A Search for Fine Structure of the Knee in EAS Size Spectra

Details A Search for Fine Structure of the Knee in EAS Size Spectra A Search for Fine Structure of the Knee in EAS Size Spectra

2001-04-17

arxiv.org/abs/astro-ph/0104282v1

Astropart.Phys. 17 (2002) 13-22

Astronomy and Astrophysics

Astrophysics

17 pages, 5 figs.; Astroparticle Physics, in press

Scientific paper

10.1016/S0927-6505(01)00130-X

28 size spectra of extensive air showers from 7 different experiments are analysed consistently. They are fitted by adjusting either 4 or 5 parameters: knee position, power law exponents above and below the knee, overall intensity and, in addition, a parameter describing the smoothness of the bend. The residuals are then normalized to the same knee position and averaged. When 5 parameters are employed no systematic deviation from a single smooth knee is apparent at the 1% level up to a factor of 4 above the knee. At larger shower sizes a moderately significant deviation can be seen whose shape and position are compatible with a second knee caused by iron group nuclei.

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