Long-lived pionic helium | Max-Planck-Gesellschaft https://www.mpg.de/14798532/long-lived-pionic-helium
Exotic atoms, in which electrons are replaced by other subatomic particles of the same charge, allow deep insights into the quantum world. After eight years of ongoing research, a group led by Masaki Hori who is a senior physicist at the Max Planck Institute of Quantum Optics in Garching, Germany, now succeeded in a challenging experiment
© Thorsten Naeser, Dennis Luck, MPQ Artistic impression