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

2017/12/05 by O. Adriani, Y. Akaike, K. Asano +88 · 1 citation
Physics and Astronomy · #astro-ph.HE

paper · pdf · doi:10.1103/physrevlett.119.181101

published as Physical Review Letters 119, 181101 (2017) · 7 pages, 6 figures, published 1 November 2017 in Physical Review Letters

arxiv created 2017/12/05 · arxiv updated 2017/12/06

Abstract

First results of a cosmic-ray electron + positron spectrum, from 10 GeV to 3 TeV, is presented based upon observations with the CALET instrument on the ISS starting in October, 2015. Nearly a half million electron + positron events are included in the analysis. CALET is an all-calorimetric instrument with total vertical thickness of 30 X₀ 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.

Cited by

• The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years On Orbit

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