Energy Spectrum of Cosmic-Ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station

O Adriani; Y Akaike; K Asano; Y Asaoka; M G Bagliesi; G Bigongiari; W R Binns; S Bonechi; M Bongi; P Brogi; J H Buckley; N Cannady; G Castellini; C Checchia; M L Cherry; G Collazuol; V Di Felice; K Ebisawa; H Fuke; T G Guzik; T Hams; M Hareyama; N Hasebe; K Hibino; M Ichimura; K Ioka; W Ishizaki; M H Israel; A Javaid; K Kasahara; J Kataoka; R Kataoka; Y Katayose; C Kato; N Kawanaka; Y Kawakubo; H S Krawczynski; J F Krizmanic; S Kuramata; T Lomtadze; P Maestro; P S Marrocchesi; A M Messineo; J W Mitchell; S Miyake; K Mizutani; A A Moiseev; K Mori; M Mori; N Mori; H M Motz; K Munakata; H Murakami; S Nakahira; J Nishimura; G A de Nolfo; S Okuno; J F Ormes; S Ozawa; L Pacini; F Palma; P Papini; A V Penacchioni; B F Rauch; S B Ricciarini; K Sakai; T Sakamoto; M Sasaki; Y Shimizu; A Shiomi; R Sparvoli; P Spillantini; F Stolzi; I Takahashi; M Takayanagi; M Takita; T Tamura; N Tateyama; T Terasawa; H Tomida; S Torii; Y Tsunesada; Y Uchihori; S Ueno; E Vannuccini; J P Wefel; K Yamaoka; S Yanagita; A Yoshida; K Yoshida; T Yuda; CALET Collaboration

doi:10.1103/PhysRevLett.119.181101

Energy Spectrum of Cosmic-Ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station

Phys Rev Lett. 2017 Nov 3;119(18):181101. doi: 10.1103/PhysRevLett.119.181101. Epub 2017 Nov 1.

Authors

O Adriani^{1

2}, Y Akaike^{3

4}, K Asano⁵, Y Asaoka^{6

7}, M G Bagliesi^{8

9}, G Bigongiari^{8

9}, W R Binns¹⁰, S Bonechi^{8

9}, M Bongi^{1

2}, P Brogi^{8

9}, J H Buckley¹⁰, N Cannady¹¹, G Castellini¹², C Checchia^{13

14}, M L Cherry¹¹, G Collazuol^{13

14}, V Di Felice^{15

16}, K Ebisawa¹⁷, H Fuke¹⁷, T G Guzik¹¹, T Hams^{3

18}, M Hareyama¹⁹, N Hasebe⁶, K Hibino²⁰, M Ichimura²¹, K Ioka²², W Ishizaki⁵, M H Israel¹⁰, A Javaid¹¹, K Kasahara⁶, J Kataoka⁶, R Kataoka²³, Y Katayose²⁴, C Kato²⁵, N Kawanaka^{26

27}, Y Kawakubo²⁸, H S Krawczynski¹⁰, J F Krizmanic^{3

18}, S Kuramata²¹, T Lomtadze^{9

29}, P Maestro^{8

9}, P S Marrocchesi^{8

9}, A M Messineo^{9

29}, J W Mitchell⁴, S Miyake³⁰, K Mizutani³¹, A A Moiseev^{18

32}, K Mori^{6

17}, M Mori³³, N Mori², H M Motz³⁴, K Munakata²⁵, H Murakami⁶, S Nakahira³⁵, J Nishimura¹⁷, G A de Nolfo³⁶, S Okuno²⁰, J F Ormes³⁷, S Ozawa⁶, L Pacini^{1

2

12}, F Palma^{15

16}, P Papini², A V Penacchioni^{8

38}, B F Rauch¹⁰, S B Ricciarini^{2

12}, K Sakai^{3

18}, T Sakamoto²⁸, M Sasaki^{18

32}, Y Shimizu²⁰, A Shiomi³⁹, R Sparvoli^{15

16}, P Spillantini¹, F Stolzi^{8

9}, I Takahashi⁴⁰, M Takayanagi¹⁷, M Takita⁵, T Tamura²⁰, N Tateyama²⁰, T Terasawa³⁵, H Tomida¹⁷, S Torii^{6

7

41}, Y Tsunesada⁴², Y Uchihori⁴³, S Ueno¹⁷, E Vannuccini², J P Wefel¹¹, K Yamaoka⁴⁴, S Yanagita⁴⁵, A Yoshida²⁸, K Yoshida⁴⁶, T Yuda⁵; CALET Collaboration

Affiliations

¹ Department of Physics, University of Florence, Via Sansone, 1-50019 Sesto, Fiorentino, Italy.
² INFN Sezione di Florence, Via Sansone, 1-50019 Sesto, Fiorentino, Italy.
³ of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA.
⁴ Astroparticle Physics Laboratory, NASA/GSFC, Greenbelt, Maryland 20771, USA.
⁵ Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8582, Japan.
⁶ Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.
⁷ JEM Utilization Center, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan.
⁸ Department of Physical Sciences, Earth and Environment, University of Siena, via Roma 56, 53100 Siena, Italy.
⁹ INFN Sezione di Pisa, Polo Fibonacci, Largo B. Pontecorvo, 3-56127 Pisa, Italy.
¹⁰ Department of Physics, Washington University, One Brookings Drive, St. Louis, Missouri 63130-4899, USA.
¹¹ Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, Louisiana 70803, USA.
¹² Institute of Applied Physics (IFAC), National Research Council (CNR), Via Madonna del Piano, 10, 50019 Sesto, Fiorentino, Italy.
¹³ Department of Physics and Astronomy, University of Padova, Via Marzolo, 8, 35131 Padova, Italy.
¹⁴ INFN Sezione di Padova, Via Marzolo, 8, 35131 Padova, Italy.
¹⁵ University of Rome "Tor Vergata," Via della Ricerca Scientifica 1, 00133 Rome, Italy.
¹⁶ INFN Sezione di Rome "Tor Vergata," Via della Ricerca Scientifica 1, 00133 Rome, Italy.
¹⁷ Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan.
¹⁸ CRESST and Astroparticle Physics Laboratory NASA/GSFC, Greenbelt, Maryland 20771, USA.
¹⁹ St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan.
²⁰ Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa, Yokohama, Kanagawa 221-8686, Japan.
²¹ Faculty of Science and Technology, Graduate School of Science and Technology, Hirosaki University, 3, Bunkyo, Hirosaki, Aomori 036-8561, Japan.
²² Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyo, Kyoto 606-8502, Japan.
²³ National Institute of Polar Research, 10-3, Midori-cho, Tachikawa, Tokyo 190-8518, Japan.
²⁴ Faculty of Engineering, Division of Intelligent Systems Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan.
²⁵ Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.
²⁶ Hakubi Center, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
²⁷ Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.
²⁸ College of Science and Engineering, Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo, Sagamihara, Kanagawa 252-5258, Japan.
²⁹ University of Pisa, Polo Fibonacci, Largo B. Pontecorvo, 3-56127 Pisa, Italy.
³⁰ Department of Electrical and Electronic Systems Engineering, National Institute of Technology, Ibaraki College, 866 Nakane, Hitachinaka, Ibaraki 312-8508, Japan.
³¹ Saitama University, Shimo-Okubo 255, Sakura, Saitama 338-8570, Japan.
³² Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA.
³³ Department of Physical Sciences, College of Science and Engineering, Ritsumeikan University, Shiga 525-8577, Japan.
³⁴ International Center for Science and Engineering Programs, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.
³⁵ RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
³⁶ Heliospheric Physics Laboratory, NASA/GSFC, Greenbelt, Maryland 20771, USA.
³⁷ Department of Physics and Astronomy, University of Denver, Physics Building, Room 211, 2112 East Wesley Avenue, Denver, Colorado 80208-6900, USA.
³⁸ ASI Science Data Center (ASDC), Via del Politecnico snc, 00133 Rome, Italy.
³⁹ College of Industrial Technology, Nihon University, 1-2-1 Izumi, Narashino, Chiba 275-8575, Japan.
⁴⁰ Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8583, Japan.
⁴¹ School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.
⁴² Division of Mathematics and Physics, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585, Japan.
⁴³ National Institutes for Quantum and Radiation Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
⁴⁴ Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan.
⁴⁵ College of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan.
⁴⁶ Department of Electronic Information Systems, Shibaura Institute of Technology, 307 Fukasaku, Minuma, Saitama 337-8570, Japan.

PMID: 29219544
DOI: 10.1103/PhysRevLett.119.181101

Abstract

First results of a cosmic-ray electron and positron spectrum from 10 GeV to 3 TeV is presented based upon observations with the CALET instrument on the International Space Station starting in October, 2015. Nearly a half million electron and positron events are included in the analysis. CALET is an all-calorimetric instrument with total vertical thickness of 30 X_{0} and a fine imaging capability designed to achieve a large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum over 30 GeV can be fit with a single power law with a spectral index of -3.152±0.016 (stat+syst). Possible structure observed above 100 GeV requires further investigation with increased statistics and refined data analysis.