Evidence for a High-Energy Cosmic-Ray Spectrum Cutoff
Open Access
- 22 April 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 54 (16), 1875-1877
- https://doi.org/10.1103/physrevlett.54.1875
Abstract
We report a measurement of the ultrahigh-energy cosmic-ray spectrum using an atmospheric fluorescence technique for extensive-air-shower detection. The differential spectrum between 0.1 and 10 EeV (1 EeV = eV) is well fitted by a power law with slope 2.94±0.02. Above 10 EeV evidence is presented for the development of a spectral "bump" followed by a cutoff at 70 EeV.
Keywords
This publication has 8 references indexed in Scilit:
- Ultrahigh-energy cosmic-ray spectrumPhysical Review D, 1985
- Ultra high energy cosmic ray neutrinosPhysics Letters B, 1983
- Angular and energy distributions of charged particles in electron-photon cascades in airJournal of Physics G: Nuclear Physics, 1982
- Radiation from collapsing relativistic stars. III - Second order perturbations of collapse with rotationThe Astrophysical Journal, 1980
- End to the Cosmic-Ray Spectrum?Physical Review Letters, 1966
- Cosmic Background Radiation at 3.2 cm-Support for Cosmic Black-Body RadiationPhysical Review Letters, 1966
- A Measurement of Excess Antenna Temperature at 4080 Mc/s.The Astrophysical Journal, 1965
- Evidence for a Primary Cosmic-Ray Particle with EnergyeVPhysical Review Letters, 1963