Abstract
A large halo event, TADJIKISTAN, observed recently by the Pamir Collaboration, consists of a halo (diameter ∼ 2 cm) and of a large number (∼ 2000) of high-energy showers, distributed over an area of R∼20 cm. The total observed energy in the halo is estimated to be 4.8.10 4 TeV. The characteristics of the event are compared with those of ANDROMEDA, another large event observed by the Chacaltaya Collaboration. The observed attenuation mean free path of hadrons, Λ/λ P = 1.41 -0.32 +0.21 , is compatible with that of pions, indicating that the hadrons in the event are not exotic on average.
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