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Shi, D.*; Niu, X.*; Elakneswaran, Y.*; Li, A.*; 菊池 亮佑*; 平木 義久; 佐藤 淳也; 大杉 武史; Walkley, B.*
Journal of Nuclear Materials, 633, p.156997_1 - 156997_12, 2026/11
被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)During the retrieval of fuel debris and the treatment of contaminated water at the Fukushima Daiichi Nuclear Power Station, the generation of radioactive colloidal slurries containing iron and zirconium oxides is inevitable. This study investigates the solidification of these secondary wastes using a metakaolin geopolymer, exploring the reaction behaviour and immobilisation mechanisms of colloids with differing chemical activities within an alkali-activated system. While the introduction of metal colloids improved paste fluidity via the "ball-bearing effect", compressive strength was compromised due to interfacial defects. The 28-day leaching experiments revealed distinct immobilisation mechanisms for the two colloids. For chemically active Fe
O
colloids, a synergy of inner-sphere surface complexation and physical agglomeration was observed.
-isomeric states in seaborgium isotopesM
sat', P.*; Andel, B.*; Khuyagbaatar, J.*; 西尾 勝久; 他10名*
Physical Review C, 114(3), p.034321_1 - 034321_11, 2026/09
被引用回数：0The -isomeric states in the heaviest nuclei are one of the interesting topics in the superheavy element research. In the present work, we report on the discovery of 
-isomers in 
Sg. The isomeric states deexcite with half-lives of 120
s, 85
6 s, 8.5
s and 12.6
s measured for 
Sg, 
Sg, 
Sg and 
Sg, respectively, and are attributed to originate from high- states formed in the multi-quasiparticle couplings.
Ar and the shell closures at 
and 
Begala, M.*; Elekes, Z.*; 宇都野 穣; 他77名*
Journal of Physics G; Nuclear and Particle Physics, 53(7), p.075104_1 - 075104_9, 2026/07
被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)理化学研究所RIBFにて陽子ノックアウト反応を用いてArの励起状態を生成し、その不変質量測定によって非束縛状態の励起構造を調べた。実験結果を殻模型による理論計算と比較したところ、強く生成される状態の励起エネルギーや断面積をよく再現し、理論で予言される中性子数32,34での魔法数出現に対して実験からの支持を与えた。
Hg region; Derivative analysis approachKattikat Melcom, D. T.*; Tsekhanovich, I.*; Guezet, F.*; Andreyev, A.*; 西尾 勝久
Physical Review C, 114(1), p.014627_1 - 014627_8, 2026/07
被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)Existence of several fission modes (paths) comes from the nuclear structure of fissiong system, and it has been discussed from the measurement of fission-fragment mass (FFMD) and total kinetic energy (TKE) distributions. For some cases, especially fission from highly excited states, the obtained FFMDs are in general structureless, which makes the identification of fission modes ambiguous and analysis dependent. It has been thus desired to develop a robust analysis approach aiming at identification of a number of major fission modes in FFMDs. For this purpose, we propose a method to calculate the second derivative of FFMD. Number of detected minima on the second derivative curve is relevant to the number of fission modes and thus determines the structure of the fit function to be used for the FFMD and TKE data description. This approach was adopted to the high-energy fission of Hg, populated by the 
Ar+
Sm fusion reaction at the JAEA tandem facility. Compared to the previous analysis assuming only single asymmetric fission mode, the current approach shows also the signature of symmetric fission mode.
Cd
廣瀬 雄介; 本多 史憲*; 土塔 寛*; 河村 直己*; Kvashnina, K. O.*; Amidani, L.*; Uhl
ov
, K.*; Koloren
, J.*; Havela, L.*
Physical Review B, 113(24), p.L241103_1 - L241103_6, 2026/06
被引用回数：1 パーセンタイル：73.91(Materials Science, Multidisciplinary)The regime of valence fluctuations, known from anomalous rare-earth systems with slow fluctuations between two different fn states, has not yet been identified by microscopic techniques at any Uranium compound. The reason may be in the predominant band character of U intermetallic compounds. Here we present U-L3 and M4 X-ray absorption spectra taken on UPdCd, which is a heavy-Fermion antiferromagnet. Although it has only one type of U site, the spectra obtained in the High Energy Resolution Fluorescence Detection mode display two edges, each associated with different valence states, 5f2 and 5f3. This is strongly suggestive of slow f2 - f3 fluctuations on the timescale longer than the characteristic time of the spectroscopy technique. Unlike 4f systems in which such fluctuations lead to a destruction of magnetism due to involvement of one non-magnetic state, the f2 and f3 states in U are both possibly magnetic, allowing for the magnetic ordering in the fluctuating state. Such a new situation can bring more light into emergent phenomena observable in U systems at the verge of 5f localization.
S and 
SBegala, M.*; Elekes, Z.*; 宇都野 穣; 他75名*
Physical Review C, 113(6), p.064312_1 - 064312_9, 2026/06
被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)理化学研究所RIBFにて、いくつかの反応チャネルを用いたノックアウト反応によって、SとSの励起状態を生成し、そこからの脱励起ガンマ線の測定によって励起状態を得た。この結果を殻模型計算と比較した結果、実験データをよく説明することがわかった。特にSにおける低い
状態は、この原子核が三軸非対称変形をもっている可能性を示唆している。
Kyriakou, I.*; Papadopoulos, A.*; Polopetrakis, I.*; Kotroumbelou, C.*; Plante, I.*; 松谷 悠佑; 甲斐 健師; Qiu, R.*; Li, J.*; Kundrt, P.*; et al.
Physics in Medicine & Biology, 71(8), p.085009_1 - 085009_25, 2026/04
被引用回数：3 パーセンタイル：80.13(Engineering, Biomedical)過去40年間にわたり、液体の水を対象としたモンテカルロ飛跡構造(MCTS)コードが世界中で数多く開発されてきたが、相互作用断面積は大きく異なる。本研究では、6種類の異なるMCTSコードの使用による、液相水中の低エネルギー電子輸送の物理的特性(電子阻止能、経路長、dose-point-kernel、微視的線量付与)の不確実性を評価することを目指した。コード間比較の結果により、特に100eV以下の低エネルギー領域において、MCTSコード間で大きな差異があることが明らかになり、電子線が重要な役割を果たすDNA損傷シミュレーションの精度に影響を与えることが示された。本研究は、液相水中の低エネルギー電子輸送計算に伴う不確実性を低減するために、MCTSコードで使用される物理モデルの更なる開発の必要性を浮き彫りにしている。
Emerson, M. S.*; Lall-Ramnarine, S. I.*; Hatcher-Lamarre, J. L.*; Thomas, M. F.*; 神戸 正雄; Wu, B.*; Liang, M.*; Ramati, S.*; Wu, F.*; Margulis, C. J.*; et al.
Processes (Internet), 14(8), p.1208_1 - 1208_27, 2026/04
被引用回数：0 パーセンタイル：0.00(Engineering, Chemical)A diverse range of 4-dimethylaminopyridinium (DMAP) bis(trifluoromethylsulfonyl)-amide ionic liquids with specific functionalities (alkyl, alkoxy, hydroxyalkyl and benzyl) were designed, characterized and compared with their pyridinium analogs in terms of their physical and radiolytic properties. The influence of the dimethylamino group on ionic liquid structure was investigated by X-ray diffraction and molecular dynamics simulations. The influence of the electron-donating ability of the dimethylamino-substituted cation is evident in the differences in the electronic density of states between the DMAP and pyridinium ILs. This leads to substantial changes in the radical transients observed in pulse radiolysis of the neat ILs. It was found that the DMAP salts were higher melting, more viscous and less conducting than their pyridinium analogs. However, the DMAP salts exhibited higher thermal stabilities and could therefore be useful for high-temperature applications.
Guerinoni, E.*; 上田 祐生; 元川 竜平; Zemb, T.*; Pellet-Rostaing, S.*; Dourdain, S.*
Langmuir, 42(12), p.8313 - 8321, 2026/03
被引用回数：1 パーセンタイル：70.31(Chemistry, Multidisciplinary)Third phase formation in liquid-liquid extraction poses operational challenges by inducing organic phase separation, limiting extraction efficiency and process safety. Here, we employ combined ultra-small-angle X-ray (USAXS) and neutron scattering (USANS) to elucidate pre-transitional structures occurring during uranium extraction by tri-octylamine (TOA) in octane as diluent. SAXS highlights uranium-filled aggregates, while SANS captures all aggregates, regardless of uranium content. Extending the q-range from 0.004 to 3 
reveals two distinct populations: small spherical reverse micelle-like aggregates (radius 11 AA) and larger fluctuating domains exceeding 150 nm, consistent with Ornstein-Zernike critical fluctuations. Increasing TOA concentration amplifies these superstructures until divergence, the formation of a third phase. This study demonstrates that phase instability originates from the hierarchical condensation of water-filled aggregates around uranium-filled aggregates, rather than from simple micelle growth. Predicting such instability therefore requires accounting for the complete distribution of species, including water. The U-U distance in neighboring aggregate forming a supercluster is evidenced without ambiguity. Understanding such multiscale pre-transitional phenomena offers new routes to predict and mitigate phase separation in solvent extraction processes critical for nuclear fuel recycling.
Zn
MoO
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
被引用回数：4 パーセンタイル：94.75(Physics, Multidisciplinary)Lattice vibrations can carry angular momentum and magnetic moments under broken inversion or time-reversal symmetry, forming so-called chiral phonons. While such excitations have been explored in nonmagnetic systems via optical probes, their direct detection in magnetic materials and coupling to spin excitations remain largely unexplored. Here, using neutron spectroscopy, sensitive to both nuclear and magnetic scattering, we reveal the magnetic signature of chiral phonons in ferrimagnetic FeZnMoO with Curie temperature 
K. Below 
, we observe enhanced magnetic scattering of phonons at small momenta, arising from strong magnon-phonon coupling. In addition, out-of-plane intensity modulation, phonon mode splitting, and field-induced Zeeman shifts are observed, all closely associated with the ferrimagnetic order. These features vanish above , where phonon spectra are dominated by nuclear scattering. These observations demonstrate the existence of chiral phonons carrying substantial magnetic moments that directly contribute to magnetic scattering, and establish neutron spectroscopy as a powerful, momentum-resolved probe of their magnetic character.
Wells, S. R.*; 岩田 圭弘; 宮部 昌文; 長谷川 秀一*
Applied Physics B, 132(3), p.32_1 - 32_8, 2026/02
被引用回数：0 パーセンタイル：0.00(Optics)全角運動量J:0-1-0のレーザー共鳴イオン化スキームを用いて、直線偏光レーザーによるカルシウム原子の偶奇同位体選択性を調べた。2本のレーザー偏光を互いに直交させることで、主要同位体
Caのイオン化を抑制し、奇数同位体
Caが選択的にイオン化されることを確認した。Ca奇数同位体の分離係数は最大
程度と得られた。
C filler; Surfactant-driven interfacial and microstructural controlNiu, X.*; Elakneswaran, Y.*; 菊池 亮佑*; Li, A.*; Seralathan, S.*; 平木 義久; 佐藤 淳也; 大杉 武史; 加美山 隆*; Walkley, B.*
Cement and Concrete Research, 200, p.108096_1 - 108096_17, 2026/02
被引用回数：8 パーセンタイル：57.35(Construction & Building Technology)The incorporation of boron (B) as a neutron absorber into metakaolin-based geopolymers for the remediation of radioactive debris following nuclear accidents has attracted considerable attention. In this study, boron carbide (BC) was employed as a functional filler, while cetyltrimethylammonium bromide (CTAB) acted as both a dispersant and a stabiliser to enhance the neutron shielding properties of metakaolin-based geopolymers. Although the addition of BC improved processability via a roller-ball effect and had no discernible impact on the geopolymerisation process, its weakly polar, negatively charged surface led to the formation of a loose, weak-shell interfacial transition zone (ITZ) between the filler and the matrix, thereby reducing mechanical strength and chemical stability. In contrast, CTAB self-assembled into an interdigitated monolayer on the BC surface, reversing its surface charge to positive and promoting its uniform dispersion within the matrix. This work offers a promising approach for engineering high-performance, multifunctional geopolymer composites for nuclear and environmental applications.
Yao, X.*; Chen, P.*; Verma, R.*; Zhao, X.*; Yang, H.-Y.*; DeBeer-Schmitt, L.*; Aczel, A. A.*; Wu, C.-M.*; Alba Venero, D.*; 大原 高志; et al.
Physical Review Letters, 136(8), p.086702_1 - 086702_6, 2026/02
被引用回数：2 パーセンタイル：89.57(Physics, Multidisciplinary)We demonstrate that a multi-k incommensurate magnetic state in the Weyl semimetal CeAlGe gives rise to a singular angular magnetoresistance (SAMR), which is an electrical transport signature capable of detecting magnetic field direction with exceptional precision. In contrast, its sister compound CeAlSi is devoid of both multi-k order and SAMR. We reveal that both phenomena appear upon 57% Ge substitution in CeAlSi1-xGex and coincide with electronic structure changes that soften the single-ion in-plane anisotropy and enhance Weyl-mediated magnetic interactions. These results unveil a remarkable connection between band topology, electronic transport, and collective magnetism in Weyl semimetals.
Cantini, F.*; Ryan, J.*; Guidorzi, L.*; Magalini, M.*; Sans-Planell, O.*; Giudice, A. L.*; Garagiola, C.*; Re, A.*; Diana, E.*; 篠原 武尚*; et al.
Archaeological and Anthropological Sciences, 18(1), p.9_1 - 9_18, 2026/01
被引用回数：1 パーセンタイル：63.95(Anthropology)Iron artifacts from Japan's Kofun period (mid-3rd to early 7th century AD) are often recovered as heavily mineralized fragments, making it difficult to identify their original morphology and composition. Since archaeometallurgical studies require statistical analysis of many artifacts, non-destructive methods are essential. In this study, neutron tomography was applied to heavily mineralized iron sword fragments from Kofun-period tombs in Okayama Prefecture, Japan. The technique successfully visualized contrasts between iron-rich corrosion products and surrounding non-metal regions, enabling morphological analysis even when little metallic iron remained. Combined with neutron diffraction and X-ray techniques, the method provided new archaeometallurgical insights in a completely non-invasive manner.
Villagrasa, C.*; Baiocco, G.*; Chaoui, Z.-E.-A.*; Dingfelder, M.*; Incerti, S.*; Kundrt, P.*; Kyriakou, I.*; 松谷 悠佑; 甲斐 健師; Parisi, A.*; et al.
PLOS ONE (Internet), 21(1), p.e0340500_1 - e0340500_22, 2026/01
被引用回数：6 パーセンタイル：99.35(Multidisciplinary Sciences)電離放射線被ばくの生物学的影響を理解するために重要なナノ線量測定は、分子スケールでの原子相互作用を再現するMonte Carlo Track Structure (MCTS)コードにより評価可能である。数十年にわたり独立して開発された様々なMCTSコードは、生物組織の主成分である液体水中の電子線の相互作用について、異なる物理モデルと断面積データセットを使用してきた。本研究では、様々なMCTSコード内の相互作用断面積の違いによって生じるナノ線量測定計算の不確実性を評価した。7つのMCTSコード(Geant4-DNA, PARTRAC, PHITS, MCwater、およびPTra)の計算結果から、平均電離数や2回以上の電離が起こる確率などの分子スケールの物理量に大きな相違があることが明らかとなった。最も大きな相違が確認されたのは低エネルギー電子で、相互作用断面積の寄与が不確実性の主要因であることがわかった。本成果より、断面積の相違が複雑なDNA損傷などの生物学的影響に無視できない影響を与えることが浮き彫りになった。
FeO
Lenander, E. Y.*; Nielsen, F. B.*; Lass, J.*; Hansen, U. B.*; Krighaar, K. M. L.*; Preuss, A.*; Weber, T.*; Enderle, M.*; Jacobsen, H.*; Stuhr, U.*; et al.
Physical Review B, 113(1), p.014424_1 - 014424_14, 2026/01
被引用回数：1 パーセンタイル：73.91(Materials Science, Multidisciplinary)The frustrated magnet BiFeO has been reported to exhibit complex spin dynamics coexisting with conventional spin wave excitations. The magnetic Fe
(
) ions are arranged into a distorted two-dimensional Cairo pentagonal lattice with weak couplings between the layers, developing long-ranged noncollinear antiferromagnetic order below 245 K. In order to enable studies and modeling of the complex dynamics close to 
, we have reexamined the magnetic excitations across the complete energy scale (
meV) at 10 K. We discover two distinct gaps, which can be explained by introducing, respectively, easy axis and easy plane anisotropy on the two unequivalent Fe sites. We develop a refined spin Hamiltonian that accurately accounts for the dispersion of essentially all spin-wave branches across the full spectral range, except around 40 meV, where a splitting and dispersion are observed. Polarization analysis shows that the system has magnetic anisotropic fluctuations, consistent with our model. A continuum of scattering is observed above the spin wave branches and is found to principally be explained by an instrumental resolution effect. The full experimental mapping of the excitation spectrum and the refined spin Hamiltonian provides a foundation for future quantitative studies of spin waves coexisting with unconventional magnetic fluctuations in this frustrated magnet found at higher temperatures.
-delayed fission of 
Au
and an updated systematics in the region of neutron-deficient nucleiAndel, B.*; Andreyev, A. N.; Bara, S.*; 他60名*
Physical Review C, 113(1), p.014325_1 - 014325_11, 2026/01
被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)A study was conducted at ISOLDE-CERN to search for -delayed fission in 
and 
. Using advanced detection systems, high-statistics samples of 
nuclei were analyzed, and no fission fragments were detected. Thus, upper limits on the delayed fission probabilities for both isotopes (
and 
, respectively). These limits provide crucial data for understanding decay systematics in neutron-deficient nuclei.
Makarov, S. S.*; Zhakhovsky, V. V.*; Grigoryev, S. Yu.*; Chuprov, P.*; Pikuz, T. A.*; Inogamov, N. A.*; Khokhlov, V. A.*; Petrov, Y. V.*; Perov, E. A.*; Shepelev, V.*; et al.
Nature Communications (Internet), 16, p.11504_1 - 11504_13, 2025/12
被引用回数：2 パーセンタイル：40.34(Multidisciplinary Sciences)We demonstrate that a single 9-keV pulse from X-ray free-electron-laser can form a nanoscale mm-long cavity in LiF. The laser-generated shock pressure results in channel formation with >1,000 length-to-diameter aspect ratio. The development of void is analyzed via continuum and atomistic simulations revealing a sequence of processes leading to the final long cavity structure. This work presents the study of mm-long nanochannel formation by a single high-brilliance X-ray free-electron laser pulse.
Renaudi
e de Vaux, S.*; Li, S.*; Marrel, A.*; 江連 俊樹; 田中 正暁
Nuclear Engineering and Design, 444, p.114382_1 - 114381_15, 2025/12
被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)本研究では、PLANDTL-2において実施した8ケースのナトリウム中自然循環過渡試験結果について報告する。試験パラメータは、一次系の初期条件、二次系停止時の熱慣性および崩壊熱除去システム(DHRS)の運転モードである。試験の結果、DHRSによる急速冷却時にプレナム内の温度成層化の発達に伴う一次系冷却材の逆流がみられることを明らかにするとともに、崩壊熱除去システムの起動から温度成層化の発達までの遅延時間を推定する新たな手法を提案した。さらに、今回明らかになった不安定性を回避するための今後の研究指針を提示した。
C-stainless steel composites using the improved MPS methodAhmed, Z.*; Wu, S.*; Sharma, A.*; Kumar, R.*; 山野 秀将; Pellegrini, M.*; 横山 諒*; 岡本 孝司*
International Journal of Heat and Mass Transfer, 250, p.127343_1 - 127343_17, 2025/11
被引用回数：5 パーセンタイル：72.82(Thermodynamics)The study aims to measure boron concentration through the unidirectional diffusion of boron within the stainless steel (SS) layers while evaluating the updated model ability to replicate melt relocation behavior and geometry. In the current MPS simulations, one scenario employed dummy walls as heat sources, while another scenario used SS surface particles as heat sources to avoid interference with the melt flow as it reached the bottom of the specimen.
