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muon spin relaxation method and first-principles calculationsTsuru, Tomohito; Nishimura, Katsuhiko*; Matsuda, Kenji*; Nunomura, Norio*; Namiki, Takahiro*; Lee, S.*; Higemoto, Wataru; Matsuzaki, Teiichiro*; Yamaguchi, Masatake; Ebihara, Kenichi; et al.
Metallurgical and Materials Transactions A, 54(6), p.2374 - 2383, 2023/06
Times Cited Count：2 Percentile：25.24(Materials Science, Multidisciplinary)Although hydrogen embrittlement susceptibility of high-strength Al alloys is recognized as a critical issue in the practical use of Al alloys, identifying the hydrogen trapping or distribution has been challenging. In the present study, an effective approach based on experiment and simulation is proposed to explore the potential trap sites in Al alloys. Zero-field muon spin relaxation experiments were carried out for Al-0.5%Mg, Al-0.2%Cu, Al-0.15%Ti, Al-0.011%Ti, Al-0.28%V, and Al-0.015%V (at.%) in the temperature range from 5 to 300 K. The temperature variations of the dipole field widths have revealed three peaks for Al-0.5%Mg, four peaks for Al-0.2%Cu, three peaks for Al-0.011%Ti and Al-0.015%V. Atomic configurations of the muon trapping sites corresponding to the observed 
peaks are well assigned using the first-principles calculations for the trap energies of hydrogen around a solute and solute-vacancy pair. The extracted linear relationship between the muon peak temperature and the trap energy enables us to explore the potential alloying elements and their complex that have strong binding energies with hydrogen in Al alloys.
Sanada, Yukihisa; Miyamoto, Kenji*; Ochi, Kotaro; Matsuzaki, Koji*; Ogawa, Toshihiro*; Senga, Yasuhiro*
Kaiyo Riko Gakkai-Shi, 24(2), p.9 - 18, 2018/12
Seven years passed since Fukushima Dai-ichi Nuclear Power Station accident which was caused large amount of radionuclide release to the sea. Elucidation of behavior mechanism of radiocesium in the seabed is required for restarting fishing industry. We developed radiation detection system using the unmanned surface vehicle for in-situ measurement of radiocesium concentration in seabed sediment. This system is able to automatically navigate to measurement point and obtain the radiation data on the bottom sediment. The detector was calibrated by comparing the actual sediment samples. The periodical measurement off-shore the Fukushima Prefecture was performed using developed this system. As these results, distribution of radiocesium concentration was changed due to oceanographic condition. However, radiocesium inventory was tendency to decrease according to radiocesium half-life in measurement area. This system is effective for elucidation of behavior mechanism of radiocesium because it can easily measure the radiocesium concentration in the bottom sediment.
Matsuzaki, Shota*; Hayashi, Hiroaki*; Nakajima, Kaoru*; Matsuda, Makoto; Sataka, Masao*; Tsujimoto, Masahiko*; Toulemonde, M.*; Kimura, Kenji*
Nuclear Instruments and Methods in Physics Research B, 406(Part B), p.456 - 459, 2017/09
Times Cited Count：5 Percentile：39.65(Instruments & Instrumentation)
O
thin films on Si (100) by ion beam sputter depositionMao, W.*; Fujita, Masaya*; Chikada, Takumi*; Yamaguchi, Kenji; Suzuki, Akihiro*; Terai, Takayuki*; Matsuzaki, Hiroyuki*
Surface & Coatings Technology, 283, p.241 - 246, 2015/12
Times Cited Count：3 Percentile：12.88(Materials Science, Coatings & Films)Single-phase nanocrystalline thin films of ErO (440) has been first prepared using Si (100) substrates by ion beam sputter deposition at 973 K at a pressure of 
10
Pa and 
-
annealing at 1023 K at a pressure of 
10
Pa. Er silicides formed during the deposition are eliminated via the annealing, which results in the single phase and the smooth surface of the ErO thin films. The epitaxial relationship between Si (100) and ErO (110) is clarified by X-ray diffraction and reflection high energy electron diffraction.
Miyake, Yasuhiro*; Nishiyama, Kusuo*; Kawamura, Naritoshi*; Makimura, Shunsuke*; Strasser, P.*; Shimomura, Koichiro*; Beveridge, J. L.*; Kadono, Ryosuke*; Fukuchi, Koichi*; Sato, Nobuhiko*; et al.
Physica B; Condensed Matter, 374-375, p.484 - 487, 2006/03
Times Cited Count：6 Percentile：31.27(Physics, Condensed Matter)The construction of the Materials and Life Science building was started in the beginning of the fiscal year of 2004. After commissioning of the accelerator and beam transport sections in 2008, muon beams will be available for users in 2009. In this letter, the latest construction status of the J-PARC Muon Science Facility is reported.
Tsujimura, Norio; Komatsuzaki, Kenji; Shinohara, Kunihiko; Morita, Suguru; Momose, Takumaro
PNC TN8410 97-430, 20 Pages, 1997/12
None
Tsujimura, Norio; Morita, Suguru; Komatsuzaki, Kenji; Momose, Takumaro; Shinohara, Kunihiko
PNC TN8410 97-274, 29 Pages, 1997/09
None
Tsujimura, Norio; Morita, Suguru; Komatsuzaki, Kenji; Momose, Takumaro; Shinohara, Kunihiko
PNC TN8410 97-268, 29 Pages, 1997/08
None
Tsujimura, Norio; ; Komatsuzaki, Kenji; Momose, Takumaro; Shinohara, Kunihiko
PNC TN8410 97-256, 15 Pages, 1997/07
None
Tsujimura, Norio; ; Komatsuzaki, Kenji; Momose, Takumaro; Shinohara, Kunihiko
PNC TN8410 97-013, 14 Pages, 1997/01
None
Tsujimura, Norio; ; Komatsuzaki, Kenji; Momose, Takumaro; Shinohara, Kunihiko
PNC TN8410 97-002, 40 Pages, 1996/12
None
Seki, Arisa*; Tada, Ryuji*; Irino, Tomohisa*; Matsuzaki, Kenji*; Yoshioka, Jumpei*; Nara, Fumiko; 20 of others*; ReC23-03 members*
no journal, ,
In the Repository Core Re-Discovery Program (ReCoRD), repository cores drilled by DSDP, ODP, and IODP, and stored at Kochi Core Center (KCC) are reanalyzed by the ReCoRD research team, which is similar to science parties of drilling expeditions. The non-destructive analysis and sampling party of third ReCoRD project, ReC23-03 The Japan Seapaleoceanography and paleoclimatology during the Miocene is conducted in the last year. In this project, we focus on understanding the short time scale oceanic environmental changes in the warmer-than-today world, which is important for addressing future global warming. We are especially focusing on; 1) centennial to millennial scale oceanographic changes recorded in laminated sediments. 2) rapid warming event (10.8 Ma) and subsequent oceanographic condition. To understand oceanographic condition properly, comparison of sediments deposited at different water depth at the same time is necessary. In this project, our objective is to reconstruct millennial-scale, three dimensional oceanographic changes during the Miocene using revised high-resolution age models. In the presentation, we introduce 20 sample requests submitted to the Japan Sea ReCoRD project (ReC23-03), and explain relationship between them and progress of the project. We also present assets of using non-destructive measurement (XRF core scanner, X-ray CT) results during the sampling party.
Matsuzaki, Tatsuji; Tokiwa, Tetsuya; Nakatsukasa, Masashi*; Yamada, Yasuhiro*; Akamine, Shinnosuke*; Amano, Kenji; Niizato, Tadafumi
no journal, ,
no abstracts in English
Shirase, Mitsuyasu*; Niunoya, Sumio*; Sawada, Sumiyuki; Nakayama, Masashi; Tanai, Kenji; Matsuzaki, Tatsuji
no journal, ,
no abstracts in English
Sawada, Sumiyuki; Nakayama, Masashi; Tanai, Kenji; Matsuzaki, Tatsuji; Motoshima, Takayuki*; Jo, Mayumi*
no journal, ,
no abstracts in English
Nakayama, Masashi; Sawada, Sumiyuki; Tanai, Kenji; Sugita, Yutaka; Matsuzaki, Tatsuji; Jo, Mayumi*
no journal, ,
no abstracts in English
Matsuzaki, Tatsuji; Amano, Kenji; Nakayasu, Akio*; Sasamoto, Hiroshi; Semba, Takeshi; Yoshida, Hidekazu*
no journal, ,
no abstracts in English
Matsuzaki, Tatsuji*; Amano, Kenji; Fujimoto, Tomoya*
no journal, ,
no abstracts in English
