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The Cosmic‐Ray Antiproton Flux between 3 and 49 GeV
Open accessAbstract
We report on a new measurement of the cosmic ray antiproton spectrum. The data were collected by the balloon-borne experiment CAPRICE98, which was flown on 1998 May 28-29 from Fort Sumner, New Mexico. The experiment used the NMSU-WiZard/CAPRICE98 balloon-borne magnet spectrometer equipped with a gas Ring Imaging Cherenkov (RICH) detector, a time-of-flight system, a tracking device consisting of drift chambers and a superconducting magnet, and a silicon-tungsten calorimeter. The RICH detector was the first ever flown capable of mass-resolving charge-one particles at energies above 5 GeV. A total of 31 antiprotons with rigidities between 4 and 50 GV at the spectrometer were identified with small backgrounds from other particles. The absolute antiproton energy spectrum was determined in the kinetic energy region at the top of the atmosphere between 3.2 and 49.1 GeV. We found that the observed antiproton spectrum and the antiproton-to-proton ratio are consistent with a pure secondary origin. However, a primary component may not be excluded.
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HAWKING, S. W. (1974) · Nature · doi:10.1038/248030a0 · Cited by 5,669
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Metadata
- Authors
- Boezio, M., Bonvicini, V., Schiavon, P., Vacchi, A., Zampa, N., Bergstrom, D., Carlson, P., Francke, T., Grinstein, S., Suffert, M., Hof, M., Kremer, J., Menn, W., Simon, M., Stephens, S. A., Ambriola, M., Bellotti, R., Cafagna, F., Ciacio, F., Circella, M., De Marzo, C., Finetti, N., Papini, P., Piccardi, S., Spillantini, P., Vannuccini, E., Bartalucci, S., Ricci, M., Casolino, M., De Pascale, M. P., Morselli, A., Picozza, P., Sparvoli, R., Mitchell, J. W., Ormes, J. F., Streitmatter, R. E., Bravar, U., & Stochaj, S. J.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2001-11-10
- Volume
- 561
- Issue
- 2
- Pages
- 787-799
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1942811299
- Cited by
- 190
- References
- 1
- FWCI
- 8.08
- Type
- journal article
- Language
- en
- Open access
- bronze
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