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RhZhang, J. Z.*; Chen, Z. Q.*; Qu, T.*; Wang, Y. K.*; Li, Z. H.*; Orlandi, R.; 他62名*
Physics Letters B, 873, p.140144_1 - 140144_9, 2026/02
At the RIKEN, 
-delayed 
-ray spectroscopy studies were conducted on 
Rh and 
Rh, resulting in the world's first successful identification of a 1/2
isomer in these isotope, extending the energy difference between the 9/2
and 1/2 states up to neutron number 
=74. Comparison of the new results with state-of-the-art calculations suggests that triaxial deformation plays a significant role in the evolution of the energy difference, indicating a shape transition from axially symmetric to triaxial deformation within the Rh isotopic series. These findings provide new insights into the structure of neutron-rich nuclei in the atomic number 
region, elucidating the interplay between triaxial deformation and shell evolution.
原田 寛之; Saha, P. K.; 米田 仁紀*; 道根 百合奈*; 渕 葵*; 佐藤 篤*; 金正 倫計
Progress of Theoretical and Experimental Physics (Internet), 2026(2), p.023G01_1 - 023G01_17, 2026/02
大強度陽子加速器では、ビーム強度を制限するビーム損失を抑制すべく、ビーム形状を測定し、制御することが重要である。ビーム分布や形状を測定する従来のモニタは、金属などのワイヤーを用いた破壊型だが、ワイヤーの断線などにより大強度ビームを測定できていなかった。本研究では、ワイヤーではなく短パルスのレーザーを負水素イオンビームに照射し、付随する電子を1つ剥ぎ取り中性水素に変換し、その量を計測する。そして、照射タイミングを走査しながら、その測定を繰り返すことで時間方向のビーム形状(バンチシェイプ)を測定できる非破壊型のバンチシェイプモニタを考案した。考案したビーム形状モニタを実証すべく、レーザー光源を開発し、大強度ビームに対して照射実験した結果、今までにないレーザーによるバンチシェイプモニタの開発に成功した。
福永 久典*; 清野 良輔*; 松谷 悠佑; 高島 弘幸*; 石川 正純*; 小野寺 康仁*; 白土 博樹*; 宮田 治彦*; Prise, K. M.*
Medcomm (Internet), 7(1), p.e70568_1 - e70568_11, 2026/01
生殖毒性試験の主な目的は、医薬品、食品添加物、環境化学物質などの異物投与が生体の生殖機能に悪影響を及ぼすかを評価することである。試験による結果は、人間の生殖健康に対する潜在的リスクを評価する科学的根拠として応用可能である。そこで本研究では、生殖毒性を評価するための新しいルシフェラーゼレポーターマウスモデルを開発した。本開発により、マウスの安楽死を必要とせずに、精子に含まれるタンパク質分解酵素(アクロシン)の生体内イメージングを通じて男性の生殖能力を長期的かつ定量的に評価することに成功した。本アプローチは、生殖毒性の発現と回復の根底にあるメカニズムの理解を深めるのに役立つ。さらに本開発により、研究評価に使用する動物数を減らし、動物研究における3Rのコアコンポーネントの1つである「削減」の原則に貢献する。
Fe
O
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
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.
Catumba, G.*; 平口 敦基; Hou, G. W.-S.*; Jansen, K.*; Kao, Y.-J.*; David Lin, C.-J.*; Ramos, A.*; Sarkar, M.*
Proceedings of Science (Internet), 466, p.145_1 - 145_10, 2025/12
SU(2)ゲージ場を持つカストディアル2ヒッグス二重項模型を格子上で研究する。この模型は標準模型と同じ大域的対称性を持つが、ヒッグス場が追加されることでスカラースペクトルが拡大し、大域的対称性の自発的破れが発生する可能性が出てくる。カストディアル2ヒッグス二重項模型のスペクトルと走るゲージ結合定数を、カットオフが300から600GeVで標準模型での物理量が一定となる線上で研究した。結果として追加したBSMスカラー場の実現可能な質量の下限は、Wボソンの質量よりはるかに小さいことがわかった。そして、この研究で選択した4点相互作用の結合定数では、BSM状態の1つに対する推定された下限質量は約
0.2
で、カットオフに依存しないことがわかった。
出井 俊太郎; 柴田 真仁*; 根岸 久美*; 杉浦 佑樹; 天野 由記; Bateman, K.*; Wilson, J.*; 横山 立憲; 鏡味 沙耶; 武田 匡樹; et al.
Results in Earth Sciences (Internet), 3, p.100097_1 - 100097_16, 2025/12
高レベル放射性廃棄物の地層処分において、セメントと泥岩の相互作用による化学的擾乱領域が形成され、岩盤中の核種移行特性に影響を及ぼす可能性がある。本研究では、11年前に幌延深地層研究センターの140m調査坑道に施工されたセメント(普通ポルトランドセメント(OPC)および低アルカリ性セメント(LAC))と泥岩の界面における変質状態について調査した。複数の分析手法を組み合わせることで、セメントの溶解、方解石やC-(A-)S-H相などの二次鉱物の析出、モンモリロナイトの陽イオン交換、泥岩の空隙率の低下など、セメントと岩石の界面における主要な反応が特定された。また、空隙率の低下による拡散の低下や、変質した泥岩中の二次鉱物への取り込みによる収着の促進など、セメントと泥岩の相互作用が放射性核種の移行に及ぼす影響についても明らかになった。
Woloszczuk, K.*; Maik, P.*; Safronov, A.*; Wieczorek, A.*; 森下 祐樹; 眞田 幸尚; Szklarski, L.*
Zeszyty Naukowe SGSP, 2(96), p.105 - 121, 2025/12
In an era of rapidly evolving Chemical, Biological, Radiological and Nuclear (CBRN) threats, integrated detection systems using real-time data fusion are increasingly essential for public safety. This article examines how sensor integration enhances the accuracy and timeliness of CBRN measurements, focusing on radiological detection as a representative case. Through literature review, prototype development and laboratory evaluations in an accredited facility, the study shows that combining multiple sensor outputs-such as dose-rate data and gamma spectra-reduces false positives and improves situational awareness for first responders. The results highlight the value of modular system architectures that unify heterogeneous sensor data into standardised formats, supporting faster decision-making at both tactical and command levels. Advanced calibration, real-time processing and peak-detection algorithms further enhance measurement reliability across a wide dose range. Providing concise, context-relevant data to on-site teams while retaining richer datasets for strategic use also helps prevent cognitive overload during emergencies. These outcomes form a basis for extending the integrated framework to other CBRN agents and for scaling to complex real-world environments.
舘 幸男; 青柳 和平; 尾崎 裕介; 早野 明; 大野 宏和; 武田 匡樹; 望月 陽人; 出井 俊太郎; 三中 淳平; 村上 裕晃; et al.
NEA/NE(2025)20 (Internet), 118 Pages, 2025/11
This interim report summarises the research activity which was carried out in the Phase 1 (February 2023 to March 2025) of the Horonobe International Project (HIP), which utilises an underground facility for the research and development of geological disposal at the town of Horonobe in Hokkaido. The aims of this project are to develop and demonstrate advanced technologies to be used in repository design, operation, closure, and a realistic safety assessment in deep geological disposal. In Task A (Solute transport experiment with model testing), the fracture distribution, transmissivity, and connectivity were evaluated prior to the in situ tracer test at a depth of 250 m. Then, two types of in situ tracer tests were successfully carried out and breakthrough curves using sorbing and non-sorbing tracers were successfully obtained. In Task B (Systematic integration of repository technology options), the distribution of fractures or faults, development of the excavation damaged zone, and water inflow from fracture during excavation were predicted prior to the excavation of the gallery at 500 m depth. In Task C (Full-scale engineered barrier system dismantling experiment), data acquisition of the full-scale engineered barrier system experiment performed at 350 m depth was continued. The research results in this interim report will contribute to the further development of preliminary safety assessments of the geological disposal project.
K
nstle, K.*; 山本 慧; 他7名*
Nature Communications (Internet), 16, p.10116_1 - 10116_8, 2025/11
Strong coupling between distinct quasiparticles in condensed matter systems gives rise to hybrid states with emergent properties. We demonstrate the hybridization of confined phonons and finite-wavelength magnons, forming a magnon-polaron cavity with tunable coupling strength and spatial confinement controlled by the applied magnetic field direction. Our platform consists of a low-loss, single-crystalline yttrium iron garnet (YIG) film coupled to a zinc oxide (ZnO)-based surface acoustic wave (SAW) resonator. This heterostructure enables exceptionally low magnon-polaron dissipation rates below 
/2
1.5 MHz. The observed mode hybridization is well described by a phenomenological model incorporating the spatial profiles of magnon and phonon modes. Furthermore, we report the first observation of Rabi-like oscillations in a coupled SAW-spin wave system, revealing the dynamical formation of magnon-polarons in the time domain. These results establish a platform for engineering hybrid spin-acoustic excitations in extended magnetic systems and enable time-resolved studies of magnon-polaron states.
Reiser, J. T.*; Neeway, J. J.*; Cooley, S. K.*; Parruzot, B.*; Heredia-Langner, A.*; Gin, S.*; Thomas, M.*; Smith, N. J.*; Icenhower, J. P.*; Stone-Weiss, N.*; et al.
International Journal of Applied Glass Science, 16(4), p.e16707_1 - e16707_16, 2025/10
被引用回数：0 パーセンタイル：0.00(Materials Science, Ceramics)A new technique, termed the stirred-reactor coupon analysis (SRCA) method, has been developed to measure the rate of glass dissolution in forward-rate conditions. Monolithic glass coupons are partially masked with an inert material before placement in a large volume of well-mixed solution with known chemistry and temperature for a predetermined duration. After the test, the mask is removed, and the difference in step height between the protected area and the exposed corroded portions of the sample coupon is measured to determine the extent of glass dissolution. The step height is converted to a rate measurement using the test duration and glass density. Test parameters such as sample surface preparation and test duration were evaluated to determine their effects on the measured rates. Additionally, results from an interlaboratory study (ILS) consisting of 12 laboratories from 11 different institutions are presented, where each laboratory performed 12 independent tests. When removing experimental outlier data, the 95% reproducibility limits for the SRCA method has no statistical difference with previously published standardized test methods used to determine the forward rate of glass dissolution. Overall, this paper describes steps necessary to perform the test method and provides the statistical calculations to evaluate test accuracy.
Jeong, S. G.*; Kwon, J.*; Kim, E. S.*; Prasad, K.*; Harjo, S.; Gong, W.; 川崎 卓郎; Estrin, Y.*; Bouaziz, O.*; Hong, S. I.*; et al.
Materials Science & Engineering A, 942, p.148712_1 - 148712_11, 2025/10
The cellular structure plays a key role in determining the mechanical properties of metal additive manufacturing (MAM) components. This study presents in situ neutron diffraction and dislocation density-based modeling for a CoCrFeMnNi high-entropy alloy (HEA) made via directed energy deposition (DED). A constitutive model based on the Kocks-Mecking-Estrin framework was used to represent the cellular structure. Parametric analysis showed lower dislocation accumulation and annihilation rates in the as-built sample (with cellular structure) than in the heat-treated one. These differences are linked to dislocation forest networks and local stacking fault energy variations. Dislocation density across cell interiors and walls was also compared with deformation-induced dislocation cells.
社本 真一; Shin, K.*; 赤津 光洋*; 今井 正樹; 植田 大地*; 横尾 哲也*; 根本 祐一*; Hassan, A. M. A.*; Chang, L.-J.*; 家田 淳一; et al.
Applied Physics Letters, 127(13), p.132403_1 - 132403_5, 2025/09
FeTiO is an ilumenite antiferromagnetic insulator with Fe
. Two-dimensional ferromagnetic honeycomb layers are antifferomagnetically stacked along the 
-axis. The magnetic Bragg peak intensity is enhanced by ultrasound injection up to 300 % on the FeTiO crystal at low temperatures. The large enhancement is attributed to the large spin-lattice coupling of Fe in FeTiO. The enhancement is lost above 35 K, suggesting that the energy splitting of the Fe levels by the spin-orbit coupling is about 35 K. This finding opens a possibility for high efficiency acoustic spin pumping.
Che, G.*; Tang, X.*; Liu, J.*; Lang, P.*; Fei, Y.*; Yang, X.*; Wang, Y.*; Gao, D.*; Wang, X.*; Ju, J.*; et al.
Nano Letters, 25(39), p.14467 - 14472, 2025/09
機械化学的ラジカル重合は、溶媒消費量の削減と不溶性モノマーへの適応性により、ポリマー合成において独自の利点を有する。しかしながら、反応中に生成ポリマーが制御不能に分解するという課題があり、精密な制御性を備えた新たな合成戦略の開発が求められている。本研究では、最大30GPaの高静圧を適用することで、1,3,5-トリフルオロベンゼンが共役結合を切断するラジカル重合を起こし、高選択性でカーボンナノスレッド(ポリマーI多形体)を形成することを発見した。閾値圧力における結晶構造と結合経路の計算エネルギー障壁に基づき、ベンゼン環が1-2ラジカル重合経路で反応すると結論付けた。本研究は、極めて安定な芳香族化合物に対しても固相ラジカル重合を開始する堅牢な手法として高圧が有効であることを示し、高選択性を持つ炭素系高分子材料の合成に向けた新たな知見を提供する。
江崎 蘭世; Go, G.*; Kim, S. K.*
Physical Review B, 112(10), p.104440_1 - 104440_10, 2025/09
In this study, we theoretically demonstrate that thermally excited magnons can induce scalar spin chirality (SSC) even in collinear spin systems. We show both numerically and analytically that the SSC increases with the magnitude of DMI and temperature and reveal that the magnon-induced SSC can achieve a magnitude comparable to those observed in non-coplanar spin configurations. These findings suggest that SSC plays a significant role even in collinear spin systems, providing new insights into the chiral physics of magnetic materials.
S
studied by X-ray magnetic circular dichroismVerma, V. K.*; 芝田 悟朗; 藤森 淳*; 他8名*
Physical Review B, 112(10), p.104444_1 - 104444_8, 2025/09
We have investigated the element specific magnetic characteristics of single-crystal FeCrS using X-ray magnetic circular dichroism (XMCD). We have found that the Fe L2,3-edge XAS spectra do not exhibit clear multiplet structures, indicating strong hybridization between the Fe 3d and S 3p orbitals, leading to delocalized rather than localized electronic states. The Fe 3d and Cr 3d spin moments are antiferromagnetically coupled, consistent with the Goodenough-Kanamori rule. The orbital magnetic moments of Fe and Cr are determined to be -0.23 and -0.017 
B/ion, respectively. The large orbital magnetic moment of Fe is due to the d6 configuration under the relatively weak tetrahedra crystal field at the Fe site, and the delocalized Fe electrons maintain the orbital degree of freedom in spite of their itinerant nature. On the other hand, the octahedral crystal-field splitting of the Cr 3d level is large enough to result in the quenching of the orbital moment of the Cr ion in FeCrS.
竹内 祐太朗*; 佐藤 佑磨*; 山根 結太*; Yoon, J.-Y.*; 菅野 之矩*; 内村 友宏*; De Zoysa, K. V.*; Han, J.*; 金井 駿*; 家田 淳一; et al.
Science, 389(6762), p.830 - 834, 2025/08
被引用回数：0 パーセンタイル：77.58Electric current driving of antiferromagnetic states at radio or higher frequencies remains challenging to achieve. In this study, we report all-electrical, gigahertz-range coherent driving of chiral antiferromagnet manganese-tin (Mn
Sn) nanodot samples. High coherence in multiple trials and threshold current insensitive to pulse width, in contrast to results observed with ferromagnets, were achieved in subnanosecond range, allowing 1000/1000 switching by 0.1-nanosecond pulses at zero field. These features are attributed to the inertial nature of antiferromagnetic excitations. Our study highlights the potential of antiferromagnetic spintronics to combine high speed and high efficiency in magnetic device operations.
Chauvin, N.*; Martin, P.*; 尾形 孝成*; Calabrese, R.*; Janney, D.*; 廣岡 瞬; 加藤 正人; Staicu, D.*; McClellan, K.*; White, J.*; et al.
NEA/NSC/R(2024)1 (Internet), 289 Pages, 2025/07
OECD/NEAのWorking Party on Scientific Issues of Advanced Fuel Cycles(WPFD)/Expert Group on Innovative Fuel Elementsでは、各国の核燃料研究の専門家による協力のもとで、酸化物及び金属燃料を対象とした推奨燃料物性値を取りまとめ、燃料照射挙動解析コードのベンチマークに反映する活動を行ってきた。本報告は、公開文献をベースに推奨燃料物性値を取りまとめたものであり、格子定数、融点、熱膨張、熱伝導率、比熱、弾性率、酸素ポテンシャル及び相変化について、物性値、評価式及びそれらの適用範囲を示す。
Sn using the GRIFFIN spectrometer at TRIUMFSyeda, N. K.*; Smallcombe, J.; 他44名*
Nuclear Physics A, 1059, p.123090_1 - 123090_5, 2025/07
The semi-magic 
Sn isotopes display signs of shape coexistence in their excited 0
states, which, in contrast to the spherical 0 ground states, are deformed. This paper investigates the nuclear structure of Sn using the competing decay and electron capture of a radioactive beam of Sb produced at the TRIUMF-ISAC facility using the GRIFFIN spectrometer. This study will allow for an in-depth understanding of the excited 0 states in Sn, by focusing on their decay patterns. In the present experiment, transitions at 856.2-keV and 1405.0-keV, which were observed in an earlier decay study but not placed in the Sn level scheme, have been assigned to the level scheme in connection to the 0 3 level at 2156.0-keV. Properly assigning these transitions refines the level scheme and enhances our understanding of the nuclear structure in Sn.
Saha, P. K.; 原田 寛之; 田村 文彦; 岡部 晃大; 吉本 政弘; 菖蒲田 義博; 沖田 英史; 小島 邦洸; 仲野谷 孝充; 畠山 衆一郎; et al.
Physical Review Accelerators and Beams (Internet), 28(7), p.074201_1 - 074201_23, 2025/07
In this research, the beam loss in the J-PARC 3-GeV Rapid Cycling Synchrotron (RCS) has been significantly mitigated at the designed 1 MW beam power. It was possible by identifying all beam loss sources and implementing appropriate measures based on numerical simulations and systematic beam studies. The major one includes of using a smaller size charge-exchange foil and optimizing the injection beam to minimize foil scattering uncontrolled beam loss, modifications of the transverse and longitudinal beam painting parameters to mitigate the high-intensity effects. The beam loss as compared to 1 MW trial operation in 2020 was 80% reduced and perfectly localized at the designated collimator area. The beam loss power is only less than 0.1 kW as compared to the collimator limit of 4 kW. As a result. the residual radiation throughout the ring is substantially reduced for achieving a sustainable operation of the RCS with nearly 99% availability.
Lin, Z. M.*; Liu, B. X.*; Ming, K. S.*; 徐 平光; Yin, F. X.*; Zheng, S. J.*
Scripta Materialia, 263, p.116692_1 - 116692_7, 2025/07
被引用回数：2 パーセンタイル：76.41(Nanoscience & Nanotechnology)Complementary layer thickness effects on strength and plasticity in Q235 and SUS304 steels provide a novel strategy to realize high strength and high plasticity of heterogeneous Q235/SUS304 multilayered steel. In this work, the tensile deformation behaviors and fracture characteristics of vacuum hot-rolled Q235/SUS304 multilayered steel with various layer thicknesses ranging from 223 m to 5 m were deeply investigated. The tensile strength improved with the reduction of layer thickness, and the uniform elongation were first increasing and then decreasing with the decrease of layer thickness, and the peak value appeared at the layer thickness of 20 m. Interestingly, the fracture elongation forms a high plateau value within the 1020 m range. Further analysis reveals that the severe strain localization in the brittle SUS304 thin layers is delayed by the ductile Q235 layers, which is mainly attributed to the different texture evolution and dislocation configuration characteristics during tensile deformation.
