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論文

Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms

西村 昇一郎*; 鳥居 寛之*; 深尾 祥紀*; 伊藤 孝; 岩崎 雅彦*; 神田 聡太郎*; 川越 清以*; Kawall, D.*; 河村 成肇*; 黒澤 宣之*; et al.

Physical Review A, 104(2), p.L020801_1 - L020801_6, 2021/08

 被引用回数:12 パーセンタイル:84.06(Optics)

As a method to determine the resonance frequency, Rabi-oscillation spectroscopy has been developed. In contrast to conventional spectroscopy which draws the resonance curve, Rabi-oscillation spectroscopy fits the time evolution of the Rabi oscillation. By selecting the optimized frequency, it is shown that the precision is twice as good as conventional spectroscopy with a frequency sweep. Furthermore, the data under different conditions can be treated in a unified manner, allowing more efficient measurements for systems consisting of a limited number of short-lived particles produced by accelerators such as muons. We have developed a fitting function that takes into account the spatial distribution of muonium and the spatial distribution of the microwave intensity to apply this method to ground-state muonium hyperfine structure measurements at zero field. It was applied to the actual measurement data, and the resonance frequencies were determined under various conditions. The result of our analysis gives $$nu_{rm HFS}$$ = 4 463 301.61 $$pm$$ 0.71 kHz.

論文

Study of quasielastic barrier distributions as a step towards the synthesis of superheavy elements with hot fusion reactions

田中 泰貴*; 森田 浩介*; 森本 幸司*; 加治 大哉*; 羽場 宏光*; Boll, R. A.*; Brewer, N. T.*; Van Cleve, S.*; Dean, D. J.*; 石澤 倫*; et al.

Physical Review Letters, 124(5), p.052502_1 - 052502_6, 2020/02

 被引用回数:15 パーセンタイル:80.61(Physics, Multidisciplinary)

The excitation functions for quasielastic scattering of $$^{22}$$Ne+$$^{248}$$Cm, $$^{26}$$Mg+$$^{248}$$Cm, $$^{48}$$Ca+$$^{238}$$U are measured using a gas-filled recoil ion separator The quasielastic barrier distributions are extracted for these systems and are compared with coupled-channel calculations. The results indicate that the barrier distribution is affected dominantly by deformation of the actinide target nuclei, but also by vibrational or rotational excitations of the projectile nuclei, as well as neutron transfer processes before capture. From a comparison between the experimental barrier distributions and the evaporation residue cross sections for Sg (Z=106), Hs (108), Cn (112), and Lv (116), it is suggested that the hot fusion reactions take advantage of a compact collision, where the projectile approaches along the short axis of a prolately deformed nucleus. A new method is proposed to estimate the optimum incident energy to synthesize unknown superheavy nuclei using the barrier distribution.

論文

Multi-step magnetic transitions in EuNiIn$$_4$$

池田 修悟*; 金子 耕士; 田中 佑季*; 川崎 卓郎; 花島 隆泰*; 宗像 孝司*; 中尾 朗子*; 鬼柳 亮嗣; 大原 高志; 望月 健生*; et al.

Journal of the Physical Society of Japan, 89(1), p.014707_1 - 014707_7, 2020/01

 被引用回数:0 パーセンタイル:12.26(Physics, Multidisciplinary)

Magnetism in EuNiIn$$_4$$ has been studied by specific heat, magnetic susceptibility, magnetization, $$^{151}$$Eu M$"o$ssbauer spectroscopy, and neutron diffraction experiments. The specific heat shows two magnetic transitions at $$T_{rm N1}$$ and $$T_{rm N2}$$ at zero magnetic field. An antiferromagnetic ground state of EuNiIn$$_4$$ has a uniaxial magnetic anisotropy along the b-axis, revealed by the magnetic susceptibility and the M$"o$ssbauer spectroscopy. Single crystal neutron diffraction experiments clarify that this antiferromagnetic structure in the ground state is characterized by the commensurate propagation vector $$q$$ = (1/2, 1/2, 1/2) which reveals no distinct anomaly at $$T_{rm N2}$$. The magnetization curve along the b-axis at 2 K shows four successive magnetic field-induced transitions up to 50 kOe and, reaches 7 $${mu}_{rm B}$$/f.u. above 190 kOe, The magnetic phase diagram in EuNiIn$$_4$$ has unique characteristics with five magnetic states in low magnetic field.

論文

New precise measurements of muonium hyperfine structure at J-PARC MUSE

Strasser, P.*; 阿部 充志*; 青木 正治*; Choi, S.*; 深尾 祥紀*; 東 芳隆*; 樋口 嵩*; 飯沼 裕美*; 池戸 豊*; 石田 勝彦*; et al.

EPJ Web of Conferences, 198, p.00003_1 - 00003_8, 2019/01

 被引用回数:13 パーセンタイル:99.28

High precision measurements of the ground state hyperfine structure (HFS) of muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants of the muon magnetic moment and mass, and searches for new physics. Muonium is the most suitable system to test QED because both theoretical and experimental values can be precisely determined. Previous measurements were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is planning complementary measurements of muonium HFS both at zero and high magnetic field. The new high-intensity muon beam that will soon be available at H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation for high-field measurements, and the latest results at zero field are presented.

論文

Structure of active sites of Fe-N-C nano-catalysts for alkaline exchange membrane fuel cells

岸 浩史*; 坂本 友和*; 朝澤 浩一郎*; 山口 進*; 加藤 豪士*; Zulevi, B.*; Serov, A.*; Artyushkova, K.*; Atanassov, P.*; 松村 大樹; et al.

Nanomaterials (Internet), 8(12), p.965_1 - 965_13, 2018/12

 被引用回数:10 パーセンタイル:49.61(Chemistry, Multidisciplinary)

Platinum group metal-free catalysts based on transition metal-nitrogen-carbon nanomaterials have been studied by a combination of in situ X-ray spectroscopy techniques, high-resolution transmission electron microscope, M$"o$ssbauer spectroscopy, electrochemical methods and density functional theory. Fe-N-C oxygen reduction reaction electrocatalysts were synthesized by varying several synthetic parameters to obtain nanomaterials with different composition and morphology. Associated with Fe-N$$_x$$ motive and the presence of Fe metallic particles in the electrocatalysts showed the clear differences in the variation of composition; processing and treatment conditions of sacrificial support method. From the results of material characterization; catalytic activity and theoretical studies; Fe metallic particles (coated with carbon) are main contributors into the HO$$_{2}$$$$^{-}$$ generation.

論文

Revising the 4${it f}$ symmetry in CeCu$$_{2}$$Ge$$_{2}$$; Soft X-ray absorption and hard X-ray photoemission spectroscopy

荒谷 秀和*; 中谷 泰博*; 藤原 秀紀*; 川田 萌樹*; 金井 惟奈*; 山神 光平*; 藤岡 修平*; 濱本 諭*; 久我 健太郎*; 木須 孝幸*; et al.

Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09

AA2018-0352.pdf:1.16MB

 被引用回数:4 パーセンタイル:26.15(Materials Science, Multidisciplinary)

We present a detailed study on the $$4f$$ ground state symmetry of the pressure-induced superconductor CeCu$$_2$$Ge$$_2$$ probed by soft X-ray absorption and hard X-ray photoemission spectroscopy. The revised Ce $$4f$$ ground states are determined as $$|{Gamma_7}rangle=sqrt{0.45}|{J_{z}=pm frac{5}{2}}rangle - sqrt{0.55}|{mp frac{3}{2}}rangle$$ with $$Sigmamathchar`-{rm type}$$ in-plane rotational symmetry. This gives an in-plane magnetic moment consistent with the antiferromagnetic moment as reported in neutron measurements. Since the in-plane symmetry is the same as that for the superconductor CeCu$$_2$$Si$$_2$$, we propose that the charge distribution along the $$c$$-axis plays an essential role in driving the system into a superconducting phase.

論文

Retreat from stress; Rattling in a planar coordination

末國 晃一郎*; Lee, C. H.*; 田中 博己*; 西堀 英治*; 中村 篤*; 笠井 秀隆*; 森 仁志*; 臼井 秀知*; 越智 正之*; 長谷川 巧*; et al.

Advanced Materials, 30(13), p.1706230_1 - 1706230_6, 2018/03

 被引用回数:44 パーセンタイル:88.69(Chemistry, Multidisciplinary)

高性能デバイスとしての熱電材料には、高い電気伝導度と低い熱伝導度という相反する要求を同時に満たす必要がある。本研究では、テトラへドライト(Cu,Zn)$$_{12}$$(Sb,As)$$_{4}$$S$$_{13}$$の結晶構造とフォノンダイナミクスを調べ、平面内に配位している銅原子のラットリング運動がフォノンを効率良く散乱することを見出した。これらの知見は、平面配位構造を有する高性能熱電材料の新たな開発指針を与えるものである。

論文

Determination of fusion barrier distributions from quasielastic scattering cross sections towards superheavy nuclei synthesis

田中 泰貴*; 成清 義博*; 森田 浩介*; 藤田 訓裕*; 加治 大哉*; 森本 幸司*; 山木 さやか*; 若林 泰生*; 田中 謙伍*; 武山 美麗*; et al.

Journal of the Physical Society of Japan, 87(1), p.014201_1 - 014201_9, 2018/01

 被引用回数:16 パーセンタイル:73.53(Physics, Multidisciplinary)

ガス充填型反跳生成核分離装置GARISを用いて$$^{48}$$Ca + $$^{208}$$Pb, $$^{50}$$Ti + $$^{208}$$Pb, $$^{48}$$Ca + $$^{248}$$Cm反応系における準弾性散乱断面積の励起関数を測定した。これらのデータから融合障壁分布を導出し、チャンネル結合計算と比較した。$$^{48}$$Ca + $$^{208}$$Pb及び$$^{50}$$Ti + $$^{208}$$Pb反応の障壁分布のピークエネルギーはそれらの反応系における2中性子蒸発断面積のピークエネルギーと良く一致し、一方$$^{48}$$Ca + $$^{248}$$Cm反応の障壁分布のピークエネルギーは4中性子蒸発断面積のピークエネルギーより少し下に現れることが判った。この結果は超重核合成の際の最適ビームエネルギーの予測に役立つ情報を与える。

論文

New precise measurement of muonium hyperfine structure interval at J-PARC

上野 恭裕*; 青木 正治*; 深尾 祥紀*; 東 芳隆*; 樋口 嵩*; 飯沼 裕美*; 池戸 豊*; 石田 勝彦*; 伊藤 孝; 岩崎 雅彦*; et al.

Hyperfine Interactions, 238(1), p.14_1 - 14_6, 2017/11

 被引用回数:3 パーセンタイル:86.59

MuSEUM is an international collaboration aiming at a new precise measurement of the muonium hyperfine structure at J-PARC (Japan Proton Accelerator Research Complex). Utilizing its intense pulsed muon beam, we expect a ten-fold improvement for both measurements at high magnetic field and zero magnetic field. We have developed a sophisticated monitoring system, including a beam profile monitor to measure the 3D distribution of muonium atoms to suppress the systematic uncertainty.

論文

Pyroelectric power generation with ferroelectrics (1-x)PMN-xPT

Kim, J.*; 山中 暁*; 中島 啓*; 加藤 孝典*; Kim, Y.*; 福田 竜生; 吉井 賢資; 西畑 保雄; 馬場 将亮*; 武田 雅敏*; et al.

Ferroelectrics, 512(1), p.92 - 99, 2017/08

 被引用回数:14 パーセンタイル:56.38(Materials Science, Multidisciplinary)

We have been investigating a novel electrothermodynamic cycle based on temporal temperature variations using the pyroelectric effect to utilize the waste heat as renewable energy. An improved generating performance with relaxer ferroelectric ceramics was achieved using 75Pb(Mg$$_{2/3}$$Nb$$_{1/3}$$)O$$_3$$-25PbTiO$$_3$$ which is well known for the high dielectric and pyroelectric properties. The potential was evaluated by using the hysteresis loops and generating properties are analyzed both in laboratory and engine dynamometer. Results showed 0.48 mW/cm$$^3$$ in engine dynamometer assessment, which is 3 times larger than the previous study using Pb(Zr,Ti)O$$_3$$.

論文

Study of catalytic reaction at electrode-electrolyte interfaces by a CV-XAFS method

草野 翔吾*; 松村 大樹; 朝澤 浩一郎*; 岸 浩史*; 坂本 友和*; 山口 進*; 田中 裕久*; 水木 純一郎*

Journal of Electronic Materials, 46(6), p.3634 - 3638, 2017/06

 被引用回数:3 パーセンタイル:19.95(Engineering, Electrical & Electronic)

A method combining cyclic voltammetry (CV) with X-ray absorption fine structure (XAFS) spectroscopy, viz. CV-XAFS, has been developed to enable in situ real-time investigation of atomic and electronic structures related to electrochemical reactions. We use this method to study the reaction of a Pt/C cathode catalyst in the oxygen reduction reaction (ORR) in an alkaline electrolyte. It was found that the current induced by the ORR was first observed at approximately 0.08 V versus Hg/HgO, although the Pt valence remained almost unchanged. The electronic structure of the catalytic surface in the ORR was observed to be different in the negative and positive scan directions of CV measurements. Hydrogen adsorption is also discussed on the basis of the observation of this spectral change. We have demonstrated that CV-XAFS provides dynamical structural and electronic information related to electrochemical reactions and can be used for in situ real-time measurements of a catalyst.

論文

Relationship between the material properties and pyroelectric-generating performance of PZTs

山中 暁*; Kim, J.*; 中島 啓*; 加藤 孝典*; Kim, Y.*; 福田 竜生; 吉井 賢資; 西畑 保雄; 馬場 将亮*; 山田 昇*; et al.

Advanced Sustainable Systems (Internet), 1(3-4), p.1600020_1 - 1600020_6, 2017/04

プロジェクトとして取り組んできている自動車排ガスを用いた温度変化発電に関し、変換素子の材料選定等に重要となる性能指数について、素子の物理量の温度変化の測定を行うことで調べた。測定結果を用い、これまで提案されていたいくつかの性能指数の温度変化を詳しく調べて比較することで、$$F_D$$と呼ばれる指数が最も発電量との相関が高いことを示した。この指数には唯一誘電正接($$tandelta$$)が含まれており、誘電体内での電気エネルギー損失が重要であることを示唆する結果となっている。

論文

New muonium HFS measurements at J-PARC/MUSE

Strasser, P.*; 青木 正治*; 深尾 祥紀*; 東 芳隆*; 樋口 嵩*; 飯沼 裕美*; 池戸 豊*; 石田 勝彦*; 伊藤 孝; 岩崎 雅彦*; et al.

Hyperfine Interactions, 237(1), p.124_1 - 124_9, 2016/12

 被引用回数:7 パーセンタイル:91.29

At the Muon Science Facility (MUSE) of J-PARC (Japan Proton Accelerator Research Complex), the MuSEUM collaboration is planning new measurements of the ground state hyperfine structure (HFS) of muonium both at zero field and at high magnetic field. The previous measurements were performed both at LAMPF (Los Alamos Meson Physics Facility) with experimental uncertainties mostly dominated by statistical errors. The new high intensity muon beam that will soon be available at MUSE H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation, and the results of a first commissioning test experiment at zero field are presented.

論文

Nitrogen hot trap design and manufactures for lithium test loop in IFMIF/EVEDA project

若井 栄一; 渡辺 一慶*; 伊藤 譲*; 鈴木 晶大*; 寺井 隆幸*; 八木 重郎*; 近藤 浩夫; 金村 卓治; 古川 智弘; 平川 康; et al.

Plasma and Fusion Research (Internet), 11, p.2405112_1 - 2405112_4, 2016/11

BB2015-1982.pdf:2.03MB

The lithium target facility of IFMIF (International Fusion Materials Irradiation Facility) consists of target assembly, lithium main loop, lithium purification loops, the diagnostic systems, and remote handling system. Major impurities in the lithium loop are proton, deuterium, tritium, 7-Be, activated corrosion products and the other species (C, N, O). It is very important to remove nitrogen content in lithium loop during operation, in order to avoid the corrosion/erosion of the nozzle of lithium target for the stable lithium flow on the target assembly. Nitrogen in the lithium can be removed by N hot trap using Fe-5at%Ti alloy at temperatures from 400 to 600$$^{circ}$$C. In this study, the specification and the detailed design were evaluated, and the component of N hot trap system was fabricated.

論文

Development of a design support system for geological disposal using a CIM concept

杉田 裕; 河口 達也; 畑中 耕一郎; 新保 弘*; 山村 正人*; 小林 優一*; 藤澤 康雄*; 小林 一郎*; 矢吹 信喜*

Proceedings of 16th International Conference on Computing in Civil and Building Engineering (ICCCBE 2016) (Internet), p.1173 - 1182, 2016/07

本論文は、原子力機構が開発を進めている、地層処分場の設計を合理的に行う設計支援システム(Integrated System for Repository Engineering: iSRE)の開発状況について国際学会において発表するものである。本システム開発の基本的な考え方として、共通のデータモデルを介してプロジェクトの3次元モデル及び関連データを共有するCIM技術を利用している。地層処分事業に適用する設計支援システムとしてのiSREの開発目標、設計要件および機能、iSREの基本構造、iSREの具体化として、保存すべきデータモデルの項目とシステム全体の構成、iSREの主要なデータベース、ならびにそれらと外部システム及び外部データベースとの連携を可能とするインターフェースの設計について示す。一部のデータベースとインターフェースの試作を行い、データモデルを作成するとともに、iSREの運用シナリオを想定しつつ、データモデルを用いたiSREの適用性の検討を行い、地層処分事業に適応するiSREの具体的な開発の見通しを得るとともに、iSREが処分場の設計に対して有用であることを確認した。

論文

Radiation response of silicon carbide metal-oxide-semiconductor transistors in high dose region

大島 武; 横関 貴史; 村田 航一; 松田 拓磨; 三友 啓; 阿部 浩之; 牧野 高紘; 小野田 忍; 土方 泰斗*; 田中 雄季*; et al.

Japanese Journal of Applied Physics, 55(1S), p.01AD01_1 - 01AD01_4, 2016/01

 被引用回数:12 パーセンタイル:55.22(Physics, Applied)

In this study, we report the effects of $$gamma$$-ray irradiation and subsequent annealing on the electrical characteristics of vertical structure power 4H Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) with the blocking voltage of 1200 V. The MOSFETs were irradiated with $$gamma$$-rays up to 1.2 MGy in a N$$_{2}$$ atmosphere at room temperature (RT). During the irradiation, no bias was applied to each electrode of the MOSFETs. After the irradiation, the MOSFETs were kept at RT for 240 h to investigate the stability of their degraded characteristics. Then, the irradiated MOSFETs were annealed up to 360 $$^{circ}$$C in the atmosphere. The current-voltage (I-V) characteristics of the MOSFETs were measured at RT. By 1.2 MGy irradiation, the shift of threshold voltage (V$$_{T}$$) for the MOSFETs was -3.39 V. After RT preservation for 240 h, MOSFETs showed no significant recovery in V$$_{T}$$. By annealing up to 360 $$^{circ}$$C, the MOSFETs showed remarkable recovery, and the values of V$$_{T}$$ become 91 % of the initial values. Those results indicate that the degraded characteristics of SiC MOSFETs can be recovered by thermal annealing at 360 $$^{circ}$$C.

論文

A Development of super radiation-hardened power electronics using silicon carbide semiconductors; Toward MGy-class radiation resistivity

土方 泰斗*; 三友 啓*; 松田 拓磨*; 村田 航一*; 横関 貴史*; 牧野 高紘; 武山 昭憲; 小野田 忍; 大久保 秀一*; 田中 雄季*; et al.

Proceedings of 11th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications (RASEDA-11) (Internet), p.130 - 133, 2015/11

In order to develop semiconductor devices with MGy radiation resistivity, we are developing power metal-oxide-semiconductor field-effect-transistors (MOSFETs) based on silicon carbide (SiC) semiconductors. The $$gamma$$-ray irradiation responses of power SiC-MOSFETs were studied under various irradiation temperatures and humidity with various gate-bias conditions. Making comparisons between these responses, the optimum device operating condition and a better device structure were derived and MGy resistivity was achieved. Besides, $$gamma$$-ray irradiation tests for a motor-driver circuits consisting of SiC-MOSFETs were carried out, and as a result, their continuous operation up to 2 MGy was confirmed.

論文

Effect of humidity and temperature on the radiation response of SiC MOSFETs

武山 昭憲; 松田 拓磨; 横関 貴史; 三友 啓; 村田 航一; 牧野 高紘; 小野田 忍; 田中 雄季*; 神取 幹郎*; 吉江 徹*; et al.

Proceedings of 11th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications (RASEDA-11) (Internet), p.134 - 137, 2015/11

Influence of $$gamma$$-ray irradiation under high temperature and high humidity circumstance on the electrical characteristics of Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) was investigated. The drain current (I$$_{D}$$)-gate voltage (V$$_{G}$$) curves shifted to the negative voltage side and no significant further shift was observed with increasing the dose above 10 kGy. Suppression of the negative shift of threshold voltage (V$$_{th}$$) means that positive charges generated by irradiation were thermally annealed by elevated temperature during irradiation. The leakage current slightly increased at 5 and 10 kGy, however, those values recovered to be approximately the initial value above 40 kGy. Humidity circumstance attributed to remarkable suppression of the leakage current in comparison with dry circumstance.

論文

Application of neutron stress measurement to reinforced concrete structure

鈴木 裕士; 楠 浩一*; 兼松 学*; 田才 晃*; 畠中 雄一*; 土屋 直子*; Bae, S.*; 白石 聖*; 櫻井 園子*; 川崎 卓郎; et al.

JPS Conference Proceedings (Internet), 8, p.031006_1 - 031006_6, 2015/09

鉄筋とコンクリート間の付着抵抗は、コンクリート構造物の一体性を確保する上で重要なパラメータであり、コンクリートに埋設された鉄筋のひずみ分布を測定することにより評価される。本研究では、飛行時間中性子回折法を用いて、コンクリート内部の鉄筋に発生する応力・ひずみ分布測定を試みた。その結果、コンクリートのひび割れ発生や鉄筋腐食に伴う付着劣化の様子を捉えることにも成功するなど、コンクリートに埋設された鉄筋の応力測定技術として、中性子回折法が有効な手段になり得ることを示した。

論文

Novel electrothermodynamic power generation

Kim, Y.*; Kim, J.*; 山中 暁*; 中島 啓*; 小川 孝*; 芹沢 毅*; 田中 裕久*; 馬場 将亮*; 福田 竜生; 吉井 賢資; et al.

Advanced Energy Materials, 5(13), p.1401942_1 - 1401942_6, 2015/07

 被引用回数:18 パーセンタイル:60.6(Chemistry, Physical)

空中に廃棄されている自動車排ガスの廃熱の再利用は、現在社会のエネルギー問題の重要な位置を占めるが、その一つとして強誘電体(焦電体)の誘電・焦電効果を応用したエネルギー回生技術の研究が進められている。焦電体を自動車排ガス中に設置するとともに、エンジン運転に伴う熱振動に同期した電場を外部から加えることで、回生エネルギーは大幅に上昇する。本研究ではこの時用いる取り出し電気回路の改良を行うとともに、典型的な焦電体PbZr$$_x$$Ti$$_{1-x}$$O$$_3$$(PZT)を用いて実際に有効活用できる回生エネルギーが非常に小さいながらもプラスであることを初めて確認した。また回生運転と同時測定した時分割X線回折により、焦電体の結晶構造の変化やドメイン比といったミクロな機構に関する知見を得るとともに、さらに実機エンジンを用いた試験でも実際に有効活用できる回生エネルギーの取得を確認できた。

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