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

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 $X_0$ 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 $\pm$ 0.016 (stat.+ syst.). Possible structure observed above 100 GeV requires further investigation with increased statistics and refined data analysis.

7 pages, 6 figures, published 1 November 2017 in Physical Review Letters

References in corpus (2)

• Observation of an anomalous positron abundance in the cosmic radiation
• Energy Calibration of CALET Onboard the International Space Station

Cited by in corpus (44)

• Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation
• Dark compact objects: an extensive overview
• Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station
• Status, Challenges and Directions in Indirect Dark Matter Searches
• Galactic factories of cosmic-ray electrons and positrons
• Gamma-ray halos around pulsars as the key to understanding cosmic ray transport in the Galaxy
• Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV$/n$ to 2.2 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• Cosmic-ray database update: ultra-high energy, ultra-heavy, and anti-nuclei cosmic-ray data (CRDB v4.0)
• Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV$/n$ to 2.0 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station
• Implications of Feebly Interacting Dark Sector on Neutron Star Properties and Constraints from GW170817
• Cosmic-ray Boron Flux Measured from 8.4 GeV$/n$ to 3.8 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• Constraining light dark matter upscattered by ultrahigh-energy cosmic rays
• Klein-Nishina effect and the cosmic ray electron spectrum
• Exclusion limits on Dark Matter-Neutrino Scattering Cross-section
• Bounds on boosted dark matter from direct detection: The role of energy-dependent cross sections
• Dark Matter Candidates and Searches
• Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons+Positrons in the TeV Region with CALET on the International Space Station
• Side-On transition radiation detector: a detector prototype for TeV energy scale calibration of calorimeters in space
• Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/n to 240 GeV/n with CALET on the International Space Station
• Development of the photo-diode subsystem for the HERD calorimeter double-readout
• Constraints on cosmic-ray boosted dark matter with realistic cross section
• Implications of a possible TeV break in the cosmic-ray electron and positron flux
• Gamma-ray halos around pulsars: impact on pulsar wind physics and galactic cosmic ray transport
• The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years On Orbit
• Galactic halo bubble magnetic fields and UHECR deflections
• Probing Flavor Structure of Cosmic Ray $e^{\mp }$ Spectrum and Implications for Dark Matter Indirect Searches
• Monte Carlo Study of Electron and Positron Cosmic-Ray Propagation with the CALET Spectrum
• Origin of Cosmic Ray Electrons and Positrons
• Effect of the uncertainty in the hadronic interaction models on the estimation of the sensitivity of the Cherenkov Telescope Array
• A radiatively induced inverse seesaw model with hidden $U(1)$ gauge symmetry
• Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station
• Impact of dark boson mediated feeble interaction between dark matter and hadronic matter on $f$-mode oscillation of neutron stars
• Effects of dark boson mediated feeble interaction between dark matter (DM) and quark matter on $f$-mode oscillation of DM admixed quark stars
• Radiative dark matter and neutrino masses from an alternative $U(1{)}_{B-L}$ gauge symmetry
• Constraining Time Dependent Dark Matter Signals from the Sun
• Measurements of Heavy Cosmic-Ray Nuclei Spectra with CALET on the ISS
• Cosmic-Ray Signatures of Dark Matter from a Flavor Dependent Gauge Symmetry Model with Neutrino Mass Mechanism
• An Unsupervised Machine Learning Method for Electron--Proton Discrimination of the DAMPE Experiment
• Determination of the absolute energy scale of the DAMPE calorimeter with the geomagnetic rigidity cutoff method
• Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS
• Calibration and Status of the 3D Imaging Calorimeter of DAMPE for Cosmic Ray Physics on Orbit
• Anisotropic diffusion modeling of cosmic-ray lepton propagation
• Thermal Leptophilic Light Vector Dark Matter with Spinor Mediator and Muon (g-2) Anomaly