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Katsuta, Nagayoshi*; Umemura, Ayako*; Naito, Sayuri*; Masuki, Yuma*; Itayama, Yui*; Niwa, Masakazu; Shirono, Shinichi*; Yoshida, Hidekazu*; Kawakami, Shinichi*
Spectrochimica Acta, Part B, 210, p.106817_1 - 106817_11, 2023/12
Times Cited Count：0 Percentile：0.02(Spectroscopy)X-ray fluorescence (XRF) scanning of lacustrine sediments has been used to extend the approach to a wider range of elemental records in both ages and timescales of variations in past environments and climates. However, one of severe problems with effects of the XRF intensity by grain size and mineralogical composition known as "heterogeneity effects" have been pointed out. This study investigated the heterogeneity effect of Fe intensities on X-ray beam using several binary powder mixtures and lacustrine sediment cores.
Katsuta, Nagayoshi*; Takano, Masao*; Sano, Naomi; Tani, Yukinori*; Ochiai, Shinya*; Naito, Sayuri*; Murakami, Takuma*; Niwa, Masakazu; Kawakami, Shinichi*
Sedimentology, 66(6), p.2490 - 2510, 2019/10
Times Cited Count：7 Percentile：49.6(Geology)Micro-X-ray fluorescence (XRF) scanning spectroscopy of marine and lake sedimentary sequences can provide detailed paleoenvironmental records available through element intensities proxy data. However, problems for effects of interstitial pore water on the micro-XRF intensities have been pointed out so far because of direct measurement on the split wet sediment surfaces. In this study, new methods for the XRF corrections were developed by being considered with the micro-X-ray scanning spectroscopy.
Wang, H.*; Otsu, Hideaki*; Chiga, Nobuyuki*; Kawase, Shoichiro*; Takeuchi, Satoshi*; Sumikama, Toshiyuki*; Koyama, Shumpei*; Sakurai, Hiroyoshi*; Watanabe, Yukinobu*; Nakayama, Shinsuke; et al.
Communications Physics (Internet), 2(1), p.78_1 - 78_6, 2019/07
Times Cited Count：8 Percentile：56.2(Physics, Multidisciplinary)Searching for effective pathways for the production of proton- and neutron-rich isotopes through an optimal combination of reaction mechanism and energy is one of the main driving forces behind experimental and theoretical nuclear reaction studies as well as for practical applications in nuclear transmutation of radioactive waste. We report on a study on incomplete fusion induced by deuteron, which contains one proton and one neutron with a weak binding energy and is easily broken up. This reaction study was achieved by measuring directly the cross sections for both proton and deuteron for 
Pd at 50 MeV/u via inverse kinematics technique. The results provide direct experimental evidence for the onset of a cross-section enhancement at high energy, indicating the potential of incomplete fusion induced by loosely-bound nuclei for creating proton-rich isotopes and nuclear transmutation of radioactive waste.
Katsuta, Nagayoshi*; Ikeda, Hisashi*; Shibata, Kenji*; Kokubu, Yoko; Murakami, Takuma*; Tani, Yukinori*; Takano, Masao*; Nakamura, Toshio*; Tanaka, Atsushi*; Naito, Sayuri*; et al.
Global and Planetary Change, 164, p.11 - 26, 2018/05
Times Cited Count：10 Percentile：43.77(Geography, Physical)Paleoenvironmental and paleoclimate changes in Siberia were reconstructed by continuous, high-resolution records of chemical compositions from a sediment core retrieved from the Buguldeika Saddle, Lake Baikal, dating back to the last 33 cal. ka BP. The Holocene climate followed by a shift at ca. 6.5 cal. ka BP toward warm and dry, suggesting that the climate system transition from the glacial to interglacial state occurred. In the last glacial period, the deposition of carbonate mud from the Primorsky Range was associated with Heinrich events (H3 and H1) and the Selenga River inflow was caused by meltwater of mountain glaciers in the Khamar-Daban Range. The anoxic bottom-water during Allerod-Younger Dryas was probably a result of weakened ventilation associated with reduced Selenga River inflow and microbial decomposition of organic matters from the Primorsky Range. The rapid decline in precipitation during the early Holocene may have been a response to the 8.2 ka cooling event.
Hirayama, Yoshikazu*; Mihara, Mototsugu*; Watanabe, Yutaka*; Jeong, S. C.*; Miyatake, Hiroari*; Momota, Sadao*; Hashimoto, Takashi*; Imai, Nobuaki*; Matsuta, Kensaku*; Ishiyama, Hironobu*; et al.
European Physical Journal A, 48(5), p.54_1 - 54_10, 2012/05
Times Cited Count：2 Percentile：16.82(Physics, Nuclear)
LiJeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Sugai, Hiroyuki; et al.
Japanese Journal of Applied Physics, 47(8), p.6413 - 6415, 2008/08
Times Cited Count：5 Percentile：22.74(Physics, Applied)A non-destructive and on-line diffusion tracing in Li ionic conductors has been demonstrated. As a tracer, pulsed beam of Li was implanted into LiGa. By analyzing the time dependent yield of the 
-particles decaying from Li, diffusion coefficients were extracted with a high accuracy. The ordering of Li vacancies in the Li-deficient 
phase of LiGa was observed for the first time in terms of the Li diffusion.
Li short-lived radiotracer in Li ionic conductors of NaTl-type intermetallic compoundsSugai, Hiroyuki; Sataka, Masao; Okayasu, Satoru; Ichikawa, Shinichi; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nakanoya, Takamitsu; Osa, Akihiko; Sato, Tetsuya; Hashimoto, Takashi; et al.
Defect and Diffusion Forum, 273-276, p.667 - 672, 2008/00
Ishiyama, Hironobu*; Ishikawa, Tomoko*; Hashimoto, Takashi; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Tanaka, Masahiko*; Fuchi, Yoshihide*; Yoshikawa, Nobuharu*; et al.
Nuclear Instruments and Methods in Physics Research A, 560(2), p.366 - 372, 2006/05
Times Cited Count：7 Percentile：47.51(Instruments & Instrumentation)Thanks to the nature of inverse transfer-reactions, low-energy radioactive nuclear beams in light neutron-rich region were produced. The mass-separation and velocity-separation of the JAERI recoil mass-separator help to form high purity beams. The beams of 
Li, 
B, and 
N-RNBs are utilized to the experiments, so far, with those beam intensities and purities of 1.4
10
pps and 99
, 7.810
pps and 98, and 4.710 pps and 98.5, respectively.
LiJeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Okayasu, Satoru; et al.
Journal of Phase Equilibria and Diffusion, 26(5), p.472 - 476, 2005/09
Authors developed a radiotracer method for diffusion studies in solids. The experimental test was performed by the measurement of the diffusion coefficients of Li in a sample of the compound LiAl using an -emitting radiotracer of Li(T
= 0.84 s). It was found that the time-dependent yields of the alpha particles from the diffusing 8Li that was initially implanted in the sample could be used as a measure of the diffusivity of the tracer in a nondestructive way. The method was applied to measure the self-diffusion coefficients of Li in LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.
LiJeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.
Nuclear Instruments and Methods in Physics Research B, 230(1-4), p.596 - 600, 2005/04
Times Cited Count：6 Percentile：45.53(Instruments & Instrumentation)no abstracts in English
Nakanoya, Takamitsu; Abe, Shinichi; Matsuda, Makoto; Nishio, Katsuhisa; Hanashima, Susumu; Ichikawa, Shinichi; Tsukihashi, Yoshihiro; Takeuchi, Suehiro; Ishiyama, Hironobu*; Jeong, S.-C.*; et al.
Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.123 - 126, 2004/00
no abstracts in English
Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Iwase, Akihiro; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.
Japanese Journal of Applied Physics, Part 1, 42(7A), p.4576 - 4583, 2003/07
no abstracts in English
Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Sataka, Masao; Iwase, Akihiro*; Okayasu, Satoru; Sugai, Hiroyuki; Ichikawa, Shinichi; et al.
Japanese Journal of Applied Physics, Part 1, 42(7A), p.4576 - 4583, 2003/07
Times Cited Count：14 Percentile：50.38(Physics, Applied)no abstracts in English
Miyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; Fuchi, Yoshihide*; Nomura, Toru*; et al.
no journal, ,
no abstracts in English
Oyaizu, Mitsuhiro*; Ishiyama, Hironobu*; Imai, Nobuaki*; Kawakami, Hirokane*; Tanaka, Masahiko*; Jeong, S.-C.*; Hirayama, Yoshikazu*; Fuchi, Yoshihide*; Miyatake, Hiroari; Watanabe, Yutaka*; et al.
no journal, ,
Experimental results on the charge breeding efficiencies for medium-hevy elements, such as indium, barium, Zenon, etc, including radioactive isotopes were reported.
LiMiyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; Fuchi, Yoshihide*; Nomura, Toru*; et al.
no journal, ,
A systematic study of astrophysical reaction rates on light neutron-rich nuclei using low-energy radioactive nuclear beams (RNB) is in progress at the tandem facility of Japan Atomic Energy Agency (JAEA). Direct measurements of reaction rates of Li(, n)
B, B(, n)
N and, Li(d, p), (d, t), (d, ), (p, ) have been carried out. Measured excitation functions and obtained reaction rates will be presented. Possible r-process path via Li at each temperature during r-process and the influence of r-process abundance will be discussed.
Li short-lived radiotracerSugai, Hiroyuki; Sataka, Masao; Okayasu, Satoru; Ichikawa, Shinichi; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nakanoya, Takamitsu; Osa, Akihiko; Sato, Tetsuya; Hashimoto, Takashi; et al.
no journal, ,
Non-destructive and on-line Li diffusion experiments in Li ionic conductors are conducted using the short-lived -emitting radiotracer of Li. The radiotracers produced as an energetic and pulsed ion beam from TRIAC (Tokai Radioactive Ion Accelerator Complex) are implanted into a structural defect mediated Li ionic conductor of NaTl-type intermetallic compounds -LiGa. The diffusion coefficients obtained for -LiGa with Li content of 43-54 at.% at room temperature are discussed in terms of the interaction between Li-ion and the structural defects in the specimen, compared with the case of -LiAl and -LiIn. The nonlinear Li-content dependency of Li diffusion coefficients for -LiGa suggests that the Li diffusion with Li-deficient region is obstructed by the defect complex composed of vacancies at the Li sites.
Kawakami, Yoshiyuki; Nagaoka, Shinichi; Kitao, Takahiko; Morimoto, Kazuyuki; Obu, Tomoyuki; Kanamori, Sadamu; Omori, Eiichi
no journal, ,
We are trying to research how acidity and temperature influences Np behavior at extraction process in Tokai Reprocessing Plant. So we varied acidity and warmed up solution within the limit of operating parameter for second extraction cycle, and measured Np extracted.
Nanko, Masayuki; Kawakami, Akihiro; Ito, Shinichi; Shichi, Ryo; Iwabuchi, Hiroki
no journal, ,
no abstracts in English
Horie, Koji; Kawakami, Akihiro; Ito, Shinichi; Sato, Shinji; Shimizu, Takenori; Shichi, Ryo
no journal, ,
no abstracts in English
