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Development of an interferometer with laser cooled molecules to study the mechanism of anti-matter disappearance

Research Project

Project/Area Number 18K18762
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Sakemi Yasuhiro  東京大学, 大学院理学系研究科(理学部), 教授 (90251602)

Co-Investigator(Kenkyū-buntansha) 長濱 弘季  東京大学, 大学院理学系研究科(理学部), 助教 (00804072)
大前 宣昭  国立研究開発法人理化学研究所, 光量子工学研究センター, 研究員 (60615160)
田中 香津生  東北大学, サイクロトロン・ラジオアイソトープセンター, 助教 (20780860)
Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsレーザー冷却分子干渉計 / 永久電気双極子能率 / CP対称性 / 超対称性
Outline of Final Research Achievements

In order to investigate the origin of matter-antimatter symmetry (CP) violation, we focused on the fact that the permanent electric dipole moment (EDM) of unpaired electrons in the polar molecule is greatly enhanced by the intramolecular effective electric field and its relativistic effect. We performed the developments to realize the cold Fr-Sr molecules for the accurate EDM measurement. In particular, we have established a technique for a high-intensity laser-cooled Fr source by using the nuclear fusion reaction with a surface ionization ion source by a non-contact heating method with an infrared heater to produce Fr and the frequency stabilization with an iodine molecule and a high-precision wavemeter. Furthermore, by establishing a coexistence trapping technique for two types of Rb isotopes and evaluating the effective electric field inside Fr-Sr by relativistic coupled cluster theory, we have established a basic technique for Fr-Sr molecule EDM measurement.

Academic Significance and Societal Importance of the Research Achievements

分子内の有効電場が大きい極性分子において、電子EDMが格段に増幅されることを利用し、分子EDM研究が注目されている。しかし分子EDM測定は、ビーム実験のみであり、測定感度は外場との相互作用時間数ミリ秒程度に制限されている。今回、2種類の冷却原子を準備して、それらを会合することで、冷却分子を生成することを目指しており、長い相互作用時間を実現できるため、EDM測定精度の限界を打ち破ることが可能となり、学術的に重要と考えられる。さらに、生成するFr-221のgeneratorであるAc-225は、内包治療薬剤としても注目されていおり、この大強度Ac製造は社会的にも重要な意義を持つ。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (26 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (8 results) Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 5 results) Remarks (3 results) Funded Workshop (2 results)

  • [Int'l Joint Research] フローニンゲン大学(オランダ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ニース大学(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] フローニンゲン大学(オランダ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] フェラーラ大学(イタリア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] ニース大学(フランス)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] チューリッヒ工科大学(スイス)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] ブリティシュコロンビア大学(カナダ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] フローニンゲン大学(オランダ)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Fundamental physics with cold radioactive atoms2021

    • Author(s)
      Sakemi Y.、Aoki T.、Calabrese R.、Haba H.、Harada K.、Hayamizu T.、Ichikawa Y.、Jungmann K.、Kastberg A.、Kotaka Y.、Matsuda Y.、Matsuo Y.、Nagahama H.、Nakamura K.、Otsuka M.、Ozawa N.、Tanaka K. S.、Uchiyama A.、Ueno H.、Willmann L.
    • Journal Title

      AIP Conference Proceedings

      Volume: 2319 Pages: 080020-080020

    • DOI

      10.1063/5.0037134

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Analysis of an Optical Lattice Methodology for Detection of Atomic Parity Nonconservation2020

    • Author(s)
      Kastberg Anders、Sahoo Bijaya Kumar、Aoki Takatoshi、Sakemi Yasuhiro、Das Bhanu Pratap
    • Journal Title

      Symmetry

      Volume: 12 Issue: 6 Pages: 974-974

    • DOI

      10.3390/sym12060974

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Optical-lattice-based method for precise measurements of atomic parity violation2019

    • Author(s)
      Kastberg A.、Aoki T.、Sahoo B. K.、Sakemi Y.、Das B. P.
    • Journal Title

      Physical Review A

      Volume: 100 Issue: 5 Pages: 050101-050101

    • DOI

      10.1103/physreva.100.050101

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development of a Dual Isotope Co-Magnetometer Using Laser Cooled Rubidium Toward Electron Electric Dipole Moment Measurement Using Francium2019

    • Author(s)
      Uchiyama A、Harada K、Inoue T、Kawamura H、Tanaka K S、Itoh M、Aoki T、Hatakeyama A、Takahashi Y、Sakemi Y
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1206 Pages: 012008-012008

    • DOI

      10.1088/1742-6596/1206/1/012008

    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 冷却原子を用いた電子の電気双極子能率の探索2018

    • Author(s)
      酒見泰寛
    • Journal Title

      光学(一般社団法人・日本光学会)

      Volume: 47 Pages: 301-301

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 高効率フランシウム原子線のための吸着防止コーティング材の評価2021

    • Author(s)
      佐藤幹, 長濱弘季, 山根風樹, 中下輝士, 小澤直也, 田中香津生, 松田恭幸, 酒見泰寛
    • Organizer
      日本物理学会 第76回年次大会 14pA1-8 2021年3月14日
    • Related Report
      2020 Annual Research Report
  • [Presentation] フランシウム原子の電気双極子能率探索のための表面電離イオン源の開発2021

    • Author(s)
      小澤直也, 長濱弘季, 早水友洋, 中村圭佑, 佐藤幹, 永瀬慎太郎, 小高康照, 鎌倉恵太, 田中香津生, 大塚未来, 青木貴稔, 市川雄一, 高峰愛子, 羽場宏光, 上野秀樹, 酒見泰寛
    • Organizer
      日本物理学会 第76回年次大会 15pV1-12 2021年3月15日
    • Related Report
      2020 Annual Research Report
  • [Presentation] Development of ultracold francium atomic sources towards the permanent EDM search2021

    • Author(s)
      T. Hayamizu, H. Haba, K. Nakamura, T. Aoki, H. Nagahama, K. Tanaka, N. Ozawa, M. Ohtsuka, and Y. Sakemi,
    • Organizer
      Yamada Conference LXXII: The 8th Asia-Pacific Conference on Few-Body Problems in Physics (APFB2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fundamental physics with cold radioactive atoms2019

    • Author(s)
      Yasuhiro Sakemi
    • Organizer
      APPC14 (14th ASIA-PACIFIC PHYSICS CONFERENCE)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Fundamental physics with laser cooled atoms2019

    • Author(s)
      Yasuhiro Sakemi
    • Organizer
      36th Mazurian Lakes Conference on Physics(Probing fundamental laws of nature with exotic nuclei and atoms)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 光格子重元素干渉計による基本対称性の研究2019

    • Author(s)
      酒見泰寛
    • Organizer
      理研「物質階層原理&ヘテロ界面」研究報告会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Fundamental physics with laser cooled heavy elements2019

    • Author(s)
      酒見泰寛
    • Organizer
      2019重元素化学ワークショップ
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 人工RI結晶による基本対称性の研究2018

    • Author(s)
      酒見泰寛
    • Organizer
      研究会「超重元素研究の新展開」
    • Related Report
      2018 Research-status Report
    • Invited
  • [Remarks] 東京大学CNS基本対称性研究室

    • URL

      https://sites.google.com/cns.s.u-tokyo.ac.jp/fundamental-symmetry-group

    • Related Report
      2020 Annual Research Report
  • [Remarks] 東京大学原子核科学研究センター・基本対称性研究室

    • URL

      https://sites.google.com/cns.s.u-tokyo.ac.jp/fundamental-symmetry-group

    • Related Report
      2019 Research-status Report
  • [Remarks] 基本対称性: 東京大学原子核科学研究センター

    • URL

      http://www.cns.s.u-tokyo.ac.jp/index.php?Research%2FEDM

    • Related Report
      2018 Research-status Report
  • [Funded Workshop] 12th Fundamentl Physics Using Atoms (FPUA2020)2020

    • Related Report
      2019 Research-status Report
  • [Funded Workshop] 11th Fundamental Physics Using Atoms (FPUA2019)2019

    • Related Report
      2018 Research-status Report

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Published: 2018-07-25   Modified: 2022-01-27  

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