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O-30 - The Fly's Eye stereo spectrum shows a dip centered at 10^18.5 eV and a flattening above 10^19 eV

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Properties7
type
observation
id
O-30
statement
The stereo Fly's Eye spectrum steepens after 10^17.6 eV (index -3.27 +/- 0.02 over 10^17.6-10^18.5 eV) and flattens after 10^18.5 eV (index -2.71 +/- 0.10 over 10^18.5-10^19.6 eV), forming a dip centered at 10^18.5 eV: 5477 events observed between 10^17.6 and 10^19.6 eV against 5936.3 expected from the overall fit, a 5.96 sigma deficit; above 10^18.5 eV, 281 events against 230 expected (3.4 sigma excess). The monocular data independently show a flattening above 10^19 eV (297 events vs 242.35 expected, 3.5 sigma; chance probability ~2 x 10^-4).
source
S-43 - Bird et al. 1994- Fly's Eye cosmic-ray energy spectrum above 10^17 eV
locator
§4.1, Tables 2-3, Figs. 5-6; §5.3-5.4, Table 5
data_basis
link_state
linked

Akeno, Haverah Park and Yakutsk see qualitatively consistent breaks (Table 5); every group observes a deficit between 10^18 and 10^19 eV relative to a single power law. Systematic offsets in fitted slope between experiments are < 0.2.

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