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New muonic He atom HFS measurements at J-PARC MUSE.

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Title: New muonic He atom HFS measurements at J-PARC MUSE.
Authors: Goto, Yu1 (AUTHOR) ygoto@phi.phys.nagoya-u.ac.jp, Fukumura, Seiso1 (AUTHOR), Strasser, Patrick2,3,4 (AUTHOR), Ino, Takashi2,3 (AUTHOR), Iwai, Ryoto2 (AUTHOR), Kanda, Sohtaro2,3,4 (AUTHOR), Kawamura, Shiori1 (AUTHOR), Kitaguchi, Masaaki1,2,5 (AUTHOR), Nishimura, Shoichiro2,3 (AUTHOR), Oku, Takayuki6,7 (AUTHOR), Okudaira, Takuya1,6 (AUTHOR), Shimizu, Hirohiko M.1,2 (AUTHOR), Shimomura, Koichiro2,3,4 (AUTHOR), Tada, Hiroki1 (AUTHOR), Torii, Hiroyuki A.8 (AUTHOR)
Source: Hyperfine Interactions. Dec2024, Vol. 245 Issue 1, p1-6. 6p.
Subjects: Particles (Nuclear physics), Fine structure (Physics), Helium atom, Physical sciences, Optical pumping, Hyperfine structure, Quantum electrodynamics, Muons
Abstract: Muonic He (μ He) is a hydrogen-like atom composed of a helium atom with one of its electrons replaced by a negative muon. Measurements of the ground-state hyperfine structure (HFS) interval of the μ He atom is a sensitive tool to test the three-body atomic system, bound-state quantum electrodynamics (QED) theory, and determine fundamental constants of the negative muon magnetic moment and mass. It allows a test of the CPT theorem in muons by comparing these constants with positive muons. Precise measurements of the ground-state HFS interval using a microwave magnetic resonance technique are now in progress at J-PARC by the MuSEUM collaboration. Furthermore, a new experimental approach to recover the muon polarization lost during the muon cascade process is being investigated by repolarizing μ He atoms using a spin-exchange optical pumping (SEOP) technique. The first laser repolarization experiment was recently performed. An overview of the different features of these new μ He atom HFS measurements and the latest results are presented. [ABSTRACT FROM AUTHOR]
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Abstract:Muonic He (μ He) is a hydrogen-like atom composed of a helium atom with one of its electrons replaced by a negative muon. Measurements of the ground-state hyperfine structure (HFS) interval of the μ He atom is a sensitive tool to test the three-body atomic system, bound-state quantum electrodynamics (QED) theory, and determine fundamental constants of the negative muon magnetic moment and mass. It allows a test of the CPT theorem in muons by comparing these constants with positive muons. Precise measurements of the ground-state HFS interval using a microwave magnetic resonance technique are now in progress at J-PARC by the MuSEUM collaboration. Furthermore, a new experimental approach to recover the muon polarization lost during the muon cascade process is being investigated by repolarizing μ He atoms using a spin-exchange optical pumping (SEOP) technique. The first laser repolarization experiment was recently performed. An overview of the different features of these new μ He atom HFS measurements and the latest results are presented. [ABSTRACT FROM AUTHOR]
ISSN:03043843
DOI:10.1007/s10751-024-01912-2