Laser control of collision relaxation of excited atoms for highly efficient isotope separation of radioactive cesium

• Project/Area Number: 17H04978
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Nuclear engineering
• Research Institution: Hiroshima Institute of Technology (2019); Hiroshima University (2017-2018)
• Principal Investigator: Matsuoka Leo 広島工業大学, 工学部, 准教授 (50455276)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000); Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2017: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
• Keywords: 原子・分子物理 / 反応・分離工学 / 半導体レーザー / 核変換 / 数理物理 / プラズマ計測

Outline of Final Research Achievements

In this study, we developed an isotope separation method for cesium using a phenomenon called light-induced drift, which is caused by collisional relaxation of the photo-excited state of atoms. We have developed a test system using diode lasers and studied for the improvement of related instruments and the mechanism of the phenomenon. We successfully observed the light-induced drift of cesium experimentally and demonstrated the high effectiveness of the isotope separation method that could have not been predicted by theoretical studies.

Academic Significance and Societal Importance of the Research Achievements

放射性廃棄物の地層処分への負担を軽減するためには、中性子照射等による放射性物質の無害化が有効である。ところが放射性セシウムに関しては有効な同位体分離技術が存在しないため、分離・処分シナリオ全体が影響を受けている。放射性セシウムの高効率分離の実現は、放射性廃棄物処分に関するロードマップを大きく転換させる可能性がある。セシウム原子の光誘導ドリフトはこれまでに観測された例がなく、本研究によってセシウムの高効率同位体分離実現の可能性が実験的に実証された。

Research Products

• [Int'l Joint Research] TNB Research Sdn. Bhd.(マレーシア)
• [Int'l Joint Research] TNB Research Sdn. Bhd.(マレーシア)
• [Int'l Joint Research] KU Leuven(Belgium)
• [Int'l Joint Research] TNB Research Sdn. Bhd.(Malaysia)
• [Journal Article] Development of a stretched absolute wavelength standard using dichroic atomic vapor spectroscopy towards observation of light-induced drift (2019)
  • Author(s): Kusano Y、Nishiya N、Matsuoka L
  • Journal Title: IOP Conference Series: Materials Science and Engineering Volume: 625 Issue: 1 Pages: 012007-012007
  • DOI: 10.1088/1757-899x/625/1/012007
  • Peer Reviewed / Open Access
• [Journal Article] Quantitative analysis and speciation of alkali metal emissions from biomass combustion in a 150 kWth furnace by optical emission spectroscopy (2019)
  • Author(s): Lim Mooktzeng、Matsuoka Leo
  • Journal Title: Chemical Engineering Communications Volume: - Issue: 4 Pages: 1-10
  • DOI: 10.1080/00986445.2019.1647182
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Numerical Study of Change in Shape of Saturated Absorption Spectrum of Argon Arcjet Plasma by Strong Velocity-Changing Collisions (2019)
  • Author(s): Nishiya Noritaka、Matsuoka Leo
  • Journal Title: IEEE Transactions on Plasma Science Volume: 47 Issue: 2 Pages: 1129-1133
  • DOI: 10.1109/tps.2018.2864744
  • Peer Reviewed
• [Journal Article] A quasiclassical trajectory calculation to compute the reaction cross section and thermal rate constant for the cesium exchange reaction 133CsI + 135Cs → 133Cs + I135Cs (2019)
  • Author(s): Kobayashi Takanori、Matsuoka Leo、Yokoyama Keiichi
  • Journal Title: Computational and Theoretical Chemistry Volume: 1150 Pages: 40-48
  • DOI: 10.1016/j.comptc.2019.01.008
  • Peer Reviewed
• [Journal Article] Resonant-tunneling in discrete-time quantum walk (2018)
  • Author(s): Matsue Kaname、Matsuoka Leo、Ogurisu Osamu、Segawa Etsuo
  • Journal Title: Quantum Studies: Mathematics and Foundations Volume: 印刷中 Issue: 1 Pages: 35-44
  • DOI: 10.1007/s40509-017-0151-9
  • Peer Reviewed
• [Journal Article] The continuous-time quantum walk with transition moments of the Gaussian distribution as a mathematical model of rotational excitation in molecules by an optical pulse (2017)
  • Author(s): Matsuoka L、Lavicka H
  • Journal Title: Journal of Physics: Conference Series Volume: 936 Pages: 012075-012075
  • DOI: 10.1088/1742-6596/936/1/012075
  • Open Access / Int'l Joint Research
• [Journal Article] Numerical study of collisional effects in saturated absorption spectrum of argon arcjet plasma (2017)
  • Author(s): Matsuoka L.、Nishiya N.、Yuki K.、Sonoyama Y.
  • Journal Title: Journal of Instrumentation Volume: 12 Issue: 11 Pages: C11023-C11023
  • DOI: 10.1088/1748-0221/12/11/c11023
  • Peer Reviewed
• [Presentation] 光誘導ドリフトによるセシウムの高効率同位体分離の安定同位体実験 (2020)
  • Author(s): 松岡 雷士、草野 雄也、西谷 徳高、吉村 善治、中野 圭視、後藤 仁志、溝口 亮、松下 智悟、結城 謙太、小林 孝徳
  • Organizer: 日本原子力学会2020年春の年会
• [Presentation] 速度変化衝突が支配的な圧力でのセシウム原子のレーザー分光と運動制御 (2019)
  • Author(s): 松岡雷士、草野雄也、吉村善治、中野圭視、西谷徳高、結城謙太、鈴木千尋
  • Organizer: 「プラズマ分光計測と原子分子素過程研究の融合最前線」 「原子分子データ応用フォーラムセミナー」 合同研究会
• [Presentation] Quantitative Analysis and Speciation of Alkali Metal Emissions from Biomass Combustion in A 150 Kw Furnace by Optical Emission Spectroscopy (2019)
  • Author(s): Lim Mooktzeng、Matsuoka Leo
  • Organizer: ENERGY SECURITY AND CHEMICAL ENGINEERING CONGRESS 2019
  • Int'l Joint Research
• [Presentation] Development of a stretched absolute wavelength standard using dichroic atomic vapor spectroscopy towards observation of light-induced drift (2019)
  • Author(s): Yuya Kusano, Noritaka Nishiya, Leo Matsuoka
  • Organizer: 2019 the 3rd International Conference on Materials Engineering and Nano Sciences (ICMENS 2019)
  • Int'l Joint Research
• [Presentation] Development of a Highly Efficient Laser-based Method of Radioactive Cs Isotope Separation Utilizing Light-induced Drift (2019)
  • Author(s): Leo Matsuoka
  • Organizer: 2019 the 3rd International Conference on Materials Engineering and Nano Sciences (ICMENS 2019)
  • Int'l Joint Research / Invited
• [Presentation] Development of a finesse tunable resonator for massive population control of cesium atoms (2018)
  • Author(s): Honoka Yokoro, Yuya Kusano, Noritaka Nishiya, Leo Matsuoka
  • Organizer: The 2nd International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Utilization of blue diode laser for detection and control of the alkali metal atomic vapor (2018)
  • Author(s): Keishi Nakano, Mooktzeng Lim, Leo Matsuoka
  • Organizer: The 2nd International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Development of an experimental system for velocity measurement of light-induced drift of cesium atoms (2018)
  • Author(s): Yuya Kusano, Noritaka Nishiya, Leo Matsuoka
  • Organizer: The 2nd International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Development of a laser system for spatially-resolved measurement of the parameter distribution in an arcjet plasma (2018)
  • Author(s): Yoshiharu Yoshimura, Leo Matsuoka, Taiichi Shikama, Chihiro Suzuki, Shinichi Namba
  • Organizer: The 2nd International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Numerical simulation of saturated absorption spectrum as a detection method of velocity-changing collisions (2018)
  • Author(s): Noritaka Nishiya, Leo Matsuoka
  • Organizer: The 2nd International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Development of a laser system for observation of light-induced drift of Cs atoms (2018)
  • Author(s): Yuya Kusano, Noritaka Nishiya, Leo Matsuoka
  • Organizer: The 13th Pacific Rim Conference on Lasers and Electro-Optics (CLEO Pacific Rim, CLEO-PR 2018)
  • Int'l Joint Research
• [Presentation] Visualization of a periodic structure in arcjet plasma by laser absorption spectroscopy (2018)
  • Author(s): Yoshiharu Yoshimura, Yutaro Sonoyama, Chihiro Suzuki, Leo Matsuoka
  • Organizer: The 13th Pacific Rim Conference on Lasers and Electro-Optics (CLEO Pacific Rim, CLEO-PR 2018)
  • Int'l Joint Research
• [Presentation] 原子力工学と量子ウォークのインタラクション (2018)
  • Author(s): 松岡雷士
  • Organizer: 岡山-広島 解析・確率論セミナー 2018
  • Invited
• [Presentation] 放射性セシウムの高効率レーザー同位体分離：原子法の新展開 (2017)
  • Author(s): 松岡雷士
  • Organizer: 日本原子力学会中国・四国支部 第７回通常支部大会・講演会
  • Invited
• [Presentation] Numerical simulation of saturated absorption spectroscopy of Argon arcjet plasma with the effect of velocity changing collision (2017)
  • Author(s): Noritaka Nishiya
  • Organizer: The 1st International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Dichroic atomic vapor spectroscopy of Cesium for development of laser system with widely tunable stabilized wavelength (2017)
  • Author(s): Yuya Kusano
  • Organizer: The 1st International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Development of a laser system for visualization of shock wave structure in arcjet plasma (2017)
  • Author(s): Yoshiharu Yoshimura
  • Organizer: The 1st International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Spatially-resolved laser absorption spectroscopy of argon arcjet plasma (2017)
  • Author(s): Yutaro Sonoyama
  • Organizer: The 1st International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] Mathematical analysis of isotope-selective localization on rotational states in diatomic molecules induced by a train of optical pulses (2017)
  • Author(s): Kenta Yuki
  • Organizer: The 1st International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] 遷移行列の対角成分に由来する連続時間量子ウォークの局在化の数理解析 (2017)
  • Author(s): 結城謙太
  • Organizer: ＩＭＩ短期共同研究： レーザー同位体分離の実用化における量子ウォークの数理
  • Invited
• [Presentation] The continuous-time quantum walk with transition moments of the Gaussian distribution as a mathematical model of rotational excitation in molecules by an optical pulse (2017)
  • Author(s): L Matsuoka、H Lavicka
  • Organizer: 6th International Conference on Mathematical Modeling in Physical Sciences (IC-MSQUARE)
  • Int'l Joint Research
• [Presentation] 光誘起ドリフト発生条件における飽和吸収スペクトルの数値シミュレーション (2017)
  • Author(s): 西谷徳高、松岡雷士
  • Organizer: 日本原子力学会 中国・四国支部 第1１回研究発表会
• [Presentation] 光誘起ドリフト実験に向けた二色性原子蒸気分光法によるレーザー波長の広範囲安定化 (2017)
  • Author(s): 草野雄也、西谷徳高、松岡雷士
  • Organizer: 日本原子力学会 中国・四国支部 第1１回研究発表会
• [Presentation] Numerical study of collisional effects in saturated absorption spectrum of Argon arcjet plasma (2017)
  • Author(s): Leo Matsuoka, Noritaka Nishiya, Kenta Yuki, Yutaro Sonoyama
  • Organizer: 18th, Laser Aided Plasma Diagnostics
  • Int'l Joint Research
• [Presentation] 量子ウォーク数理に基づいた光共振器の概念設計 (2017)
  • Author(s): 松岡雷士
  • Organizer: 5th Yokohama workshop in Quantum walks
• [Presentation] 連続時間量子ウォークとマシュー関数との対応 (2017)
  • Author(s): 結城謙太
  • Organizer: 5th Yokohama workshop in Quantum walks
• [Presentation] レーザー吸収分光によるアークジェットプラズマ中の原子速度分布の解析 (2017)
  • Author(s): 吉村 善治、園山 裕太郎、前田 佑一郎、西谷 徳高、草野 雄也、松岡 雷士
  • Organizer: Plasma Conference 2017
• [Presentation] Utilization of a Blue Diode Laser for Visual Observation of Cesium Vapor (2017)
  • Author(s): Leo Matsuoka, Yuya Kusano, Noritaka Nishiya
  • Organizer: The 6th Joint Conference on Renewable Energy and Nanotechnology - JCREN 2017
  • Int'l Joint Research
• [Presentation] Development of a laser system stabilized with dichroic atomic vapor spectroscopy toward isotope separation of radioactive cesium utilizing light-induced drift (2017)
  • Author(s): Yuya Kusano, Noritaka Nishiya, Kenta Yuki, Leo Matsuoka
  • Organizer: The 6th Joint Conference on Renewable Energy and Nanotechnology - JCREN 2017
  • Int'l Joint Research
• [Presentation] Numerical Study of Change in Shape of Saturated Absorption Spectrum of Argon Arc Jet Plasma by Strong Velocity-Changing Collisions (2017)
  • Author(s): Noritaka Nishiya, Leo Matsuoka
  • Organizer: The 10th Asia-Pacific International Symposium on the Basics and Applications of Plasma Technology (APSPT-10)
  • Int'l Joint Research
• [Presentation] Spatially resolved laser absorption spectroscopy of argon arcjet plasma (2017)
  • Author(s): Yutaro Sonoyama, Yoshiharu Yoshimura, Yuichiro Maeda, Chihiro Suzuki, Leo Matsuoka
  • Organizer: The 10th Asia-Pacific International Symposium on the Basics and Applications of Plasma Technology (APSPT-10)
  • Int'l Joint Research
• [Presentation] アークジェットプラズマの空間分解レーザー吸収分光 (2017)
  • Author(s): 松岡雷士、園山裕太郎、西谷徳高、吉村善治、前田佑一郎、溝口亮、草野雄也、結城謙太
  • Organizer: 「原子分子素過程研究と受動・能動分光計測の高度化のシナジー効果によるプラズマ科学の新展開」「原子分子データ応用フォーラムセミナー」合同研究会
• [Remarks] 広島工業大学工学部電気システム工学科教員紹介
  • URL: http://www.it-hiroshima.ac.jp/faculty/engineering/electrical/teacher/leo_matsuoka/seminar/