Pions form a new kind of helium – Physics World
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Pionic helium exists for long enough to be zapped by lasers, paving the way for more precise measurements of the pion's mass
Measurement of anti-3He nuclei absorption in matter and impact on
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χ 2 /datum for the fit of the world pp Ay data below 350 MeV
CERN Physicists Create Atoms of Pionic Helium, Physics
Precision measurement of the neutral pion lifetime
Internal structure of the Xi nucleus finally observed
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Cosmic ray - Wikipedia
Written up lectures by P. Franzini
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