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Laser Spectroscopy of Pionic Helium Atoms by Hori, Masaki; Aghai-Khozani, Hossein; Sótér, Anna; Dax, Andreas; Barna, Daniel is a Physics and Astronomy article available to read on EtoBox.

What is Laser Spectroscopy of Pionic Helium Atoms about?

Charged pions are the lightest and longest-lived mesons. Mesonic atoms are formed when an orbital electron in an atom is replaced by a negatively charged meson. Laser spectroscopy of these atoms should permit the mass and other properties of the meson to be determined with high precision and could place upper limits on exotic forces involving mesons (as has been done in other experiments on antiprotons). Determining the mass of the π meson in particular could help to place direct experimental constraints on the mass of the muon antineutrino. However, laser excitations of mesonic atoms have not been previously achieved because of the small number of atoms that can be synthesized and their typically short (less than one picosecond) lifetimes against absorption of the mesons into the nuclei. Metastable pionic helium (πHe) is a hypothetical three-body atom composed of a helium-4 nucleus, an electron and a π occupying a Rydberg state of large principal (n ≈ 16) and orbital angular momentum (l ≈ n - 1) quantum numbers. The πHe atom is predicted to have an anomalously long nanosecond-scale lifetime, which could allow laser spectroscopy to be carried out. Its atomic structure is unique owi

Who reads Laser Spectroscopy of Pionic Helium Atoms?

Author

Hori, Masaki; Aghai-Khozani, Hossein; Sótér, Anna; Dax, Andreas; Barna, Daniel

Publisher

Nature Publishing Group; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc.; Publons; ScienceOpen; Island Press (ISSN 0028-0836)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)