Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station

(CALET Collaboration)

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26 Citations (Scopus)

Abstract

Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the International Space Station utilizing the data up to November 2017. The analysis uses the full detector acceptance at high energies, approximately doubling the statistics compared to the previous result. CALET is an all-calorimetric instrument with a total thickness of 30 X0 at normal incidence and fine imaging capability, designed to achieve large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum in the region below 1 TeV shows good agreement with Alpha Magnetic Spectrometer (AMS-02) data. In the energy region below ∼300 GeV, CALET's spectral index is found to be consistent with the AMS-02, Fermi Large Area Telescope (Fermi-LAT), and Dark Matter Particle Explorer (DAMPE), while from 300 to 600 GeV the spectrum is significantly softer than the spectra from the latter two experiments. The absolute flux of CALET is consistent with other experiments at around a few tens of GeV. However, it is lower than those of DAMPE and Fermi-LAT with the difference increasing up to several hundred GeV. The observed energy spectrum above ∼1 TeV suggests a flux suppression consistent within the errors with the results of DAMPE, while CALET does not observe any significant evidence for a narrow spectral feature in the energy region around 1.4 TeV. Our measured all-electron flux, including statistical errors and a detailed breakdown of the systematic errors, is tabulated in the Supplemental Material in order to allow more refined spectral analyses based on our data.

Original languageEnglish
Article number261102
JournalPhysical Review Letters
Volume120
Issue number26
DOIs
Publication statusPublished - 2018 Jun 25

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particle telescopes
International Space Station
cosmic rays
positrons
Alpha Magnetic Spectrometer
dark matter
electrons
energy spectra
energy
telescopes
electron flux
systematic errors
acceptability
rejection
incidence
breakdown
retarding
statistics
protons
detectors

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

@article{f8538a07db3f48549c7a06a95f92f4a7,
title = "Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station",
abstract = "Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the International Space Station utilizing the data up to November 2017. The analysis uses the full detector acceptance at high energies, approximately doubling the statistics compared to the previous result. CALET is an all-calorimetric instrument with a total thickness of 30 X0 at normal incidence and fine imaging capability, designed to achieve large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum in the region below 1 TeV shows good agreement with Alpha Magnetic Spectrometer (AMS-02) data. In the energy region below ∼300 GeV, CALET's spectral index is found to be consistent with the AMS-02, Fermi Large Area Telescope (Fermi-LAT), and Dark Matter Particle Explorer (DAMPE), while from 300 to 600 GeV the spectrum is significantly softer than the spectra from the latter two experiments. The absolute flux of CALET is consistent with other experiments at around a few tens of GeV. However, it is lower than those of DAMPE and Fermi-LAT with the difference increasing up to several hundred GeV. The observed energy spectrum above ∼1 TeV suggests a flux suppression consistent within the errors with the results of DAMPE, while CALET does not observe any significant evidence for a narrow spectral feature in the energy region around 1.4 TeV. Our measured all-electron flux, including statistical errors and a detailed breakdown of the systematic errors, is tabulated in the Supplemental Material in order to allow more refined spectral analyses based on our data.",
author = "{(CALET Collaboration)} and O. Adriani and Y. Akaike and K. Asano and Y. Asaoka and Bagliesi, {M. G.} and E. Berti and G. Bigongiari and Binns, {W. R.} and S. Bonechi and M. Bongi and P. Brogi and Buckley, {J. H.} and N. Cannady and G. Castellini and C. Checchia and Cherry, {M. L.} and G. Collazuol and {Di Felice}, V. and K. Ebisawa and H. Fuke and Guzik, {T. G.} and T. Hams and M. Hareyama and N. Hasebe and K. Hibino and M. Ichimura and K. Ioka and W. Ishizaki and Israel, {M. H.} and K. Kasahara and J. Kataoka and R. Kataoka and Y. Katayose and C. Kato and N. Kawanaka and Y. Kawakubo and K. Kohri and Krawczynski, {H. S.} and Krizmanic, {J. F.} and T. Lomtadze and P. Maestro and Marrocchesi, {P. S.} and Messineo, {A. M.} and Mitchell, {J. W.} and S. Miyake and Moiseev, {A. A.} and K. Mori and M. Mori and N. Mori and Kenji Yoshida",
year = "2018",
month = "6",
day = "25",
doi = "10.1103/PhysRevLett.120.261102",
language = "English",
volume = "120",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "26",

}

TY - JOUR

T1 - Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station

AU - (CALET Collaboration)

AU - Adriani, O.

AU - Akaike, Y.

AU - Asano, K.

AU - Asaoka, Y.

AU - Bagliesi, M. G.

AU - Berti, E.

AU - Bigongiari, G.

AU - Binns, W. R.

AU - Bonechi, S.

AU - Bongi, M.

AU - Brogi, P.

AU - Buckley, J. H.

AU - Cannady, N.

AU - Castellini, G.

AU - Checchia, C.

AU - Cherry, M. L.

AU - Collazuol, G.

AU - Di Felice, V.

AU - Ebisawa, K.

AU - Fuke, H.

AU - Guzik, T. G.

AU - Hams, T.

AU - Hareyama, M.

AU - Hasebe, N.

AU - Hibino, K.

AU - Ichimura, M.

AU - Ioka, K.

AU - Ishizaki, W.

AU - Israel, M. H.

AU - Kasahara, K.

AU - Kataoka, J.

AU - Kataoka, R.

AU - Katayose, Y.

AU - Kato, C.

AU - Kawanaka, N.

AU - Kawakubo, Y.

AU - Kohri, K.

AU - Krawczynski, H. S.

AU - Krizmanic, J. F.

AU - Lomtadze, T.

AU - Maestro, P.

AU - Marrocchesi, P. S.

AU - Messineo, A. M.

AU - Mitchell, J. W.

AU - Miyake, S.

AU - Moiseev, A. A.

AU - Mori, K.

AU - Mori, M.

AU - Mori, N.

AU - Yoshida, Kenji

PY - 2018/6/25

Y1 - 2018/6/25

N2 - Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the International Space Station utilizing the data up to November 2017. The analysis uses the full detector acceptance at high energies, approximately doubling the statistics compared to the previous result. CALET is an all-calorimetric instrument with a total thickness of 30 X0 at normal incidence and fine imaging capability, designed to achieve large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum in the region below 1 TeV shows good agreement with Alpha Magnetic Spectrometer (AMS-02) data. In the energy region below ∼300 GeV, CALET's spectral index is found to be consistent with the AMS-02, Fermi Large Area Telescope (Fermi-LAT), and Dark Matter Particle Explorer (DAMPE), while from 300 to 600 GeV the spectrum is significantly softer than the spectra from the latter two experiments. The absolute flux of CALET is consistent with other experiments at around a few tens of GeV. However, it is lower than those of DAMPE and Fermi-LAT with the difference increasing up to several hundred GeV. The observed energy spectrum above ∼1 TeV suggests a flux suppression consistent within the errors with the results of DAMPE, while CALET does not observe any significant evidence for a narrow spectral feature in the energy region around 1.4 TeV. Our measured all-electron flux, including statistical errors and a detailed breakdown of the systematic errors, is tabulated in the Supplemental Material in order to allow more refined spectral analyses based on our data.

AB - Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the International Space Station utilizing the data up to November 2017. The analysis uses the full detector acceptance at high energies, approximately doubling the statistics compared to the previous result. CALET is an all-calorimetric instrument with a total thickness of 30 X0 at normal incidence and fine imaging capability, designed to achieve large proton rejection and excellent energy resolution well into the TeV energy region. The observed energy spectrum in the region below 1 TeV shows good agreement with Alpha Magnetic Spectrometer (AMS-02) data. In the energy region below ∼300 GeV, CALET's spectral index is found to be consistent with the AMS-02, Fermi Large Area Telescope (Fermi-LAT), and Dark Matter Particle Explorer (DAMPE), while from 300 to 600 GeV the spectrum is significantly softer than the spectra from the latter two experiments. The absolute flux of CALET is consistent with other experiments at around a few tens of GeV. However, it is lower than those of DAMPE and Fermi-LAT with the difference increasing up to several hundred GeV. The observed energy spectrum above ∼1 TeV suggests a flux suppression consistent within the errors with the results of DAMPE, while CALET does not observe any significant evidence for a narrow spectral feature in the energy region around 1.4 TeV. Our measured all-electron flux, including statistical errors and a detailed breakdown of the systematic errors, is tabulated in the Supplemental Material in order to allow more refined spectral analyses based on our data.

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UR - http://www.scopus.com/inward/citedby.url?scp=85049402590&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.120.261102

DO - 10.1103/PhysRevLett.120.261102

M3 - Article

AN - SCOPUS:85049402590

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 26

M1 - 261102

ER -