Abstract
The cosmic-ray energy spectrum above is reported using the updated data set of the Akeno Giant Air Shower Array from February 1990 to October 1997. The energy spectrum extends beyond and the energy gap between the highest energy event and the others is being filled up with recently observed events. The spectral shape suggests the absence of the 2.7 K cutoff in the energy spectrum or a possible presence of a new component beyond the 2.7 K cutoff.
- Received 26 May 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.1163
©1998 American Physical Society