Trapped antiprotons in the Earth inner radiation belt in PAMELA experiment

Yu T. Yurkin, O. Adriani, G. Barbarino, G. A. Bazilevskaya, R. Bellotti, M. Boezzio, E. A. Bogomolov, L. Bonechi, M. Bongi, V. Bonvicini, S. V. Borisov, S. Bottai, A. Bruno, F. Cafagna, D. Campana, R. Carbone, P. Carlson, M. Casolino, G. Castellini, I. A. DanilchenkoM. P. De Pascale, V. Di Felice, A. M. Galper, V. Gillard, L. A. Grishantseva, G. Jerse, A. V. Karelin, M. D. Kheymits, S. V. Koldashov, S. A. Koldobsky, S. Yu Krutkov, A. N. Kvashnin, A. A. Leonov, A. G. Mayorov, V. V. Malakhov, V. Malvezzi, L. Marcelli, W. Menn, V. V. Mikhailov, E. Mocchiutti, N. Mori, N. V. Nikonov, G. Osteria, P. Papini, M. Pearce, P. Picozza, S. Pizzolotto, M. Ricci, S. B. Ricciarini, M. F. Runtso, M. Simon, N. De Simone, R. Sparvoli, P. Spillantini, Yu I. Stozhkov, A. Vacchi, E. Vannuccini, G. V. Vasiliev, S. A. Voronov, Y. Wu, G. Zampa, N. Zampa, V. G. Zverev

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The existence of trapped antiprotons in the Earth's inner radiation belt has been theoretically predicted, but not observed. We present a procedure for antiproton selection and the observation results from the PAMELA space experiment measurements. The PAMELA magnetic spectrometer ensures reliable identification of particles and charge signs, value determination, and energy measurement, thus enabling us to experimentally establish the existence of antiprotons trapped in the Earth's inner radiation belt.

Original languageEnglish
Pages (from-to)854-856
Number of pages3
JournalBulletin of the Russian Academy of Sciences: Physics
Issue number6
StatePublished - Jun 2011
Externally publishedYes

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CONCLUSIONS Antiprotons trapped by the Earth’s magnetic field in the inner radiation belt were registered for the first time. The relation of the antiproton flux to the proton flux was 10–5, which does not contradict the calculated data in [3] ACKNOWLEDGMENTS The work was supported in part by the Russian Foundation for Basic Research, project nos. 09 02 00394a and 10 02 01301a.


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