Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976cajph..54..176s&link_type=abstract
Canadian Journal of Physics, vol. 54, Jan. 15, 1976, p. 176-185. Research supported by the National Research Council of Canada.
Physics
1
Cosmic Ray Showers, Muons, Particle Telescopes, Time Lag, Atmospheric Radiation, High Energy Interactions, Particle Energy, Photomultiplier Tubes, Scintillation Counters, Upper Atmosphere
Scientific paper
A large-aperture five-element cosmic-ray telescope was operated in conjunction with an air-shower array in a search for long-lived particles delayed between 1 and 45 microsec after extensive air showers. After sampling around 29,000 air showers with energy greater than 100,000 GeV over a period of 9 months, an excess of 11 such events was observed with time delays of 1 to 6 microsec following the showers. The events in the remainder of the 45-microsec interval were consistent with background random coincidences. It is estimated that only one of the 11 excess events might be attributable to afterpulsing in the telescope photomultiplier tubes. All the excess 'trailing particle' events can be explained as being due to electrons resulting from shower-associated muons that stop and decay in the vicinity of the cosmic-ray telescope.
Smith Gary R.
Standil S.
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