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Tokunaga, Yo; Ishitobi, Takayuki; Sakai, Hironori; Kambe, Shinsaku*; Harima, Hisatomo*; Nakamura, Ai*; Maurya, A.*; Li, D.*; Homma, Yoshiya*; Honda, Fuminori*; et al.
Physical Review Letters, 137(4), p.046501_1 - 046501_6, 2026/07
Times Cited Count：1
Zn
Mo
O
Bao, S.*; Liao, J.*; Huang, Z.*; Shangguan, Y.*; Ma, Z.*; Zhang, B.*; Cheng, S.*; Xu, H.*; Song, Z.*; Dong, S.*; et al.
Physical Review Letters, 136(9), p.096502_1 - 096502_8, 2026/03
Times Cited Count：3 Percentile：96.14(Physics, Multidisciplinary)
O
Gao, B.*; Chen, T.*; Liu, C.*; Klemm, M. L.*; Zhang, S.*; Ma, Z.*; Xu, X.*; Won, C.*; McCandless, G. T.*; Rao, K.*; et al.
Science Advances (Internet), 12(10), p.eaed7778_1 - eaed7778_7, 2026/03
Times Cited Count：2 Percentile：76.89(Multidisciplinary Sciences)Bess, J. D.*; Shepherd, D.*; McSpaden, A. T.*; Fukushima, Masahiro; Oizumi, Akito
International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook (2025 edition); NEA/NSC/DOC(95)03/I, Vol.I; PU-MET-FAST-050 (Internet), 544 Pages, 2026/02
This report presents a series of experiments conducted to obtain integral benchmark data for lead cross sections, which are essential for the design of Accelerator-Driven Systems (ADS). In this experimental campaign, systematic data were acquired using various fuel compositions, including highly enriched uranium, low-enriched uranium, and plutonium, under fast neutron spectrum conditions moderated by lead. All experiments were jointly conducted by JAEA and Los Alamos National Laboratory (LANL) at the National Criticality Experiments Research Center (NCERC). Two experimental cores for plutonium fuel were constructed. The Jupiter core used plutonium metal fuel containing 95 wt.% 
Pu and 4.5 wt.% 
Pu, while the High-240 Pu Jupiter core employed plutonium metal fuel with a higher Pu content, 72.8 wt.% Pu and 22 wt.% Pu. This benchmark report summarizes the results of High-240 Pu Jupiter experiments for registration in the International Criticality Safety Benchmark Evaluation Project (ICSBEP).
Yao, X.*; Chen, P.*; Verma, R.*; Zhao, X.*; Yang, H.-Y.*; DeBeer-Schmitt, L.*; Aczel, A. A.*; Wu, C.-M.*; Alba Venero, D.*; Ohara, Takashi; et al.
Physical Review Letters, 136(8), p.086702_1 - 086702_6, 2026/02
Times Cited Count：2 Percentile：76.89(Physics, Multidisciplinary)Hidaka, Hiroshi*; Kagami, Saya; Saito, Takaharu; Yokoyama, Tatsunori; Pravdivtseva, O.*; Meshik, A.*; Bentridi, S.*; Durastanti Rabnga Mombo, E. D.*; Gall, B.*
Radiation Protection Dosimetry, 202(2), p.65 - 69, 2026/02
Times Cited Count：0 Percentile：0.00(Environmental Sciences)Isotopic studies of the Oklo natural fission reactors have provided very important information to characterize the operating conditions of the individual reactor zones (RZs). Most of the isotopic data of the Oklo RZ materials were given more than a quarter of a century ago. Significant progress has recently been made in the instrumental developments of mass spectrometry for isotopic analyses. If more precise isotopic data from the RZ materials were obtained, we may gain new insights into understanding the Oklo phenomenon. There is still much to learn from the Oklo RZs. In this paper, we introduce our new approaches to elucidate the Oklo phenomenon from isotopic studies using state-of-the-art analytical techniques.
Odaira, Naoya*; Kodama, Katsuaki; Ito, Daisuke*; Saito, Yasushi*; Parker, J. D.*; Shinohara, Takenao
Nuclear Materials and Energy (Internet), 45, p.102005_1 - 102005_7, 2025/12
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)Itayama, Yui*; Davaasuren, D.*; Ochiai, Shinya*; Minami, Masayo*; Masuki, Yuma*; Yoshimizu, Chikage*; Uchida, Mao; Niwa, Masakazu; Tayasu, Ichiro*; Nagao, Seiya*; et al.
Catena, 258, p.109297_1 - 109297_11, 2025/10
Times Cited Count：1 Percentile：27.46(Geosciences, Multidisciplinary)Takahashi, Yoshio*; Miura, Hikaru*; Yamada, Shinya*; Sekizawa, Oki*; Nitta, Kiyofumi*; Hashimoto, Tadashi*; Yomogida, Takumi; Yamaguchi, Akiko; Okada, Shinji*; Itai, Takaaki*; et al.
Journal of Hazardous Materials, 495, p.139031_1 - 139031_19, 2025/09
Times Cited Count：6 Percentile：80.81(Engineering, Environmental)In this presentation, we analyzed the chemical state of cesium in radiocesium-bearing microparticles (CsMPs) released during the 2011 Fukushima Daiichi Nuclear Power Plant accident using high-resolution X-ray absorption spectroscopy (XANES) and micro X-ray fluorescence (
-XRF). The results identified two forms of cesium: one dissolved in glass and the other enriched on the surfaces of internal voids. The latter is considered to have originally existed as a gas and became concentrated during the cooling and solidification of the molten glass. These findings are crucial for understanding the formation process of CsMPs during the accident, as well as for future decommissioning and safety assessments.
Karimi, V.*; Qvistgaard, C. H.*; Schmidt, S.*; Wolfertz, A.*; Parker, J. D.*; Kai, Tetsuya; Hayashida, Hirotoshi*; Shinohara, Takenao; Angelis, S. D.*; Tengattini, A.*; et al.
ACS Applied Materials & Interfaces, 17(36), p.50742 - 50752, 2025/08
Times Cited Count：8 Percentile：69.39(Nanoscience & Nanotechnology)
-molybdenum trioxide particles into waterYang, Y.*; Ngo, M. C.*; Kitagawa, Taiga*; Fujita, Yoshitaka; Takahashi, Yukiko*; Suzuki, Tatsuya*; Nakayama, Tadachika*; Do, T. M. D.*; Niihara, Koichi*; Suematsu, Hisayuki*
RSC Advances (Internet), 15(22), p.17222 - 17229, 2025/05
Times Cited Count：1 Percentile：21.18(Chemistry, Multidisciplinary)no abstracts in English
hydridosilicate at high pressures; A Bridge to BaSiH
polyhydrideBeyer, D. C.*; Spektor, K.*; Vekilova, O. Y.*; Grins, J.*; Barros Brant Carvalho, P. H.*; Leinbach, L. J.*; Sannemo-Targama, M.*; Bhat, S.*; Baran, V.*; Etter, M.*; et al.
ACS Omega (Internet), 10(15), p.15029 - 15035, 2025/04
Times Cited Count：4 Percentile：52.00(Chemistry, Multidisciplinary)Hydridosilicates featuring SiH octahedral moieties represent a rather new class of compounds with potential properties relating to hydrogen storage and hydride ion conductivity. Here, we report on the new representative BaSiH obtained from reacting the Zintl phase hydride BaSiH
with H
fluid at pressures above 4 GPa and subsequent decompression to ambient pressure. It consists of complex SiH
ions, which are octahedrally coordinated by Ba
counterions. The arrangement of Ba and Si atoms deviates only slightly from an ideal fcc NaCl structure. IR and Raman spectroscopy showed SiH bending and stretching modes in the ranges 800-1200 and 1400-1800 cm
, respectively. BaSiH is thermally stable up to 95
C above which decomposition into BaH and Si takes place. DFT calculations indicated a direct band gap of 2.5 eV. The discovery of BaSiH consolidates the compound class of hydridosilicates, accessible from hydrogenations of silicides at gigapascal pressures (
10 GPa). The structural properties of BaSiH suggest that it presents an intermediate (or precursor) for further hydrogenation at considerably higher pressures to the predicted superconducting polyhydride BaSiH.
Hu, F.-F.*; Qin, T.-Y.*; Ao, N.*; Xu, P. G.; Su, Y. H.; Parker, J. D.*; Shinohara, Takenao; Shobu, Takahisa; Kang, G.-Z.*; Ren, M.-M.; et al.
Journal of Traffic and Transportation Engineering, 25(2), p.75 - 93, 2025/04
InGeYokoyama, Akira*; Nakachi, Ryu*; Homma, Yoshiya*; Nakamura, Ai*; Shimizu, Yusei*; Li, D.*; Miyake, Atsushi*; Honda, Fuminori*; Aoki, Dai*; Onuki, Yoshichika*; et al.
Journal of the Physical Society of Japan, 94(2), p.023701_1 - 023701_4, 2025/02
Times Cited Count：1 Percentile：34.76(Physics, Multidisciplinary)Shimomura, Koichiro*; Koda, Akihiro*; Pant, A. D.*; Sunagawa, Hikaru*; Fujimori, Hiroshi*; Umegaki, Izumi*; Nakamura, Jumpei*; Fujihara, Masayoshi; Tampo, Motonobu*; Kawamura, Naritoshi*; et al.
Interactions (Internet), 245(1), p.31_1 - 31_6, 2024/12
Times Cited Count：4 Percentile：93.88(Physics, Atomic, Molecular & Chemical)Liu, P.-F.*; Li, X.*; Li, J.*; Zhu, J.*; Tong, Z.*; Kofu, Maiko*; Nirei, Masami; Xu, J.*; Yin, W.*; Wang, F.*; et al.
National Science Review, 11(12), p.nwae216_1 - nwae216_10, 2024/12
Times Cited Count：31 Percentile：91.47(Multidisciplinary Sciences)Fujishima, Yohei*; Anderson, D.*; Abe, Yu*; Alkebsi, L.*; Oka, Toshitaka; Tani, Atsushi*; Kranrod, C.*; Toyoda, Shin*; Hamasaki, Kanya*; Hirota, Seiko*; et al.
Nihon Hoshasen Jiko, Saigai Igakkai Zasshi, 7(1), p.21 - 26, 2024/12
no abstracts in English
Matsuba, Kenichi; Kato, Shinya; Kamiyama, Kenji; Akaev, A. S.*; Vurim, A. D.*; Baklanov, V. V.*
Proceedings of 31st International Conference on Nuclear Engineering (ICONE31) (Internet), 7 Pages, 2024/11
During a severe accident in sodium-cooled fast reactors, molten core materials could be discharged from the core region toward the lower sodium region of the reactor vessel through coolant channels, such as control rod guide tubes. Typical SFRs have a sodium plenum with limited depth and volume, such as the core inlet plenum located under the core region. Therefore, it is important to evaluate the coolability of molten core materials discharged into a depth- and volume-limited sodium plenum. In the present study, to deepen the understanding on the coolability of molten core materials discharged into such a sodium plenum, conditions under which molten core materials form solidified fragments were discussed based on an experiment discharging a molten fuel simulant (molten Al
O) into a test vessel filled with liquid sodium.
Brear, D. J.*; Kondo, Satoru; Sogabe, Joji; Tobita, Yoshiharu*; Kamiyama, Kenji
JAEA-Research 2024-009, 134 Pages, 2024/10
JAEA-Research-2024-009.pdf:2.45MB
The SIMMER-III/SIMMER-IV computer codes are being used for liquid-metal fast reactor (LMFR) core disruptive accident (CDA) analysis. The sequence of events predicted in a CDA is often influenced by the heat exchanges between LMFR materials, which are controlled by heat transfer coefficients (HTCs) in the respective materials. The mass transfer processes of melting and freezing, and vaporization and condensation are also controlled by HTCs. The complexities in determining HTCs in a multi-component and multi-phase system are the number of HTCs to be defined at binary contact areas of a fluid with other fluids and structure surfaces, and the modes of heat transfer taking into account different flow topologies representing flow regimes with and without structure. As a result, dozens of HTCs are evaluated in each mesh cell for the heat and mass transfer calculations. This report describes the role of HTCs in SIMMER-III/SIMMER-IV, the heat transfer correlations implemented and the calculation of HTCs in all topologies in multi-component, multi-phase flows. A complete description of the physical basis of HTCs and available experimental correlations is contained in Appendices to this report. The major achievement of the code assessment program conducted in parallel with code development is summarized with respect to HTC modeling to demonstrate that the coding is reliable and that the model is applicable to various multi-phase problems with and without reactor materials.
Zeng, Z.*; Zhou, C.*; Zhou, H.*; Han, L.*; Chi, R.*; Li, K.*; Kofu, Maiko; Nakajima, Kenji; Wei, Y.*; Zhang, W.*; et al.
Nature Physics, 20(7), p.1097 - 1102, 2024/07
Times Cited Count：33 Percentile：96.08(Physics, Multidisciplinary)