Speaker
Description
The ASACUSA collaboration at CERN's Antiproton Decelerator has carried out laser spectroscopy of metastable antiprotonic helium atoms embedded in superfluid helium targets [1]. These are three-body Coulomb systems composed of a helium nucleus, an electron and an orbital antiproton. An abrupt and unexpected reduction in the linewidth of the antiprotonic laser resonance to sub-Ghz width was observed when the liquid surrounding the atom transitioned into the superfluid phase. In this way, the hyperfine structure arising from the spin–spin interaction between the electron and antiproton was resolved with a relative spectral resolution of $2\times 10^{-6}$. This implies that other helium atoms containing antinuclei, and mesonic atoms formed in superfluid helium, may in the future be studied by laser spectroscopy with a high spectral resolution.
[1] A. Sótér, H. Aghai-Khozani, D. Barna, A. Dax, L. Venturelli, M. Hori, Nature 6ö3, 411 (2022).
Details
Masaki Hori
Imperial College London, United Kingdom
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | ASACUSA, CERN Antiproton Decelerator |
| Is the speaker for that presentation defined? | Yes |
| Internet talk | Yes |
