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A measurement of the cosmic-ray antiproton flux and a search for antihelium
Abstract
Balloon-borne instrument measurements are presented of the cosmic-ray antiproton flux between 130 and 320 MeV, as well as the results of a search for antihelium between 130 and 370 MeV per nuclear. The antiprotons are found to have a spectral shape similar to the protons, down to about 100 MeV. Calculations of the expected flux of these particles under the assumption that they were created by collisions of high-energy cosmic rays with the interstellar gas, using the standard leaky box model for propagation in the Galaxy, predict a flux two orders of magnitude smaller than that observed. The discrepancy between calculation and experiment may be evidence that cosmic-ray protons have passed through more than 5.0 g/sq cm of material during their lifetime. The search for cosmic-ray antihelium sets a 95% confidence level upper limit on the antihelium/helium ratio of 0.000022.
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Citations
Cited by
Bertone, G., & Hooper, D. (2018) · Reviews of Modern Physics · doi:10.1103/revmodphys.90.045002 · Cited by 1,241
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Drukier, A. K., Freese, K., & Spergel, D. N. (1986) · Physical Review D · doi:10.1103/physrevd.33.3495 · Cited by 855
Aguilar, M., Alcaraz, J., Allaby, J., Alpat, B., Ambrosi, G., Anderhub, H., Ao, L., Arefiev, A., Azzarello, P., Babucci, E., et al. (2002) · Physics Reports · doi:10.1016/s0370-1573(02)00013-3 · Cited by 437
Metadata
- Authors
- Buffington, A., Schindler, S. M., & Pennypacker, C. R.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1981-09
- Volume
- 248
- Pages
- 1179
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2080901860
- Cited by
- 201
- References
- 0
- FWCI
- 8.06
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: A measurement of the cosmic-ray antiproton flux and a search for antihelium. https://app.cochat.ai/papers/10.1086/159247
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- Buffington, A., Schindler, S. M., & Pennypacker, C. R. (1981). A measurement of the cosmic-ray antiproton flux and a search for antihelium. The Astrophysical Journal. https://doi.org/10.1086/159247
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