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Current status of decommissioning and waste management at the Ningyo-Toge Environmental Engineering Center

大橋 裕介; 島池 政満; 松本 孝志; 高橋 信雄; 横山 薫; 森本 靖之

Nuclear Technology, 10 Pages, 2023/00

 被引用回数:0 パーセンタイル:0.05(Nuclear Science & Technology)




山根 いくみ; 高橋 信雄; 澤山 兼吾; 西脇 大貴; 松本 孝志; 小川 潤平; 野村 光生; 有馬 立身*

JAEA-Technology 2021-038, 18 Pages, 2022/02


人形峠環境技術センターの設備解体撤去による解体物の発生予想量は全体で約13万トンである。そのうち放射性廃棄物でない廃棄物(以下NR: Nonradioactive wasteという)となる非放射性廃棄物は約80%である。しかしながら、このNR対象となる鋼材の一部には汚染された可能性を否定できないものがあり、これらについては汚染が疑われる部分の表面塗装膜を分離・除去させた後、搬出のためのサーベイを実施してからNRとしている。現在の分離・除去方法ではグラインダー等の回転研磨工具による手作業を採用しているが、この方法は粉塵の飛散と吸入防止のためのグリーンハウスの設置や作業員のタイベックスーツと全面マスクの着用を必要とする。このため、分離・除去方法のさらなる改良による作業の短時間化(低コスト化)、作業員への負荷低減、そして、過剰な研磨による二次廃棄物発生の抑制が望まれている。そこで本研究では、工事現場等で塗装膜分離・除去に使用されるレーザークリーニング技術に着目した。NR対象物の塗装膜分離・除去技術の向上を目的とし、レーザークリーニング装置を用いたNR鋼材表面塗装膜の分離・除去性能評価、高速度カメラによる塗装膜飛散挙動の観測と塗装膜回収方法の検討、鋼材表面の粉体に対するレーザー分離・除去性能評価、鋼材表面上のウラン化合物の熱力学的評価を行った。またこれらに基づいて、今後のレーザークリーニング技術の導入による実作業への適合性についても検討して今後の展開について整理した。


Quantum proton entanglement on a nanocrystalline silicon surface

松本 貴裕*; 杉本 秀彦*; 大原 高志; 徳光 昭夫*; 冨田 誠*; 池田 進*

Physical Review B, 103(24), p.245401_1 - 245401_9, 2021/06

 被引用回数:0 パーセンタイル:0(Materials Science, Multidisciplinary)

We investigate the quantum entangled state of two protons terminating on a silicon surface. The entangled states were detected using the surface vibrational dynamics of nanocrystalline silicon with inelastic neutron scattering spectroscopy. The protons are identical, therefore the harmonic oscillator parity constrains the spin degrees of freedom, forming strongly entangled states for all the energy levels of surface vibrations. Compared to the proton entanglement previously observed in hydrogen molecules, this entanglement is characterized by an enormous energy difference of 113 meV between the spin singlet ground state and the spin triplet excited state. We theoretically demonstrate the cascade transition of terahertz entangled photon pairs utilizing proton entanglement.


Determination of localized surface phonons in nanocrystalline silicon by inelastic neutron scattering spectroscopy and its application to deuterium isotope enrichment

松本 貴裕*; 野又 郁実*; 大原 高志; 金光 義彦*

Physical Review Materials (Internet), 5(6), p.066003_1 - 066003_9, 2021/06

 被引用回数:0 パーセンタイル:0(Materials Science, Multidisciplinary)

The hydrogen isotope deuterium has attracted special interest for the manufacture of silicon (Si) semiconductors as well as for the synthesis of isotopically labeled compounds. However, the efficient production of D or H deuteride in a controlled manner is challenging, and rational H isotope enrichment protocols are still lacking. Here, we demonstrate a highly efficient exchange reaction from H to D on the surface of nanocrystalline Si. Fourfold enrichment of D termination was successfully achieved by dipping n-Si into a dilute D solution. By determining the surface-localized vibrational modes for H-and D-terminated n-Si using inelastic neutron scattering spectroscopy, we found that the physical mechanism responsible for this enrichment originates from the difference in the zero-point oscillation energies and entropies of the surface-localized vibrations.


High-temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator

鈴木 慎太郎*; 田久保 耕*; 久我 健太郎*; 髭本 亘; 伊藤 孝; 冨田 崇弘*; 志村 恭通*; 松本 洋介*; Bareille, C.*; 和達 大樹*; et al.

Physical Review Research (Internet), 3(2), p.023140_1 - 023140_12, 2021/05



Visualization of the boron distribution in core material melting and relocation specimen by neutron energy resolving method

阿部 雄太; 土川 雄介; 甲斐 哲也; 松本 吉弘*; Parker, J. D.*; 篠原 武尚; 大石 佑治*; 加美山 隆*; 永江 勇二; 佐藤 一憲

JPS Conference Proceedings (Internet), 33, p.011075_1 - 011075_6, 2021/03

Since the hardness of fuel debris containing boride from B$$_{4}$$C pellet in control rod is estimated to be two times higher as that of oxide, such as UO$$_{2}$$ and ZrO$$_{2}$$, distribution of such boride in the fuel debris formed in the Fukushima-Daiichi Nuclear Power Plants may affect the process of debris cutting and removal. The high neutron absorption of boron may affect the possibility of re-criticality during the process of debris removal. Therefore, boride distribution in fuel debris is regarded as an important issue to be addressed. However, boron tends to have difficult in quantification with conventionally applied methods like EPMA and XPS. In this study, accelerator-driven neutron-imaging system was applied. Since boron is the material for neutron absorption, its sensitivity in terms of neutron penetration through specimens is concerned. To adjust neutron attenuation of a specimen to suit a particular measurement by selecting the neutron energy range, we focused on the energy resolved neutron imaging system RADEN, which utilizes wide energy range from meV to keV. Development of a method to visualize boron distribution using energy-resolved neutrons has been started. In this presentation the authors show the status of the development of a method utilizing energy-resolved neutrons and provide some outcome from its application to the Core Material Melting and Relocation (CMMR)-0 and -2 specimens.


Development of three-dimensional distribution visualization technology for boron using energy resolved neutron-imaging system (RADEN)

阿部 雄太; 土川 雄介; 甲斐 哲也; 松本 吉弘*; Parker, J. D.*; 篠原 武尚; 大石 佑治*; 加美山 隆*; 永江 勇二; 佐藤 一憲

Proceedings of 2020 International Conference on Nuclear Engineering (ICONE 2020) (Internet), 6 Pages, 2020/08

Boron carbide is used as a neutron-absorbing material in Fukushima-Daiichi Nuclear Power Station (1F), producing borides that are twice as hard as oxides (such as UO$$_{2}$$ and ZrO$$_{2}$$). The high neutron absorption of boron affects the evaluation of re-criticality during the process of debris retrieval. Therefore, it is important not only to determine the presence of boron but also to investigate the distribution of boron inside the material in a non-destructive manner during decommissioning. To address the uncertainties in the core material relocation behavior of boiling water reactor (BWR) during a severe accident (SA), solidified melt specimens of a simulated fuel assembly were prepared by plasma heating. If core material melting and relocation (CMMR) specimens can be used to estimate the B distribution in 1F Unit-3, that will provide valuable information in the decommissioning of 1F. To address this, the authors focused on the energy-resolved neutron imaging system, RADEN, which utilizes a wide energy range, from meV to keV. This is an innovative three-dimensional analysis technology for boride distribution that affects the evaluation of hardness and re-criticality. In the calibration standard samples (Zr$$_{x}$$B$$_{1-x}$$ and Fe$$_{x}$$B$$_{1-x}$$), there was a good correlation between boron concentration and the energy-dependence of the cross sections of cold and epi-thermal neutrons. In the CMMR specimens, boron distribution was confirmed from the contrast difference between cold and epi-thermal neutrons. In the future, the results of calibration standard samples will be applied to the results of CMMR specimens. With this method, three-dimensional boron distribution will be measured, and the understanding of boride distribution 1F Unit-3 will be improved, which may be reflected in an improved SA code.


The Energy-resolved neutron imaging system, RADEN

篠原 武尚; 甲斐 哲也; 及川 健一; 中谷 健; 瀬川 麻里子; 廣井 孝介; Su, Y. H.; 大井 元貴; 原田 正英; 飯倉 寛; et al.

Review of Scientific Instruments, 91(4), p.043302_1 - 043302_20, 2020/04

 被引用回数:34 パーセンタイル:95.9(Instruments & Instrumentation)

The energy-resolved neutron imaging system, RADEN, has been installed at the pulsed neutron source in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. In addition to conventional neutron radiography and tomography, RADEN, the world's first imaging beam-line at a pulsed neutron source, provides three main options for new, quantitative neutron imaging techniques: Bragg-edge imaging to visualize the spatial distribution of crystallographic information, resonance absorption imaging for elemental composition and temperature information, and polarized neutron imaging for magnetic field information. This paper describes the results of characterization studies of the neutronic performance and installed devices at RADEN and shows the results of several demonstration studies for pulsed neutron imaging.


Structural characterization and magnetic behavior of uranium compound U$$_2$$Pt$$_6$$Al$$_{15}$$

芳賀 芳範; 菅井 孝志*; 松本 裕司*; 山本 悦嗣

JPS Conference Proceedings (Internet), 29, p.013003_1 - 013003_5, 2020/02

Crystal structure and magnetic property of U$$_2$$Pt$$_6$$Al$$_{15}$$ is investigated. A single crystal X-ray diffraction experiment identified the hexagonal unit cell with a disordered structure in the uranium containing layer. A series of superstructure reflections were found. They are successfully indexed as ($$h$$/3 $$k$$/3 0), however, with a streak along the $$l$$ direction. A layered structure model containing honeycomb arrangement of uranium atoms is proposed. Preliminary magnetization measurements on a polycrystalline sample are also presented.


Quantum twin spectra in nanocrystalline silicon

松本 貴裕*; 大原 高志; 杉本 秀彦*; Bennington, S. M.*; 池田 進*

Physical Review Materials (Internet), 1(5), p.051601_1 - 051601_6, 2017/10

 被引用回数:2 パーセンタイル:8.72(Materials Science, Multidisciplinary)

We identified twin split scattering spectra in hydrogen-terminated nanocrystalline silicon by using inelastic neutron scattering spectroscopy. A standard theoretical analysis based on the localized wave function of hydrogen in not sufficient to explain this duality. We show that this duality originates from the cooperative motion of hydrogen and silicon.


Experimental analysis of neutron and background $$gamma$$-ray energy spectra of 80-400 MeV $$^{7}$$Li(p,n) reactions under the quasi-monoenergetic neutron field at RCNP, Osaka University

岩元 洋介; 佐藤 達彦; 佐藤 大樹; 萩原 雅之*; 八島 浩*; 増田 明彦*; 松本 哲郎*; 岩瀬 広*; 嶋 達志*; 中村 尚司*

EPJ Web of Conferences, 153, p.08019_1 - 08019_3, 2017/09

 被引用回数:0 パーセンタイル:0.03



Characterization of the PTW 34031 ionization chamber (PMI) at RCNP with high energy neutrons ranging from 100 - 392 MeV

Theis, C.*; Carbonez, P.*; Feldbaumer, E.*; Forkel-Wirth, D.*; Jaegerhofer, L.*; Pangallo, M.*; Perrin, D.*; Urscheler, C.*; Roesler, S.*; Vincke, H.*; et al.

EPJ Web of Conferences, 153, p.08018_1 - 08018_5, 2017/09

 被引用回数:0 パーセンタイル:0.03



Shielding experiments of concrete and iron for the 244 MeV and 387 MeV quasi-mono energetic neutrons using a Bonner sphere spectrometer (at RCNP, Osaka Univ.)

松本 哲郎*; 増田 明彦*; 西山 潤*; 岩瀬 広*; 岩元 洋介; 佐藤 大樹; 萩原 雅之*; 八島 浩*; 八島 浩*; 嶋 達志*; et al.

EPJ Web of Conferences, 153, p.08016_1 - 08016_3, 2017/09

 被引用回数:0 パーセンタイル:0.03



Neutron spectrometry and dosimetry in 100 and 300 MeV quasi-mono-energetic neutron field at RCNP, Osaka University, Japan

Mares, V.*; Trinkl, S.*; 岩元 洋介; 増田 明彦*; 松本 哲郎*; 萩原 雅之*; 佐藤 大樹; 八島 浩*; 嶋 達志*; 中村 尚司*

EPJ Web of Conferences, 153, p.08020_1 - 08020_3, 2017/09

 被引用回数:5 パーセンタイル:94.83



Non-aqueous selective synthesis of orthosilicic acid and its oligomers

五十嵐 正安*; 松本 朋浩*; 八木橋 不二夫*; 山下 浩*; 大原 高志; 花島 隆泰*; 中尾 朗子*; 茂吉 武人*; 佐藤 一彦*; 島田 茂*

Nature Communications (Internet), 8, p.140_1 - 140_8, 2017/07

 被引用回数:23 パーセンタイル:63.82(Multidisciplinary Sciences)

Orthosilicic acid (Si(OH)$$_{4}$$) and its small condensation compounds are among the most important silicon compounds but have never been isolated, despite the long history of intense research due to their instability. These compounds would be highly useful building blocks for advanced materials if they become available at high purity. We developed a simple procedure to selectively synthesize orthosilicic acid, its dimer, cyclic trimer, and tetramer, as well as appropriate conditions to stabilize these species, in organic solvents. Isolation of orthosilicic acid, the dimer and the cyclic tetramer as hydrogen-bonded crystals with tetrabutylammonium halides and of the cyclic trimer as solvent-containing crystals was achieved. The solid-state structures of these compounds were unambiguously clarified by single crystal X-ray diffraction analysis and also by neutron diffraction study for orthosilicic acid. Based on these results, we also succeeded in developing a more practical synthetic procedure for high concentrations of stable orthosilicic acid stably in organic solvents via a simple hydrolysis of tetraalkoxysilanes.


Applicability of the two-angle differential method to response measurement of neutron-sensitive devices at the RCNP high-energy neutron facility

増田 明彦*; 松本 哲郎*; 岩元 洋介; 萩原 雅之*; 佐藤 大樹; 佐藤 達彦; 岩瀬 広*; 八島 浩*; 中根 佳弘; 西山 潤*; et al.

Nuclear Instruments and Methods in Physics Research A, 849, p.94 - 101, 2017/03

 被引用回数:0 パーセンタイル:0.02(Instruments & Instrumentation)



濃縮工学施設における廃止措置の進捗状況; 平成26年度下半期

松本 孝志; 高橋 信雄; 林原 健一; 石森 有; 美田 豊; 垣屋 秀好

JAEA-Technology 2016-020, 80 Pages, 2016/11




濃縮工学施設における廃止措置の進捗状況; 平成26年度上半期

松本 孝志; 森本 靖之; 高橋 信雄; 高田 正晴; 吉田 英明; 中島 伸一; 石森 有

JAEA-Technology 2015-036, 60 Pages, 2016/01




Characterization of high-energy quasi-monoenergetic neutron energy spectra and ambient dose equivalents of 80-389 MeV $$^{7}$$Li(p,n) reactions using a time-of-flight method

岩元 洋介; 萩原 雅之*; 佐藤 大樹; 荒木 祥平*; 八島 浩*; 佐藤 達彦; 増田 明彦*; 松本 哲郎*; 中尾 徳晶*; 嶋 達志*; et al.

Nuclear Instruments and Methods in Physics Research A, 804, p.50 - 58, 2015/12

 被引用回数:22 パーセンタイル:89.35(Instruments & Instrumentation)

大阪大学核物理研究センター(RCNP)において、80, 100及び296MeVの陽子に対する準単色中性子のエネルギースペクトルを飛行時間法により測定した。中性子スペクトルは準単色中性子ピーク部と連続部からなり、ピーク収量は陽子エネルギー80$$sim$$389MeVにおいて、0.9$$sim$$1.1$$times$$10$$^{10}$$(個/sr/$$mu$$C)の範囲であり、全体の収量に対するピーク収量の比は、0.38$$sim$$0.48であった。この準単色中性子場を用いて、ビーム軸上(0度)に設置した中性子モニターのピーク部に対する周辺線量当量(応答)を測定するため、全体の応答から、0度と25度のスペクトルの連続部の応答が等しくなる定数kを決定し、この定数で規格化された25度に設置した連続部からなる中性子モニターの応答を差し引く手法を提案した。定数kは、陽子エネルギー80$$sim$$389MeVの範囲において、0.74$$sim$$1.02であった。以上により、これまでの実験の成果と合わせて、RCNPで80$$sim$$389MeVの陽子を$$^{7}$$Liターゲットに入射させて生成する準単色中性子場の特性を示すデータを得ることができた。


Characterization of quasi-monoenergetic neutron source using 137, 200, 246 and 389 MeV $$^{7}$$Li(p,n) reactions

岩元 洋介; 萩原 雅之*; 岩瀬 広*; 八島 浩*; 佐藤 大樹; 松本 哲郎*; 増田 明彦*; Pioch, C.*; Mares, V.*; 嶋 達志*; et al.

Progress in Nuclear Science and Technology (Internet), 4, p.657 - 660, 2014/04

100MeVを超える高エネルギー準単色中性子照射場を開発するために、大阪大学核物理研究センター(RCNP)において、137, 200, 246, 389MeVの$$^{7}$$Li(p,n)反応から生成する、0$$^{circ}$$から30$$^{circ}$$の間の7角度における中性子エネルギースペクトルを、有機液体シンチレータNE213と飛行時間法を用いて測定した。0$$^{circ}$$における中性子エネルギースペクトルは、単色成分と連続成分からなり、全体成分に対する単色成分の比率は0.4$$sim$$0.5であった。また、角度が大きくなるにつれて、連続成分のスペクトル形状が大きく変化することがわかった。さらに、この照射場を利用し、放射線モニタの校正を行うにあたっては、連続成分の寄与を小さくするために、0$$^{circ}$$と約22$$^{circ}$$に放射線モニタを設置し、その応答の差をとる手法が最も良いことがわかった。

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