Study for the violation mechanism of fundamental symmetry using the cold atom/molecular interferometer with optical lattice

• Project/Area Number: 19H05601
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Review Section: Broad Section B
• Research Institution: The University of Tokyo
• Principal Investigator: 酒見 泰寛 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) ; 青木 貴稔 東京大学, 大学院総合文化研究科, 助教 (30328562) ; 羽場 宏光 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 室長 (60360624) ; 高峰 愛子 国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (10462699) ; 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, リサーチフェロー (20780860)
• Project Period (FY): 2019-06-26 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥200,460,000 (Direct Cost: ¥154,200,000、Indirect Cost: ¥46,260,000); Fiscal Year 2023: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000); Fiscal Year 2022: ¥31,330,000 (Direct Cost: ¥24,100,000、Indirect Cost: ¥7,230,000); Fiscal Year 2021: ¥46,020,000 (Direct Cost: ¥35,400,000、Indirect Cost: ¥10,620,000); Fiscal Year 2020: ¥57,200,000 (Direct Cost: ¥44,000,000、Indirect Cost: ¥13,200,000); Fiscal Year 2019: ¥48,880,000 (Direct Cost: ¥37,600,000、Indirect Cost: ¥11,280,000)
• Keywords: 基本対称性 / 電気双極子能率 / バリオン生成 / 光格子重元素干渉計 / レーザー冷却分子 / 電子双極子能率 / 基本対手性

Outline of Research at the Start

ヒッグス粒子の発見によって、物質の質量獲得機構をはじめ、素粒子物理学は大きく発展した。しかし物質・反物質対称性（CP対称性）破れの機構は十分には説明できず、根源的な枠組みが必要となっている。素粒子の階層問題、ゲージ結合定数の統一、暗黒物質の実体等を解決する有力な考え方では、未知の粒子と対称性の存在が示唆されている。本研究では、未知粒子が生成・伝搬・消滅を繰り返す量子補正効果により、素粒子に発現する永久電気双極子能率（EDM）の検出を目指す。この量子補正効果は極めて小さいが、素粒子を構成要素にもつ原子・分子を量子制御し、光格子干渉計によるEDMの精密量子計測を実現してCP対称性破れの起源を探る。

Outline of Annual Research Achievements

本研究により、レーザー冷却RIを用いた次世代EDM探索技術を開発し、目標である電子EDM測定感度10の-29乗ecmを実現する技術を確立した。中間評価では、磁気光学トラップから開放された冷却原子集団のラムゼー共鳴によるEDM測定手法により、相互作用時間が短く（10 ミリ秒程度）、測定精度は10の-27乗ecmと評価された。その後、長時間の相互作用時間（１秒程度）を実現する光格子形成のための高強度レーザー光源の開発に成功した。この実現によりEDM測定精度を一桁向上させ、10の-28乗ecmの探索技術を確立した。現在、規制庁による理研・加速器施設におけるアルファエミッター・Frの取り扱い数量の放射線管理変更の認可が遅延しているため、この境界条件におけるFr収量により測定精度が限定されているが、許可後はビーム強度を0.5puAから５puA（10倍）、225Ac/221Frの取り扱い数量も10倍が可能となり、当初目標の10の-29乗ecm達成が確実となる。また、偽EDM信号となる系統誤差の支配的な要因であるゼーマンシフトと光ベクトルシフトに関して、Frとともに、電子EDMの寄与がゼロとみなせる軽いアルカリ原子：Rb/Csを光格子中に同時にトラップし、それらのスピン歳差周期をオンラインで測定することで、各原子系のエネルギーシフトをモニターする共存磁力計の開発を行った。さらに、量子もつれの状態を用いたEDM量子計測技術により、10-31cmの精度を得ることを示し、本計画の目標を超えることを示した。

Research Progress Status

令和5年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和5年度が最終年度であるため、記入しない。

Assessment Rating

Interim Assessment Comments (Rating)

A: In light of the aim of introducing the research area into the research categories, the expected progress has been made in research.

Research Products

• [Int'l Joint Research] チューリッヒ工科大学/PSI研究所(スイス)
• [Int'l Joint Research] フローニンゲン大学(オランダ)
• [Int'l Joint Research] フェラーラ大学(イタリア)
• [Int'l Joint Research] ENSI-Caen/コートダジュール大学(フランス)
• [Int'l Joint Research] ブリティシュ・コロンビア大学(カナダ)
• [Int'l Joint Research] ニース大学/ENSI-Caen(フランス)
• [Int'l Joint Research] チューリッヒ工科大学(スイス)
• [Int'l Joint Research] ブリティシュコロンビア大学(カナダ)
• [Int'l Joint Research] Physical Research Laboratory(インド)
• [Int'l Joint Research] ニース大学(フランス)
• [Int'l Joint Research] チューリッヒ工科大学(スイス)
• [Int'l Joint Research] Physical Research Laboratory(インド)
• [Int'l Joint Research] チューリッヒ工科大学(スイス)
• [Int'l Joint Research] ニース大学(フランス)
• [Int'l Joint Research] Physical Research Laboratory(インド)
• [Int'l Joint Research] フローニンゲン大学(オランダ)
• [Int'l Joint Research] フローニンゲン大学(オランダ)
• [Int'l Joint Research] フェラーラ大学(イタリア)
• [Int'l Joint Research] ENSI-Caen/ニース大学(フランス)
• [Int'l Joint Research] Physical Research Laboratory(インド)
• [Int'l Joint Research] チューリッヒ工科大学/ポール・シェーラー研究所(スイス)
• [Journal Article] Conception, modelling, and characterization of a fiber amplifier with a simple and easy-to-repair configuration intended for the use in harsh environments (2024)
  • Author(s): Ozawa Naoya、Nakamura Keisuke、Sakemi Yasuhiro
  • Journal Title: EPJ Techniques and Instrumentation Volume: 11 Issue: 1 Pages: 3-3
  • DOI: 10.1140/epjti/s40485-024-00111-1
  • Peer Reviewed / Open Access
• [Journal Article] Francium ion source with novel methods of target heating and beam characterization (2023)
  • Author(s): Ozawa N.、Nagahama H.、Sakemi Y.
  • Journal Title: Review of Scientific Instruments Volume: 94 Issue: 2 Pages: 023306-023306
  • DOI: 10.1063/5.0118754
  • Peer Reviewed
• [Journal Article] Development of Pepper-pot Emittance Monitor for High-intensity Ion Beam Accelerated by RIKEN AVF Cyclotron (2023)
  • Author(s): Y.Kotaka, Y.Sakemi et al.
  • Journal Title: Proc. IBIC’23 Volume: 1 Pages: 339-342
  • Peer Reviewed
• [Journal Article] 400-m-Long Polarization-Maintaining Fibers for Magneto-Optical Trapping of Francium Atoms (2022)
  • Author(s): Keisuke Nakamura, Shintaro Nagase, Teruhito Nakashita, Tomohiro Hayamizu, Takatoshi Aoki, Hiroki Nagahama, Naoya Ozawa, Motoki Sato, Kazeki Yamane, Mirai Fukase, Daisuke Uehara, Aiko Takamine, and Yasuhiro Sakemi
  • Journal Title: Proceedings of the 2022 Conference on Lasers and Electro-Optics Pacific Rim Volume: - Pages: 1-2
  • Peer Reviewed
• [Journal Article] Development of Neutralization Apparatus and Francium Source for the Francium Electric Dipole Moment Search (2022)
  • Author(s): Sato Motoki、Yamane Kazeki、Nagahama Hiroki、Ozawa Naoya、Nagase Shintaro、Nakashita Teruhito、Uehara Daisuke、Fukase Mirai、Nakamura Keisuke、Hayamizu Tomohiro、Haba Hiromitsu、Sakemi Yasuhiro、Matsuda Yasuyuki
  • Journal Title: JPS Conf. Proc. Volume: 37 Pages: 20605-20605
  • DOI: 10.7566/jpscp.37.020605
  • Peer Reviewed
• [Journal Article] Development of a Laser Frequency Stabilization and an Optical Transmission System for the Francium Electric Dipole Moment Search (2022)
  • Author(s): K. Nakamura, S. Nagase, T. Nakashita, T. Hayamizu, T. Aoki, H. Nagahama, N. Ozawa, M. Sato, K. Yamane, M. Fukase, D. Uehara, A. Takamine and Y. Sakemi
  • Journal Title: Journal of Physics: Conference Series Volume: 2249 Issue: 1 Pages: 0120101-7
  • DOI: 10.1088/1742-6596/2249/1/012010
  • Peer Reviewed / Open Access
• [Journal Article] An accelerator experiment for junior and senior high school students to improve students’ involvement in fundamental physics (2022)
  • Author(s): Tanaka K S、Harada K、Hayamizu T、Kita R、Kono R、Maruta K、Nagahama H、Ozawa N、Sakemi Y、Sugimori R
  • Journal Title: Physics Education Volume: 57 Issue: 4 Pages: 045013-045013
  • DOI: 10.1088/1361-6552/ac510a
  • Peer Reviewed
• [Journal Article] 量子エンタングル Fr 原子を用いた電子 EDM の量子センシング (2022)
  • Author(s): 青木貴稔 et al.
  • Journal Title: ECT （電気学会・電子回路研究会） Volume: 22-043 Pages: 1-6
  • Peer Reviewed
• [Journal Article] Towards CP Violation Studies on Superheavy Molecules: Theoretical and Experimental Perspectives (2021)
  • Author(s): Mitra R.、Prasannaa V. S.、Ruiz R. F. Garcia、Sato T. K.、Abe M.、Sakemi Y.、Das B. P.、Sahoo B. K.
  • Journal Title: Physical Review A Volume: 104 Issue: 6 Pages: 062801-062801
  • DOI: 10.1103/physreva.104.062801
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of Ultracold Francium Atomic Sources Towards the Permanent EDM Search. (2021)
  • Author(s): Hayamizu, T., et al.
  • Journal Title: Few-Body Syst. Volume: 63 Issue: 1 Pages: 11-11
  • DOI: 10.1007/s00601-021-01710-4
  • Peer Reviewed / Open Access
• [Journal Article] Two-dimensional beam profile monitor for the detection of alpha-emitting radioactive isotope beam (2021)
  • Author(s): Tanaka K.S.、Dammalapati U.、Harada K.、Hayamizu T.、Itoh M.、Kawamura H.、Nagahama H.、Nakamura K.、Ozawa N.、Sakemi Y.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Volume: 1017 Pages: 165803-165803
  • DOI: 10.1016/j.nima.2021.165803
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fundamental Physics with Cooled Radioactive Atoms (2021)
  • Author(s): Sakemi Yasuhiro、Harada Ken-ichi、Itoh Masatoshi、Ito Saki、Uchiyama Aiko、Inoue Takeshi、Kawamura Hirokazu、Aoki Takatoshi、Hatakeyama Atsushi、Takahashi Yoshiro、Hisano Junji
  • Journal Title: JPS Conf. Proc. Volume: 35 Pages: 011016-011016
  • DOI: 10.7566/jpscp.35.011016
  • Peer Reviewed
• [Journal Article] Fundamental physics with cold radioactive atoms (2021)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quantum sensing of the electron electric dipole moment using ultracold entangled Fr atoms (2021)
  • Author(s): Aoki T、Sreekantham R、Sahoo B K、Arora Bindiya、Kastberg A、Takamine A、Ueno H、Ichikawa Y、Matsuda Y、Haba H、Sakemi Y et al.
  • Journal Title: Quantum Science and Technology Volume: 6 Issue: 4 Pages: 044008-044008
  • DOI: 10.1088/2058-9565/ac1b6a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Analysis of an Optical Lattice Methodology for Detection of Atomic Parity Nonconservation (2020)
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Two-dimensional Beam Profile Monitor for Alpha Emitter (2019)
  • Author(s): Kazuo Tanaka, Kenichi Harada, Tomohiro Hayamizu, Masatoshi Itoh, Hirokazu Kawamura, Hiroki Nagahama, Naoya Ozawa, Yasuhiro Sakemi, Atsuki Terakawa, Aiko Uchiyama
  • Journal Title: IBIC Volume: 2019 Pages: 355-357
  • Peer Reviewed
• [Journal Article] Development of the Calculation Method of Injection Beam Trajectory of RIKEN AVF Cyclotron with 4D Emittance Measured by the Developed Pepper-Pot Emittance Monitor (2019)
  • Author(s): Yasuteru Kotaka, Akira Goto, Kichiji Hatanaka, Nobuaki Imai, Masayuki Kase, Hideshi Muto, Takashi Nagatomo, Takahide Nakagawa, Jun-ichi Ohnishi, Yukimitsu Ohshiro, Yasuhiro Sakemi, Susumu Shimoura, Hidetoshi Yamaguchi,
  • Journal Title: IBIC Volume: 2019 Pages: 351-354
  • Peer Reviewed
• [Journal Article] Optical-lattice-based method for precise measurements of atomic parity violation (2019)
  • 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
  • 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 Francium (2019)
  • 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
  • Peer Reviewed / Open Access
• [Presentation] Fundamental Physics with Cold Radioactive Heavy Elements (2023)
  • Author(s): Y.Sakemi
  • Organizer: Sixth Joint meeting of the nuclear physics divisions of the APS and JPS
  • Int'l Joint Research / Invited
• [Presentation] Production of radioisotopes for application studies at RIKEN RI Beam Factory; Search for new elements through diagnosis and therapy of cancer (2023)
  • Author(s): H.Haba
  • Organizer: The Fifth International Conference on Application of RadiotraCers and Energetic Beams in Sciences (ARCEBS 2023)
  • Int'l Joint Research / Invited
• [Presentation] 永久電気双極子能率探索を目指した冷却フランシウム原子源の開発 (2023)
  • Author(s): 小澤直也
  • Organizer: 日本物理学会・春季大会
• [Presentation] フランシウム原子の永久電気双極子能率探索に向けた高周波二重極質量フィルターの開発 (2023)
  • Author(s): 深瀬実来
  • Organizer: 日本物理学会・春季大会
• [Presentation] レーザー冷却フランシウム源実現に向けた金属表面における中性脱離反応の研究 (2023)
  • Author(s): 上原大祐
  • Organizer: 日本物理学会・春季大会
• [Presentation] 400-m-Long Polarization-Maintaining Fibers for Magneto-Optical Trapping of Francium Atoms (2022)
  • Author(s): K.Nakamura, Y.sakemi et al.
  • Organizer: The 15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2022)
  • Int'l Joint Research
• [Presentation] Search for permanent EDM by using Fr atoms (2022)
  • Author(s): M.Sato, Y.Sakemi et al.
  • Organizer: RCNP研究会「中性子と原始で探る基礎物理」
  • Invited
• [Presentation] Searching for the permanent electric dipole moment using laser cooled francium atoms (2022)
  • Author(s): H.Nagahama et al.
  • Organizer: PSI2022
  • Int'l Joint Research / Invited
• [Presentation] Development of a novel comagnetometer for high precision measurement of the electric dipole moment using laser cooled Fr atoms (2022)
  • Author(s): S. Nagase, Y.sakemi et al.
  • Organizer: PSI2022
  • Int'l Joint Research
• [Presentation] Search for permanent EDM by using Fr atom (2022)
  • Author(s): M.Fukase, Y.Sakemi et al.
  • Organizer: FPUA2022
  • Int'l Joint Research / Invited
• [Presentation] Development of a laser frequency stabilization andnan optical transmission system for the francium electric dipole moment search (2021)
  • Author(s): K.Nakamura, Y.Sakemi et al.
  • Organizer: 29th Annual International Laser Physics Workshop (LPHYS'21)
  • Int'l Joint Research
• [Presentation] Current status of the electron EDM search using laser-cooled francium atoms (2021)
  • Author(s): N.Ozawa, Y.Sakemi et al.
  • Organizer: 13th International Workshop on Fundamental Physics Using Atoms (FPUA2021)
  • Int'l Joint Research / Invited
• [Presentation] フランシウム原子の 電子電気双極子能率探索のための レーザー周波数安定化機構と光伝送系の開発 (2021)
  • Author(s): K,Nakamura, Y.Sakemi et al.
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] Search for permanent EDM by using Fr atoms (2021)
  • Author(s): M.Sato, Y.Sakemi et al.
  • Organizer: SPIN2021
  • Int'l Joint Research / Invited
• [Presentation] 原子の電気双極子能率 探索に向けたレーザー冷却 フランシウム源の開発 (2021)
  • Author(s): S.Nagase, Y.Sakemi et a;.
  • Organizer: 第77回日本物理学会年次大会
• [Presentation] フランシウムの電気双極子能率探索に向けた 冷却原子制御系開発 (2021)
  • Author(s): T.Nakashita, Y.Sakemi et al.
  • Organizer: 第77回日本物理学会年次大会
• [Presentation] 永久電気双極子能率探索に向けたアクチニウム-225電着基板を用いたフランシウム-221原子線源の開発 (2021)
  • Author(s): K.Yamane, Y.Sakemi et al.
  • Organizer: 第77回日本物理学会年次大会
• [Presentation] Development of ultracold francium atomic sources towards the permanent EDM search (2021)
  • Author(s): T. Hayamizu
  • Organizer: Yamada Conference LXXII: The 8th Asia-Pacific Conference on Few-Body Problems in Physics (APFB2020)
  • Int'l Joint Research
• [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
  • Organizer: 重元素核化学ワークショップ (ELPH研究会 C027)
• [Presentation] Development of a laser frequency stabilization and an optical transmission system for the francium electric dipole moment search (2021)
  • Author(s): 中村圭佑
  • Organizer: 29th Annual International Laser Physics Workshop (LPHYS'21)
  • Int'l Joint Research
• [Presentation] Present status of the electron EDM search using laser-cooled francium¶ (2021)
  • Author(s): 小澤直也
  • Organizer: 13th International Workshop on Fundamental Physics Using Atoms (FPUA2021)
  • Int'l Joint Research / Invited
• [Presentation] Fundamental physics with cold radioactive atoms (2019)
  • Author(s): 酒見泰寛
  • Organizer: APPC14 (14th ASIA-PACIFIC PHYSICS CONFERENCE) マレーシア
  • Int'l Joint Research / Invited
• [Presentation] Fundamental physics with laser cooled atoms (2019)
  • Author(s): 酒見泰寛
  • Organizer: 36th Mazurian Lakes Conference on Physics(Probing fundamental laws of nature with exotic nuclei and atoms)、ポーランド
  • Int'l Joint Research / Invited
• [Presentation] ラジオアイソトープの製造と応用－新元素の探索からがんの診断・治療まで－ (2019)
  • Author(s): 羽場宏光
  • Organizer: 019年度日本アイソトープ協会シンポジウム「PET・イメージング研究の最前線～ライフサイエンスと理工学の融合～
  • Invited
• [Presentation] 12.RI production - Chemistry of new elements to diagnosis and treatment of cancer (2019)
  • Author(s): 羽場宏光
  • Organizer: Tsukuba Conference 2019
  • Int'l Joint Research / Invited
• [Presentation] Production and Applications of Radioisotopes at RIKEN RI Beam Factory (2019)
  • Author(s): 羽場宏光
  • Organizer: SHE Science Symposium、米国
  • Int'l Joint Research / Invited
• [Presentation] レーザー冷却重元素による基礎物理 (2019)
  • Author(s): 酒見泰寛
  • Organizer: 第58回核化学夏の学校
  • Invited
• [Presentation] Two-dimensional beam profile monitor for alpha emitter (2019)
  • Author(s): 田中香津生
  • Organizer: 8th International Beam Instrumentation Conference、スウェーデン、ポスター
  • Int'l Joint Research
• [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
• [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
• [Remarks] 東京大学CNS基本対称性研究室
• [Funded Workshop] Fundamental Physics Using Atoms (FPUA2023) (2024)
• [Funded Workshop] The 14th international workshop on fundamental physics uing atoms (FPUA2022) (2022)
• [Funded Workshop] The international workshop on Atomic Partty Violation (APV2022) (2022)
• [Funded Workshop] The 13th international workshop on fundamental physics uing atoms (FPUA2021) (2021)
• [Funded Workshop] 13th International Workshop on Fundamental Physics Using Atoms (FPUA2021) (2021)
• [Funded Workshop] Fundamental Physics using Atoms (FPUA2019) (2020)