New precise spectroscopy of the hyperfine structure in muonium with a high-intensity pulsed muon beam

Physics Letters B

Y. Fukao¹  H.A. Torii²  S. Seo²  M. Iwasaki²  S. Nishimura²  Y. Sato³  K. Ishida³  Y. Miyake³  N. Kawamura³  T. Tanaka³  Y. Ueno³  K. Shimomura⁴  P. Strasser⁵  D. Kawall⁶  N. Saito⁶  A. Toyoda⁶  T. Mibe⁶  K.S. Tanaka⁷  Y. Ikedo⁷  N. Kurosawa⁸  S. Kanda⁸  K.M. Kojima⁸  Y. Matsuda⁹ 

[1] Corresponding author.;Graduate University of Advanced Studies (SOKENDAI), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;Japan Proton Accelerator Research Complex (J-PARC), 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan;Cryogenic Science Center, KEK, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan;Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan;Institute of Materials Structure Science, KEK 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan;Institute of Particle and Nuclear Studies, KEK, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan;RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;University of Massachusetts Amherst, 1126 Lederle Graduate Research Tower, Amherst, MA 01003-9337, USA;

关键词: Muon;    Muonium;    Hyperfine structure (HFS);    Quantum electrodynamics (QED);    High-intensity pulsed beam;   

DOI  :  

来源: DOAJ

【 摘 要 】

A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state hyperfine structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium hyperfine structure interval of νHFS=4.463302(4)GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.

【 授权许可】

Unknown