Peculiar high energy cosmic ray stratospheric event reveals a heavy primary origin particle above the knee region of the cosmic ray spectrum

Details Peculiar high energy cosmic ray stratospheric event reveals a heavy primary origin particle above the knee region of the cosmic ray spectrum Peculiar high energy cosmic ray stratospheric event reveals a heavy primary origin particle above the knee region of the cosmic ray spectrum

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvd..71b3001k&link_type=abstract

Physical Review D, vol. 71, Issue 2, id. 023001

Physics

Nuclear Physics

5

Cosmic-Ray Interactions

Scientific paper

We wish to put forward an explanation for a peculiar cosmic ray event with energy ΣEγ≥2×1015eV detected in 1975 by the balloon borne emulsion chamber experiment performed in the stratosphere, at the altitude ≥30km above sea level. For almost 30 years the event has been described as unusual, invoking new exotic mechanisms or models. In our opinion there is no need for an extraordinary explanation. Contrary to the widespread belief, the event gives us an example of “unrecognized standard physics”. At the same time this event revealed a variety of features which are of considerable interest for cosmic rays, nuclear physics, and astrophysics. Here we show that the observed family is most likely to be a result of a heavy nucleus interaction with an air nucleus. In this case a primary particle would originally have been in the energy region above “the knee” of the cosmic ray spectrum.

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