Laser spectroscopy of pionic helium atoms

Hori M, Aghai-Khozani H, Sótér A, Dax A & Barna D
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Hori, M., Aghai-Khozani, H., Sótér, A., Dax, A., & Barna, D. (2020). Laser spectroscopy of pionic helium atoms. Nature, 581(7806), 37-41. https://doi.org/10.1038/s41586-020-2240-x