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Observation of hyperfine structure of positronium using a static periodic magnetic field

Research Project

Project/Area Number 19K12645
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 80040:Quantum beam science-related
Research InstitutionTokyo University of Science

Principal Investigator

Nagata Yugo  東京理科大学, 理学部第二部物理学科, 助教 (30574115)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsポジトロニウム / 運動誘起共鳴 / 原子分光 / コヒーレント共鳴励起 / 陽電子 / sub-THz波 / 原子物理 / 磁気共鳴 / テラヘルツ波 / 原子共鳴
Outline of Research at the Start

速度可変ポジトロニウムビームを用いて、静周期場による原子の共鳴(運動誘起共鳴)によるポジトロニウムの超微細構造(203 GHz)の観測を超高真空中で行う。成功すれば、運動誘起共鳴のテラヘルツ波帯での初めての実証、運動誘起共鳴による反物質あるいはエキゾチック原子の系での初めての測定となる。従って運動誘起共鳴の原理の検証とともに、運動誘起共鳴による反物質研究の第一歩となる。さらに、従来の研究より10倍良い精度で精密分光を試み、ポジトロニウム超微細構造の直接測定による量子電磁力学(QED)の検証を行う。

Outline of Final Research Achievements

Positronium (Ps), composed of a positron and an electron, has hyperfine structure in the ground state. The measurement of the transition frequency is attracting attention for the QED test. In this study, we tried to observe motion-induced resonance (MIR) using an energy-tunable Ps beam. To produce a periodic magnetic field, the multi-layered magnetic grating was developed using iron foils. We succeeded in observing the MIR of the hyperfine structure of the Ps atom. This is the first observation of the MIR in the sub-THz region, and the first step for the antimatter research using the MIR.

Academic Significance and Societal Importance of the Research Achievements

ポジトロニウム(Ps)の基底状態の超微細構造遷移周波数203 GHzの測定はQEDのテストとして注目されており、従来、マイクロ波やレーザーによって測定されてきた。今回、運動誘起共鳴(MIR)による新しい測定方法を実証することができた。また、多層磁気格子が生成する周期磁場の強度は、電磁波のパワーに換算すると100 MW/cm2にも達し、これは従来の方法に対して1万倍強力であることが分かった。この測定はMIRのテラヘルツ波帯での初めての観測であり、さらにMIRによる反物質研究の第一歩となった。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (23 results)

All 2022 2021 2020 2019

All Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (18 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results)

  • [Journal Article] Measurement of the principal quantum number distribution in a beam of antihydrogen atoms2021

    • Author(s)
      Kolbinger B.、Amsler C.、Cuendis S. Arguedas、Breuker H.、Capon A.、Costantini G.、Dupre P.、Fleck M.、Gligorova A.、Higaki H.、Kanai Y.、Kletzl V.、Kuroda N.、Lanz A.、Leali M.、Maeckel V.、Malbrunot C.、Mascagna V.、Massiczek O.、Matsuda Y.、Murtagh D. J.、Nagata Y.、Nanda A. et al.
    • Journal Title

      The European Physical Journal D

      Volume: 75 Issue: 3 Pages: 91-91

    • DOI

      10.1140/epjd/s10053-021-00101-y

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Motion-Induced Transition of Positronium through a Static Periodic Magnetic Field in the Sub-THz Region2020

    • Author(s)
      Nagata Y.、Michishio K.、Iizuka T.、Kikutani H.、Chiari L.、Tanaka F.、Nagashima Y.
    • Journal Title

      Physical Review Letters

      Volume: 124 Issue: 17 Pages: 173202-173202

    • DOI

      10.1103/physrevlett.124.173202

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Threshold Photodetachment Spectroscopy of the Positronium Negative Ion2020

    • Author(s)
      Michishio Koji、Kuma Susumu、Nagata Yugo、Chiari Luca、Iizuka Taro、Mikami Riki、Azuma Toshiyuki、Nagashima Yasuyuki
    • Journal Title

      Physical Review Letters

      Volume: 125 Issue: 6 Pages: 063001-063001

    • DOI

      10.1103/physrevlett.125.063001

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer2019

    • Author(s)
      C. Malbrunot, M. Diermaier, M.C. Simon, C. Amsler, S. Arguedas Cuendis, H. Breuker, C. Evans, M. Fleck, B. Kolbinger, A. Lanz, M. Leali, V. Maeckel, V. Mascagna, O. Massiczek, Y. Matsuda, Y. Nagata, C. Sauerzopf , L. Venturelli, E. Widmann, M. Wiesinger, Y. Yamazaki and J. Zmeskal
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A

      Volume: 935 Pages: 110-120

    • DOI

      10.1016/j.nima.2019.04.060

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Detection of radiation torque exerted on an alkali-metal vapor cell2019

    • Author(s)
      Atsushi Hatakeyama , Runa Yasuda, Yutaka Goto, Natsumi Chikakiyo, Takahiro Kuroda, and Yugo Nagata
    • Journal Title

      AIP Advances

      Volume: 9 Issue: 7 Pages: 075002-075002

    • DOI

      10.1063/1.5097258

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 静的な回転周期場を用いた原子共鳴2022

    • Author(s)
      永田祐吾、長嶋泰之
    • Organizer
      日本物理学会、第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 静的な回転周期場による原子の共鳴遷移2021

    • Author(s)
      永田祐吾、長嶋泰之
    • Organizer
      原子衝突学会、第46回年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Hyperfine resonance of positronium using a static periodic magnetic field2021

    • Author(s)
      Y. Nagata, K. Michishio, T. Iizuka, H. Kikutani, L. Chiari, F. Tanaka and Y. Nagashima
    • Organizer
      PPC12.5, 12.5th International Workshop on Positron and Positronium Chemistry
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 静的な周期磁場を通過するポジトロニウムの超微細構造の共鳴遷移2021

    • Author(s)
      永田祐吾,満汐孝治,飯塚太郎,鞠谷温人,L. Chiari,田中文,長嶋泰之
    • Organizer
      低速陽電子実験施設研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] ポジトロニウム負イオンのしきい光脱離の赤外レーザー分光2021

    • Author(s)
      満汐孝治, 久間晋, 永田祐吾, Chiari Luca, 飯塚太郎, 三上力久, 東俊行, 長嶋泰之
    • Organizer
      低速陽電子実験施設研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] 運動誘起共鳴によるポジトロニウムの超微細構造共鳴遷移の周期数依存性2020

    • Author(s)
      永田祐吾,三上力久,長嶋泰之
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] ポジトロニウム負イオンのしきい光脱離分光実験2020

    • Author(s)
      満汐孝治, 久間晋, 永田祐吾, Chiari Luca, 飯塚太郎, 三上力久, 東俊行, 長嶋泰之
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 極低温タングステンからの低速ミュオン生成実験2020

    • Author(s)
      永田祐吾,有留翔一,神田聡太郎,門野良典,下村浩一郎,長嶋泰之
    • Organizer
      原子衝突学会第45回年会
    • Related Report
      2020 Research-status Report
  • [Presentation] ポジトロニウム干渉実験に向けたグラフェンの電子線回折スポットの加熱処理による尖鋭化2020

    • Author(s)
      三上力久,永田祐吾,長嶋泰之
    • Organizer
      原子衝突学会第45回年会
    • Related Report
      2020 Research-status Report
  • [Presentation] A monoenergetic energy-tunable positronium beam and its applications2019

    • Author(s)
      Y. Nagata, K. Michishio and Y. Nagashima
    • Organizer
      4th International Workshop on Models and Data for Plasma-Material Interaction in Fusion Devices
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hyperfine resonance of positronium atoms using a static periodic magnetic field2019

    • Author(s)
      Y. Nagata, K. Michishio, T. Iizuka, H. Kikutani, F. Tanaka, L. Chiari, Y. Nagashima
    • Organizer
      POSMOL 2019 (XX International Workshop on Low-Energy Positron and Positronium Physics XXI International Symposium on Electron-Molecule Collisions and Swarms)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Atomic resonance of the hyperfine structure of positronium using a multi-layered transmission magnetic grating2019

    • Author(s)
      Y. Nagata, K. Michishio, T. Iizuka, F. Tanaka, H. Kikutani, L. Chiari, Y. Nagashima
    • Organizer
      ICPEAC 2019 (XXXIst International Conference on Photonic, Electronic, and Atomic Collisions)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Applications of a high-brightness energy-tunable positronium beam produced using the photodetachment of positronium negative ions2019

    • Author(s)
      Y. Nagashima, K. Michishio, L. Chiari, Y. Nagata, F. Tanaka, T. Iizuka, H. Kikutani and K. Tokesi
    • Organizer
      ICPEAC 2019 (XXXIst International Conference on Photonic, Electronic, and Atomic Collisions)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Progress in the study of energy tunable Ps beams employing the Ps- photodetachment technique2019

    • Author(s)
      Y. Nagashima, K. Michishio, L. Chiari, Y. Nagata , H. Terabe , S. Iida , F. Tanaka , T. Iizuka , and N. Oshima
    • Organizer
      15th International Workshop on Slow Positron Beam Techniques and Applications (SLOPOS-15)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A novel high-brightness and energy-tunable positronium beam and future applications2019

    • Author(s)
      L. Chiari, K. Michishio, Y. Nagata, T. Iizuka, F. Tanaka, H. Kikutani and Y. Nagashima
    • Organizer
      15th International Workshop on Slow Positron Beam Techniques and Applications (SLOPOS-15)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 運動誘起共鳴によるポジトロニウムの超微細構造遷移の観測実験2019

    • Author(s)
      飯塚太郎,永田祐吾,満汐孝治,鞠谷温人,田中文,L. Chiari,長嶋泰之
    • Organizer
      原子衝突学会第44回年会
    • Related Report
      2019 Research-status Report
  • [Presentation] 静周期磁場によるポジトロニウム超微細構造の観測実験2019

    • Author(s)
      永田祐吾,飯塚太郎,満汐孝治,鞠谷温人,田中文,L. Chiari,長嶋泰之
    • Organizer
      日本物理学会「秋季大会」
    • Related Report
      2019 Research-status Report
  • [Presentation] sub-THz領域におけるポジトロニウムの運動誘起共鳴2019

    • Author(s)
      永田祐吾,満汐孝治, 飯塚太郎, 田中文,鞠谷温士,L. Chiari,大島永康, 長嶋泰之
    • Organizer
      京都大学原子炉実験所専門研究会「陽電子科学とその理工へ応用」
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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