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Detection of a cosmic ray with measured energy well beyond the expected spectral cutoff due to cosmic microwave radiation
Open accessAbstract
We report the detection of a 51-joule (320 +/- 90 EeV) cosmic ray by the Fly's Eye air shower detector in Utah. This is substantially greater than the energy of any previously reported cosmic ray. A Greisen-Zatsepin-Kuz'min cutoff of the energy spectrum (due to pion photoproduction energy losses) should occur below this energy unless the highest energy cosmic rays have traveled less than about 30 Mpc. The error box for the arrival direction in galactic coordinates is centered on b=9.6 deg, l=163.4 deg. The particle cascade reached a maximum size near a depth of 815 g/cm^2 in the atmosphere, a depth which does not uniquely identify the type of primary particle.
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Citations
Cited by
High-energy tests of Lorentz invariance
Coleman, S., & Glashow, S. L. (1999) · Physical Review D · doi:10.1103/physrevd.59.116008 · Cited by 1,149
Dark energy from mass varying neutrinos
Fardon, R., Nelson, A. E., & Weiner, N. (2004) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2004/10/005 · Cited by 414
Amelino-Camelia, G., & Piran, T. (2001) · Physical Review D · doi:10.1103/physrevd.64.036005 · Cited by 375
Clusters of Galaxies as Storage Room for Cosmic Rays
Berezinsky, V. S., Blasi, P., & Ptuskin, V. S. (1997) · The Astrophysical Journal · doi:10.1086/304622 · Cited by 271
Jacobson, T., Liberati, S., & Mattingly, D. (2003) · Physical Review D · doi:10.1103/physrevd.67.124011 · Cited by 240
Metadata
- Authors
- Bird, D. J., Corbato, S. C., Dai, H. Y., Elbert, J. W., Green, K. D., Huang, M. A., Kieda, D. B., Ko, S., Larsen, C. G., Loh, E. C., Luo, M. Z., Salamon, M. H., Smith, J. D., Sokolsky, P., Sommers, P., Tang, J. K. K., & Thomas, S. B.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1995-03
- Volume
- 441
- Pages
- 144
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2171691780
- Cited by
- 535
- References
- 0
- FWCI
- 17.96
- Type
- journal article
- Language
- en
- Open access
- green
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- CoChat. (2026). Citation check: Detection of a cosmic ray with measured energy well beyond the expected spectral cutoff due to cosmic microwave radiation. https://app.cochat.ai/papers/10.1086/175344
- The paper
- Bird, D. J., Corbato, S. C., Dai, H. Y., Elbert, J. W., Green, K. D., Huang, M. A., Kieda, D. B., Ko, S., Larsen, C. G., Loh, E. C., Luo, M. Z., Salamon, M. H., Smith, J. D., Sokolsky, P., Sommers, P., Tang, J. K. K., & Thomas, S. B. (1995). Detection of a cosmic ray with measured energy well beyond the expected spectral cutoff due to cosmic microwave radiation. The Astrophysical Journal. https://doi.org/10.1086/175344
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