PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Beyond the Standard Model
Laser spectroscopy of long-lived pionic and antiprotonic helium in superfluid helium
M. Hori*, H. Aghai-Khozani, A. Soter, A. Dax, D. Barna and L. Venturelli
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Pre-published on: November 26, 2022
Published on: June 15, 2023
The PiHe collaboration of PSI recently carried out laser spectroscopy of an infrared transition in three-body pionic helium atoms that were synthesized in a superfluid (He-II) helium target. Analogous measurements of antiprotonic helium atoms embedded in liquid helium were carried out by the ASACUSA collaboration of CERN. Spectral lines of unexpectedly narrow, sub-gigahertz linewidth were revealed in the antiproton case. An abrupt reduction in the linewidth was observed when the liquid helium (He-I) surrounding the atom transitioned into the superfluid phase.
DOI: https://doi.org/10.22323/1.414.0141
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