Presice Measurement of Muonium Hyperfine Structure in J-PARC

2016 Fiscal Year Final Research Report

• Project/Area Number: 26247046
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: SHIMOMURA Koichiro 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 准教授 (60242103)
• Co-Investigator(Renkei-kenkyūsha): MATSUDA Yasuyuki 東京大学, 総合文化研究科, 准教授 (70321817) ; TORII Horoyuki 東京大学, 総合文化研究科, 助教 (20302838) ; SASAKI Kenichi 大学共同利用機関法人高エネルギー加速器研究機構, 超伝導低温工学センター, 准教授 (70322831) ; MIBE Tsutomu 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, 准教授 (80536938) ; Toyoda Akihisa 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, 助教 (20373186) ; Kawamura Naritoshi 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 特別准教授 (60311338)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ミュオン / ミュオニウム / 超微細構造 / 精密磁場

Outline of Final Research Achievements

At the Muon Science Facility (MUSE) of J-PARC (Japan Proton Accelerator Research Complex), the MuSEUM collaboration is planing new measurements of the ground state hyperfine structure (HFS) of muonium both at zero field and at high magnetic field. The previous measurements were performed both at LAMPF (Los Alamos Meson Physics Facility) with experimental uncertainties mostly dominated by statistical errors. The new high intensity muon beam that will soon be available at MUSE H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. In FY 2016, we succeeded to oberve the resonance of muonium hyperfine structure at zero field.

Free Research Field

素粒子実験