Cosmic-ray positron energy spectrum measured by PAMELA

Cosmic-ray positron energy spectrum measured by PAMELA

Precision measurements of the positron component in the cosmic radiation provide important information about the propagation of cosmic rays and the nature of particle sources in our Galaxy. The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux...

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Veröffentlicht in:Physical review letters 2013-08, Vol.111 (8), p.081102-081102, Article 081102
Hauptverfasser: Adriani, O, Barbarino, G C, Bazilevskaya, G A, Bellotti, R, Bianco, A, Boezio, M, Bogomolov, E A, Bongi, M, Bonvicini, V, Bottai, S, Bruno, A, Cafagna, F, Campana, D, Carbone, R, Carlson, P, Casolino, M, Castellini, G, De Donato, C, De Santis, C, De Simone, N, Di Felice, V, Formato, V, Galper, A M, Karelin, A V, Koldashov, S V, Koldobskiy, S A, Krutkov, S Y, Kvashnin, A N, Leonov, A, Malakhov, V, Marcelli, L, Martucci, M, Mayorov, A G, Menn, W, Mergé, M, Mikhailov, V V, Mocchiutti, E, Monaco, A, Mori, N, Munini, R, Osteria, G, Palma, F, Papini, P, Pearce, M, Picozza, P, Pizzolotto, C, Ricci, M, Ricciarini, S B, Rossetto, L, Sarkar, R, Scotti, V, Simon, M, Sparvoli, R, Spillantini, P, Stochaj, S J, Stockton, J C, Stozhkov, Y I, Vacchi, A, Vannuccini, E, Vasilyev, G I, Voronov, S A, Yurkin, Y T, Zampa, G, Zampa, N, Zverev, V G
Format: Artikel
Sprache:eng
Schlagworte:
Earth
Electrons
Fraction
Modulation
Ratio
Solar Minimum
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Zusammenfassung:Precision measurements of the positron component in the cosmic radiation provide important information about the propagation of cosmic rays and the nature of particle sources in our Galaxy. The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux and fraction that extends previously published measurements up to 300 GeV in kinetic energy. The combined measurements of the cosmic-ray positron energy spectrum and fraction provide a unique tool to constrain interpretation models. During the recent solar minimum activity period from July 2006 to December 2009, approximately 24,500 positrons were observed. The results cannot be easily reconciled with purely secondary production, and additional sources of either astrophysical or exotic origin may be required.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/physrevlett.111.081102