Upturn in the ratio of nuclei of Z=16-24 to iron observed  in the ATIC experiment and the Local Bubble

Авторы: Panov A.D., Sokolskaya N.V., Zatsepin V.I.
Журнал: Nuclear Physics B - Proceedings Supplements
Том: 256
Год издания: 2014
Издательство: North-Holland Publ Co
Местоположение издательства: Netherlands
Первая страница: 233
Последняя страница: 240
DOI: 10.1016/j.nuclphysbps.2014.10.027
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.
Добавил в систему: Сокольская Наталия Владимировна

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