenum

Tanabe, Tetsuro*; Fujine, Michihiko*; Noguchi, Hiroshi*; Yagi, Yasufumi*; Hirano, Yoichi*; Shimizu, Hajime*; Akiba, Masato; Araki, Masanori; Kubota, Yusuke*; Miyahara, Akira*

Journal of Nuclear Materials, 200(1), p.120 - 127, 1993/03

 Times Cited Count:9 Percentile:66.96(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

None

Sasaki, Noriaki; Yusa, Yasuhisa; Yamada, Kazuo; Nodaka, Masayuki*; *; Kawamura, Kazuhiro; Miyahara, Kaname; Arai, Takashi; Kamei, Gento; Hirose, Ikuro; et al.

PNC TN8440 88-018, 170 Pages, 1988/12

PNC-TN8440-88-018.pdf:11.35MB

None

Oral presentation

Simulation of internal radiation field using voxel-based model of mouse

Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Yamaguchi, Yasuhiro; Omachi, Yasushi*; Miyahara, Nobuyuki*

no journal, , 

The present study intends to analyze internal radiation field of a typical mouse with voxel-based model and radiation transport code. A mouse was imaged by using the dedicated small-animal CT scanner, in which slice pitch was set at 0.1 mm. Each image with the resolution of 0.02 mm was segmented to construct a voxel-based model by using computer tools, which have been applied to process human-head images for 3-dimensional dosimetry in BNCT treatment at the Japan Atomic Energy Agency. Input files for particle and heavy ion transport code system (PHITS) were prepared from the constructed 3-dimensional voxel-based image data. Absorbed dose distributions and LET spectra in the mouse body were calculated by PHITS on the segmented images.

Oral presentation

PHITS simulation on internal radiation fields at neutron irradiation

Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Omachi, Yasushi*; Miyahara, Nobuyuki*

no journal, , 

Internal radiation field of a typical mouse was analyzed by PHITS using a voxel-based model. A mouse was imaged by using the dedicated small-animal CT scanner, in which slice pitch was set at 0.1 mm. Each image with the resolution of 0.02 mm was segmented to construct a voxel-based model by using a computer tool JCDS, which have been applied to process human-head images for 3-dimensional dosimetry in BNCT treatment at the Japan Atomic Energy Agency. Input file for PHITS was prepared from the constructed 3-dimensional voxel-based image data. Distribution of deposition energy inside a mouse was calculated on the segmented images.

Oral presentation

Development of waste disposal system for sustainable nuclear power programme, 3; Development of exploratory performance assessment methodology

Honda, Akira; Miyahara, Kaname; Makino, Hitoshi; Oda, Chie; Mitsui, Seiichiro; Umeki, Hiroyuki; Takase, Hiroyasu*

no journal, , 

Authers defined a process, in which the subjects for affecting the credibility of safety cases were explored, the subjects are defined as problems in the performnce assessment and the measures for solving the problems are proposed, as an "Exploratory Performance Assessment". The methodology of "Exploratory Performance Assessment" was introduced by showing an example relevant to the near field performance.

Oral presentation

Simulation analysis for organ doses of mouse and human upon neutron exposure by use of voxel phantoms

Satoh, Daiki; Sato, Kaoru; Takahashi, Fumiaki; Endo, Akira; Miyahara, Nobuyuki*; Tsuji, Atsushi*; Omachi, Yasushi*

no journal, , 

The present study intends to calculate the organ doses and analyze the characteristics of the radiation field inside the bodies of a mouse and human. The voxel phantom of mouse had already been developed for an 8-week-old C$$_{3}$$H/HeNs mouse in the previous work. We upgraded this phantom to improve the resolution (voxel size: 0.1$$times$$0.1$$times$$0.1 mm$${^3}$$), and add the nine solid organs. The JM phantom is the voxel phantom of a Japanese adult male developed for the analysis of internal exposure from photons and electrons. We have converted the JM phantom to use in the dose calculation on external neutron exposure, and verified it through the calculation of the absorbed dose per unit neutron fluence at each organ for monoenergetic neutrons. The calculation results showed a good agreement with the reference values reported by ICRP. From the comparison between the organ doses of the mouse and human, it was found that the relativistic dose contribution of electron in the human body is greater than that in the mouse body. This is because the neutrons are moderated inside a large receptor such as the human body, and causes the thermal neutron capture reaction that generates $$gamma$$ ray and consequently electron.

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