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ASTRA Proceedings An open-access journal for refereed proceedings in extraterrestrial research
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Articles | Volume 2
ASTRA Proc., 2, 17–20, 2015
ASTRA Proc., 2, 17–20, 2015

  09 Sep 2015

09 Sep 2015

Search for a positron anisotropy with PAMELA experiment

B. Panico1, O. Adriani3,4, G. C. Barbarino1,2, G. A. Bazilevskaya5, R. Bellotti6,7, M. Boezio8, E. A. Bogomolov9, M. Bongi3,4, V. Bonvicini8, S. Bottai4, A. Bruno6, F. Cafagna7, D. Campana1, P. Carlson10, M. Casolino11,12, G. Castellini13, C. De Donato11,14, C. De Santis11,14, N. De Simone11, V. Di Felice11,15, V. Formato8,16, A. M. Galper17, U. Giaccari4,a, A. V. Karelin17, S. V. Koldashov17, S. Koldobskiy17, S. Y. Krutkov9, A. N. Kvashnin5, A. Leonov17, V. Malakhov17, L. Marcelli11,14, M. Martucci14,18, A. G. Mayorov17, W. Menn19, M. Mergé11,14, V. V. Mikhailov17, E. Mocchiutti8, A. Monaco6,7, N. Mori3,4, R. Munini8,16, G. Osteria1, F. Palma11,14, M. Pearce10, P. Picozza11,14, M. Ricci18, S. B. Ricciarini4,13, R. Sarkar8,b, V. Scotti1,2, M. Simon19, R. Sparvoli11,14, P. Spillantini3,4, Y. I. Stozhkov5, A. Vacchi8, E. Vannuccini4, G. I. Vasilyev9, S. A. Voronov17, Y. T. Yurkin17, G. Zampa8, and N. Zampa8 B. Panico et al.
  • 1INFN, Sezione di Napoli, 80126 Naples, Italy
  • 2University of Naples "Federico II", Department of Physics, 80126 Naples, Italy
  • 3University of Florence, 50019 Sesto Fiorentino, Florence, Italy
  • 4INFN, Sezione di Firenze, 50019 Sesto Fiorentino, Florence, Italy
  • 5Lebedev Physical Institute, 119991, Moscow, Russia
  • 6University of Bari, Department of Physics, 70126 Bari, Italy
  • 7INFN, Sezione di Bari, 70126 Bari, Italy
  • 8INFN, Sezione di Trieste, 34149 Trieste, Italy
  • 9Ioffe Physical Technical Institute, 194021 St. Petersburg, Russia
  • 10KTH, Department of Physics, and the Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 10691 Stockholm, Sweden
  • 11INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy
  • 12RIKEN, Advanced Science Institute, Wako-shi, Saitama, Japan
  • 13IFAC, 50019 Sesto Fiorentino, Florence, Italy
  • 14University of Rome Tor Vergata, Department of Physics, 00133 Rome, Italy
  • 15Agenzia Spaziale Italiana (ASI) Science Data Center, Via del Politecnico snc 00133 Rome, Italy
  • 16University of Trieste, Department of Physics, 34147 Trieste, Italy
  • 17National Research Nuclear University MEPhI, 115409 Moscow
  • 18INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044 Frascati, Italy
  • 19Universitat Siegen, Department of Physics, 57068 Siegen, Germany
  • anow at: Universidade Federal do Rio de Janeiro, Instituto de Fisica, Rio de Janeiro, RJ, Brazil
  • bformerly at: INFN, Sezione di Trieste, 34149 Trieste, Italy

Abstract. The PAMELA experiment has been collecting data since 2006; its results indicate a rise in the positron fraction with respect to the sum of electrons and positrons in the cosmic-ray (CR) spectrum above 10 GeV. This excess can be due to additional sources, as SNRs or pulsars, which can lead to an anisotropy in the local CR positron, detectable from current experiments. We report on the analysis on spatial distributions of positron events collected by PAMELA, taking into account also the geomagnetic field effects. No significant deviation from the isotropy has been observed.

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