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

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...

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Veröffentlicht in:	Physical review letters 2017-11, Vol.119 (18), p.181101-181101, Article 181101
Hauptverfasser:	Adriani, O, Akaike, Y, Asano, K, Asaoka, Y, Bagliesi, M G, Bigongiari, G, Binns, W R, Bonechi, S, Bongi, M, Brogi, P, Buckley, J H, Cannady, N, Castellini, G, Checchia, C, Cherry, M L, Collazuol, G, Di Felice, V, Ebisawa, K, Fuke, H, Guzik, T G, Hams, T, Hareyama, M, Hasebe, N, Hibino, K, Ichimura, M, Ioka, K, Ishizaki, W, Israel, M H, Javaid, A, Kasahara, K, Kataoka, J, Kataoka, R, Katayose, Y, Kato, C, Kawanaka, N, Kawakubo, Y, Krawczynski, H S, Krizmanic, J F, Kuramata, S, Lomtadze, T, Maestro, P, Marrocchesi, P S, Messineo, A M, Mitchell, J W, Miyake, S, Mizutani, K, Moiseev, A A, Mori, K, Mori, M, Mori, N, Motz, H M, Munakata, K, Murakami, H, Nakahira, S, Nishimura, J, de Nolfo, G A, Okuno, S, Ormes, J F, Ozawa, S, Pacini, L, Palma, F, Papini, P, Penacchioni, A V, Rauch, B F, Ricciarini, S B, Sakai, K, Sakamoto, T, Sasaki, M, Shimizu, Y, Shiomi, A, Sparvoli, R, Spillantini, P, Stolzi, F, Takahashi, I, Takayanagi, M, Takita, M, Tamura, T, Tateyama, N, Terasawa, T, Tomida, H, Torii, S, Tsunesada, Y, Uchihori, Y, Ueno, S, Vannuccini, E, Wefel, J P, Yamaoka, K, Yanagita, S, Yoshida, A, Yoshida, K, Yuda, T
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Sprache:	eng
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.119.181101