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Casolino, M. Martucci, M. Merge', M. Pearce, M. Ricci, M. Simon, N. De Simone, N. Mori, N. Zampa, PAMELA Collaboration: O. Adriani, P. Carlson, P. Papini, P. Picozza, P. Spillantini, R. Bellotti, R. Carbone, R. Munini, R. Sarkar, R. Sparvoli, S. A. Koldobskiy, S. A. Voronov, S. Bottai, S. B. Ricciarini, S. J. Stochaj, S. V. Koldashov, S. Y. Krutkov, V. Bonvicini, V. Di Felice, V. Formato, V. G. Zverev, V. Malakhov, V. Scotti, V. V. Mikhailov, W. Menn, Y. I. Stozhkov, Y. T. Yurkin","submitted_at":"2013-08-01T09:50:34Z","abstract_excerpt":"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. 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