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Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station.
Adriani, O; Akaike, Y; Asano, K; Asaoka, Y; Berti, E; Bigongiari, G; Binns, W R; Bongi, M; Brogi, P; Bruno, A; Buckley, J H; Cannady, N; Castellini, G; Checchia, C; Cherry, M L; Collazuol, G; Ebisawa, K; Ficklin, A W; Fuke, H; Gonzi, S; Guzik, T G; Hams, T; Hibino, K; Ichimura, M; Ioka, K; Ishizaki, W; Israel, M H; Kasahara, K; Kataoka, J; Kataoka, R; Katayose, Y; Kato, C; Kawanaka, N; Kawakubo, Y; Kobayashi, K; Kohri, K; Krawczynski, H S; Krizmanic, J F; Maestro, P; Marrocchesi, P S; Messineo, A M; Mitchell, J W; Miyake, S; Moiseev, A A; Mori, M; Mori, N; Motz, H M; Munakata, K; Nakahira, S; Nishimura, J.
Afiliação
  • Adriani O; Department of Physics, University of Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Akaike Y; INFN Sezione di Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Asano K; Waseda Research Institute for Science and Engineering, Waseda University, 17 Kikuicho, Shinjuku, Tokyo 162-0044, Japan.
  • Asaoka Y; JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan.
  • Berti E; Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8582, Japan.
  • Bigongiari G; Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8582, Japan.
  • Binns WR; Department of Physics, University of Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Bongi M; INFN Sezione di Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Brogi P; Department of Physical Sciences, Earth and Environment, University of Siena, via Roma 56, 53100 Siena, Italy.
  • Bruno A; INFN Sezione di Pisa, Polo Fibonacci, Largo B. Pontecorvo, 3-56127 Pisa, Italy.
  • Buckley JH; Department of Physics and McDonnell Center for the Space Sciences, Washington University, One Brookings Drive, St. Louis, Missouri 63130-4899, USA.
  • Cannady N; Department of Physics, University of Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Castellini G; INFN Sezione di Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Checchia C; Department of Physical Sciences, Earth and Environment, University of Siena, via Roma 56, 53100 Siena, Italy.
  • Cherry ML; INFN Sezione di Pisa, Polo Fibonacci, Largo B. Pontecorvo, 3-56127 Pisa, Italy.
  • Collazuol G; Heliospheric Physics Laboratory, NASA/GSFC, Greenbelt, Maryland 20771, USA.
  • Ebisawa K; Department of Physics and McDonnell Center for the Space Sciences, Washington University, One Brookings Drive, St. Louis, Missouri 63130-4899, USA.
  • Ficklin AW; Center for Space Sciences and Technology, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA.
  • Fuke H; Astroparticle Physics Laboratory, NASA/GSFC, Greenbelt, Maryland 20771, USA.
  • Gonzi S; Center for Research and Exploration in Space Sciences and Technology, NASA/GSFC, Greenbelt, Maryland 20771, USA.
  • Guzik TG; Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Italy.
  • Hams T; Department of Physical Sciences, Earth and Environment, University of Siena, via Roma 56, 53100 Siena, Italy.
  • Hibino K; INFN Sezione di Pisa, Polo Fibonacci, Largo B. Pontecorvo, 3-56127 Pisa, Italy.
  • Ichimura M; Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, Louisiana 70803, USA.
  • Ioka K; Department of Physics and Astronomy, University of Padova, Via Marzolo, 8, 35131 Padova, Italy.
  • Ishizaki W; INFN Sezione di Padova, Via Marzolo, 8, 35131 Padova, Italy.
  • Israel MH; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan.
  • Kasahara K; Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, Louisiana 70803, USA.
  • Kataoka J; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan.
  • Kataoka R; Department of Physics, University of Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Katayose Y; INFN Sezione di Florence, Via Sansone, 1-50019 Sesto Fiorentino, Italy.
  • Kato C; Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, Louisiana 70803, USA.
  • Kawanaka N; Center for Space Sciences and Technology, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA.
  • Kawakubo Y; Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa, Yokohama, Kanagawa 221-8686, Japan.
  • Kobayashi K; Faculty of Science and Technology, Graduate School of Science and Technology, Hirosaki University, 3, Bunkyo, Hirosaki, Aomori 036-8561, Japan.
  • Kohri K; Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.
  • Krawczynski HS; Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8582, Japan.
  • Krizmanic JF; Department of Physics and McDonnell Center for the Space Sciences, Washington University, One Brookings Drive, St. Louis, Missouri 63130-4899, USA.
  • Maestro P; Department of Electronic Information Systems, Shibaura Institute of Technology, 307 Fukasaku, Minuma, Saitama 337-8570, Japan.
  • Marrocchesi PS; School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.
  • Messineo AM; National Institute of Polar Research, 10-3, Midori-cho, Tachikawa, Tokyo 190-8518, Japan.
  • Mitchell JW; Faculty of Engineering, Division of Intelligent Systems Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan.
  • Miyake S; Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.
  • Moiseev AA; Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.
  • Mori M; Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, Louisiana 70803, USA.
  • Mori N; Waseda Research Institute for Science and Engineering, Waseda University, 17 Kikuicho, Shinjuku, Tokyo 162-0044, Japan.
  • Motz HM; JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan.
  • Munakata K; Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
  • Nakahira S; Department of Physics and McDonnell Center for the Space Sciences, Washington University, One Brookings Drive, St. Louis, Missouri 63130-4899, USA.
  • Nishimura J; Astroparticle Physics Laboratory, NASA/GSFC, Greenbelt, Maryland 20771, USA.
Phys Rev Lett ; 129(10): 101102, 2022 Sep 02.
Article em En | MEDLINE | ID: mdl-36112450
ABSTRACT
A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported. The analysis is based on the data collected during ∼6.2 years of smooth operations aboard the International Space Station and covers a broader energy range with respect to the previous proton flux measurement by CALET, with an increase of the available statistics by a factor of ∼2.2. Above a few hundred GeV we confirm our previous observation of a progressive spectral hardening with a higher significance (more than 20 sigma). In the multi-TeV region we observe a second spectral feature with a softening around 10 TeV and a spectral index change from -2.6 to -2.9 consistently, within the errors, with the shape of the spectrum reported by DAMPE. We apply a simultaneous fit of the proton differential spectrum which well reproduces the gradual change of the spectral index encompassing the lower energy power-law regime and the two spectral features observed at higher energies.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article