Physics – Nuclear Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphs..14..368c&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 14, Issue 1, p. 368-372.
Physics
Nuclear Physics
Scientific paper
We present measurements of the depth of maximum for extensive air showers (EAS) produced by cosmic ray nuclei with energies above 1017eV. The air showers were observed using the University of Utah's Fly's Eye detectors operating in stereo mode. Measurements of the atmospheric nitrogen fluorescence light generated by EAS have been used to obtain longitudinal development curves of individual showers and, in particular, the depth of maximum of each shower. The data imply an elongation rate of 89 +/- 6 g cm-2 per decade above 1017eV. The distribution of depths of shower maximum has a mean value of 690 +/- 3 g cm-2 (with an estimated systematic uncertainty of +/- 20 g cm-2) and a width (standard deviation) of 85 +/- 2 g cm-2 for showers with energies above 3 × 1017eV. The tail of the distribution has a logarithmic decrement of λ = 70 +/- 14 g cm-2. Comparisons with predictions for a pure proton and a pure iron flux indicate that the data are not consistent with either.
Cassiday G. L.
Cooper Randall
Corbato S. C.
Dawson Bruce R.
Elbert Jerome W.
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