Energy Spectra of Abundant Cosmic-ray Nuclei in Sources, According to the ATIC Experiment

Journal Article · Wed Mar 01 04:00:00 EST 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA6041· OSTI ID:22661314

Panov, A. D.; Sokolskaya, N. V.

One of the main results of the ATIC (Advanced Thin Ionization Calorimeter) experiment is a collection of energy spectra of abundant cosmic-ray nuclei: protons, He, C, O, Ne, Mg, Si, and Fe measured in terms of energy per particle in the energy range from 50 GeV to tens of teraelectronvolts. In this paper, the ATIC energy spectra of abundant primary nuclei are back-propagated to the spectra in sources in terms of magnetic rigidity using a leaky-box approximation of three different GALPROP-based diffusion models of propagation that fit the latest B/C data of the AMS-02 experiment. It is shown that the results of a comparison of the slopes of the spectra in sources are weakly model dependent; therefore the differences of spectral indices are reliable data. A regular growth of the steepness of spectra in sources in the range of magnetic rigidity of 50–1350 GV is found for a charge range from helium to iron. This conclusion is statistically reliable with significance better than 3.2 standard deviations. The results are discussed and compared to the data of other modern experiments.

• OSTI ID: 22661314
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 837; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ACCELERATION
APPROXIMATIONS
CARBON
COMPARATIVE EVALUATIONS
COSMIC RADIATION
DIFFUSION
ENERGY SPECTRA
GEV RANGE
HELIUM
IRON
MAGNESIUM
MAGNETIC RIGIDITY
NEON
NUCLEI
OXYGEN
PROTONS
SHOWER COUNTERS
SILICON