Possible structure in the cosmic ray electron spectrum measured by the ATIC-2 and ATIC-4 experiments

Abstract

A strong excess in a form of a wide peak in the energy range of 300-800 GeV\nwas discovered in the first measurements of the electron spectrum in the energy\nrange from 20 GeV to 3 TeV by the balloon-borne experiment ATIC (J. Chang et\nal. Nature, 2008). The experimental data processing and analysis of the\nelectron spectrum with different criteria for selection of electrons,\ncompletely independent of the results reported in (J. Chang et al. Nature,\n2008) is employed in the present paper. The new independent analysis generally\nconfirms the results of (J. Chang et al. Nature, 2008), but shows that the\nspectrum in the region of the excess is represented by a number of narrow\npeaks. The measured spectrum is compared to the spectrum of (J. Chang et al.\nNature, 2008) and to the spectrum of the Fermi/LAT experiment.\n