An all-particle primary energy spectrum in the 3–200 PeV energy range

Abstract

We present all-particle primary cosmic-ray energy spectrum in the 3 · 10 6 − 2 · 10 8 GeV energy range obtained by a multi-parametric event-by-event evaluation of the primary energy. The results are obtained on the basis of an expanded EAS data set detected at mountain level (700 g/cm 2 ) by the GAMMA experiment. The energy evaluation method has been developed using the EAS simulation with the SIBYLL interaction model taking into account the response of GAMMA detectors and reconstruction uncertainties of EAS parameters. Nearly unbiased (< 5%) energy estimations regardless of a primary nuclear mass with an accuracy of about 15−10% in the 3 · 10 6 − 2 · 10 8 GeV energy range respectively are attained.An irregularity ('bump') in the spectrum is observed at primary energies of ∼ 7.4 · 10 7 GeV. This bump exceeds a smooth power-law fit to the data by about 4 standard deviations. Not rejecting stochastic nature of the bump completely, we examined the systematic uncertainties of our methods and conclude that they cannot be responsible for the observed feature.

Results from Tunka-133 (5 years observation) and from the Tunka-HiSCORE prototype

“…There is an agreement between the result of Tunka-133 and the spectra of GAMMA [9], KASCADE-Grande [5] and Ice-TOP [13] in the intermediate energy range 10 16 -10 17 eV. Noticeable in Fig.…”

Tunka Advanced Instrument for cosmic rays and Gamma Astronomy (TAIGA): Status, results and perspectives

“…Above this energy one can notice a single point deflecting from the power law description by about 2 standard deviations. The energy of this point (6.3 · 10 16 eV) coincides with that for a "peak", observed in the GAMMA experiment [22]. Between this point and E 0 = 3 · 10 17 the index is γ = 3.07 ± 0.03.…”

“…In the intermediate energy range 10 16 −10 17 eV, the Tunka-133 spectrum agrees with those measured by GAMMA [22], KASCADE-Grande [21] and Ice-TOP [27]. Noticeably, in Fig.…”

Multiplicity spectrum of muon bundles and primary CR composition in the range 1 – 10000 TeV

“…All particle spectrum. Points -data of direct and EAS experiments [18,[26][27][28][29][30][31]. Solid line -spectrum of used primary model, dotted line -spectrum of background cosmic ray flux.…”