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Status of the new muonic helium atom HFS measurements at J-PARC MUSE

by Okudaira, T , Tanaka, T , Ino, T , Seo, S , Shimizu, H M , Shimomura, K , Oku, T , Fukumura, S , Yasuda, H , Shimizu, K , Tada, H , Iwai, R , Kitaguchi, M , Yamauchi, H , Strasser, P , Nishimura, S , Torii, H A , Kanda, S , Kawamura, S

in Helium atoms / Hyperfine structure / Magnetic moments / Magnetic properties / Muons / Optical pumping / Particle beams / Physics / Proton accelerators / Quantum electrodynamics

2023

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Status of the new muonic helium atom HFS measurements at J-PARC MUSE

in Helium atoms / Hyperfine structure / Magnetic moments / Magnetic properties / Muons / Optical pumping / Particle beams / Physics / Proton accelerators / Quantum electrodynamics

2023

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Status of the new muonic helium atom HFS measurements at J-PARC MUSE

in Helium atoms / Hyperfine structure / Magnetic moments / Magnetic properties / Muons / Optical pumping / Particle beams / Physics / Proton accelerators / Quantum electrodynamics

2023

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Journal Article

Status of the new muonic helium atom HFS measurements at J-PARC MUSE

Okudaira, T,

Tanaka, T,

Ino, T,

Seo, S,

Shimizu, H M,

Shimomura, K,

Oku, T,

Fukumura, S,

Yasuda, H,

Shimizu, K,

Tada, H,

Iwai, R,

Kitaguchi, M,

Yamauchi, H,

Strasser, P,

Nishimura, S,

Torii, H A,

Kanda, S,

Kawamura, S

2023

Overview

Measurements of the muonic helium atom hyperfine structure (HFS) are a sensitive tool to test the theory of three-body atomic systems and bound-state quantum electrodynamics (QED) and to determine fundamental constants of the negative muon magnetic moment and mass. The world’s most intense pulsed negative muon beam at J-PARC MUSE brings an opportunity to improve previous measurements and test further CPT invariance by comparing the magnetic moments and masses of positive and negative muons. Test measurements at D-line are now in progress utilizing MuSEUM apparatus at zero field. The first results already have better accuracy than previous measurements in the 1980s. Also, the investigation of a new experimental approach to improve HFS measurements by repolarizing muonic helium atoms using a spin-exchange optical pumping (SEOP) technique was started. If successful, this would drastically improve the measurement accuracy.

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Publisher

IOP Publishing

Subject

Helium atoms

/ Hyperfine structure

/ Magnetic moments

/ Magnetic properties

/ Muons

/ Optical pumping

/ Particle beams