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An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV
Open accessAbstract
Positrons are known to be produced in interactions between cosmic-ray nuclei and interstellar matter ("secondary production"). Positrons may, however, also be created by dark matter particle annihilations in the galactic halo or in the magnetospheres of near-by pulsars. The nature of dark matter is one of the most prominent open questions in science today. An observation of positrons from pulsars would open a new observation window on these sources. Here we present results from the PAMELA satellite experiment on the positron abundance in the cosmic radiation for the energy range 1.5 - 100 GeV. Our high energy data deviate significantly from predictions of secondary production models, and may constitute the first indirect evidence of dark matter particle annihilations, or the first observation of positron production from near-by pulsars. We also present evidence that solar activity significantly affects the abundance of positrons at low energies.
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Cites
Particle dark matter: evidence, candidates and constraints
Bertone, G., Hooper, D., & Silk, J. (2005) · Physics Reports · doi:10.1016/j.physrep.2004.08.031 · Cited by 4,979
Cited by
Bertone, G., & Hooper, D. (2018) · Reviews of Modern Physics · doi:10.1103/revmodphys.90.045002 · Cited by 1,241
Freeze-in production of FIMP dark matter
Hall, L. J., Jedamzik, K., March-Russell, J., & West, S. M. (2010) · Journal of High Energy Physics · doi:10.1007/jhep03(2010)080 · Cited by 1,162
Dark matter self-interactions and small scale structure
Tulin, S., & Yu, H.-B. (2018) · Physics Reports · doi:10.1016/j.physrep.2017.11.004 · Cited by 1,111
The Next-to-Minimal Supersymmetric Standard Model
Ellwanger, U., Hugonie, C., & Teixeira, A. M. (2010) · Physics Reports · doi:10.1016/j.physrep.2010.07.001 · Cited by 992
PAMELA Measurements of Cosmic-Ray Proton and Helium Spectra
Adriani, O., Barbarino, G. C., Bazilevskaya, G. A., Bellotti, R., Boezio, M., Bogomolov, E. A., Bonechi, L., Bongi, M., Bonvicini, V., Borisov, S., et al. (2011) · Science · doi:10.1126/science.1199172 · Cited by 894
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Metadata
- Authors
- Adriani, O., Barbarino, G. C., Bazilevskaya, G. A., Bellotti, R., Boezio, M., Bogomolov, E. A., Bonechi, L., Bongi, M., Bonvicini, V., Bottai, S., Bruno, A., Cafagna, F., Campana, D., Carlson, P., Casolino, M., Castellini, G., De Pascale, M. P., De Rosa, G., De Simone, N., Di Felice, V., Galper, A. M., Grishantseva, L., Hofverberg, P., Koldashov, S. V., Krutkov, S. Y., Kvashnin, A. N., Leonov, A., Malvezzi, V., Marcelli, L., Menn, W., Mikhailov, V. V., Mocchiutti, E., Orsi, S., Osteria, G., Papini, P., Pearce, M., Picozza, P., Ricci, M., Ricciarini, S. B., Simon, M., Sparvoli, R., Spillantini, P., Stozhkov, Y. I., Vacchi, A., Vannuccini, E., Vasilyev, G., Voronov, S. A., Yurkin, Y. T., Zampa, G., Zampa, N., & Zverev, V. G.
- Venue
- Nature
- Published
- 2009-04
- Volume
- 458
- Issue
- 7238
- Pages
- 607-609
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2098710805
- Cited by
- 2,159
- References
- 1
- FWCI
- 173.74
- Type
- journal article
- Language
- en
- Open access
- green
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- Adriani, O., Barbarino, G. C., Bazilevskaya, G. A., Bellotti, R., Boezio, M., Bogomolov, E. A., Bonechi, L., Bongi, M., Bonvicini, V., Bottai, S., Bruno, A., Cafagna, F., Campana, D., Carlson, P., Casolino, M., Castellini, G., De Pascale, M. P., De Rosa, G., De Simone, N., . . . Zverev, V. G. (2009). An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV. Nature. https://doi.org/10.1038/nature07942
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