Title

Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station

Authors

O. Adriani, University of Florence, INFN Sezione di Florence
Y. Akaike, University of Maryland, Astroparticle Physics Laboratory, NASA/GSFC
K. Asano, Institute for Cosmic Ray Research, The University of Tokyo
Y. Asaoka, Research Institute for Science and Engineering, Waseda University, EM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency
M. G. Bagliesi, University of Siena, INFN Sezione di Pisa, Polo Fibonacci
E. Berti, University of Florence, INFN Sezione di Florence
G. Bigongiari, University of Siena, INFN Sezione di Pisa, Polo Fibonacci
W. R. Binns, Washington University
S. Bonechi, University of Siena, INFN Sezione di Pisa
M. Bongi, University of Florence, INFN Sezione di Florence
P. Brogi, University of Siena, INFN Sezione di Pisa
J. H. Buckley, Washington University
N. Cannady, Louisiana State University
G. Castellini, Institute of Applied Physics (IFAC), National Research Council (CNR)
C. Checchia, University of Padova, INFN Sezione di Padova
M. L. Cherry, Louisiana State University
G. Collazuol, University of Padova, INFN Sezione di Padova
V. Di Felice, University of Rome “Tor Vergata”, INFN Sezione di Rome “Tor Vergata”
K. Ebisawa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
H. Fuke, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
T. G. Guzik, Louisiana State University
T. Hams, University of Maryland, CRESST and Astroparticle Physics Laboratory NASA/GSFC
M. Hareyama, St. Marianna University School of Medicine
N. Hasebe, Research Institute for Science and Engineering, Waseda University
K. Hibino, Kanagawa University
M. Ichimura, Hirosaki University
K. Ioka, Yukawa Institute for Theoretical Physics, Kyoto University
W. Ishizaki, Institute for Cosmic Ray Research, The University of Tokyo
M. H. Israel, Washington University
K. Kasahara, Research Institute for Science and Engineering, Waseda University
J. Kataoka, Research Institute for Science and Engineering, Waseda University
R. Kataoka, National Institute of Polar Research
Y. Katayose, Yokohama National University
C. Kato, Shinshu University
N. Kawanaka, Hakubi Center, Kyoto University
Y. Kawakubo, Aoyama Gakuin University
K. Kohri, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization
H. S. Krawczynski, Washington University
J. F. Krizmanic, CRESST and Astroparticle Physics Laboratory NASA/GSFC, University of Maryland
T. Lomtadze, INFN Sezione di Pisa
P. Maestro, University of Siena, INFN Sezione di Pisa
P. S. Marrocchesi, University of Siena, INFN Sezione di Pisa
A. M. Messineo, University of Pisa, INFN Sezione di Pisa
J. W. Mitchell, Astroparticle Physics Laboratory, NASA/GSFC
S. Miyake, National Institute of Technology, Ibaraki College
A. A. Moiseev, University of Maryland, CRESST and Astroparticle Physics Laboratory NASA/GSFC
K. Mori, Research Institute for Science and Engineering, Waseda University, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
M. Mori, Ritsumeikan University
N. Mori, INFN Sezione di Florence
H. M. Motz, International Center for Science and Engineering Programs, Waseda University
K. Munakata, Shinshu University
H. Murakami, Research Institute for Science and Engineering, Waseda University
S. Nakahira, RIKEN
J. Nishimura, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
G. A. de Nolfo, Heliospheric Physics Laboratory, NASA/GSFC
S. Okuno, Kanagawa University
J. F. Ormes, University of DenverFollow
S. Ozawa, Research Institute for Science and Engineering, Waseda University
L. Pacini, University of Florence, Institute of Applied Physics (IFAC), National Research Council (CNR), INFN Sezione di Florence
F. Palma, University of Rome “Tor Vergata”, INFN Sezione di Rome “Tor Vergata”
P. Papini, INFN Sezione di Florence
A. V. Penacchioni, University of Siena, ASI Science Data Center (ASDC)
B. F. Rauch, Washington University
S. B. Ricciarini, Institute of Applied Physics (IFAC), National Research Council (CNR), INFN Sezione di Florence
K. Sakai, CRESST and Astroparticle Physics Laboratory NASA/GSFC, University of Maryland
T. Sakamoto, Aoyama Gakuin University
M. Sasaki, CRESST and Astroparticle Physics Laboratory NASA/GSFC, University of Maryland
Y. Shimizu, Kanagawa University
A. Shiomi, Nihon University
R. Sparvoli, University of Rome “Tor Vergata”, INFN Sezione di Rome “Tor Vergata”
P. Spillantini, University of Florence
F. Stolzi, University of Siena, INFN Sezione di Pisa
J. E. Suh, University of Siena, INFN Sezione di Pisa
A. Sulaj, University of Siena, INFN Sezione di Pisa
I. Takahashi, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo
M. Takayanagi, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
M. Takita, Institute for Cosmic Ray Research, The University of Tokyo
T. Tamura, Kanagawa University
N. Tateyama, Kanagawa University
T. Terasawa, RIKEN
H. Tomida, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
S. Torii, Research Institute for Science and Engineering, Waseda University, JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, School of Advanced Science and Engineering, Waseda University
Y. Tsunesada, Osaka City University
Y. Uchihori, National Institutes for Quantum and Radiation Science and Technology
S. Ueno, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
E. Vannuccini, INFN Sezione di Florence
J. P. Wefel, Louisiana State University
K. Yamaoka, Nagoya University
S. Yanagita, Ibaraki University
A. Yoshida, Aoyama Gakuin University
K. Yoshida, Shibaura Institute of Technology
CALET Collaboration

Publication Date

6-25-2018

Document Type

Article

Organizational Units

Physics and Astronomy

Keywords

Cosmic ray acceleration, Cosmic ray composition, Spectra, Cosmic ray propagation, Cosmic ray sources, Cosmic rays, Astroparticles, Particle dark matter

Abstract

Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the International Space Station utilizing the data up to November 2017. The analysis uses the full detector acceptance at high energies, approximately doubling the statistics compared to the previous result. CALET is an all-calorimetric instrument with a total thickness of 30 X0 at normal incidence and fine imaging capability, designed to achieve large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum in the region below 1 TeV shows good agreement with Alpha Magnetic Spectrometer (AMS-02) data. In the energy region below ∼300  GeV, CALET’s spectral index is found to be consistent with the AMS-02, Fermi Large Area Telescope (Fermi-LAT), and Dark Matter Particle Explorer (DAMPE), while from 300 to 600 GeV the spectrum is significantly softer than the spectra from the latter two experiments. The absolute flux of CALET is consistent with other experiments at around a few tens of GeV. However, it is lower than those of DAMPE and Fermi-LAT with the difference increasing up to several hundred GeV. The observed energy spectrum above ∼1  TeV suggests a flux suppression consistent within the errors with the results of DAMPE, while CALET does not observe any significant evidence for a narrow spectral feature in the energy region around 1.4 TeV. Our measured all-electron flux, including statistical errors and a detailed breakdown of the systematic errors, is tabulated in the Supplemental Material in order to allow more refined spectral analyses based on our data.

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