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Direct measurement of the decay rate of parapositronium using high power milli-wave radiation source

Research Project

Project/Area Number 22340051
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionThe University of Tokyo

Principal Investigator

KOBAYASHI Tomio  東京大学, 素粒子物理国際研究センター, 教授 (50126059)

Co-Investigator(Kenkyū-buntansha) ASAI Shoji  東京大学, 大学院・理学系研究科, 准教授 (60282505)
Co-Investigator(Renkei-kenkyūsha) IDEHARA Toshitaka  福井大学, 遠赤外領域開発研究センター, 特任教授 (80020197)
NAMBA Toshio  東京大学, 素粒子物理国際研究センター, 助教 (40376702)
SUEHARA Taikan  東京大学, 素粒子物理国際研究センター, 特任研究員 (20508387)
Project Period (FY) 2010 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2011: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2010: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Keywords素粒子実験 / ミリ波 / ポジトロニウム / 超微細構造 / 量子電磁力学
Research Abstract

Positronium is a bound state of an electron and a positron. Two ground states, orthopositronium and parapositronium, have energy level difference called as the hyperfine structure. A high power milli-wave (203GHz) radiation source corresponding to the hyperfine structure is developed. With this source, the direct transition of positronium hyperfine splitting is observed for the first time. The observed event rate is in good agreement with the theoretical value. This source is improved to be tunable in frequency to measure the decay rate of parapositronium from the resonance width of the transition.

Report

(4 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • Research Products

    (44 results)

All 2013 2012 2011 2010 Other

All Journal Article (5 results) (of which Peer Reviewed: 4 results) Presentation (35 results) Remarks (4 results)

  • [Journal Article] Precise measurement of positronium2012

    • Author(s)
      Toshio Namba
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2012 Issue: 1

    • DOI

      10.1093/ptep/pts062

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation2012

    • Author(s)
      Takayuki Yamazaki
    • Journal Title

      Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

      Pages: 1-2

    • DOI

      10.1109/irmmw-thz.2012.6380416

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
  • [Journal Article] Direct Observation of the Hyperfine Transition of Ground-State Positronium2012

    • Author(s)
      Akira Miyazaki, (10名中2人目)
    • Journal Title

      Physical Review Letters

      Volume: 108 Issue: 25 Pages: 253401-253401

    • DOI

      10.1103/physrevlett.108.253401

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] First observation of o-Ps to p-Ps transition and first direct measurement of positronium hyperfine splitting with sub-THz light2011

    • Author(s)
      T.Yamazaki, A.Miyazaki, T.Suehara, T.Namba, S.Asai, T.Kobayashi, H.Saito, Y.Urushizaki, I.Ogawa, T.Idehara, S.Sabchevski
    • Journal Title

      Hyperfine Interaction

      Volume: (online first) Issue: 1-3 Pages: 141-147

    • DOI

      10.1007/s10751-011-0399-0

    • Related Report
      2012 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article]2010

    • Author(s)
      A. Miyazaki、T. Yamazaki、T. Suehara、 T. Namba、S. Asai、T. Kobayashi, H. Saito、T. Idehara、I. Ogawa、S. Sabchevski
    • Journal Title

      Materials Science Forum

      Volume: 666巻 Pages: 133-137

    • DOI

      10.4028/www.scientific.net/msf.666.133

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Presentation] DirectMeasurementofthe HyperfineTransitionofPositroniumusingHighPowerSub-THzRadiation2013

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-28
    • Related Report
      2012 Final Research Report
  • [Presentation] Sub-THz Spectroscopy of the Ground State Hyperfine Splitting of Positronium2013

    • Author(s)
      山崎高幸
    • Organizer
      International Symposium on Development of Terahertz Gyrotrons and Applications
    • Place of Presentation
      福井大学
    • Year and Date
      2013-03-14
    • Related Report
      2012 Final Research Report
  • [Presentation] The direct spectroscopy of positronium hyperfine structure using sub-THz gyrotron2012

    • Author(s)
      宮崎彬
    • Organizer
      International Symposium on Frontiers in THz Technology (FTT2012)
    • Place of Presentation
      東大寺総合文化センター
    • Year and Date
      2012-11-27
    • Related Report
      2012 Final Research Report
  • [Presentation] Direct measurement of the Hyperfine Structure of the Ground state Positronium using High Power sub-THz radiation2012

    • Author(s)
      山崎高幸
    • Organizer
      The 37th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
    • Place of Presentation
      豪州、 ウロンゴン大学
    • Year and Date
      2012-09-28
    • Related Report
      2012 Final Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定へ向けたミリ波デバイスの開発2012

    • Author(s)
      宮崎彬
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西学院大学(兵庫)
    • Year and Date
      2012-03-24
    • Related Report
      2011 Annual Research Report
  • [Presentation] ポジトロニウムにおける超微細構造間遷移の直接観測2012

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西学院大学(兵庫)
    • Year and Date
      2012-03-24
    • Related Report
      2011 Annual Research Report
  • [Presentation] Direct Measurement of the Hyperfine Structure of the Ground State Positronium using High PowerSub-THz Radiation2012

    • Author(s)
      山崎高幸
    • Organizer
      The 4th International Workshop on Far-Infrared Technologies 2012 (FIRT2012)
    • Place of Presentation
      福井大学遠赤外線センター
    • Year and Date
      2012-03-08
    • Related Report
      2012 Final Research Report
  • [Presentation] Direct Measurement of the Hyperfine Structure of the Ground State Positronium using High Power Sub-THz Radiation2012

    • Author(s)
      T.Yamazaki
    • Organizer
      The 4^<th> International Workshop on Far-Infrared Technologies 2012
    • Place of Presentation
      福井大学(福井)
    • Year and Date
      2012-03-08
    • Related Report
      2011 Annual Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定2011

    • Author(s)
      宮崎彬
    • Organizer
      陽電子科学とその理工学への影響
    • Place of Presentation
      京都大学原子炉実験所(大阪)
    • Year and Date
      2011-12-03
    • Related Report
      2011 Annual Research Report
  • [Presentation] The First Observation of Direct Transition between o-Ps and p-Ps by sub-THz Radiation2011

    • Author(s)
      末原大幹
    • Organizer
      ColdAntimatter and High Precision Physics2011 (Pbar11)
    • Place of Presentation
      島根県立産業交流会館
    • Year and Date
      2011-11-29
    • Related Report
      2012 Final Research Report
  • [Presentation] The First Observation of Direct Transition between o-Ps and p-Ps by sub-THz Radiation2011

    • Author(s)
      T.Suehara
    • Organizer
      Cold Antimatter and High Precision Physics 2011
    • Place of Presentation
      島根県立産業交流会館(島根)
    • Year and Date
      2011-11-29
    • Related Report
      2011 Annual Research Report
  • [Presentation] Direct Measurement of Positronium Hyperfine Splitting2011

    • Author(s)
      宮崎彬
    • Organizer
      36th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2011)
    • Place of Presentation
      米国、ヒューストン
    • Year and Date
      2011-10-07
    • Related Report
      2012 Final Research Report
  • [Presentation] Direct Measurement of Positronium Hyperfine Splitting2011

    • Author(s)
      A.Miyazaki
    • Organizer
      36^<th> International Conference on Infrared, Millimeter, and Terahertz Waves
    • Place of Presentation
      Houston(アメリカ)
    • Year and Date
      2011-10-07
    • Related Report
      2011 Annual Research Report
  • [Presentation] サブテラヘルツ波を用いたポジトロニウム超微細構造の直接測定2011

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      弘前大学(青森)
    • Year and Date
      2011-09-18
    • Related Report
      2011 Annual Research Report
  • [Presentation] サブミリ波を用いたポジトロニウム超微細構造の直接測定2011

    • Author(s)
      末原大幹
    • Organizer
      第48回アイソトープ・放射線研究会
    • Place of Presentation
      日本科学未来館(東京)
    • Year and Date
      2011-07-08
    • Related Report
      2011 Annual Research Report
  • [Presentation] First Direct Measurement of Hyperfine Splitting of Positronium using sub-THz light2011

    • Author(s)
      山崎高幸
    • Organizer
      10th International Conference on Low Energy Antiproton Physics (LEAP2011)
    • Place of Presentation
      TRIUMF、カナダ
    • Year and Date
      2011-04-27
    • Related Report
      2012 Final Research Report
  • [Presentation] First Direct Measurement of Hyperfine Splitting of Positronium using Sub-THz light2011

    • Author(s)
      T.Yamazaki
    • Organizer
      10^<th> International Conference on Low Energy Antiproton Physics
    • Place of Presentation
      TRIUMF(カナダ)
    • Year and Date
      2011-04-27
    • Related Report
      2011 Annual Research Report
  • [Presentation] サブテラヘルツ波を用いたポジトロニウムの超微細構造の直接測定2010

    • Author(s)
      山崎高幸
    • Organizer
      陽電子科学とその理工学への応用
    • Place of Presentation
      京都大学原子炉実験所
    • Year and Date
      2010-11-27
    • Related Report
      2010 Annual Research Report
  • [Presentation] サブテラヘルツ波を用いたポジトロニウムの超微細構造の測定I(光学系)2010

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      九州工業大学
    • Year and Date
      2010-09-14
    • Related Report
      2010 Annual Research Report
  • [Presentation] サブテラヘルツ波を用いたポジトロニウムの超微細構造の測定II(検出器系)2010

    • Author(s)
      宮崎彬
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      九州工業大学
    • Year and Date
      2010-09-14
    • Related Report
      2010 Annual Research Report
  • [Presentation] Positronium Hyperfine Splitting2010

    • Author(s)
      宮崎彬
    • Organizer
      International School of Subnuclear Physics
    • Place of Presentation
      イタリア、Erice
    • Year and Date
      2010-08-04
    • Related Report
      2010 Annual Research Report
  • [Presentation] サブテラヘルツ波を用いたポジトロニウム超微細構造の測定2010

    • Author(s)
      山崎高幸
    • Organizer
      第47回アイソトープ・放射線研究発表会
    • Place of Presentation
      東京、日本科学未来館
    • Year and Date
      2010-07-08
    • Related Report
      2010 Annual Research Report
  • [Presentation] New Experiment for the First Direct Measurement of Positronium Hyperfine Splitting with sub-THz light2010

    • Author(s)
      宮崎彬
    • Organizer
      39th Polish Seminar on Positron Annihilation (PSPA10)
    • Place of Presentation
      カジメルツドルニー、ポーランド
    • Year and Date
      2010-06-23
    • Related Report
      2012 Final Research Report
  • [Presentation] New Experiment for the First Direct Measurement of Positronium Hyperfine Splitting with sub-THz light2010

    • Author(s)
      宮崎彬
    • Organizer
      39^<th> Polish Seminar on Positron Annihilation
    • Place of Presentation
      ポーランド、Kazimerz Dolny
    • Year and Date
      2010-06-23
    • Related Report
      2010 Annual Research Report
  • [Presentation] Positronium Hyperfine Splitting2010

    • Author(s)
      宮崎彬
    • Organizer
      International School of Subnuclear physics 2010
    • Place of Presentation
      エリーチェ、イタリア
    • Related Report
      2012 Final Research Report
  • [Presentation] The sub-THz direct spectroscopy of positronium hyperfine splitting

    • Author(s)
      宮崎彬
    • Organizer
      16th International Conference on Positron Annhilation (ICPA-16)
    • Place of Presentation
      英国、ブリストル大学
    • Related Report
      2012 Final Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定

    • Author(s)
      宮崎彬
    • Organizer
      第49回アイソトープ・放射線研究発表会
    • Place of Presentation
      東京大学(東京都)
    • Related Report
      2012 Annual Research Report
  • [Presentation] The sub-THz direct spectroscopy of positronium hyperfine splitting

    • Author(s)
      宮崎彬
    • Organizer
      16th International Conference on Positron Annihilation (ICPA-16)
    • Place of Presentation
      ブリストル大学(英国)
    • Related Report
      2012 Annual Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定 I

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      京都産業大学(京都府)
    • Related Report
      2012 Annual Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定 II (ミリ波共振器)

    • Author(s)
      宮崎彬
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      京都産業大学(京都府)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Direct measurement of the Hyperfine Structure of the Ground state Positronium using High Power sub-THz radiation

    • Author(s)
      山崎高幸
    • Organizer
      The 37th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
    • Place of Presentation
      ウロンゴン大学(豪州)
    • Related Report
      2012 Annual Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定の現状

    • Author(s)
      宮崎彬
    • Organizer
      陽電子科学とその理工学への影響
    • Place of Presentation
      京都大学原子炉実験所(大阪府)
    • Related Report
      2012 Annual Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定 I (概要と光学系)

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学(広島県)
    • Related Report
      2012 Annual Research Report
  • [Presentation] ポジトロニウム超微細構造の直接測定 II (測定の経過)

    • Author(s)
      宮崎彬
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学(広島県)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Direct Measurement of the Hyperfine Transition of Positronium using High Power Sub-THz Radiation

    • Author(s)
      山崎高幸
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学(広島県)
    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://tabletop.icepp.s.u-tokyo.ac.jp/

    • Related Report
      2012 Final Research Report
  • [Remarks] Tabletop Experiments

    • URL

      http://tabletop.icepp.s.u-tokyo.ac.jp

    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://tabletop.icepp.s.u-tokyo.ac.jp/

    • Related Report
      2011 Annual Research Report
  • [Remarks]

    • URL

      http://tabletop.icepp.s.u-tokyo.ac.jp/

    • Related Report
      2010 Annual Research Report

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Published: 2010-08-23   Modified: 2019-07-29  

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