Do we see an 'Iron Peak' ?
21 Apr 2011
1P. N. Lebedev Physical Institute, Moscow, Russia
2Durham University, Durham, UK
Abstract. An update of the fine structure in the cosmic ray (CR) energy spectrum at PeV and tens of PeV energies is presented. The existence of the bump at 50–80 PeV found in the GAMMA experiment is supported by 9 other experiments. If it is a real feature it might indicate the existence of the so called 'Iron Peak', i.e. the end of the contribution of a 'Single Source' to the background of CR from other sources. We argue that the new feature in the fine structure of the CR energy spectrum makes the evidence in favour of the presence of a 'Single Source' stronger than before.