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One example of an unusual particle track has
been recorded in an emulsion chamber exposed to cosmic rays on a balloon
at the atmospheric depth 11.7 g/cm2. The particle arrived at
the chamber with Z/β = 40 ± 2 and β ≥ 0.8. What is
extraordinary with this particle is its arrival zenith angle, 87.4°,
which amounts to a traversed atmospheric thickness ∼ 200 g/cm2.
The anomalous nature of the present track «ET» (exotic track) is
demonstrated through the difficulties in reconciling it with the
explanation that it is due to an ordinary ultra-heavy cosmic-ray nucleus
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