Precise Measurement of Hyperfine Splitting of Positronium Using the Zeeman Effect

Akira Ishida; Ginga Akimoto; Yuichi Sasaki; Taikan Suehara; Toshio Namba; Shoji Asai; Tomio Kobayashi; Haruo Saito; Mitsuhiro Yoshida; Kenichi Tanaka; Akira Yamamoto

doi:10.4028/www.scientific.net/MSF.666.129

Paper Titles

Incorporation of the Magnetic Quenching Effect into the Blob Model of Ps Formation. Finite Sized Ps in a Potential Well
p.109

Positron Annihilation in Undercooled Water and Ice
p.115

Water in Montmorillonites
p.119

Influence of Atmospheric Gases Present in the Pores of MCM-41 on Lifetime of Ortho-Positronium
p.123

Precise Measurement of Hyperfine Splitting of Positronium Using the Zeeman Effect
p.129

New Experiment for the First Direct Measurement of Positronium Hyperfine Splitting with Sub-THz Light
p.133

A New Version of LT Program for Positron Lifetime Spectra Analysis
p.138

Electronic Structure via 1D Electron Momentum Densities
p.142

What Else for Improvement of Reconstructed Densities?
p.147

HomeMaterials Science ForumMaterials Science Forum Vol. 666Precise Measurement of Hyperfine Splitting of...

Precise Measurement of Hyperfine Splitting of Positronium Using the Zeeman Effect

Abstract:

The ground state hyperfine splitting of positronium, , is sensitive to high order corrections of QED. A new calculation up to O( ) has revealed a 3.9 discrepancy between the QED prediction and the experimental results. This discrepancy might either be due to systematic problems in the previous experiments or to contributions beyond the Standard Model. We propose an experiment to measure employing new methods designed to remedy the possible systematic errors which may have affected the previous experiments. Our experiment will provide an independent check of the discrepancy. The prototype run has been performed and a result of = 203.3804 0.0022 (stat., 11 ppm) 0.0081 (sys., 40 ppm) GHz has been obtained. Compensation magnets to obtain O(ppm) magnetic field uniformity has been developed. The final run will start soon and a measurement with a precision of O(ppm) is expected within a few years.

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Periodical:

Materials Science Forum (Volume 666)

Pages:

129-132

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.666.129

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Online since:

December 2010

Authors:

Akira Ishida, Ginga Akimoto, Yuichi Sasaki, Taikan Suehara, Toshio Namba, Shoji Asai, Tomio Kobayashi, Haruo Saito, Mitsuhiro Yoshida, Kenichi Tanaka, Akira Yamamoto

Keywords:

Hyperfine Splitting (HFS), Positronium, Quantum Electrodynamic (QED)

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