NUK - logo
E-viri
Recenzirano Odprti dostop
  • Inferred cosmic-ray spectru...
    Ackermann, M; Ajello, M; Albert, A; Allafort, A; Baldini, L; Bechtol, K; Bellazzini, R; Bonamente, E; Bottacini, E; Brigida, M; Bruel, P; Buehler, R; Caliandro, G A; Caraveo, P A; Cecchi, C; Charles, E; Chaves, R C G; Chiang, J; Chiaro, G; Conrad, J; Cutini, S; Dalton, M; de Angelis, A; de Palma, F; Dermer, C D; Di Venere, L; do Couto e Silva, E; Drell, P S; Drlica-Wagner, A; Favuzzi, C; Focke, W B; Fusco, P; Gasparrini, D; Germani, S; Giglietto, N; Glanzman, T; Gomez-Vargas, G A; Grove, J E; Gustafsson, M; Hanabata, Y; Harding, A K; Hayashida, M; Horan, D; Hou, X; Hughes, R E; Inoue, Y; Jackson, M S; Jogler, T; Johnson, A S; Kawano, T; Knödlseder, J; Kuss, M; Lande, J; Larsson, S; Longo, F; Lovellette, M N; Mayer, M; Mazziotta, M N; McEnery, J E; Mehault, J; Michelson, P F; Mizuno, T; Monte, C; Morselli, A; Moskalenko, I V; Nemmen, R; Nuss, E; Ohsugi, T; Okumura, A; Orlando, E; Ormes, J F; Paneque, D; Panetta, J H; Perkins, J S; Pesce-Rollins, M; Pivato, G; Porter, T A; Rainò, S; Rando, R; Reimer, A; Ritz, S; Roth, M; Schulz, A; Sgrò, C; Siskind, E J; Spandre, G; Spinelli, P; Strong, A W; Takeuchi, Y; Thayer, J G; Tibaldo, L; Tosti, G; Tronconi, V; Usher, T L; Vasileiou, V; Vianello, G; Vitale, V; Winer, B L; Wood, K S; Wood, M

    Physical review letters, 2014-Apr-18, Letnik: 112, Številka: 15
    Journal Article

    Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90  GeV-6  TeV (derived from a photon energy range 15 GeV-1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200  GeV, respectively.