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報告書

大熊分析・研究センター 放射性物質分析・研究施設第1棟 建設工事報告書

真道 隆治; 市村 隆人; 野澤 芳彦; 小森 剛史; 良知 玲生奈; 北原 勝美*; 中村 智樹*; 小池 彰弘*

JAEA-Technology 2026-005, 379 Pages, 2026/08

JAEA-Technology-2026-005.pdf:45.42MB

放射性物質分析・研究施設第1棟は、東京電力ホールディングス株式会社福島第一原子力発電所の廃炉作業で発生する放射線量が低・中線量の瓦礫類、伐採木、焼却灰、汚染水処理に伴う二次廃棄物等の性状を把握することにより、処理・処分方策とその安全性に関する技術的な見通し等を得るための分析、試験を行う。また、ALPS処理水の海洋放出に関し、東京電力HDから独立した第三者の立場で放出前のALPS処理水分析を行うことを目的に、1F特定原子力施設の一部として2017年(平成29年)1月から2022年(令和4年)6月にかけて日本原子力研究開発機構が整備を行った施設である。第1棟の建設工事は、建築工事、電気設備工事、機械設備工事により建屋の建設を行う「建屋工事」と、鉄セル、グローブボックス、フード等の分析設備の整備を行う「内装設備工事」に区分される。本報告書は、大熊建設室が担当した「建屋工事」に関する工事記録等をまとめたものである。建屋工事の各工種における品質管理、施工状況等の他、コンポジット調整、安全・施工品質管理に関する実施体制・手法、許認可(実施計画変更、建築確認申請、林地開発許可等)等、原子力施設の建設に係る施工管理について技術的観点からの経験・知見を網羅的に取りまとめた。また、1F敷地内・帰還困難区域における建設といった特殊環境下での建設における放射線管理等の特異な管理内容等についてもまとめた。今後、第1棟のような原子力施設整備において、本報告が施設整備の参考として、課題の抽出や合理的な施設計画に寄与することを期待する。

論文

Applicability of subcritical water treatment for degradation of spent tannin-based uranium adsorbent; Fundamental research

岩本 敏広; 大森 康平; 荒井 陽一; 船越 智雅; 渡部 創; 中村 雅弘; 渡邉 賢*

Mechanical Engineering Journal (Internet), 13(4-S1), p.25-00391_1 - 25-00391_8, 2026/08

https://doi.org/10.1299/mej.25-00391

TANNIX loaded with uranium and nitric acid ions has accumulated as a secondary waste of radioactive water decontamination. Establishment of treatment procedure of the spent TANNIX is an important issue for facility management. In this study, applicability of the subcritical water treatment for the spent TANNIX decomposition was experimentally examined. As the results, temperature conditions contributed significantly to the decomposition efficiency, and the solid-liquid ratio had a limited effect. The decomposition rate tends to decrease as the test time increases, suggesting that decomposition preferentially occurs around at functional groups. These experimental results showed that most of the TANNIX could be decomposed at high temperatures and longer reaction times. This study demonstrated that hydrothermal reactions can be used both to recover uranium from TANNIX and to decompose it.

論文

NMR evidence for spontaneous electronic chiral order in URhSn

徳永 陽; 石飛 尊之; 酒井 宏典; 神戸 振作*; 播磨 尚朝*; 仲村 愛*; Maurya, A.*; Li, D.*; 本間 佳哉*; 本多 史憲*; et al.

Physical Review Letters, 137(4), p.046501_1 - 046501_6, 2026/07

https://doi.org/10.1103/1vjx-4jfv
 被引用回数：1

URhSn exhibits successive phase transitions at $$T_O$$ = 54 K and $$T_C$$ = 16 K. While the transition at $$T_C$$ is known to be ferromagnetic, the nature of the intermediate phase between $$T_O$$ and $$T_C$$ has remained elusive. Here, we report $$^{117}$$Sn nuclear magnetic resonance (NMR) measurements on high-quality single crystals of URhSn, which reveal NMR line splittings indicative of symmetry breaking in the intermediate phase. The field-direction and site dependences of these splittings are consistent with antiferroquadrupolar ordering characterized by the space group P321 (No.150). This finding confirms the emergence of a novel form of chiral order driven by electronic degrees of freedom, without an underlying chiral crystal structure in URhSn.

論文

Structural and thermal confinement of Schwarz crystals

Huang, D.*; Fu, H.*; Lyu, M.*; Feng, Y.*; 梶本 亮一; 中村 充孝; 本田 孝志*; Liu, E.*; Li, B.*; Li, X.*; et al.

Physical Review Research (Internet), 8(3), p.033017_1 - 033017_7, 2026/07

https://doi.org/10.1103/lqy2-cshl

As a nontrivial state of solid, Schwarz crystal manifests itself in extremely refined nanograins and triply periodic minimal surface (TPMS) grain boundaries, and therefore exceptional thermal and mechanical stability. However, it remains unexploited how the structural units interact and thermal transport is influenced by such complex atomic structures. Here, we investigate Schwarz crystals of Cu and Pt using neutron scattering and thermal transport measurements. Pair distribution function analysis reveals the coexistence of compressed grains and expanded TPMS grain-boundary regions, forming a spatially confined atomic environment. This leads to an unusual phonon hardening suggested by inelastic neutron scattering. As bulk materials, Schwarz crystals exhibit a quasilinear temperature dependence of thermal conductivity, which was previously only observed in low-dimensional materials. This contrast indicates that the spatial confinement of the Schwarz crystals plays a crucial role in determining the unique thermal conductivity, which also provides an emergent route to regulate thermal properties in bulk materials.

論文

Stress classification approach for failure modes of piping elbows under seismic loads

滝藤 聖崇; 古屋 治*; 中村 いずみ*; 奥田 幸彦; 山崎 達広

Proceedings of the ASME 2026 Pressure Vessels & Piping Conference (PVP2026) (Internet), 8 Pages, 2026/07

For seismic design of piping system, stress limits are set to prevent different types of failure through stress classification. The primary stress limit prevents ductile fracture and plastic collapse, and the secondary stress limit prevents ratchet deformation. Furthermore, the primary, secondary and peak stress limits are employed to prevent fatigue. Fatigue is often the dominant failure mode for piping subjected to seismic loads, so these limits are evaluated when determining the allowable state of the system. Nevertheless, further research on piping failure mechanisms i.e., fatigue, ratcheting, and plastic collapse, under dynamic loads that exceed the design basis event (BDBE) is still required. Consequently, the authors investigated elbow; piping failure modes by means of shaking table tests. The test results showed that failure modes depended on the dead weight and the level of input acceleration. An evaluation method was then developed to interpret the test data and to quantify the relationship between load combinations and failure modes. The method adopts a stress classification approach that incorporates an elastic follow up factor, q. The proposed method was applied to elbows that exhibited ratcheting deformation and plastic collapse during the shaking table tests. By using the stress classification approach, the method successfully reproduced the observed failure modes. This approach can therefore provide valuable insight for improving seismic fragility assessments of piping systems.

論文

Measurements of circular polarization from the 0.75-eV p-wave resonance of the $$^{139}$$La(n,$$gamma$$)$$^{140}$$La reaction

遠藤 駿典; 藤岡 宏之*; 後藤 優*; 猪野 隆*; 岩本 修; 岩本 信之; 河村 しほり*; 木村 敦; 北口 雅暁*; 小林 龍珠; et al.

JPS Conference Proceedings (Internet), 45, p.011056_1 - 011056_8, 2026/06

https://doi.org/10.7566/JPSCP.45.011056

The NOPTREX collaboration aims to search for time-reversal symmetry breaking (T-violation) using compound nuclear reactions. To elucidate the mechanism of T-violation in compound nuclear reactions, we are measuring the spin-angle correlation term of the (n,$$gamma$$) reaction. We have already successfully measured the angular distribution and transverse asymmetry of emitted gamma-rays for several nuclei, such as $$^{139}$$La and $$^{117}$$Sn. As the next step, we measured the circular polarization of the emitted gamma-rays from the 0.75-eV p-wave resonance of $$^{139}$$La(n,$$gamma$$)$$^{140}$$La reactions. The measurements were performed at J-PARC MLF BL04 (ANNRI). The circular polarization of gamma-rays was measured using the developed gamma-ray polarimeter. Although the circular polarization observed was weak, this first measurement on the resonances allowed us to place limits on the circular polarization from the p-wave resonance. In this presentation, we will report the details of the experiment and future plans.

論文

Magnetic phase diagram and Fermi surface properties of the heavy-fermion antiferromagnet UPd$$_{2}$$Cd$$_{20}$$

廣瀬 雄介; 土塔 寛*; 竹内 徹也*; 三宅 厚志*; 徳永 将史*; 仲村 愛*; 本間 佳哉*; 青木 大*; 本多 史憲*; 摂待 力生*

Journal of Physics; Condensed Matter, 38(24), p.245601_1 - 245601_11, 2026/06

https://doi.org/10.1088/1361-648X/ae72e0
 被引用回数：0 パーセンタイル：0.00(Physics, Condensed Matter)

The electronic state of UPd$$_{2}$$Cd$$_{20}$$, which exhibits a magnetic transition at $$T$$$$_{rm N}$$ $$sim$$ 5 K, is investigated by means of transport, high-field magnetization up to 55 T, specific heat in magnetic fields, and de Haas-van Alphen (dHvA) measurements, and compared with the non-5f compound ThPd$$_{2}$$Cd$$_{20}$$. A metamagnetic transition is observed at $$mu$$$$_{0}$$$$H_{rm c}$$ $$sim$$ 15-20 T, which continuously connects to $$T$$$$_{rm N}$$ in the H-T phase diagram. Although the magnetization reaches large values at high fields, the ordered magnetic moment is estimated to be small from small anomalies in specific heat at $$T$$$$_{rm N}$$ and in magnetization at $$T$$$$_{rm c}$$. The observed dHvA frequencies reveal enhanced cyclotron effective masses of 30 $$m_{0}$$, which are much heavier than those in ThPd$$_{2}$$Cd$$_{20}$$. These experimental results indicate that 5f-derived bands contribute to the large electronic specific heat coefficient of 670 mJ/mol K$$^{2}$$, demonstrating the dual localized-itinerant character of 5f electrons in UPd$$_{2}$$Cd$$_{20}$$.

論文

Incommensurate magnetic ordered phase with enhanced low-temperature magnetic specific heat in SmAu$$_{3}$$Al$$_{7}$$

東中 隆二*; Iwami, Takuma*; Saito, Kosuke*; 伊藤 孝; 田端 千紘; 金子 耕士; 大原 高志; 鬼柳 亮嗣; 中尾 朗子*; 中村 惇平*; et al.

Journal of the Physical Society of Japan, 95(6), p.063702_1 - 063702_5, 2026/06

https://doi.org/10.7566/JPSJ.95.063702
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

Neutron scattering and muon spin rotation (mSR) measurements on single-crystal SmAu$$_{3}$$Al$$_{7}$$ reveal magnetically ordered states associated with successive transitions at 2.8 K and 0.9 K. Magnetic Bragg peaks appear below TN with an incommensurate propagation vector q = (0.30, 0, 1.33). mSR detects spontaneous internal fields below 2.8 K, and the spectral shape is consistent with the incommensurate magnetic ordering. No anomalies are observed at 0.9 K, indicating that the magnetic structure remains essentially unchanged.

論文

Magnetic signature of chiral phonons revealed by neutron spectroscopy in ferrimagnetic Fe$$_{1.75}$$Zn$$_{0.25}$$Mo$$_{3}$$O$$_{8}$$

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

https://doi.org/10.1103/pq5m-32wj
 被引用回数：3 パーセンタイル：96.14(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 Fe$$_{1.75}$$Zn$$_{0.25}$$Mo$$_{3}$$O$$_{8}$$ with Curie temperature $$T_C sim 49$$ K. Below $$T_C$$, 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 $$T_C$$, 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.

論文

原子力機構-東海タンデム加速器の現状

中川 創平; 株本 裕史; 沓掛 健一; 乙川 義憲; 遊津 拓洋; 松井 泰; 池亀 拓麻; 加藤 佑太; 中村 暢彦

Proceedings of 22nd Annual Meeting of Particle Accelerator Society of Japan (インターネット), p.1034 - 1038, 2026/03

https://www.pasj.jp/web_publish/pasj2025/proceedings/PDF/WHP0/WHP017.pdf

原子力機構-東海タンデム加速器施設は最高運転電圧が約18MVの大型静電加速器で、重イオンビーム等を用いた核物理、核化学、原子物理、材料照射などの各分野で利用されている。本発表では、2024年度における加速器の運転・整備状況及びビーム利用開発等について報告する。2024年度の運転状況は、例年よりも運転日数が減少傾向となった。静電加速器の絶縁ガスとして六フッ化硫黄ガス(SF$$_6$$)を使用しており、高圧ガス施設の定期自主検査において貯槽の開放検査のために整備期間を長く要したこと、空調系制御盤のトランスの焼損(火災)が発生し、対応に時間を要したこと、絶縁ガスを冷却する冷凍機が故障し、運転を行えなくなったことが主な原因である。整備関係では、高電圧端子に設置されているECR(Electron Cyclotron Resonance)イオン源のオーバーホール及び新規イオン用のガスの搭載を行った。加速器の開発として、高速中性子により制御系のエラーが発生している可能性があるため、パラフィンによる高速中性子の遮蔽効果を確認する測定を行い、中性子数を半数程度に減らすことができることを示唆する結果を得た。新規利用分野のための設備導入として、低フラックスビームの照射設備を整備した。近年、人工衛星を始めとする宇宙用機器に使用する半導体等へイオンビームを照射するソフトエラー試験などの需要が高まっている。100cpsの低フラックスビームを、数cm$$^2$$で一様に照射する必要があり、利用者と共同でビーム制御・診断、照射チャンバーの設置等の試験準備を行った。

論文

設計想定を超える地震荷重を想定した配管エルボの損傷モード(配管要素加振試験の紹介)

滝藤 聖崇; 奥田 幸彦; 中村 いずみ*; 古屋 治*

配管技術, 68(2), p.1 - 7, 2026/02

自然災害起因の産業事故はNatech (Natural hazard triggered technological accidents)と呼ばれ、近年その重要性が認識されつつある。Natechリスクの評価と適切な対策には構造物の損傷モードの把握と損傷モードと維持機能との対応付けが必要であるが、産業施設で使用される機械設備類では試験データや解析事例が不足しており、そのような性能評価が難しい。そこで、産業施設で多用される配管系の地震時挙動を対象とし、試験による損傷モードの把握と維持機能との対応付けを試みる研究を実施した。まずは代表的な配管構成要素であるエルボ配管の動的載荷時における損傷モードを調査するために、加振レベルおよび自重をパラメタとした複数の動的載荷試験(加振試験)を実施した。本稿では研究の全体概要および配管エルボの加振試験結果について報告する。

論文

Introduction to the simulation disaster challenge of world robot summit harsh environment F-REI challenge pre-tournament event

中村 啓太*; 鈴木 健太; 金子 瑛一郎*; 阿部 佳峻*; 清水 優*; 大金 一二*

Journal of Robotics and Mechatronics, 38(1), p.192 - 201, 2026/02

https://doi.org/10.20965/jrm.2026.p0192

This paper shows the design and results of a Simulation Disaster Challenge held at the Fukushima Robot Test Field in October 2024 as part of the World Robot Summit Harsh Environment F-REI Challenge Pre-tournament event. In this challenge, we built a new simulation environment that can safely and repeatedly evaluate tasks under extreme conditions that are difficult to verify in the real world while simultaneously reproducing the complex and harsh environment of debris scattering and poor visibility that can be expected in actual plant disasters. This paper first provides an overview of the history of major disaster response robot simulation competitions that have been held to date. Next, we report on the design of the competition course and the competition results for this pre-tournament event. Furthermore, its applicability to STEM education will also be discussed. Finally, we describe the current status of preparations for the main competition scheduled for October 2025.

論文

Doping-dependent Fe phonon dynamics in LaFeAsO$$_{1-x}$$H$$_x$$ studied by $$^{57}$$Fe nuclear resonant inelastic scattering

河智 史郎*; 平賀 晴弘*; 山浦 淳一*; 飯村 壮史*; 中村 博樹; 筒井 智嗣*; 依田 芳卓*; 町田 昌彦; 細野 秀雄*; 小林 寿夫*

Physical Review B, 113(2), p.024519_1 - 024519_7, 2026/01

https://doi.org/10.1103/7zd9-5t9z
 被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)

LaFeAsO$$_{1-x}$$H$$_x$$ ($$x>0.2$$)の高濃度水素化物イオン置換領域における鉄のフォノンダイナミクスを調べるため、$$^{57}$$Fe核共鳴非弾性散乱測定を、超伝導および反強磁性の基底状態をそれぞれ示す$$x=0.35$$と0.51の2種類の多結晶試料に対して、5$$sim$$300Kの広い温度範囲で実施した。得られた非弾性散乱スペクトルは、両組成間に顕著な差異を示した。Feのフォノン状態密度(PDOS)は、$$x=0.35$$では15meVに顕著なピークを示す一方、$$x=0.51$$ではこのピークが消失している。密度汎関数理論(DFT)計算により、この15meVのPDOSピークはAs原子を介した最近接方向に沿ったFe原子の光学振動モードに関連していることが支持された。さらに計算は、$$x=0.51$$で15meVのPDOSピークが抑制される原因が面内の電子的不等価性に起因することを示唆している。これらの結果は、磁気および構造秩序を示す$$x=0.51$$組成では、広い温度範囲にわたり電子ネマティシティの兆候が持続する可能性がある一方、超伝導を示す$$x=0.35$$組成ではその兆候がほとんど存在しないことを示唆している。

論文

Refined spin Hamiltonian on the Cairo pentagonal lattice of Bi$$_{2}$$Fe$$_{4}$$O$$_{9}$$

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

https://doi.org/10.1103/3n7r-j7wd
 被引用回数：1 パーセンタイル：78.36(Materials Science, Multidisciplinary)

The frustrated magnet Bi$$_{2}$$Fe$$_{4}$$O$$_{9}$$ has been reported to exhibit complex spin dynamics coexisting with conventional spin wave excitations. The magnetic Fe$$^{3+}$$ ($$S = 5/2$$) 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 $$T_N$$, we have reexamined the magnetic excitations across the complete energy scale ($$0 < hbaromega < 90$$ 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.

論文

Subcritical water treatment of spent tannin-based uranium recovery adsorbent

岩本 敏広; 大森 康平; 荒井 陽一; 船越 智雅; 渡部 創; 中村 雅弘; 渡邉 賢*

Proceedings of 32nd International Conference on Nuclear Engineering, Vol.13 (Internet), p.525 - 533, 2026/01

https://doi.org/10.1007/978-981-95-3409-8_44
 被引用回数：0 パーセンタイル：0.00(Energy & Fuels)

In our laboratory in JAEA, Tannics has been used for uranium recovery from nitric acid medium which has been generated from reprocessing technology developments, and the adsorbents loading uranium and nitric acid ions has been accumulating inside the laboratory. Our previous study has shown subcritical water treatment is effective to decompose organic compounds. The technology utilizes dissolution of organic compounds into subcritical water and chemical reactions with chemically activated species, and the technology is promising also for treatment of the spent Tannics. In this study, applicability of the subcritical water treatment for the spent Tannics decomposition was experimentally examined.

論文

Zr-based bulk metallic glass clamp cell for high-pressure inelastic neutron scattering

林田 翔平*; 和田 武*; 石角 元志*; 宗像 孝司*; 飯田 一樹*; 蒲沢 和也*; 梶本 亮一; 稲村 泰弘; 中村 充孝; 岩佐 和晃*; et al.

High Pressure Research; An International Journal, 14 Pages, 2026/00

https://doi.org/10.1080/08957959.2026.2656809
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

We report the fabrication and characterization of a Zr-based bulk metallic glass (Zr-BMG) clamp cell designed for high-pressure inelastic neutron scattering (INS) measurements. The INS spectra of the empty cell exhibit broad and featureless backgrounds, reflecting the amorphous structure of the Zr-BMG. Test measurements using a reference sample, CsFeCl$$_{3}$$, confirm that the neutron transmission of the Zr-BMG cell is significantly higher than that of a conventional monobloc CuBe clamp cell. These results demonstrate that the Zr-BMG clamp cell provides both enhanced neutron transparency and a clean background profile, thereby advancing high-pressure INS studies.

論文

Fukushima Daiichi Nuclear Power Plant Unit 2 Accident analysis considering the thermal stratification and containment leakage

中村 勇気*; 小島 良洋*; 山下 拓哉; 下村 健太; 溝上 伸也

Journal of Nuclear Science and Technology, 62(12), p.1226 - 1230, 2025/12

https://doi.org/10.1080/00223131.2025.2570371
 被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)

In 2011, at the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, it has been reported that several Units of containment vessel had failed, and large quantity of radionuclides had been released into the environment, however, the detail of accident progression with core melt, reactor and containment vessel failure, has still large uncertainties. Especially for the Unit 2 and Unit 3, even they had succeeded in the initial core cooling, at last lost cooling system and fell into severe accident into large release of the fission product into the environment. To clarify these uncertainties in accident scenario, considering the latest information and several insights, the latest accident scenario for Unit 2 and Unit 3 are studied using the severe accident analysis code in this study. It is shown that both Units would result in the thermal stratification in the containment water which encouraged the containment pressure increase at the early phase of the accident. On the other hand, it would be also possible that containment leakage happened to decrease the containment pressure at the later phase of the accident.

論文

Field-induced anomaly in the anisotropic non-Fermi-liquid normal state of UBe$$_{13}$$

清水 悠晴*; 橘高 俊一郎*; 河野 洋平*; 中村 翔太*; 芳賀 芳範; 山本 悦嗣; 町田 一成*; 網塚 浩*; 榊原 俊朗*

Physical Review B, 112(24), p.245157_1 - 245157_10, 2025/12

https://doi.org/10.1103/bxq6-tznr
 被引用回数：1 パーセンタイル：24.47(Materials Science, Multidisciplinary)

We report the results of high-resolution dc magnetization and specific heat measurements on the unconventional superconductor UBe$$_{13}$$.Suppression of the non-Fermi-liquid behavior under field and a nontrivial fifth-order magnetic susceptibility were observed at low temperatures, suggesting the Fermi-surface reconstruction accompanying the crossover from non-Fermi-liquid to Fermi-liquid state in UBe$$_{13}$$.

報告書

JAEA原災法対象施設における四足歩行ロボットの走行機能確認

渡辺 夏帆; 西山 裕; 今橋 正樹; 田口 祐司; 飯塚 由伸; 大内 卓哉; 井上 修一; 小澤 太教; 根本 隆弘; 菅谷 孝; et al.

JAEA-Testing 2025-001, 56 Pages, 2025/11

JAEA-Testing-2025-001.pdf:2.61MB

日本原子力研究開発機構(JAEA)福島廃炉安全工学研究所安全管理部遠隔機材運用課(旧:楢葉遠隔技術開発センター(Naraha Center for Remote Control Technology Development (NARREC))遠隔機材整備運用課)(以下「運用課」という。)所管の原子力緊急事態支援組織は、JAEA各拠点の防災業務計画に定められた遠隔機材を発災時に備え管理している。当該防災業務計画の対象は、原子力科学研究所のJRR-3 (Japan Research Reactor-3)、核燃料サイクル工学研究所の再処理施設、大洗原子力工学研究所の材料試験炉JMTR (Japan Materials Testing Reactor)、高温工学試験研究炉HTTR (High Temperature Engineering Test Reactor)及び高速実験炉常陽、高速増殖原型炉もんじゅ及び新型転換炉原型炉ふげんの7施設である。運用課は、令和3年度に当該7施設の想定発災事象・現場及び走行ルートの調査を行った。その結果、特定の現場において、現有のクローラタイプの走行ロボットの使用よりも操作要員の被ばくを低減できると判断し、令和4年度に四足歩行ロボットSpotを調達した。そして令和5年度に、当該各走行ルートにおいて、映像確認、階段走行等、Spotの機能が問題なく実行できるか、確認を行った。本報告書は、現地において令和5年度に確認試験を実施した6施設(JRR-3、JMTR、HTTR、常陽、もんじゅ及びふげん)について、その走行機能確認の結果を示したものである。

論文

Upgrade of two-dimensional scintillation neutron detectors for single crystal diffractometer SENJU at J-PARC MLF

中村 龍也; 藤 健太郎; 鬼柳 亮嗣; 大原 高志; 細谷 孝明; 戸邊 雅弘; 菱沼 行男*; 海老根 守澄; 坂佐井 馨

Journal of Physics; Conference Series, 3130(1), p.012002_1 - 012002_6, 2025/11

https://doi.org/10.1088/1742-6596/3130/1/012002
 被引用回数：0 パーセンタイル：0.00(Physics, Particles & Fields)

J-PARC物質・生命科学実験施設に設置されたSENJU中性子回折計用の2次元シンチレータ中性子検出器の高度化を進めている。高度化計画には、薄型、高効率型、真空槽下およびバンク設置用の大面積検出器が含まれる。これはすべて$$^{6}$$Li:ZnSと波長シフトファイバーを用いた検出器である。大面積検出器についてはこれまでにオリジナル検出器の2$$times$$2倍の有感面積(512$$times$$512mm)をもつ検出器を開発してきたが、近年ではさらに大面積で長方形の有感面積である検出器を開発している(1$$times$$3倍(256$$times$$768mm)、2$$times$$3倍(512$$times$$768mm))。発表ではこれらの検出器の設計やプロトタイプ検出器の実験結果を報告する。

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