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Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope
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Number of Authors: 1512012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 1, article id 011103Article in journal (Refereed) Published
Abstract [en]

We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeVare consistent with a fraction that is continuing to rise with energy.

Place, publisher, year, edition, pages
2012. Vol. 108, no 1, article id 011103
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Physical Sciences
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URN: urn:nbn:se:su:diva-162437DOI: 10.1103/PhysRevLett.108.011103ISI: 000298928500005PubMedID: 22304252OAI: oai:DiVA.org:su-162437DiVA, id: diva2:1267624
Available from: 2018-12-03 Created: 2018-12-03 Last updated: 2018-12-03Bibliographically approved

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Ajello, M.Baldini, L.Bastieri, D.Berenji, B.Buehler, R.Caraveo, P. A.Conrad, Jan M.Cutini, S.de Angelis, A.de Palma, F.do Couto e Silva, E.Fukazawa, Y.Funk, S.Gargano, F.Gasparrini, D.Giordano, F.Giroletti, M.Johannesson, G.Garde, M. LlenaLoparco, F.Mazziotta, M. N.Morselli, A.Moskalenko, I. V.Okumura, A.Omodei, N.Pesce-Rollins, M.Rando, R.Reimer, A.Reimer, O.Sadrozinski, H. F. -W.Spandre, G.Takahashi, H.Takahashi, T.Tibaldo, L.Torres, D. F.Vianello, G.Yang, ZhaoyuZimmer, Stephan
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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