Summary
The measurement of meson masses in the cosmic radiation with a slowly expanding wilson chambre indicates mesons of different masses. There are at least two different masses, one between 100m 0 and 200m 0, and the other exceeding 200m 0.
Literatur
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Rüling, J., Steinmaurer, R. Zur Frage der Mesonenmassen. Experientia 2, 108–109 (1946). https://doi.org/10.1007/BF02172570
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DOI: https://doi.org/10.1007/BF02172570