About the possible signature of pion bose condensation contribution in   the high energy cosmic ray nuclear interactions
  The events of anomalous energy deposit and high number of hadrons in hadron calorimeter, often not accompanied at all, or accompanied by very small EAS of cosmic rays, are observed by means of the complex installation aimed at research of cosmic rays. The data quoted and their analysis point to the real contribution and the essential role of pion Bose condensation in high energy nuclear interactions. The possibility of the existence of such process in the nuclear matter (in the neutron stars and in some kinds of the nuclei) was proposed by A.B.Migdal in 1971. 
T.T. Barnaveli, T.T. Barnaveli Jr, A.P. Chubenko, N.A. Eristavi, N.M.   Nesterova, I.V. Khaldeeva
astro-ph.HE