Аннотация:The ratios of heavy nuclei from Sulfur (Z=16) to Chromium (Z=24) fluxes to the flux of iron nuclei were measured
recently in the ATIC-2 experiment. These ratios were the decreasing functions of energy from 5 GeV/n to approximately
50 GeV/n as expected. However, an unexpected sharp upturn in the ratios was observed at energy ∼ 50 GeV/n.
In this paper, we revise the data and show that the statistical confidence of the observed upturn in the ATIC data is
99.7% and some additional argumets supporting the phenomenon are presented. A possible cause of the upturn is
discussed and it is demonstrated that it can be partially understood within a model of ‘Closed Galaxy with Bubbles’
(CGB). Some features and problems of the CGB model are discussed.