検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年
検索結果: 112 件中 1件目~20件目を表示

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

発表言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

Redifining RADEN's high-resolution neutron imaging capabilities

Sans-Planell, O.*; 篠原 武尚; Grazzi, F.*; Cantini, F.*; Su, Y. H.; 松本 吉弘*; Parker, J. D.*; Manke, I.*

Review of Scientific Instruments, 95(11), p.113702_1 - 113702_5, 2024/11

 被引用回数:0 パーセンタイル:0.00(Instruments & Instrumentation)

This study presents a significant development in the Energy-Resolved Neutron Imaging System RADEN, in the Japan Proton Accelerator Research Complex, Japan. Through a systematic study, the collimation power of the facility was reevaluated. To perform the calculation of the L/D factor of the beam, a state-of-the-art method has been used, along with a standard reference sample to measure the resolution of neutron images. To add robustness to the results, the study compares five different scintillators of different composition and thickness.

論文

Energy-resolved neutron imaging study of a Japanese sword signed by Bishu Osafune Norimitsu

及川 健一; 松本 吉弘*; 渡辺 賢一*; 佐藤 博隆*; Parker, J. D.*; 篠原 武尚; 鬼柳 善明*

Scientific Reports (Internet), 14, p.27990_1 - 27990_11, 2024/11

 被引用回数:0 パーセンタイル:0.00(Multidisciplinary Sciences)

We are conducting research focused on elucidating the crystallographic structure of Japanese swords in a non-destructive manner using the neutron imaging instrument RADEN at J-PARC. In this study, we developed an analysis method that combines wavelength-resolved Bragg-edge imaging and a wavelength-selective neutron tomography with a new strategy, and applied it to an approximately 45 cm long Japanese sword signed by Bishu Osafune Norimitsu. Computed tomography was performed, and the analysis succeeded in clearly capturing the characteristic internal structure "Kobuse". Kobuse is most famous steel combining structure of Japanese swords, where a center steel with low carbon content is covered by an outer steel with high carbon content. The crystallite size distribution obtained through Bragg-edge analysis was able to explain without contradiction from the layered structure of two steels observed in neutron tomograms. Our non-destructive imaging also revealed that the quenching was quite deep, forming a wavy pattern more than 5 mm away from the cutting edge.

論文

Nondestructive analysis of internal crystallographic structures of Japanese swords using neutron imaging

松本 吉弘*; 及川 健一; 渡辺 賢一*; 佐藤 博隆*; Parker, J. D.*; 篠原 武尚; 鬼柳 善明*

Journal of Archaeological Science; Reports, 58, p.104729_1 - 104729_10, 2024/10

We investigated the internal crystallographic structures of Japanese swords using a nondestructive analysis method that combines neutron Bragg-edge transmission (BET) imaging and neutron tomography. BET provides insights into the crystalline structure of the steel, while the neutron tomography offers cross-sectional views of the sword. To systematically explore and understand the technical and historical transition of Japanese sword-making methods, it is important to analyze the internal crystalline structure of various swords, taking into account factors such as production period, region, and swordsmith. Our study examined three swords: Kashu Kiyomitsu, Nankaitaro Tomotaka, and Hosokawa Masanori. The results reveal distinct differences in the internal structures of these swords. This innovative nondestructive approach allowed us to gain detailed insights into the microstructures of these historical artifacts without causing any damage.

論文

Comparison between carrier transport property and crystal quality of TlBr semiconductors

渡辺 賢一*; 須貝 優介*; 長谷川 創大*; 田中 清志朗*; 人見 啓太朗*; 野上 光博*; 篠原 武尚; Su, Y. H.; Parker, J. D.*; Kockelmann, W.*

Scientific Reports (Internet), 14, p.25224_1 - 25224_13, 2024/10

 被引用回数:0 パーセンタイル:0.00(Multidisciplinary Sciences)

Thallium bromide (TlBr) semiconductor detectors are being developed as promising candidates for high-detection-efficiency, high-energy-resolution, and room-temperature gamma-ray spectrometers. This study presents methods for evaluating TlBr crystal quality and carrier transport characteristics using neutron Bragg-dip imaging and the time-of-flight method for pulsed-laser-induced carriers, respectively. In this study, two samples obtained from both the upstream and downstream region in the crystal ingot were evaluated.

論文

Phase and contrast moir$'e$ signatures in two-dimensional cone beam interferometry

Sarenac, D.*; Gorbet, G.*; Clark, C. W.*; Cory, D. G.*; Ekinci, H.*; Henderson, M. E.*; Huber, M. G.*; Hussey, D. S.*; Kapahi, C.*; Kienzle, P. A.*; et al.

Physical Review Research (Internet), 6(3), p.L032054_1 - L032054_8, 2024/09

Neutron interferometry has played a distinctive role in fundamental science and characterization of materials. Moir$'e$ neutron interferometers are candidate next-generation instruments: they offer microscopy-like magnification of the signal, enabling direct camera recording of interference patterns across the full neutron wavelength spectrum. Here we demonstrate the extension of phase-grating moir$'e$ interferometry to two-dimensional geometries. Our measurements of phase topologies and gravitationally induced phase shifts are in good agreement with theory.

論文

Gradient residual strain determination of surface impacted railway S38C axles by neutron Bragg-edge transmission imaging

Hu, F. F.*; Qin, T. Y.*; Ao, N.*; Su, Y. H.; Zhou, L.*; 徐 平光; Parker, J. D.*; 篠原 武尚; Chen, J.*; Wu, S. C.*

Engineering Fracture Mechanics, 306, p.110267_1 - 110267_18, 2024/08

 被引用回数:2 パーセンタイル:51.41(Mechanics)

Non-destructive and quantitative mapping of gradient residual strain distribution in surface-hardened railway S38C axles could provide a positive reference for determining service lifetime and maintenance strategy. To tackle this concern, time-of-flight neutron Bragg-edge transmission imaging was employed by real axle samples with and without impacted crater. A novel and simple procedure to formulate the residual strain field was also developed in this work, with the transmission batch code in Appendix A. By mapping the global two- dimensional residual strains, it can be verified that the residual strains into the axle are uniformly distributed in the hoop direction. Subsequently, it was revealed that the axial and hoop residual strains, respectively in the cylinder and the long strip samples prepared from a real S38C hollow axle, indicated a gradient evolution distribution with a depth of $$sim$$ 8 mm, covering a range of -5500 $$sim$$ 1000 $$mu$$$$varepsilon$$ for axial strains and -6500 $$sim$$ 1000 $$mu$$$$varepsilon$$ for hoop strains. More importantly, the maximum compressive lattice strain of the cylinder sample was increased by 15.61%, and 22.35% at the impacting speeds of 100, and 125 m/s, respectively; and that of the long strip sample increased by 29.17%, and 43.70%, respectively. It can thus be concluded that lattice strains have redistributed around the impact crater, demonstrating the local alteration of the residual strain field. These new findings suggest the localized variation in residual strains should be taken into account while evaluating the service damage evolution of railway axles, especially those affected by high-speed impacts during operation.

論文

Cone beam neutron interferometry; From modeling to applications

Sarenac, D.*; Gorbet, G.*; Kapahi, C.*; Clark, C. W.*; Cory, D. G.*; Ekinci, H.*; Garrad, D. V.*; Henderson, M. E.*; Huber, M. G.*; Hussey, D.*; et al.

Physical Review Research (Internet), 6(2), p.023260_1 - 023260_15, 2024/06

Phase-grating moire interferometers (PGMIs) have emerged as promising candidates for the next generation of neutron interferometry, enabling the use of a polychromatic beam and manifesting interference patterns that can be directly imaged by existing neutron cameras. However, the modeling of the various PGMI configurations is limited to cumbersome numerical calculations and backward propagation models which often do not enable one to explore the setup parameters. Here we generalize the Fresnel scaling theorem to introduce a k-space model for PGMI setups illuminated by a cone beam, thus enabling an intuitive forward propagation model for a wide range of parameters and experimental setups.

論文

Spin dependence in the $$p$$-wave resonance of $$^{139}$$$overrightarrow{textrm{La}}$+$overrightarrow{n}$

奥平 琢也*; 中部 倫太郎*; Auton, C. J.*; 遠藤 駿典; 藤岡 宏之*; Gudkov, V.*; 井出 郁央*; 猪野 隆*; 石角 元志*; 神原 理*; et al.

Physical Review C, 109(4), p.044606_1 - 044606_9, 2024/04

 被引用回数:0 パーセンタイル:0.00(Physics, Nuclear)

We measured the spin dependence in a neutron-induced p-wave resonance by using a polarized epithermal neutron beam and a polarized nuclear target. Our study focuses on the 0.75 eV $$p$$-wave resonance state of $$^{139}$$La+n, where largely enhanced parity violation has been observed. We determined the partial neutron width of the $$p$$-wave resonance by measuring the spin dependence of the neutron absorption cross section between polarized $$^{139}$$La and polarized neutrons. Our findings serve as a foundation for the quantitative study of the enhancement effect of the discrete symmetry violations caused by mixing between partial amplitudes in the compound nuclei.

論文

High sensitivity of a future search for effects of $$P$$-odd/$$T$$-odd interactions on the 0.75 eV $$p$$-wave resonance in $$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$ forward transmission determined using a pulsed neutron beam

中部 倫太郎*; Auton, C. J.*; 遠藤 駿典; 藤岡 宏之*; Gudkov, V.*; 広田 克也*; 井出 郁央*; 猪野 隆*; 石角 元志*; 神原 理*; et al.

Physical Review C, 109(4), p.L041602_1 - L041602_4, 2024/04

 被引用回数:0 パーセンタイル:0.00(Physics, Nuclear)

Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same enhancement mechanism observed for large parity violating (PV) effects in neutron-induced compound nuclear processes. In these compound processes, the TRIV cross-section is given as the product of the PV cross-section, a spin-factor $$kappa$$, and a ratio of TRIV and PV matrix elements. We determined $$kappa$$ to be 0.59 $$pm$$ 0.05 for $$^{139}$$La+n using both (n, $$gamma$$) spectroscopy and ($$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$) transmission. This result quantifies for the first time the high sensitivity of the $$^{139}$$La 0.75 eV $$p$$-wave resonance in a future search for $$P$$-odd/$$T$$-odd interactions in ($$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$) forward transmission.

論文

Comparison between neutron bragg dip and electron backscatter diffraction images of TlBr semiconductors

渡辺 賢一*; 須貝 優介*; 長谷川 創大*; 人見 啓太朗*; 野上 光博*; 篠原 武尚; Su, Y. H.; Parker, J. D.*; Kockelmann, W.*

Sensors and Materials, 36(1), p.149 - 154, 2024/01

 被引用回数:2 パーセンタイル:76.72(Instruments & Instrumentation)

Thallium bromide (TlBr) semiconductor detectors are promising candidates for high-detection-efficiency, high-energy-resolution, and room-temperature gamma-ray spectrometers. In this study, we conducted neutron Bragg dip and electron backscatter diffraction (EBSD) imaging of TlBr crystals to measure the crystal orientation distribution. We confirmed that crystal grains were continuous over a certain distance along the solidification direction for samples fabricated with the current growth procedure.

論文

Development of an areal density imaging for boron and other elements

土川 雄介; 甲斐 哲也; 阿部 雄太; 及川 健一; Parker, J. D.*; 篠原 武尚; 佐藤 一憲

Journal of Physics; Conference Series, 2605, p.012022_1 - 012022_6, 2023/10

中性子断面積の大きいホウ素の面密度分布を、エネルギー分析型中性子イメージングにより取得する方法を開発した。一般に、中性子感度が非常に高い元素の測定では、元素量が多くなると中性子の自己遮蔽効果が無視できず、定量的な測定が困難になる。この効果を回避するために、既知の断面積データを用いたエネルギースペクトル解析を試み、J-PARCの物質・生命科学実験施設において、定量的な二次元イメージング像の取得を実証した。本発表では、一例として福島第一原子力発電所のシビアアクシデントの研究において得られた模擬溶融試験体デブリの測定結果を紹介する。この取り組みは、溶融過程における制御棒からのホウ素の挙動を調査するものである。ホウ素の中性子断面積は、広い範囲で中性子エネルギーの平方根に反比例し、模擬燃料集合体に含まれる他の物質とは大きく異なる。試料の中性子透過率を中性子イメージング検出器で測定し、二次元的なホウ素の面密度分布を得た。同様に、鉄やジルコニウム等比較的感度の低い他元素の面密度分布も導出することを試みた。

論文

Neutron resonance absorption imaging of simulated high-level radioactive waste in borosilicate glass

大場 洋次郎; 元川 竜平; 金子 耕士; 永井 崇之; 土川 雄介; 篠原 武尚; Parker, J. D.*; 岡本 芳浩

Scientific Reports (Internet), 13, p.10071_1 - 10071_8, 2023/06

 被引用回数:2 パーセンタイル:51.90(Multidisciplinary Sciences)

The spatial distribution of constituent elements in borosilicate glasses containing simulated high-level radioactive liquid waste (HLLW) was investigated using neutron resonance absorption imaging. The resonance absorption dips of Rh, Pd, Na, Gd, Cs, and Sm were detected in the neutron transmission spectra of the glass samples. The neutron transmission images at the resonance energies of these elements provided the spatial distributions within the glass samples. Rh and Pd led sedimentation, while Gd, Sm, and Cs were uniformly dispersed. These results clearly show the potential of neutron resonance absorption imaging for characterizing borosilicate glasses.

論文

Spatial distribution and preferred orientation of crystalline microstructure of lead-bismuth eutectic

伊藤 大介*; 佐藤 博隆*; 大平 直也*; 齊藤 泰司*; Parker, J. D.*; 篠原 武尚; 甲斐 哲也; 及川 健一

Journal of Nuclear Materials, 569, p.153921_1 - 153921_6, 2022/10

 被引用回数:3 パーセンタイル:45.58(Materials Science, Multidisciplinary)

To develop a lead-bismuth eutectic (LBE) cooled nuclear reactor, phase transition phenomena of LBE are very important. In the solidification of LBE, the crystalline structure is varied with the cooling process. The volumetric expansion of LBE must be clarified for the safety of an LBE cooled nuclear reactor. The time dependence of the volumetric expansion depends on the crystalline microstructure. In this study, the crystalline microstructure of the LBE samples solidified with the different cooling processes was investigated by the neutron Bragg edge imaging technique. Spatially integrated and local microstructure characteristics of LBE samples were analyzed. Characteristics of preferred orientation of LBE microstructure were clarified.

論文

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.

論文

Feasibility study of PGAA for boride identification in simulated melted core materials

土川 雄介; 阿部 雄太; 大石 佑治*; 甲斐 哲也; 藤 暢輔; 瀬川 麻里子; 前田 亮; 木村 敦; 中村 詔司; 原田 正英; et al.

JPS Conference Proceedings (Internet), 33, p.011074_1 - 011074_6, 2021/03

福島原子力発電所の解体作業では、溶融した燃料棒に含まれるホウ素分布を事前に把握することが重要である。溶融燃料棒の模擬試験体を用意し、ホウ素やホウ化物の含有量を調査する研究が行われてきた。本研究では、その一環として中性子を用いたホウ素並びにホウ化物分布の測定技術開発を行った。ホウ素の中性子吸収に伴う即発ガンマ線を測定し、ホウ素量や二次元分布を測定した。また、n(B,$$alpha$$$$gamma$$)反応における478keV$$gamma$$線は、ホウ素の化合状態により、$$gamma$$線ピークの幅が変化することが知られている。このことを用い、特に溶融燃料棒周辺に存在することが予測されているZrBやFeBといったホウ化物の識別可能性について調査した。測定はJ-PARC/MLFのANNRI, NOBORU, RADENにて行った。これらの解析結果について報告する。

論文

Observation of Eu adsorption band in the CMPO/SiO$$_{2}$$-P column by neutron resonance absorption imaging

宮崎 康典; 渡部 創; 中村 雅弘; 柴田 淳広; 野村 和則; 甲斐 哲也; Parker, J. D.*

JPS Conference Proceedings (Internet), 33, p.011073_1 - 011073_7, 2021/03

中性子共鳴吸収イメージングを、抽出クロマトグラフィに使用するマイナーアクチノイド回収用CMPO/SiO$$_{2}$$-Pカラムで形成したEu吸着バンドの観測に適用した。軽水や重水で調製した湿潤カラムと乾燥吸着材を充填した乾燥カラムを比較し、中性子透過を評価した。中性子透過スペクトルから、乾燥カラムは45%、軽水調製カラムは20%、重水調製カラムは40%の中性子透過を確認した。得られた結果から、CMPO/SiO$$_{2}$$-Pカラムに形成したEu吸着バンドを観測するには、重水の使用によって、より鮮明になることを明らかにした。今後、カラム操作による吸着バンドのカラム内移行挙動を明らかにする。

論文

Pulsed neutron imaging for differentiation of ice and liquid water towards fuel cell vehicle applications

樋口 雄紀*; 瀬戸山 大吾*; 伊勢川 和久; 土川 雄介; 松本 吉弘*; Parker, J. D.*; 篠原 武尚; 長井 康貴*

Physical Chemistry Chemical Physics, 23(2), p.1062 - 1071, 2021/01

 被引用回数:11 パーセンタイル:63.65(Chemistry, Physical)

本研究は、パルス中性子源施設において行われた水と氷のイメージングに関する最初の報告である。固体高分子燃料電池(PEFC)内部の水分分布を可視化するために中性子イメージングを利用した。特に、エネルギー分解中性子イメージングは、液体の水と氷を区別することができる手法であり、氷点下の環境で動作するPEFCにおける氷の形成を調べるのに効果的である。水氷識別は、低中性子エネルギーにおいて液体の水と氷の断面積が異なることを利用した。実際のPEFC内の混相流(気体・液体・固体)の過渡的な凍結・融解現象を高い空間分解能で定量的に観測するためには、高強度で広いエネルギー範囲を持つパルス中性子ビームが最適である。本研究では、PEFCの流路を模擬して細い毛細管に封入した水を用い、パルス中性子ビームを照射して氷、液体水、過冷却水を識別し、毛細管内の水の凍結・融解現象を明らかにした。さらに、実物大の燃料電池を用いたその場観察へのステップとして、-30$$^{circ}$$Cまで冷却可能なサブゼロ環境チャンバーを製作し、大視野(300mm$$times$$300mm)での液体の水・氷分布の観察を可能にした。

論文

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.

論文

Development of event-type neutron imaging detectors at the energy-resolved neutron imaging system RADEN at J-PARC

Parker, J. D.*; 原田 正英; 林田 洋寿*; 廣井 孝介; 甲斐 哲也; 松本 吉弘*; 中谷 健; 及川 健一; 瀬川 麻里子; 篠原 武尚; et al.

Materials Research Proceedings, Vol.15, p.102 - 107, 2020/05

At the RADEN instrument, we take advantage of the accurate measurement of neutron energy by time-of-flight to perform energy-resolved neutron imaging using event-type neutron imaging detectors. We are continually working to improve these detectors for better spatial resolution and shorter measurement times and, as a user facility, to improve the ease-of-use of their control and analysis software. In particular, we are actively developing a $$^{3}$$He-based gaseous micropattern detector known as the Micro-pixel chamber based Neutron Imaging Detector ($$mu$$ NID). We have recently redesigned the $$mu$$ NID control software to allow full integration into the automated experiment control system at RADEN, and we are carrying out optimization of the analysis algorithms for improved image quality and rate performance.

論文

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

AA2019-0737.pdf:18.65MB

 被引用回数:73 パーセンタイル:97.05(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.

112 件中 1件目~20件目を表示