14-16 September 2015
Castello Angioino, Gallipoli, ITALY
Europe/Rome timezone

The energy interval above the ankle where the cosmic radiation consists only of ultraheavy nuclei from Zinc to the actinides

16 Sep 2015, 15:00
25m
Castello Angioino, Gallipoli, ITALY

Castello Angioino, Gallipoli, ITALY

Cosmic Ray: Theoretical Implications Cosmic Ray: Theoretical Implication

Speaker

antonio codino (university of Perugia and INFN)

Description

According to recent measurements the tendency of the chemical composition above the ankle is characterized by increasing fractions of intermediate and heavy nuclei and a dominance of light nuclei around the ankle featured by a minimum of the log(A) profile. Calculations of the chemical composition in the range 3.5x10**18-5x10**19 eV according to new principles are reported and compared with the experimental data. The calculation outcomes explain both the rising tendency and the minimum of log(A). The estimate is prolonged to the adjacent interval 5x10**19-10**21 eV using the same theoretical background and some features of the cosmic-ray spectrum at the maximum observed energies. It results that above the energy of 6.7x10**20 eV the cosmic radiation consists only of nuclei heavier than Zinc with a rate of (1-5)x10**-34 particles/m2 s sr GeV. The support of the data on this last estimate is debated.

Primary author

antonio codino (university of Perugia and INFN)

Presentation Materials