Development of aerogels as high-yield muonium production/emission targets

• Project/Area Number: 17K05466
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization (2018-2020); Nagoya University (2017)
• Principal Investigator: Suzuki Kazuhito 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究員 (30547534)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: ミューオニウム / エアロゲル / 素粒子実験 / 原子・分子物理 / 合成化学

Outline of Final Research Achievements

Muon is one of the elementary particles and is an important prove for new phenomena in the researches of elementary particle physics as well as condensed matter physics. To generate a high-quality muon beam, an innovative muon cooling technique is necessary. The high-formation/emission targets of muonium, an atom that consists of a positive-charge muon and electron, developed in this research is an important component of such an innovative cooling technique. The obtained results would promote various international state-of-arts researches that use muons and muonium atoms, such as the precision measurement of the muon anomalous magnetic moment which is one of the experiments we expect to observe new physics phenomena beyond the standard model of elementary particle physics.

Academic Significance and Societal Importance of the Research Achievements

ミュー粒子はパイ中間子の崩壊で生成され、パイ中間子は陽子と原子核の相互作用で生成されるため、とり得る位置と運動量の領域（「エミッタンス」）が広がっており、電子や陽子などの安定粒子と比べて短い寿命と相まって、ビームとしての取り扱いが困難である。本研究成果を用いてミュー粒子を室温程度の熱エネルギーまで冷却することで、エミッタンスの小さい高品質のミュー粒子ビームが生成でき、素粒子特性の超精密精密測定における探針として、また物性における細密構造解析における探針として、様々な最先端研究での利用が期待される。冷却されたミューオニウム（正ミュー粒子と電子から成る原子状態）自身も、理論の精密検証に利用できる。

Research Products

• [Int'l Joint Research] TRIUMF/The University of British Columbia/University of Victoria(カナダ)
• [Int'l Joint Research] TRIUMF/The University of British Columbia/University of Victoria(カナダ)
• [Int'l Joint Research] TRIUMF/The University of British Columbia/University of Victoria(カナダ)
• [Int'l Joint Research] TRIUMF/The University of British Columbia/University of Victoria(Canada)
• [Journal Article] Study of muonium emission from laser-ablated silica aerogel (2020)
  • Author(s): J. Beare, G. Beer, J.H. Brewer, T. Iijima, K. Ishida, M. Iwasaki, S. Kamal, K. Kanamori, N. Kawamura, R. Kitamura, S. Li, G.M. Luke, G.M. Marshall, T. Mibe, Y. Miyake, Y. Oishi, K. Olchanski, A. Olin, M. Otani, M.A. Rehman, N. Saito, Y. Sato, K. Shimomura, K. Suzuki,*, M. Tabata, and H. Yasuda
  • Journal Title: Prog. Theor. Exp. Phys Volume: 2020 Issue: 12
  • DOI: 10.1093/ptep/ptaa145
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] The status and prospect of the muon g-2/EDM experiment at J-PARC (2019)
  • Author(s): Kazuhito Suzuki
  • Organizer: Anomalies 2019
  • Int'l Joint Research / Invited
• [Presentation] Development of the muonium production target for the muon g-2/EDM experiment at J-PARC (2019)
  • Author(s): Kazuhito Suzuki
  • Organizer: J-PARC Symposium 2019
  • Int'l Joint Research
• [Presentation] J-PARC muon g-2/EDM experiment (2019)
  • Author(s): Kazuhito Suzuki
  • Organizer: New Developments of Muon Precesion Physics
  • Int'l Joint Research / Invited
• [Presentation] J-PARC Muon g-2/EDM Experiment (2019)
  • Author(s): 鈴木一仁
  • Organizer: 第9回 Muon科学と加速器研究
• [Presentation] J-PARCミューオンg-2/EDM実験のためのレーザー加工したシリカエアロゲル標的からのミューオニウム放出の研究 (2018)
  • Author(s): 鈴木一仁
  • Organizer: 日本物理学会 2018年秋季大会
• [Presentation] Development of the Muonium Production Target for the J-PARC muon g-2/EDM experiment (2018)
  • Author(s): Kazuhito Suzuki
  • Organizer: Physics of muonium and related topics
  • Int'l Joint Research
• [Presentation] Development of the Muonium Production Target for the Ultra-cold Muon Beam (2018)
  • Author(s): Kazuhito Suzuki
  • Organizer: Mini-workshop on monium and muonic hydrogen laser spectroscopy
  • Int'l Joint Research
• [Presentation] Development of the Target for Muoniuum Production at Room Temperature (2018)
  • Author(s): Kazuhito Suzuki
  • Organizer: 第8回 Muon科学と加速器研究
• [Presentation] J-PARC muon g-2/EDM experiment: 2017 experiment result of muonium emission from laser-ablated silica aerogel (2018)
  • Author(s): Sirui Li
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Optimization of thermal muonium yield from silica aerogel with laser-ablated holes for muon g-2/EDM experiment at J-PARC (2017)
  • Author(s): Sirui Li
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] Studies on muonium emission from laser-ablated silica aerogel targets for the polarized, ultra-cold muon source of the muon g-2/EDM experiment at J-PARC (2017)
  • Author(s): Kazuhito Suzuki
  • Organizer: 2017 International Workshop on Polarized Sources, Targets, and Polarimetry
  • Int'l Joint Research
• [Remarks] 東大齊藤研究室/総研大ミューオン精密測定研究室: TRIUMFにおけるミューオニウム生成実験
  • URL: http://g-2.kek.jp/gakusai/