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

O Adriani,W Ishizaki,T Hams,Y Tsunesada,S Kuramata,C Checchia,T Tamura,Y Uchihori,T Sakamoto,J Kataoka,P Brogi,T Terasawa,Y Katayose,S Nakahira,Y Kawakubo,S Okuno,C Kato,A Yoshida,G Castellini,M Ichimura,K Kasahara,A Javaid,M Bongi,N Cannady,M Takita,S Ozawa,G Bigongiari,N Tateyama,M Mori,S Yanagita,E Vannuccini,G Collazuol,K Hibino,R Sparvoli,Y Asaoka,F Palma,N Mori,P Maestro,M Hareyama,K Munakata,T Lomtadze,K Yamaoka,P Papini,H Fuke,M Takayanagi,K Mizutani,S Ueno,T Yuda,V Di Felice,A Shiomi,H Tomida,Shoji Torii ,J H Buckley ,B F Rauch ,John F Krizmanic ,Nobuyuki Hasebe ,M H Israel ,А А Моисеев ,Jun Nishimura ,H Motz ,M L Cherry ,A V Penacchioni ,Ichiro Takahashi ,Kentaro Asano ,Kazuhiro Sakai ,H Krawczynski ,П Спиллантини ,Norita Kawanaka ,Y Shimizu ,J P Wefel ,M G Bagliesi ,Shoko Miyake ,W R Binns ,A Messineo ,Ken Ebisawa ,T G Guzik ,K Möri ,Misao Sasaki ,Kenji Yoshida ,J W Mitchell ,J F Ormes ,Lorenzo Pacini ,Ryuho Kataoka ,Kunihito Ioka ,Simone Bonechi ,Yosui Akaike ,Hiroyuki Murakami ,P S Marrocchesi ,G A De Nolfo ,S Ricciarini ,Francesco Stolzi

doi:10.1103/physrevlett.119.181101

Abstract

First results of a cosmic-ray electron and positron spectrum from 10GeV to 3TeV 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 30GeV can be fit with a single power law with a spectral index of -3.152±0.016 (stat+syst). Possible structure observed above 100GeV requires further investigation with increased statistics and refined data analysis.

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