Evidence for a Primary Cosmic-Ray Particle with Energy 4 × 1021 eV

Details Evidence for a Primary Cosmic-Ray Particle with Energy 4 × 1021 eV Evidence for a Primary Cosmic-Ray Particle with Energy 4 × 1021 eV

Dec 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971phrvl..27.1604s&link_type=abstract

Physical Review Letters, vol. 27, Issue 23, pp. 1604-1607

Physics

16

Scientific paper

We describe the analysis of an extremely energetic air shower produced by a primary cosmic-ray particle of energy 4 × 1021 eV. The arrival direction of this cosmic ray is right ascension 20 h 14.5 min and declination 24°. The directions of 3C409 (radio source) and A P20 15 +/- 28 (pulsar) are inside the uncertainty of the arrival direction. Information on muons and the total number of charged particles in this air shower indicates no drastic change of nuclear interactions from 1017 to 1021 eV.

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