研究者詳細 - 清水　裕彦

論文 - 清水　裕彦

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J-PARC/BL05における中性子寿命測定実験：背景事象低減のための中性子入射コリメーターの導入と物理ランの現状 Open Access

市川豪, 不破康裕, 長谷川拓郎, 広田克也, 細川律也, 猪野隆, 岩下芳久, 北口雅暁, 古賀淳, 松崎俊, 三島賢二, 茂木駿紀, 森川滉己, 音野瑛俊, 關義親, 関場大一郎, 嶋達志, 清水春樹, 清水裕彦, 角直幸, 角野浩史, 山下了, 矢野浩大, 吉岡瑞樹

日本物理学会講演概要集 77.1 巻 ( 0 ) 頁： 139 - 139 2022年

冷中性子の無損失輸送に向けた磁場勾配ミラーによる中性子反射測定 Open Access

河村しほり, 藤家拓大, 岩下芳久, 北口雅暁, 清水裕彦

日本物理学会講演概要集 77.1 巻 ( 0 ) 頁： 2351 - 2351 2022年

重力波検出のための変位雑音フリー中性子干渉計の開発 (7) Open Access

岩口翔輝, 川﨑祐輝, 石川智浩, 北口雅暁, 山形豊, 西澤篤志, 清水龍真, 梅村来未, 辻健志, 清水裕彦, 道村唯太, 川村静児

日本物理学会講演概要集 77.2 巻 ( 0 ) 頁： 458 - 458 2022年

重力波検出のための変位雑音フリー中性子干渉計の開発 (6) Open Access

川﨑祐輝, 岩口翔輝, 石川智浩, 西澤篤志, 北口雅暁, 山形豊, 清水龍真, 梅村来未, 辻健志, 清水裕彦, 道村唯太, 川村静児

日本物理学会講演概要集 77.2 巻 ( 0 ) 頁： 457 - 457 2022年

複合核を用いた時間反転対称性の破れの探索-偏極原子核の中性子吸収断面積測定- Open Access

奥平琢也, 石角元志, 伊東佑起, 井出郁央, 遠藤駿典, 奥隆之, 河村しほり, 神原理, 亀田健斗, 北口雅暁, 木村敦, 後藤優, 小林龍珠, 酒井健二, 篠原武尚, 嶋達志, 清水裕彦, 高田秀佐, 高橋慎吾, 高橋竜太, 中部倫太郎, 広田克也, 藤家拓大, 土川雄介, 藤岡宏之, 吉岡瑞樹, 吉川大幹, NOPTREXコラボレーション

日本物理学会講演概要集 77.2 巻 ( 0 ) 頁： 357 - 357 2022年

複合核における時間反転対称性破れの探索-実験の計画と偏極原子核の中性子吸収断面積測定- Open Access

奥平琢也, 安部亮太, 石崎貢平, 伊東佑起, 遠藤駿典, 奥隆之, 亀田健斗, 北口雅暁, 木村敦, 酒井健二, 嶋達志, 清水裕彦, 高田秀佐, 広田克也, 藤家拓大, 藤岡宏之, 吉岡瑞樹, 吉川大幹, NOPTREXコラボレーション

日本物理学会講演概要集 77.1 巻 ( 0 ) 頁： 341 - 341 2022年

水素吸蔵Vナノ粒子-中性子小角散乱による未知相互作用探索 Open Access

近藤亮太, 廣本政之, 嶋達志, 中部倫太, 清水裕彦, 北口雅暁, 猪野隆, 三島賢二, 広田克也, 吉岡瑞樹

日本物理学会講演概要集 77.2 巻 ( 0 ) 頁： 311 - 311 2022年

時間反転対称性の破れ探索実験のための偏極La核標的開発の現状 Open Access

伊東佑起, 井出郁央, 石崎貢平, 堀田大稀, 清水裕彦, 北口雅暁, 奥平琢也, 松下琢, 飯沼昌隆, 郡英輝, 與曽井優, 藤田全基, 池田陽一, 谷口貴紀, 岩田高広, 宮地義之, 高梨雄矢, 三浦大輔, NOPTREX Collaboration

日本物理学会講演概要集 77.2 巻 ( 0 ) 頁： 358 - 358 2022年

時間反転対称性の破れの探索に向けた偏極 La 標的の開発 -動的核偏極(DNP)テスト用冷凍機の設計/製作及び核磁気共鳴の測定- Open Access

堀田大稀, 石崎貢平, 伊東佑起, 清水裕彦, 北口雅暁, 松下琢, 飯沼昌隆, 郡英輝, 與曽井優, 石元茂

日本物理学会講演概要集 77.1 巻 ( 0 ) 頁： 344 - 344 2022年

多層膜パルス中性子干渉計の高感度化に向けた開発状況について Open Access

藤家拓大, 日野正裕, 細畠拓也, 市川豪, 北口雅暁, 三島賢二, 関義親, 清水裕彦, 山形豊

日本物理学会講演概要集 77.2 巻 ( 0 ) 頁： 312 - 312 2022年

多層膜パルス中性子干渉計の開発による核散乱長測定の現状 Open Access

藤家拓大, 日野正裕, 細畠拓也, 市川豪, 北口雅暁, 三島賢二, 関義親, 清水裕彦, 山形豊

日本物理学会講演概要集 77.1 巻 ( 0 ) 頁： 383 - 383 2022年

Measurement of nuclear spin relaxation time in lanthanum aluminate for development of polarized lanthanum target Open Access

Ishizaki K., Hotta H., Ide I., Iinuma M., Iwata T., Kitaguchi M., Kohri H., Miura D., Miyachi Y., Ohta T., Shimizu H.M., Yoshikawa H., Yosoi M.

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 1020 巻 2021年12月

記述言語：日本語出版者・発行元：Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

The nuclear spin–lattice relaxation time (T<inf>1</inf>) of lanthanum and aluminum nuclei in a single crystal of lanthanum aluminate doped with neodymium ions is studied to estimate the feasibility of the dynamically polarized lanthanum target applicable to beam experiments. The application of our interest is the study of fundamental discrete symmetries in the spin optics of epithermal neutrons. This study requires a highly flexible choice of the applied magnetic field for neutron spin control and favors longer T<inf>1</inf> under lower magnetic field and at higher temperature. The T<inf>1</inf> of 139La and 27Al was measured under magnetic fields of 0.5–2.5 T and at temperatures of 0.1–1.5 K and found widely distributed up to 100 h. The result suggests that the T<inf>1</inf> can be as long as T<inf>1</inf>∼ 1 h at 0.1 K with a magnetic field of 0.1 T, which partially fulfills the requirement of the neutron beam experiment. Possible improvements to achieve a longer T<inf>1</inf> are discussed.

DOI： 10.1016/j.nima.2021.165845

Web of Science

Scopus

Pendellösung interferometry probes the neutron charge radius, lattice dynamics, and fifth forces Open Access

Heacock B., Fujiie T., Haun R.W., Henins A., Hirota K., Hosobata T., Huber M.G., Kitaguchi M., Pushin D.A., Shimizu H., Takeda M., Valdillez R., Yamagata Y., Young A.R.

Science 373 巻 ( 6560 ) 頁： 1239 - 1243 2021年9月

記述言語：日本語出版者・発行元：Science

Structure factors describe how incident radiation is scattered from materials such as silicon and germanium and characterize the physical interaction between the material and scattered particles. We used neutron Pendellösung interferometry to make precision measurements of the (220) and (400) neutron-silicon structure factors and achieved a factor-of-four improvement in the (111) structure factor uncertainty. These data provide measurements of the silicon Debye-Waller factor at room temperature and the mean square neutron charge radius 〈r<inf>n</inf>2 〉 ¼ -0:1101T0:0089 square femtometers. Combined with existing measurements of the Debye-Waller factor and charge radius, the measured structure factors also improve constraints on the strength of a Yukawa modification to gravity by an order of magnitude over the 20 picometer–to–10 nanometer length scale range.

DOI： 10.1126/science.abc2794

Web of Science

Scopus

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source Open Access

Addazi A., Anderson K., Ansell S., Babu K.S., Barrow J.L., Baxter D.V., Bentley P.M., Berezhiani Z., Bevilacqua R., Biondi R., Bohm C., Brooijmans G., Broussard L.J., Cederc ll J., Crawford C., Dev P.S.B., Dijulio D.D., Dolgov A.D., Dunne K., Fierlinger P., Fitzsimmons M.R., Fomin A., Frost M.J., Gardiner S., Gardner S., Galindo-Uribarri A., Geltenbort P., Girmohanta S., Golubev P., Golubeva E., Greene G.L., Greenshaw T., Gudkov V., Hall-Wilton R., Heilbronn L., Herrero-Garcia J., Holley A., Ichikawa G., Ito T.M., Iverson E., Johansson T., Jönsson L., Jwa Y.J., Kamyshkov Y., Kanaki K., Kearns E., Kokai Z., Kerbikov B., Kitaguchi M., Kittelmann T., Klinkby E., Kobakhidze A., Koerner L.W., Kopeliovich B., Kozela A., Kudryavtsev V., Kupsc A., Lee Y.T., Lindroos M., Makkinje J., Marquez J.I., Meirose B., Miller T.M., Milstead D., Mohapatra R.N., Morishima T., Muhrer G., Mumm H.P., Nagamoto K., Nepomuceno A., Nesti F., Nesvizhevsky V.V., Nilsson T., Oskarsson A., Paryev E., Pattie R.W., Penttil S., Perrey H., Pokotilovski Y.N., Potashnikovav I., Ramic K., Redding C., Richard J.M., Ries D., Rinaldi E., Rizzi N., Rossi N., Ruggles A., Rybolt B., Santoro V., Sarkar U., Saunders A., Senjanovic G., Serebrov A.P., Shimizu H.M., Shrock R., Silverstein S., Silvermyr D., Snow W.M., Takibayev A.

Journal of Physics G Nuclear and Particle Physics 48 巻 ( 7 ) 2021年7月

記述言語：日本語出版者・発行元：Journal of Physics G Nuclear and Particle Physics

The violation of baryon number, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state , and neutron disappearance (n → n′); the effective process of neutron regeneration is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis and the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

DOI： 10.1088/1361-6471/abf429

Open Access

Web of Science

Scopus

Energy-dependent angular distribution of individual γ rays in the la 139 (n,γ) la 140 ∗ reaction Open Access

Okudaira T., Endo S., Fujioka H., Hirota K., Ishizaki K., Kimura A., Kitaguchi M., Koga J., Niinomi Y., Sakai K., Shima T., Shimizu H.M., Takada S., Tani Y., Yamamoto T., Yoshikawa H., Yoshioka T.

Physical Review C 104 巻 ( 1 ) 2021年6月

記述言語：日本語出版者・発行元：Physical Review C

Neutron energy-dependent angular distributions were observed for individual γ rays from the 0.74 eV p-wave resonance of La139+n to several lower excited states of La140. The γ-ray signals were analyzed in a two-dimensional histogram of the γ-ray energy, measured with distributed germanium detectors, and neutron energy, determined with the time-of-flight of pulsed neutrons, to identify the neutron energy dependence of the angular distribution for each individual γ rays. The angular distribution was also found for a photopeak accompanied with a faint p-wave resonance component. Our results can be interpreted as interference between s- and p-wave amplitudes, which may be used to study discrete symmetries of fundamental interactions.

DOI： 10.1103/PhysRevC.104.014601

Web of Science

Scopus

Measurement of γ rays from 6LiF tile as an inner wall of a neutron-decay detector Open Access

Koga J., Ieki S., Kimura A., Kitaguchi M., Kitahara R., Mishima K., Nagakura N., Okudaira T., Otono H., Shimizu H.M., Sumi N., Takada S., Tomita T., Yamada T., Yoshioka T.

Journal of Instrumentation 16 巻 ( 2 ) 2021年2月

記述言語：日本語出版者・発行元：Journal of Instrumentation

A neutron lifetime measurement conducted at the Japan Proton Accelerator Research Complex (J-PARC) is counting the number of electrons from neutron decays with a time projection chamber (TPC). The γ rays produced in the TPC cause irreducible background events. To achieve the precise measurement, the inner walls of the TPC consist of 6Li-enriched lithium-fluoride (6LiF) tiles to suppress the amount of γ rays. In order to estimate the amount of γ rays from the 6LiF tile, prompt gamma ray analysis (PGA) measurements were performed using germanium detectors. We reconstructed the measured γ-ray energy spectrum using a Monte Carlo simulation with the stripping method. Comparing the measured spectrum with a simulated one, the number of γ rays emitted from the6LiF tile was (2.3+0.7-0.3) × 10-4 per incident neutron. This is 1.4+0.5-0.2 times the value assumed for a mole fraction of the 6LiF tile. We concluded that the amount of γ rays produced from the 6LiF tile is not more twice the originally assumed value.

DOI： 10.1088/1748-0221/16/02/P02001

Open Access

Web of Science

Scopus

Neutron Imaging Using a Fine-Grained Nuclear Emulsion Open Access

Hirota K., Ariga T., Hino M., Ichikawa G., Kawasaki S., Kitaguchi M., Mishima K., Muto N., Naganawa N., Shimizu H.M.

Journal of Imaging 7 巻 ( 1 ) 2021年1月

記述言語：日本語出版者・発行元：Journal of Imaging

A neutron detector using a fine-grained nuclear emulsion has a sub-micron spatial resolution and thus has potential to be applied as high-resolution neutron imaging. In this paper, we present two approaches to applying the emulsion detectors for neutron imaging. One is using a track analysis to derive the reaction points for high resolution. From an image obtained with a 9 µm pitch Gd grating with cold neutrons, periodic peak with a standard deviation of 1.3 µm was observed. The other is an approach without a track analysis for high-density irradiation. An internal structure of a crystal oscillator chip, with a scale of approximately 30 µm, was able to be observed after an image analysis.

DOI： 10.3390/jimaging7010004

Open Access

Web of Science

Scopus

117Sn(!LaTeX$\overrightarrow{n}$,γ)反応における捕獲断面積の偏極依存性の測定 Open Access

遠藤駿典, 安部亮太, 石崎貢平, 伊東佑起, 奥隆之, 奥平琢也, 亀田健斗, 北口雅暁, 木村敦, 酒井健二, 嶋達志, 清水裕彦, 高田秀佐, 高橋慎吾, 中井飛翔, 広田克也, 藤家拓大, 藤岡宏之, 吉岡瑞樹, 吉川大幹, NOPTREXコラボレーション

日本物理学会講演概要集 76.2 巻 ( 0 ) 頁： 324 - 324 2021年

Bi12GeO20の結晶内電場の再解析とスピン回転についての考察 Open Access

竹森亮太, 赤塚浩明, 菱田真由, 伊藤茂, 福村省三, 北口雅暁, 清水裕彦

日本物理学会講演概要集 76.1 巻 ( 0 ) 頁： 292 - 292 2021年

131Xe(n,γ)132Xe*反応におけるγ線角度分布測定 Open Access

奥平琢也, 安部亮太, 伊東佑起, 石崎貢平, 遠藤駿典, 奥隆之, 亀田健斗, 北口雅暁, 木村敦, 酒井健二, 嶋達志, 清水裕彦, 高田秀佐, 広田克也, 藤家拓大, 藤岡宏之, 吉岡瑞樹, 吉川大幹, NOPTREXコラボレーション

日本物理学会講演概要集 76.2 巻 ( 0 ) 頁： 323 - 323 2021年

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論文 - 清水　裕彦