Title

Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station

Authors

O. Adriani, Department of Physics, University of Florence, INFN Sezione di Florence
Y. Akaike, Department of Physics, University of Maryland, Astroparticle Physics Laboratory, NASA/GSFC
K. Asano, Institute for Cosmic Ray Research, The University of Tokyo
Y. Asaoka, Waseda Research Institute for Science and Engineering, Waseda University, JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency
M. G. Bagliesi, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
E. Berti, Department of Physics, University of Florence, INFN Sezione di Florence
G. Bigongiari, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
W. R. Binns, Department of Physics and McDonnell Center for the Space Sciences, Washington University
S. Bonechi, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
M. Bongi, Department of Physics, University of Florence, INFN Sezione di Florence
P. Brogi, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
A. Bruno, Heliospheric Physics Laboratory, NASA/GSFC
J. H. Buckley, Department of Physics and McDonnell Center for the Space Sciences, Washington University
N. Cannady, Department of Physics and Astronomy, Louisiana State University
G. Castellini, Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano
C. Checchia, Department of Physics and Astronomy, University of Padova, INFN Sezione di Padova
M. L. Cherry, Department of Physics and Astronomy, Louisiana State University
G. Collazuol, Department of Physics and Astronomy, University of Padova, INFN Sezione di Padova
V. Di Felice, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, INFN Sezione di Rome
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, Department of Physics and Astronomy, Louisiana State University
T. Hams, Department of Physics, University of Maryland, CRESST and Astroparticle Physics Laboratory NASA/GSFC
N. Hasebe, Waseda Research Institute for Science and Engineering, Waseda University
K. Hibino, Kanagawa University
M. Ichimura, Faculty of Science and Technology, Graduate School of Science and Technology, 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, Department of Physics and McDonnell Center for the Space Sciences, Washington University
K. Kasahara, Waseda Research Institute for Science and Engineering, Waseda University
J. Kataoka, Waseda Research Institute for Science and Engineering, Waseda University
R. Kataoka, National Institute of Polar Research
Y. Katayose, Faculty of Engineering, Division of Intelligent Systems Engineering, Yokohama National University
C. Kato, Faculty of Science, Shinshu University
N. Kawanaka, Hakubi Center, Kyoto University, Department of Astronomy, Graduate School of Science, Kyoto University
Y. Kawakubo, Department of Physics and Astronomy, Louisiana State University, College of Science and Engineering, Department of Physics and Mathematics, Aoyama Gakuin University
K. Kohri, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization
H. S. Krawczynski, Department of Physics and McDonnell Center for the Space Sciences, Washington University
J. F. Krizmanic, CRESST and Astroparticle Physics Laboratory NASA/GSFC, Department of Physics, University of Maryland
T. Lomtadze, INFN Sezione di Pisa
P. Maestro, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
P. S. Marrocchesi, Department of Physical Sciences, Earth and Environment, 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, Department of Electrical and Electronic Systems Engineering, National Institute of Technology, Ibaraki College
A. A. Moiseev, Department of Astronomy, University of Maryland, CRESST and Astroparticle Physics Laboratory NASA/GSFC
K. Mori, Waseda Research Institute for Science and Engineering, Waseda University, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
M. Mori, Department of Physical Sciences, College of Science and Engineering, Ritsumeikan University
N. Mori, INFN Sezione di Florence
H. M. Motz, Faculty of Science and Engineering, Global Center for Science and Engineering, Waseda University
K. Munakata, Faculty of Science, Shinshu University
H. Murakami, Waseda 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, Waseda Research Institute for Science and Engineering, Waseda University
L. Pacini, Department of Physics, University of Florence, Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano, INFN Sezione di Florence
F. Palma, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, INFN Sezione di Rome
P. Papini, INFN Sezione di Florence
A. V. Penacchioni, Department of Physical Sciences, Earth and Environment, University of Siena, ASI Science Data Center (ASDC), Via del Politecnico snc
B. F. Rauch, Department of Physics and McDonnell Center for the Space Sciences, Washington University
S. B. Ricciarini, Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano, INFN Sezione di Florence
K. Sakai, CRESST and Astroparticle Physics Laboratory NASA/GSFC, Department of Physics, University of Maryland
T. Sakamoto, College of Science and Engineering, Department of Physics and Mathematics, Aoyama Gakuin University
M. Sasaki, CRESST and Astroparticle Physics Laboratory NASA/GSFC, Department of Astronomy, University of Maryland
Y. Shimizu, Kanagawa University
A. Shiomi, College of Industrial Technology, Nihon University
R. Sparvoli, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, INFN Sezione di Rome
P. Spillantini, Department of Physics, University of Florence
F. Stolzi, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
J. E. Suh, Department of Physical Sciences, Earth and Environment, University of Siena, INFN Sezione di Pisa
A. Sulaj, Department of Physical Sciences, Earth and Environment, 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
T. Terasawa, RIKEN
H. Tomida, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
S. Torii, Waseda Research Institute for Science and Engineering, Waseda University, School of Advanced Science and Engineering, Waseda University
Y. Tsunesada, Division of Mathematics and Physics, Graduate School of Science, 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, Department of Physics and Astronomy, Louisiana State University
K. Yamaoka, Nagoya University
S. Yanagita, College of Science, Ibaraki University
A. Yoshida, College of Science and Engineering, Department of Physics and Mathematics, Aoyama Gakuin University
K. Yoshida, Department of Electronic Information Systems, Shibaura Institute of Technology
CALET Collaboration

Document Type

Article

Publication Date

5-10-2019

Compass Link

https://du-primo.hosted.exlibrisgroup.com/permalink/f/1jii0mc/TN_cdi_proquest_miscellaneous_2232476215

Organizational Units

College of Natual Science and Mathematics, Physics and Astronomy

Abstract

In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties. The observation period used in this analysis is from October 13, 2015 to August 31, 2018 (1054 days). We have achieved the very wide energy range necessary to carry out measurements of the spectrum from 50 GeV to 10 TeV covering, for the first time in space, with a single instrument the whole energy interval previously investigated in most cases in separate subranges by magnetic spectrometers (BESS-TeV, PAMELA, and AMS-02) and calorimetric instruments (ATIC, CREAM, and NUCLEON). The observed spectrum is consistent with AMS-02 but extends to nearly an order of magnitude higher energy, showing a very smooth transition of the power-law spectral index from −2.81±0.03 (50–500 GeV) neglecting solar modulation effects (or −2.87±0.06 including solar modulation effects in the lower energy region) to −2.56±0.04 (1–10 TeV), thereby confirming the existence of spectral hardening and providing evidence of a deviation from a single power law by more than 3σ.

Publication Statement

Copyright held by author or publisher. User is responsible for all copyright compliance.

This document is currently not available here.

Share

COinS